/util.c
C | 4033 lines | 3289 code | 234 blank | 510 comment | 871 complexity | 726a532a856582a5caa8d63d711efa02 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause, AGPL-3.0, 0BSD, Unlicense
- /**********************************************************************
- util.c -
- $Author$
- created at: Fri Mar 10 17:22:34 JST 1995
- Copyright (C) 1993-2008 Yukihiro Matsumoto
- **********************************************************************/
- #include "ruby/ruby.h"
- #include <ctype.h>
- #include <stdio.h>
- #include <errno.h>
- #include <math.h>
- #include <float.h>
- #ifdef _WIN32
- #include "missing/file.h"
- #endif
- #include "ruby/util.h"
- unsigned long
- ruby_scan_oct(const char *start, size_t len, size_t *retlen)
- {
- register const char *s = start;
- register unsigned long retval = 0;
- while (len-- && *s >= '0' && *s <= '7') {
- retval <<= 3;
- retval |= *s++ - '0';
- }
- *retlen = (int)(s - start); /* less than len */
- return retval;
- }
- unsigned long
- ruby_scan_hex(const char *start, size_t len, size_t *retlen)
- {
- static const char hexdigit[] = "0123456789abcdef0123456789ABCDEF";
- register const char *s = start;
- register unsigned long retval = 0;
- const char *tmp;
- while (len-- && *s && (tmp = strchr(hexdigit, *s))) {
- retval <<= 4;
- retval |= (tmp - hexdigit) & 15;
- s++;
- }
- *retlen = (int)(s - start); /* less than len */
- return retval;
- }
- static unsigned long
- scan_digits(const char *str, int base, size_t *retlen, int *overflow)
- {
- static signed char table[] = {
- /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
- /*0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*1*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*2*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*3*/ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
- /*4*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
- /*5*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
- /*6*/ -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
- /*7*/ 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
- /*8*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*9*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*a*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*b*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*c*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*d*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*e*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- /*f*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
- };
- const char *start = str;
- unsigned long ret = 0, x;
- unsigned long mul_overflow = (~(unsigned long)0) / base;
- int c;
- *overflow = 0;
- while ((c = (unsigned char)*str++) != '\0') {
- int d = table[c];
- if (d == -1 || base <= d) {
- *retlen = (str-1) - start;
- return ret;
- }
- if (mul_overflow < ret)
- *overflow = 1;
- ret *= base;
- x = ret;
- ret += d;
- if (ret < x)
- *overflow = 1;
- }
- *retlen = (str-1) - start;
- return ret;
- }
- unsigned long
- ruby_strtoul(const char *str, char **endptr, int base)
- {
- int c, b, overflow;
- int sign = 0;
- size_t len;
- unsigned long ret;
- const char *subject_found = str;
- if (base == 1 || 36 < base) {
- errno = EINVAL;
- return 0;
- }
- while ((c = *str) && ISSPACE(c))
- str++;
- if (c == '+') {
- sign = 1;
- str++;
- }
- else if (c == '-') {
- sign = -1;
- str++;
- }
- if (str[0] == '0') {
- subject_found = str+1;
- if (base == 0 || base == 16) {
- if (str[1] == 'x' || str[1] == 'X') {
- b = 16;
- str += 2;
- }
- else {
- b = base == 0 ? 8 : 16;
- str++;
- }
- }
- else {
- b = base;
- str++;
- }
- }
- else {
- b = base == 0 ? 10 : base;
- }
- ret = scan_digits(str, b, &len, &overflow);
- if (0 < len)
- subject_found = str+len;
- if (endptr)
- *endptr = (char*)subject_found;
- if (overflow) {
- errno = ERANGE;
- return ULONG_MAX;
- }
- if (sign < 0) {
- ret = (unsigned long)(-(long)ret);
- return ret;
- }
- else {
- return ret;
- }
- }
- #include <sys/types.h>
- #include <sys/stat.h>
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #if defined(HAVE_FCNTL_H)
- #include <fcntl.h>
- #endif
- #ifndef S_ISDIR
- # define S_ISDIR(m) ((m & S_IFMT) == S_IFDIR)
- #endif
- #if defined(__CYGWIN32__) || defined(_WIN32)
- /*
- * Copyright (c) 1993, Intergraph Corporation
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Artistic License, as specified in the perl README file.
- *
- * Various Unix compatibility functions and NT specific functions.
- *
- * Some of this code was derived from the MSDOS port(s) and the OS/2 port.
- *
- */
- /*
- * Suffix appending for in-place editing under MS-DOS and OS/2 (and now NT!).
- *
- * Here are the rules:
- *
- * Style 0: Append the suffix exactly as standard perl would do it.
- * If the filesystem groks it, use it. (HPFS will always
- * grok it. So will NTFS. FAT will rarely accept it.)
- *
- * Style 1: The suffix begins with a '.'. The extension is replaced.
- * If the name matches the original name, use the fallback method.
- *
- * Style 2: The suffix is a single character, not a '.'. Try to add the
- * suffix to the following places, using the first one that works.
- * [1] Append to extension.
- * [2] Append to filename,
- * [3] Replace end of extension,
- * [4] Replace end of filename.
- * If the name matches the original name, use the fallback method.
- *
- * Style 3: Any other case: Ignore the suffix completely and use the
- * fallback method.
- *
- * Fallback method: Change the extension to ".$$$". If that matches the
- * original name, then change the extension to ".~~~".
- *
- * If filename is more than 1000 characters long, we die a horrible
- * death. Sorry.
- *
- * The filename restriction is a cheat so that we can use buf[] to store
- * assorted temporary goo.
- *
- * Examples, assuming style 0 failed.
- *
- * suffix = ".bak" (style 1)
- * foo.bar => foo.bak
- * foo.bak => foo.$$$ (fallback)
- * makefile => makefile.bak
- * suffix = ".$$$" (style 1)
- * foo.$$$ => foo.~~~ (fallback)
- *
- * suffix = "~" (style 2)
- * foo.c => foo.c~
- * foo.c~ => foo.c~~
- * foo.c~~ => foo~.c~~
- * foo~.c~~ => foo~~.c~~
- * foo~~~~~.c~~ => foo~~~~~.$$$ (fallback)
- *
- * foo.pas => foo~.pas
- * makefile => makefile.~
- * longname.fil => longname.fi~
- * longname.fi~ => longnam~.fi~
- * longnam~.fi~ => longnam~.$$$
- *
- */
- static int valid_filename(const char *s);
- static const char suffix1[] = ".$$$";
- static const char suffix2[] = ".~~~";
- #define strEQ(s1,s2) (strcmp(s1,s2) == 0)
- extern const char *ruby_find_basename(const char *, long *, long *);
- extern const char *ruby_find_extname(const char *, long *);
- void
- ruby_add_suffix(VALUE str, const char *suffix)
- {
- long baselen;
- long extlen = strlen(suffix);
- long slen;
- char buf[1024];
- const char *name;
- const char *ext;
- long len;
- name = StringValueCStr(str);
- slen = strlen(name);
- if (slen > (long)(sizeof(buf) - 1))
- rb_fatal("Cannot do inplace edit on long filename (%ld characters)",
- slen);
- /* Style 0 */
- rb_str_cat(str, suffix, extlen);
- if (valid_filename(RSTRING_PTR(str))) return;
- /* Fooey, style 0 failed. Fix str before continuing. */
- rb_str_resize(str, slen);
- name = StringValueCStr(str);
- ext = ruby_find_extname(name, &len);
- if (*suffix == '.') { /* Style 1 */
- if (ext) {
- if (strEQ(ext, suffix)) {
- extlen = sizeof(suffix1) - 1; /* suffix2 must be same length */
- suffix = strEQ(suffix, suffix1) ? suffix2 : suffix1;
- }
- slen = ext - name;
- }
- rb_str_resize(str, slen);
- rb_str_cat(str, suffix, extlen);
- }
- else {
- char *p = buf, *q;
- strncpy(buf, name, slen);
- if (ext)
- p += (ext - name);
- else
- p += slen;
- p[len] = '\0';
- if (suffix[1] == '\0') { /* Style 2 */
- q = (char *)ruby_find_basename(buf, &baselen, 0);
- if (len <= 3) {
- if (len == 0 && baselen >= 8 && p + 3 <= buf + sizeof(buf)) p[len++] = '.'; /* DOSISH */
- p[len] = *suffix;
- p[++len] = '\0';
- }
- else if (q && baselen < 8) {
- q += baselen;
- *q++ = *suffix;
- if (ext) {
- strncpy(q, ext, ext - name);
- q[ext - name + 1] = '\0';
- }
- else
- *q = '\0';
- }
- else if (len == 4 && p[3] != *suffix)
- p[3] = *suffix;
- else if (baselen == 8 && q[7] != *suffix)
- q[7] = *suffix;
- else
- goto fallback;
- }
- else { /* Style 3: Panic */
- fallback:
- (void)memcpy(p, !ext || strEQ(ext, suffix1) ? suffix2 : suffix1, 5);
- }
- rb_str_resize(str, strlen(buf));
- memcpy(RSTRING_PTR(str), buf, RSTRING_LEN(str));
- }
- }
- static int
- valid_filename(const char *s)
- {
- int fd;
- /*
- // It doesn't exist, so see if we can open it.
- */
- if ((fd = open(s, O_CREAT|O_EXCL, 0666)) >= 0) {
- close(fd);
- unlink(s); /* don't leave it laying around */
- return 1;
- }
- else if (errno == EEXIST) {
- /* if the file exists, then it's a valid filename! */
- return 1;
- }
- return 0;
- }
- #endif
- /* mm.c */
- #define A ((int*)a)
- #define B ((int*)b)
- #define C ((int*)c)
- #define D ((int*)d)
- #define mmprepare(base, size) do {\
- if (((long)base & (0x3)) == 0)\
- if (size >= 16) mmkind = 1;\
- else mmkind = 0;\
- else mmkind = -1;\
- high = (size & (~0xf));\
- low = (size & 0x0c);\
- } while (0)\
- #define mmarg mmkind, size, high, low
- static void mmswap_(register char *a, register char *b, int mmkind, size_t size, size_t high, size_t low)
- {
- register int s;
- if (a == b) return;
- if (mmkind >= 0) {
- if (mmkind > 0) {
- register char *t = a + high;
- do {
- s = A[0]; A[0] = B[0]; B[0] = s;
- s = A[1]; A[1] = B[1]; B[1] = s;
- s = A[2]; A[2] = B[2]; B[2] = s;
- s = A[3]; A[3] = B[3]; B[3] = s; a += 16; b += 16;
- } while (a < t);
- }
- if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = s;
- if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = s;
- if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = s;}}}
- }
- else {
- register char *t = a + size;
- do {s = *a; *a++ = *b; *b++ = s;} while (a < t);
- }
- }
- #define mmswap(a,b) mmswap_((a),(b),mmarg)
- static void mmrot3_(register char *a, register char *b, register char *c, int mmkind, size_t size, size_t high, size_t low)
- {
- register int s;
- if (mmkind >= 0) {
- if (mmkind > 0) {
- register char *t = a + high;
- do {
- s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
- s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
- s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;
- s = A[3]; A[3] = B[3]; B[3] = C[3]; C[3] = s; a += 16; b += 16; c += 16;
- } while (a < t);
- }
- if (low != 0) { s = A[0]; A[0] = B[0]; B[0] = C[0]; C[0] = s;
- if (low >= 8) { s = A[1]; A[1] = B[1]; B[1] = C[1]; C[1] = s;
- if (low == 12) {s = A[2]; A[2] = B[2]; B[2] = C[2]; C[2] = s;}}}
- }
- else {
- register char *t = a + size;
- do {s = *a; *a++ = *b; *b++ = *c; *c++ = s;} while (a < t);
- }
- }
- #define mmrot3(a,b,c) mmrot3_((a),(b),(c),mmarg)
- /* qs6.c */
- /*****************************************************/
- /* */
- /* qs6 (Quick sort function) */
- /* */
- /* by Tomoyuki Kawamura 1995.4.21 */
- /* kawamura@tokuyama.ac.jp */
- /*****************************************************/
- typedef struct { char *LL, *RR; } stack_node; /* Stack structure for L,l,R,r */
- #define PUSH(ll,rr) do { top->LL = (ll); top->RR = (rr); ++top; } while (0) /* Push L,l,R,r */
- #define POP(ll,rr) do { --top; ll = top->LL; rr = top->RR; } while (0) /* Pop L,l,R,r */
- #define med3(a,b,c) ((*cmp)(a,b,d)<0 ? \
- ((*cmp)(b,c,d)<0 ? b : ((*cmp)(a,c,d)<0 ? c : a)) : \
- ((*cmp)(b,c,d)>0 ? b : ((*cmp)(a,c,d)<0 ? a : c)))
- void
- ruby_qsort(void* base, const size_t nel, const size_t size,
- int (*cmp)(const void*, const void*, void*), void *d)
- {
- register char *l, *r, *m; /* l,r:left,right group m:median point */
- register int t, eq_l, eq_r; /* eq_l: all items in left group are equal to S */
- char *L = base; /* left end of current region */
- char *R = (char*)base + size*(nel-1); /* right end of current region */
- size_t chklim = 63; /* threshold of ordering element check */
- stack_node stack[32], *top = stack; /* 32 is enough for 32bit CPU */
- int mmkind;
- size_t high, low, n;
- if (nel <= 1) return; /* need not to sort */
- mmprepare(base, size);
- goto start;
- nxt:
- if (stack == top) return; /* return if stack is empty */
- POP(L,R);
- for (;;) {
- start:
- if (L + size == R) { /* 2 elements */
- if ((*cmp)(L,R,d) > 0) mmswap(L,R); goto nxt;
- }
- l = L; r = R;
- n = (r - l + size) / size; /* number of elements */
- m = l + size * (n >> 1); /* calculate median value */
- if (n >= 60) {
- register char *m1;
- register char *m3;
- if (n >= 200) {
- n = size*(n>>3); /* number of bytes in splitting 8 */
- {
- register char *p1 = l + n;
- register char *p2 = p1 + n;
- register char *p3 = p2 + n;
- m1 = med3(p1, p2, p3);
- p1 = m + n;
- p2 = p1 + n;
- p3 = p2 + n;
- m3 = med3(p1, p2, p3);
- }
- }
- else {
- n = size*(n>>2); /* number of bytes in splitting 4 */
- m1 = l + n;
- m3 = m + n;
- }
- m = med3(m1, m, m3);
- }
- if ((t = (*cmp)(l,m,d)) < 0) { /*3-5-?*/
- if ((t = (*cmp)(m,r,d)) < 0) { /*3-5-7*/
- if (chklim && nel >= chklim) { /* check if already ascending order */
- char *p;
- chklim = 0;
- for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) > 0) goto fail;
- goto nxt;
- }
- fail: goto loopA; /*3-5-7*/
- }
- if (t > 0) {
- if ((*cmp)(l,r,d) <= 0) {mmswap(m,r); goto loopA;} /*3-5-4*/
- mmrot3(r,m,l); goto loopA; /*3-5-2*/
- }
- goto loopB; /*3-5-5*/
- }
- if (t > 0) { /*7-5-?*/
- if ((t = (*cmp)(m,r,d)) > 0) { /*7-5-3*/
- if (chklim && nel >= chklim) { /* check if already ascending order */
- char *p;
- chklim = 0;
- for (p=l; p<r; p+=size) if ((*cmp)(p,p+size,d) < 0) goto fail2;
- while (l<r) {mmswap(l,r); l+=size; r-=size;} /* reverse region */
- goto nxt;
- }
- fail2: mmswap(l,r); goto loopA; /*7-5-3*/
- }
- if (t < 0) {
- if ((*cmp)(l,r,d) <= 0) {mmswap(l,m); goto loopB;} /*7-5-8*/
- mmrot3(l,m,r); goto loopA; /*7-5-6*/
- }
- mmswap(l,r); goto loopA; /*7-5-5*/
- }
- if ((t = (*cmp)(m,r,d)) < 0) {goto loopA;} /*5-5-7*/
- if (t > 0) {mmswap(l,r); goto loopB;} /*5-5-3*/
- /* determining splitting type in case 5-5-5 */ /*5-5-5*/
- for (;;) {
- if ((l += size) == r) goto nxt; /*5-5-5*/
- if (l == m) continue;
- if ((t = (*cmp)(l,m,d)) > 0) {mmswap(l,r); l = L; goto loopA;}/*575-5*/
- if (t < 0) {mmswap(L,l); l = L; goto loopB;} /*535-5*/
- }
- loopA: eq_l = 1; eq_r = 1; /* splitting type A */ /* left <= median < right */
- for (;;) {
- for (;;) {
- if ((l += size) == r)
- {l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
- if (l == m) continue;
- if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
- if (t < 0) eq_l = 0;
- }
- for (;;) {
- if (l == (r -= size))
- {l -= size; if (l != m) mmswap(m,l); l -= size; goto fin;}
- if (r == m) {m = l; break;}
- if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
- if (t == 0) break;
- }
- mmswap(l,r); /* swap left and right */
- }
- loopB: eq_l = 1; eq_r = 1; /* splitting type B */ /* left < median <= right */
- for (;;) {
- for (;;) {
- if (l == (r -= size))
- {r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
- if (r == m) continue;
- if ((t = (*cmp)(r,m,d)) < 0) {eq_l = 0; break;}
- if (t > 0) eq_r = 0;
- }
- for (;;) {
- if ((l += size) == r)
- {r += size; if (r != m) mmswap(r,m); r += size; goto fin;}
- if (l == m) {m = r; break;}
- if ((t = (*cmp)(l,m,d)) > 0) {eq_r = 0; break;}
- if (t == 0) break;
- }
- mmswap(l,r); /* swap left and right */
- }
- fin:
- if (eq_l == 0) /* need to sort left side */
- if (eq_r == 0) /* need to sort right side */
- if (l-L < R-r) {PUSH(r,R); R = l;} /* sort left side first */
- else {PUSH(L,l); L = r;} /* sort right side first */
- else R = l; /* need to sort left side only */
- else if (eq_r == 0) L = r; /* need to sort right side only */
- else goto nxt; /* need not to sort both sides */
- }
- }
- char *
- ruby_strdup(const char *str)
- {
- char *tmp;
- size_t len = strlen(str) + 1;
- tmp = xmalloc(len);
- memcpy(tmp, str, len);
- return tmp;
- }
- char *
- ruby_getcwd(void)
- {
- #ifdef HAVE_GETCWD
- int size = 200;
- char *buf = xmalloc(size);
- while (!getcwd(buf, size)) {
- if (errno != ERANGE) {
- xfree(buf);
- rb_sys_fail("getcwd");
- }
- size *= 2;
- buf = xrealloc(buf, size);
- }
- #else
- # ifndef PATH_MAX
- # define PATH_MAX 8192
- # endif
- char *buf = xmalloc(PATH_MAX+1);
- if (!getwd(buf)) {
- xfree(buf);
- rb_sys_fail("getwd");
- }
- #endif
- return buf;
- }
- /****************************************************************
- *
- * The author of this software is David M. Gay.
- *
- * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose without fee is hereby granted, provided that this entire notice
- * is included in all copies of any software which is or includes a copy
- * or modification of this software and in all copies of the supporting
- * documentation for such software.
- *
- * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTY. IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
- * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
- * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
- *
- ***************************************************************/
- /* Please send bug reports to David M. Gay (dmg at acm dot org,
- * with " at " changed at "@" and " dot " changed to "."). */
- /* On a machine with IEEE extended-precision registers, it is
- * necessary to specify double-precision (53-bit) rounding precision
- * before invoking strtod or dtoa. If the machine uses (the equivalent
- * of) Intel 80x87 arithmetic, the call
- * _control87(PC_53, MCW_PC);
- * does this with many compilers. Whether this or another call is
- * appropriate depends on the compiler; for this to work, it may be
- * necessary to #include "float.h" or another system-dependent header
- * file.
- */
- /* strtod for IEEE-, VAX-, and IBM-arithmetic machines.
- *
- * This strtod returns a nearest machine number to the input decimal
- * string (or sets errno to ERANGE). With IEEE arithmetic, ties are
- * broken by the IEEE round-even rule. Otherwise ties are broken by
- * biased rounding (add half and chop).
- *
- * Inspired loosely by William D. Clinger's paper "How to Read Floating
- * Point Numbers Accurately" [Proc. ACM SIGPLAN '90, pp. 92-101].
- *
- * Modifications:
- *
- * 1. We only require IEEE, IBM, or VAX double-precision
- * arithmetic (not IEEE double-extended).
- * 2. We get by with floating-point arithmetic in a case that
- * Clinger missed -- when we're computing d * 10^n
- * for a small integer d and the integer n is not too
- * much larger than 22 (the maximum integer k for which
- * we can represent 10^k exactly), we may be able to
- * compute (d*10^k) * 10^(e-k) with just one roundoff.
- * 3. Rather than a bit-at-a-time adjustment of the binary
- * result in the hard case, we use floating-point
- * arithmetic to determine the adjustment to within
- * one bit; only in really hard cases do we need to
- * compute a second residual.
- * 4. Because of 3., we don't need a large table of powers of 10
- * for ten-to-e (just some small tables, e.g. of 10^k
- * for 0 <= k <= 22).
- */
- /*
- * #define IEEE_LITTLE_ENDIAN for IEEE-arithmetic machines where the least
- * significant byte has the lowest address.
- * #define IEEE_BIG_ENDIAN for IEEE-arithmetic machines where the most
- * significant byte has the lowest address.
- * #define Long int on machines with 32-bit ints and 64-bit longs.
- * #define IBM for IBM mainframe-style floating-point arithmetic.
- * #define VAX for VAX-style floating-point arithmetic (D_floating).
- * #define No_leftright to omit left-right logic in fast floating-point
- * computation of dtoa.
- * #define Honor_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3
- * and strtod and dtoa should round accordingly.
- * #define Check_FLT_ROUNDS if FLT_ROUNDS can assume the values 2 or 3
- * and Honor_FLT_ROUNDS is not #defined.
- * #define RND_PRODQUOT to use rnd_prod and rnd_quot (assembly routines
- * that use extended-precision instructions to compute rounded
- * products and quotients) with IBM.
- * #define ROUND_BIASED for IEEE-format with biased rounding.
- * #define Inaccurate_Divide for IEEE-format with correctly rounded
- * products but inaccurate quotients, e.g., for Intel i860.
- * #define NO_LONG_LONG on machines that do not have a "long long"
- * integer type (of >= 64 bits). On such machines, you can
- * #define Just_16 to store 16 bits per 32-bit Long when doing
- * high-precision integer arithmetic. Whether this speeds things
- * up or slows things down depends on the machine and the number
- * being converted. If long long is available and the name is
- * something other than "long long", #define Llong to be the name,
- * and if "unsigned Llong" does not work as an unsigned version of
- * Llong, #define #ULLong to be the corresponding unsigned type.
- * #define KR_headers for old-style C function headers.
- * #define Bad_float_h if your system lacks a float.h or if it does not
- * define some or all of DBL_DIG, DBL_MAX_10_EXP, DBL_MAX_EXP,
- * FLT_RADIX, FLT_ROUNDS, and DBL_MAX.
- * #define MALLOC your_malloc, where your_malloc(n) acts like malloc(n)
- * if memory is available and otherwise does something you deem
- * appropriate. If MALLOC is undefined, malloc will be invoked
- * directly -- and assumed always to succeed.
- * #define Omit_Private_Memory to omit logic (added Jan. 1998) for making
- * memory allocations from a private pool of memory when possible.
- * When used, the private pool is PRIVATE_MEM bytes long: 2304 bytes,
- * unless #defined to be a different length. This default length
- * suffices to get rid of MALLOC calls except for unusual cases,
- * such as decimal-to-binary conversion of a very long string of
- * digits. The longest string dtoa can return is about 751 bytes
- * long. For conversions by strtod of strings of 800 digits and
- * all dtoa conversions in single-threaded executions with 8-byte
- * pointers, PRIVATE_MEM >= 7400 appears to suffice; with 4-byte
- * pointers, PRIVATE_MEM >= 7112 appears adequate.
- * #define INFNAN_CHECK on IEEE systems to cause strtod to check for
- * Infinity and NaN (case insensitively). On some systems (e.g.,
- * some HP systems), it may be necessary to #define NAN_WORD0
- * appropriately -- to the most significant word of a quiet NaN.
- * (On HP Series 700/800 machines, -DNAN_WORD0=0x7ff40000 works.)
- * When INFNAN_CHECK is #defined and No_Hex_NaN is not #defined,
- * strtod also accepts (case insensitively) strings of the form
- * NaN(x), where x is a string of hexadecimal digits and spaces;
- * if there is only one string of hexadecimal digits, it is taken
- * for the 52 fraction bits of the resulting NaN; if there are two
- * or more strings of hex digits, the first is for the high 20 bits,
- * the second and subsequent for the low 32 bits, with intervening
- * white space ignored; but if this results in none of the 52
- * fraction bits being on (an IEEE Infinity symbol), then NAN_WORD0
- * and NAN_WORD1 are used instead.
- * #define MULTIPLE_THREADS if the system offers preemptively scheduled
- * multiple threads. In this case, you must provide (or suitably
- * #define) two locks, acquired by ACQUIRE_DTOA_LOCK(n) and freed
- * by FREE_DTOA_LOCK(n) for n = 0 or 1. (The second lock, accessed
- * in pow5mult, ensures lazy evaluation of only one copy of high
- * powers of 5; omitting this lock would introduce a small
- * probability of wasting memory, but would otherwise be harmless.)
- * You must also invoke freedtoa(s) to free the value s returned by
- * dtoa. You may do so whether or not MULTIPLE_THREADS is #defined.
- * #define NO_IEEE_Scale to disable new (Feb. 1997) logic in strtod that
- * avoids underflows on inputs whose result does not underflow.
- * If you #define NO_IEEE_Scale on a machine that uses IEEE-format
- * floating-point numbers and flushes underflows to zero rather
- * than implementing gradual underflow, then you must also #define
- * Sudden_Underflow.
- * #define YES_ALIAS to permit aliasing certain double values with
- * arrays of ULongs. This leads to slightly better code with
- * some compilers and was always used prior to 19990916, but it
- * is not strictly legal and can cause trouble with aggressively
- * optimizing compilers (e.g., gcc 2.95.1 under -O2).
- * #define USE_LOCALE to use the current locale's decimal_point value.
- * #define SET_INEXACT if IEEE arithmetic is being used and extra
- * computation should be done to set the inexact flag when the
- * result is inexact and avoid setting inexact when the result
- * is exact. In this case, dtoa.c must be compiled in
- * an environment, perhaps provided by #include "dtoa.c" in a
- * suitable wrapper, that defines two functions,
- * int get_inexact(void);
- * void clear_inexact(void);
- * such that get_inexact() returns a nonzero value if the
- * inexact bit is already set, and clear_inexact() sets the
- * inexact bit to 0. When SET_INEXACT is #defined, strtod
- * also does extra computations to set the underflow and overflow
- * flags when appropriate (i.e., when the result is tiny and
- * inexact or when it is a numeric value rounded to +-infinity).
- * #define NO_ERRNO if strtod should not assign errno = ERANGE when
- * the result overflows to +-Infinity or underflows to 0.
- */
- #ifdef WORDS_BIGENDIAN
- #define IEEE_BIG_ENDIAN
- #else
- #define IEEE_LITTLE_ENDIAN
- #endif
- #ifdef __vax__
- #define VAX
- #undef IEEE_BIG_ENDIAN
- #undef IEEE_LITTLE_ENDIAN
- #endif
- #if defined(__arm__) && !defined(__VFP_FP__)
- #define IEEE_BIG_ENDIAN
- #undef IEEE_LITTLE_ENDIAN
- #endif
- #undef Long
- #undef ULong
- #if SIZEOF_INT == 4
- #define Long int
- #define ULong unsigned int
- #elif SIZEOF_LONG == 4
- #define Long long int
- #define ULong unsigned long int
- #endif
- #if HAVE_LONG_LONG
- #define Llong LONG_LONG
- #endif
- #ifdef DEBUG
- #include "stdio.h"
- #define Bug(x) {fprintf(stderr, "%s\n", x); exit(1);}
- #endif
- #include "stdlib.h"
- #include "string.h"
- #ifdef USE_LOCALE
- #include "locale.h"
- #endif
- #ifdef MALLOC
- extern void *MALLOC(size_t);
- #else
- #define MALLOC malloc
- #endif
- #ifndef Omit_Private_Memory
- #ifndef PRIVATE_MEM
- #define PRIVATE_MEM 2304
- #endif
- #define PRIVATE_mem ((PRIVATE_MEM+sizeof(double)-1)/sizeof(double))
- static double private_mem[PRIVATE_mem], *pmem_next = private_mem;
- #endif
- #undef IEEE_Arith
- #undef Avoid_Underflow
- #ifdef IEEE_BIG_ENDIAN
- #define IEEE_Arith
- #endif
- #ifdef IEEE_LITTLE_ENDIAN
- #define IEEE_Arith
- #endif
- #ifdef Bad_float_h
- #ifdef IEEE_Arith
- #define DBL_DIG 15
- #define DBL_MAX_10_EXP 308
- #define DBL_MAX_EXP 1024
- #define FLT_RADIX 2
- #endif /*IEEE_Arith*/
- #ifdef IBM
- #define DBL_DIG 16
- #define DBL_MAX_10_EXP 75
- #define DBL_MAX_EXP 63
- #define FLT_RADIX 16
- #define DBL_MAX 7.2370055773322621e+75
- #endif
- #ifdef VAX
- #define DBL_DIG 16
- #define DBL_MAX_10_EXP 38
- #define DBL_MAX_EXP 127
- #define FLT_RADIX 2
- #define DBL_MAX 1.7014118346046923e+38
- #endif
- #ifndef LONG_MAX
- #define LONG_MAX 2147483647
- #endif
- #else /* ifndef Bad_float_h */
- #include "float.h"
- #endif /* Bad_float_h */
- #ifndef __MATH_H__
- #include "math.h"
- #endif
- #ifdef __cplusplus
- extern "C" {
- #if 0
- }
- #endif
- #endif
- #if defined(IEEE_LITTLE_ENDIAN) + defined(IEEE_BIG_ENDIAN) + defined(VAX) + defined(IBM) != 1
- Exactly one of IEEE_LITTLE_ENDIAN, IEEE_BIG_ENDIAN, VAX, or IBM should be defined.
- #endif
- typedef union { double d; ULong L[2]; } U;
- #ifdef YES_ALIAS
- typedef double double_u;
- # define dval(x) x
- # ifdef IEEE_LITTLE_ENDIAN
- # define word0(x) (((ULong *)&x)[1])
- # define word1(x) (((ULong *)&x)[0])
- # else
- # define word0(x) (((ULong *)&x)[0])
- # define word1(x) (((ULong *)&x)[1])
- # endif
- #else
- typedef U double_u;
- # ifdef IEEE_LITTLE_ENDIAN
- # define word0(x) (x.L[1])
- # define word1(x) (x.L[0])
- # else
- # define word0(x) (x.L[0])
- # define word1(x) (x.L[1])
- # endif
- # define dval(x) (x.d)
- #endif
- /* The following definition of Storeinc is appropriate for MIPS processors.
- * An alternative that might be better on some machines is
- * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
- */
- #if defined(IEEE_LITTLE_ENDIAN) + defined(VAX) + defined(__arm__)
- #define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
- ((unsigned short *)a)[0] = (unsigned short)c, a++)
- #else
- #define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
- ((unsigned short *)a)[1] = (unsigned short)c, a++)
- #endif
- /* #define P DBL_MANT_DIG */
- /* Ten_pmax = floor(P*log(2)/log(5)) */
- /* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
- /* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */
- /* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */
- #ifdef IEEE_Arith
- #define Exp_shift 20
- #define Exp_shift1 20
- #define Exp_msk1 0x100000
- #define Exp_msk11 0x100000
- #define Exp_mask 0x7ff00000
- #define P 53
- #define Bias 1023
- #define Emin (-1022)
- #define Exp_1 0x3ff00000
- #define Exp_11 0x3ff00000
- #define Ebits 11
- #define Frac_mask 0xfffff
- #define Frac_mask1 0xfffff
- #define Ten_pmax 22
- #define Bletch 0x10
- #define Bndry_mask 0xfffff
- #define Bndry_mask1 0xfffff
- #define LSB 1
- #define Sign_bit 0x80000000
- #define Log2P 1
- #define Tiny0 0
- #define Tiny1 1
- #define Quick_max 14
- #define Int_max 14
- #ifndef NO_IEEE_Scale
- #define Avoid_Underflow
- #ifdef Flush_Denorm /* debugging option */
- #undef Sudden_Underflow
- #endif
- #endif
- #ifndef Flt_Rounds
- #ifdef FLT_ROUNDS
- #define Flt_Rounds FLT_ROUNDS
- #else
- #define Flt_Rounds 1
- #endif
- #endif /*Flt_Rounds*/
- #ifdef Honor_FLT_ROUNDS
- #define Rounding rounding
- #undef Check_FLT_ROUNDS
- #define Check_FLT_ROUNDS
- #else
- #define Rounding Flt_Rounds
- #endif
- #else /* ifndef IEEE_Arith */
- #undef Check_FLT_ROUNDS
- #undef Honor_FLT_ROUNDS
- #undef SET_INEXACT
- #undef Sudden_Underflow
- #define Sudden_Underflow
- #ifdef IBM
- #undef Flt_Rounds
- #define Flt_Rounds 0
- #define Exp_shift 24
- #define Exp_shift1 24
- #define Exp_msk1 0x1000000
- #define Exp_msk11 0x1000000
- #define Exp_mask 0x7f000000
- #define P 14
- #define Bias 65
- #define Exp_1 0x41000000
- #define Exp_11 0x41000000
- #define Ebits 8 /* exponent has 7 bits, but 8 is the right value in b2d */
- #define Frac_mask 0xffffff
- #define Frac_mask1 0xffffff
- #define Bletch 4
- #define Ten_pmax 22
- #define Bndry_mask 0xefffff
- #define Bndry_mask1 0xffffff
- #define LSB 1
- #define Sign_bit 0x80000000
- #define Log2P 4
- #define Tiny0 0x100000
- #define Tiny1 0
- #define Quick_max 14
- #define Int_max 15
- #else /* VAX */
- #undef Flt_Rounds
- #define Flt_Rounds 1
- #define Exp_shift 23
- #define Exp_shift1 7
- #define Exp_msk1 0x80
- #define Exp_msk11 0x800000
- #define Exp_mask 0x7f80
- #define P 56
- #define Bias 129
- #define Exp_1 0x40800000
- #define Exp_11 0x4080
- #define Ebits 8
- #define Frac_mask 0x7fffff
- #define Frac_mask1 0xffff007f
- #define Ten_pmax 24
- #define Bletch 2
- #define Bndry_mask 0xffff007f
- #define Bndry_mask1 0xffff007f
- #define LSB 0x10000
- #define Sign_bit 0x8000
- #define Log2P 1
- #define Tiny0 0x80
- #define Tiny1 0
- #define Quick_max 15
- #define Int_max 15
- #endif /* IBM, VAX */
- #endif /* IEEE_Arith */
- #ifndef IEEE_Arith
- #define ROUND_BIASED
- #endif
- #ifdef RND_PRODQUOT
- #define rounded_product(a,b) a = rnd_prod(a, b)
- #define rounded_quotient(a,b) a = rnd_quot(a, b)
- extern double rnd_prod(double, double), rnd_quot(double, double);
- #else
- #define rounded_product(a,b) a *= b
- #define rounded_quotient(a,b) a /= b
- #endif
- #define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1))
- #define Big1 0xffffffff
- #ifndef Pack_32
- #define Pack_32
- #endif
- #define FFFFFFFF 0xffffffffUL
- #ifdef NO_LONG_LONG
- #undef ULLong
- #ifdef Just_16
- #undef Pack_32
- /* When Pack_32 is not defined, we store 16 bits per 32-bit Long.
- * This makes some inner loops simpler and sometimes saves work
- * during multiplications, but it often seems to make things slightly
- * slower. Hence the default is now to store 32 bits per Long.
- */
- #endif
- #else /* long long available */
- #ifndef Llong
- #define Llong long long
- #endif
- #ifndef ULLong
- #define ULLong unsigned Llong
- #endif
- #endif /* NO_LONG_LONG */
- #define MULTIPLE_THREADS 1
- #ifndef MULTIPLE_THREADS
- #define ACQUIRE_DTOA_LOCK(n) /*nothing*/
- #define FREE_DTOA_LOCK(n) /*nothing*/
- #else
- #define ACQUIRE_DTOA_LOCK(n) /*unused right now*/
- #define FREE_DTOA_LOCK(n) /*unused right now*/
- #endif
- #define Kmax 15
- struct Bigint {
- struct Bigint *next;
- int k, maxwds, sign, wds;
- ULong x[1];
- };
- typedef struct Bigint Bigint;
- static Bigint *freelist[Kmax+1];
- static Bigint *
- Balloc(int k)
- {
- int x;
- Bigint *rv;
- #ifndef Omit_Private_Memory
- size_t len;
- #endif
- ACQUIRE_DTOA_LOCK(0);
- if ((rv = freelist[k]) != 0) {
- freelist[k] = rv->next;
- }
- else {
- x = 1 << k;
- #ifdef Omit_Private_Memory
- rv = (Bigint *)MALLOC(sizeof(Bigint) + (x-1)*sizeof(ULong));
- #else
- len = (sizeof(Bigint) + (x-1)*sizeof(ULong) + sizeof(double) - 1)
- /sizeof(double);
- if (pmem_next - private_mem + len <= PRIVATE_mem) {
- rv = (Bigint*)pmem_next;
- pmem_next += len;
- }
- else
- rv = (Bigint*)MALLOC(len*sizeof(double));
- #endif
- rv->k = k;
- rv->maxwds = x;
- }
- FREE_DTOA_LOCK(0);
- rv->sign = rv->wds = 0;
- return rv;
- }
- static void
- Bfree(Bigint *v)
- {
- if (v) {
- ACQUIRE_DTOA_LOCK(0);
- v->next = freelist[v->k];
- freelist[v->k] = v;
- FREE_DTOA_LOCK(0);
- }
- }
- #define Bcopy(x,y) memcpy((char *)&x->sign, (char *)&y->sign, \
- y->wds*sizeof(Long) + 2*sizeof(int))
- static Bigint *
- multadd(Bigint *b, int m, int a) /* multiply by m and add a */
- {
- int i, wds;
- ULong *x;
- #ifdef ULLong
- ULLong carry, y;
- #else
- ULong carry, y;
- #ifdef Pack_32
- ULong xi, z;
- #endif
- #endif
- Bigint *b1;
- wds = b->wds;
- x = b->x;
- i = 0;
- carry = a;
- do {
- #ifdef ULLong
- y = *x * (ULLong)m + carry;
- carry = y >> 32;
- *x++ = (ULong)(y & FFFFFFFF);
- #else
- #ifdef Pack_32
- xi = *x;
- y = (xi & 0xffff) * m + carry;
- z = (xi >> 16) * m + (y >> 16);
- carry = z >> 16;
- *x++ = (z << 16) + (y & 0xffff);
- #else
- y = *x * m + carry;
- carry = y >> 16;
- *x++ = y & 0xffff;
- #endif
- #endif
- } while (++i < wds);
- if (carry) {
- if (wds >= b->maxwds) {
- b1 = Balloc(b->k+1);
- Bcopy(b1, b);
- Bfree(b);
- b = b1;
- }
- b->x[wds++] = (ULong)carry;
- b->wds = wds;
- }
- return b;
- }
- static Bigint *
- s2b(const char *s, int nd0, int nd, ULong y9)
- {
- Bigint *b;
- int i, k;
- Long x, y;
- x = (nd + 8) / 9;
- for (k = 0, y = 1; x > y; y <<= 1, k++) ;
- #ifdef Pack_32
- b = Balloc(k);
- b->x[0] = y9;
- b->wds = 1;
- #else
- b = Balloc(k+1);
- b->x[0] = y9 & 0xffff;
- b->wds = (b->x[1] = y9 >> 16) ? 2 : 1;
- #endif
- i = 9;
- if (9 < nd0) {
- s += 9;
- do {
- b = multadd(b, 10, *s++ - '0');
- } while (++i < nd0);
- s++;
- }
- else
- s += 10;
- for (; i < nd; i++)
- b = multadd(b, 10, *s++ - '0');
- return b;
- }
- static int
- hi0bits(register ULong x)
- {
- register int k = 0;
- if (!(x & 0xffff0000)) {
- k = 16;
- x <<= 16;
- }
- if (!(x & 0xff000000)) {
- k += 8;
- x <<= 8;
- }
- if (!(x & 0xf0000000)) {
- k += 4;
- x <<= 4;
- }
- if (!(x & 0xc0000000)) {
- k += 2;
- x <<= 2;
- }
- if (!(x & 0x80000000)) {
- k++;
- if (!(x & 0x40000000))
- return 32;
- }
- return k;
- }
- static int
- lo0bits(ULong *y)
- {
- register int k;
- register ULong x = *y;
- if (x & 7) {
- if (x & 1)
- return 0;
- if (x & 2) {
- *y = x >> 1;
- return 1;
- }
- *y = x >> 2;
- return 2;
- }
- k = 0;
- if (!(x & 0xffff)) {
- k = 16;
- x >>= 16;
- }
- if (!(x & 0xff)) {
- k += 8;
- x >>= 8;
- }
- if (!(x & 0xf)) {
- k += 4;
- x >>= 4;
- }
- if (!(x & 0x3)) {
- k += 2;
- x >>= 2;
- }
- if (!(x & 1)) {
- k++;
- x >>= 1;
- if (!x)
- return 32;
- }
- *y = x;
- return k;
- }
- static Bigint *
- i2b(int i)
- {
- Bigint *b;
- b = Balloc(1);
- b->x[0] = i;
- b->wds = 1;
- return b;
- }
- static Bigint *
- mult(Bigint *a, Bigint *b)
- {
- Bigint *c;
- int k, wa, wb, wc;
- ULong *x, *xa, *xae, *xb, *xbe, *xc, *xc0;
- ULong y;
- #ifdef ULLong
- ULLong carry, z;
- #else
- ULong carry, z;
- #ifdef Pack_32
- ULong z2;
- #endif
- #endif
- if (a->wds < b->wds) {
- c = a;
- a = b;
- b = c;
- }
- k = a->k;
- wa = a->wds;
- wb = b->wds;
- wc = wa + wb;
- if (wc > a->maxwds)
- k++;
- c = Balloc(k);
- for (x = c->x, xa = x + wc; x < xa; x++)
- *x = 0;
- xa = a->x;
- xae = xa + wa;
- xb = b->x;
- xbe = xb + wb;
- xc0 = c->x;
- #ifdef ULLong
- for (; xb < xbe; xc0++) {
- if ((y = *xb++) != 0) {
- x = xa;
- xc = xc0;
- carry = 0;
- do {
- z = *x++ * (ULLong)y + *xc + carry;
- carry = z >> 32;
- *xc++ = (ULong)(z & FFFFFFFF);
- } while (x < xae);
- *xc = (ULong)carry;
- }
- }
- #else
- #ifdef Pack_32
- for (; xb < xbe; xb++, xc0++) {
- if (y = *xb & 0xffff) {
- x = xa;
- xc = xc0;
- carry = 0;
- do {
- z = (*x & 0xffff) * y + (*xc & 0xffff) + carry;
- carry = z >> 16;
- z2 = (*x++ >> 16) * y + (*xc >> 16) + carry;
- carry = z2 >> 16;
- Storeinc(xc, z2, z);
- } while (x < xae);
- *xc = (ULong)carry;
- }
- if (y = *xb >> 16) {
- x = xa;
- xc = xc0;
- carry = 0;
- z2 = *xc;
- do {
- z = (*x & 0xffff) * y + (*xc >> 16) + carry;
- carry = z >> 16;
- Storeinc(xc, z, z2);
- z2 = (*x++ >> 16) * y + (*xc & 0xffff) + carry;
- carry = z2 >> 16;
- } while (x < xae);
- *xc = z2;
- }
- }
- #else
- for (; xb < xbe; xc0++) {
- if (y = *xb++) {
- x = xa;
- xc = xc0;
- carry = 0;
- do {
- z = *x++ * y + *xc + carry;
- carry = z >> 16;
- *xc++ = z & 0xffff;
- } while (x < xae);
- *xc = (ULong)carry;
- }
- }
- #endif
- #endif
- for (xc0 = c->x, xc = xc0 + wc; wc > 0 && !*--xc; --wc) ;
- c->wds = wc;
- return c;
- }
- static Bigint *p5s;
- static Bigint *
- pow5mult(Bigint *b, int k)
- {
- Bigint *b1, *p5, *p51;
- int i;
- static int p05[3] = { 5, 25, 125 };
- if ((i = k & 3) != 0)
- b = multadd(b, p05[i-1], 0);
- if (!(k >>= 2))
- return b;
- if (!(p5 = p5s)) {
- /* first time */
- #ifdef MULTIPLE_THREADS
- ACQUIRE_DTOA_LOCK(1);
- if (!(p5 = p5s)) {
- p5 = p5s = i2b(625);
- p5->next = 0;
- }
- FREE_DTOA_LOCK(1);
- #else
- p5 = p5s = i2b(625);
- p5->next = 0;
- #endif
- }
- for (;;) {
- if (k & 1) {
- b1 = mult(b, p5);
- Bfree(b);
- b = b1;
- }
- if (!(k >>= 1))
- break;
- if (!(p51 = p5->next)) {
- #ifdef MULTIPLE_THREADS
- ACQUIRE_DTOA_LOCK(1);
- if (!(p51 = p5->next)) {
- p51 = p5->next = mult(p5,p5);
- p51->next = 0;
- }
- FREE_DTOA_LOCK(1);
- #else
- p51 = p5->next = mult(p5,p5);
- p51->next = 0;
- #endif
- }
- p5 = p51;
- }
- return b;
- }
- static Bigint *
- lshift(Bigint *b, int k)
- {
- int i, k1, n, n1;
- Bigint *b1;
- ULong *x, *x1, *xe, z;
- #ifdef Pack_32
- n = k >> 5;
- #else
- n = k >> 4;
- #endif
- k1 = b->k;
- n1 = n + b->wds + 1;
- for (i = b->maxwds; n1 > i; i <<= 1)
- k1++;
- b1 = Balloc(k1);
- x1 = b1->x;
- for (i = 0; i < n; i++)
- *x1++ = 0;
- x = b->x;
- xe = x + b->wds;
- #ifdef Pack_32
- if (k &= 0x1f) {
- k1 = 32 - k;
- z = 0;
- do {
- *x1++ = *x << k | z;
- z = *x++ >> k1;
- } while (x < xe);
- if ((*x1 = z) != 0)
- ++n1;
- }
- #else
- if (k &= 0xf) {
- k1 = 16 - k;
- z = 0;
- do {
- *x1++ = *x << k & 0xffff | z;
- z = *x++ >> k1;
- } while (x < xe);
- if (*x1 = z)
- ++n1;
- }
- #endif
- else
- do {
- *x1++ = *x++;
- } while (x < xe);
- b1->wds = n1 - 1;
- Bfree(b);
- return b1;
- }
- static int
- cmp(Bigint *a, Bigint *b)
- {
- ULong *xa, *xa0, *xb, *xb0;
- int i, j;
- i = a->wds;
- j = b->wds;
- #ifdef DEBUG
- if (i > 1 && !a->x[i-1])
- Bug("cmp called with a->x[a->wds-1] == 0");
- if (j > 1 && !b->x[j-1])
- Bug("cmp called with b->x[b->wds-1] == 0");
- #endif
- if (i -= j)
- return i;
- xa0 = a->x;
- xa = xa0 + j;
- xb0 = b->x;
- xb = xb0 + j;
- for (;;) {
- if (*--xa != *--xb)
- return *xa < *xb ? -1 : 1;
- if (xa <= xa0)
- break;
- }
- return 0;
- }
- static Bigint *
- diff(Bigint *a, Bigint *b)
- {
- Bigint *c;
- int i, wa, wb;
- ULong *xa, *xae, *xb, *xbe, *xc;
- #ifdef ULLong
- ULLong borrow, y;
- #else
- ULong borrow, y;
- #ifdef Pack_32
- ULong z;
- #endif
- #endif
- i = cmp(a,b);
- if (!i) {
- c = Balloc(0);
- c->wds = 1;
- c->x[0] = 0;
- return c;
- }
- if (i < 0) {
- c = a;
- a = b;
- b = c;
- i = 1;
- }
- else
- i = 0;
- c = Balloc(a->k);
- c->sign = i;
- wa = a->wds;
- xa = a->x;
- xae = xa + wa;
- wb = b->wds;
- xb = b->x;
- xbe = xb + wb;
- xc = c->x;
- borrow = 0;
- #ifdef ULLong
- do {
- y = (ULLong)*xa++ - *xb++ - borrow;
- borrow = y >> 32 & (ULong)1;
- *xc++ = (ULong)(y & FFFFFFFF);
- } while (xb < xbe);
- while (xa < xae) {
- y = *xa++ - borrow;
- borrow = y >> 32 & (ULong)1;
- *xc++ = (ULong)(y & FFFFFFFF);
- }
- #else
- #ifdef Pack_32
- do {
- y = (*xa & 0xffff) - (*xb & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- z = (*xa++ >> 16) - (*xb++ >> 16) - borrow;
- borrow = (z & 0x10000) >> 16;
- Storeinc(xc, z, y);
- } while (xb < xbe);
- while (xa < xae) {
- y = (*xa & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- z = (*xa++ >> 16) - borrow;
- borrow = (z & 0x10000) >> 16;
- Storeinc(xc, z, y);
- }
- #else
- do {
- y = *xa++ - *xb++ - borrow;
- borrow = (y & 0x10000) >> 16;
- *xc++ = y & 0xffff;
- } while (xb < xbe);
- while (xa < xae) {
- y = *xa++ - borrow;
- borrow = (y & 0x10000) >> 16;
- *xc++ = y & 0xffff;
- }
- #endif
- #endif
- while (!*--xc)
- wa--;
- c->wds = wa;
- return c;
- }
- static double
- ulp(double x_)
- {
- register Long L;
- double_u x, a;
- dval(x) = x_;
- L = (word0(x) & Exp_mask) - (P-1)*Exp_msk1;
- #ifndef Avoid_Underflow
- #ifndef Sudden_Underflow
- if (L > 0) {
- #endif
- #endif
- #ifdef IBM
- L |= Exp_msk1 >> 4;
- #endif
- word0(a) = L;
- word1(a) = 0;
- #ifndef Avoid_Underflow
- #ifndef Sudden_Underflow
- }
- else {
- L = -L >> Exp_shift;
- if (L < Exp_shift) {
- word0(a) = 0x80000 >> L;
- word1(a) = 0;
- }
- else {
- word0(a) = 0;
- L -= Exp_shift;
- word1(a) = L >= 31 ? 1 : 1 << 31 - L;
- }
- }
- #endif
- #endif
- return dval(a);
- }
- static double
- b2d(Bigint *a, int *e)
- {
- ULong *xa, *xa0, w, y, z;
- int k;
- double_u d;
- #ifdef VAX
- ULong d0, d1;
- #else
- #define d0 word0(d)
- #define d1 word1(d)
- #endif
- xa0 = a->x;
- xa = xa0 + a->wds;
- y = *--xa;
- #ifdef DEBUG
- if (!y) Bug("zero y in b2d");
- #endif
- k = hi0bits(y);
- *e = 32 - k;
- #ifdef Pack_32
- if (k < Ebits) {
- d0 = Exp_1 | y >> (Ebits - k);
- w = xa > xa0 ? *--xa : 0;
- d1 = y << ((32-Ebits) + k) | w >> (Ebits - k);
- goto ret_d;
- }
- z = xa > xa0 ? *--xa : 0;
- if (k -= Ebits) {
- d0 = Exp_1 | y << k | z >> (32 - k);
- y = xa > xa0 ? *--xa : 0;
- d1 = z << k | y >> (32 - k);
- }
- else {
- d0 = Exp_1 | y;
- d1 = z;
- }
- #else
- if (k < Ebits + 16) {
- z = xa > xa0 ? *--xa : 0;
- d0 = Exp_1 | y << k - Ebits | z >> Ebits + 16 - k;
- w = xa > xa0 ? *--xa : 0;
- y = xa > xa0 ? *--xa : 0;
- d1 = z << k + 16 - Ebits | w << k - Ebits | y >> 16 + Ebits - k;
- goto ret_d;
- }
- z = xa > xa0 ? *--xa : 0;
- w = xa > xa0 ? *--xa : 0;
- k -= Ebits + 16;
- d0 = Exp_1 | y << k + 16 | z << k | w >> 16 - k;
- y = xa > xa0 ? *--xa : 0;
- d1 = w << k + 16 | y << k;
- #endif
- ret_d:
- #ifdef VAX
- word0(d) = d0 >> 16 | d0 << 16;
- word1(d) = d1 >> 16 | d1 << 16;
- #else
- #undef d0
- #undef d1
- #endif
- return dval(d);
- }
- static Bigint *
- d2b(double d_, int *e, int *bits)
- {
- double_u d;
- Bigint *b;
- int de, k;
- ULong *x, y, z;
- #ifndef Sudden_Underflow
- int i;
- #endif
- #ifdef VAX
- ULong d0, d1;
- #endif
- dval(d) = d_;
- #ifdef VAX
- d0 = word0(d) >> 16 | word0(d) << 16;
- d1 = word1(d) >> 16 | word1(d) << 16;
- #else
- #define d0 word0(d)
- #define d1 word1(d)
- #endif
- #ifdef Pack_32
- b = Balloc(1);
- #else
- b = Balloc(2);
- #endif
- x = b->x;
- z = d0 & Frac_mask;
- d0 &= 0x7fffffff; /* clear sign bit, which we ignore */
- #ifdef Sudden_Underflow
- de = (int)(d0 >> Exp_shift);
- #ifndef IBM
- z |= Exp_msk11;
- #endif
- #else
- if ((de = (int)(d0 >> Exp_shift)) != 0)
- z |= Exp_msk1;
- #endif
- #ifdef Pack_32
- if ((y = d1) != 0) {
- if ((k = lo0bits(&y)) != 0) {
- x[0] = y | z << (32 - k);
- z >>= k;
- }
- else
- x[0] = y;
- #ifndef Sudden_Underflow
- i =
- #endif
- b->wds = (x[1] = z) ? 2 : 1;
- }
- else {
- #ifdef DEBUG
- if (!z)
- Bug("Zero passed to d2b");
- #endif
- k = lo0bits(&z);
- x[0] = z;
- #ifndef Sudden_Underflow
- i =
- #endif
- b->wds = 1;
- k += 32;
- }
- #else
- if (y = d1) {
- if (k = lo0bits(&y))
- if (k >= 16) {
- x[0] = y | z << 32 - k & 0xffff;
- x[1] = z >> k - 16 & 0xffff;
- x[2] = z >> k;
- i = 2;
- }
- else {
- x[0] = y & 0xffff;
- x[1] = y >> 16 | z << 16 - k & 0xffff;
- x[2] = z >> k & 0xffff;
- x[3] = z >> k+16;
- i = 3;
- }
- else {
- x[0] = y & 0xffff;
- x[1] = y >> 16;
- x[2] = z & 0xffff;
- x[3] = z >> 16;
- i = 3;
- }
- }
- else {
- #ifdef DEBUG
- if (!z)
- Bug("Zero passed to d2b");
- #endif
- k = lo0bits(&z);
- if (k >= 16) {
- x[0] = z;
- i = 0;
- }
- else {
- x[0] = z & 0xffff;
- x[1] = z >> 16;
- i = 1;
- }
- k += 32;
- }
- while (!x[i])
- --i;
- b->wds = i + 1;
- #endif
- #ifndef Sudden_Underflow
- if (de) {
- #endif
- #ifdef IBM
- *e = (de - Bias - (P-1) << 2) + k;
- *bits = 4*P + 8 - k - hi0bits(word0(d) & Frac_mask);
- #else
- *e = de - Bias - (P-1) + k;
- *bits = P - k;
- #endif
- #ifndef Sudden_Underflow
- }
- else {
- *e = de - Bias - (P-1) + 1 + k;
- #ifdef Pack_32
- *bits = 32*i - hi0bits(x[i-1]);
- #else
- *bits = (i+2)*16 - hi0bits(x[i]);
- #endif
- }
- #endif
- return b;
- }
- #undef d0
- #undef d1
- static double
- ratio(Bigint *a, Bigint *b)
- {
- double_u da, db;
- int k, ka, kb;
- dval(da) = b2d(a, &ka);
- dval(db) = b2d(b, &kb);
- #ifdef Pack_32
- k = ka - kb + 32*(a->wds - b->wds);
- #else
- k = ka - kb + 16*(a->wds - b->wds);
- #endif
- #ifdef IBM
- if (k > 0) {
- word0(da) += (k >> 2)*Exp_msk1;
- if (k &= 3)
- dval(da) *= 1 << k;
- }
- else {
- k = -k;
- word0(db) += (k >> 2)*Exp_msk1;
- if (k &= 3)
- dval(db) *= 1 << k;
- }
- #else
- if (k > 0)
- word0(da) += k*Exp_msk1;
- else {
- k = -k;
- word0(db) += k*Exp_msk1;
- }
- #endif
- return dval(da) / dval(db);
- }
- static const double
- tens[] = {
- 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
- 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
- 1e20, 1e21, 1e22
- #ifdef VAX
- , 1e23, 1e24
- #endif
- };
- static const double
- #ifdef IEEE_Arith
- bigtens[] = { 1e16, 1e32, 1e64, 1e128, 1e256 };
- static const double tinytens[] = { 1e-16, 1e-32, 1e-64, 1e-128,
- #ifdef Avoid_Underflow
- 9007199254740992.*9007199254740992.e-256
- /* = 2^106 * 1e-53 */
- #else
- 1e-256
- #endif
- };
- /* The factor of 2^53 in tinytens[4] helps us avoid setting the underflow */
- /* flag unnecessarily. It leads to a song and dance at the end of strtod. */
- #define Scale_Bit 0x10
- #define n_bigtens 5
- #else
- #ifdef IBM
- bigtens[] = { 1e16, 1e32, 1e64 };
- static const double tinytens[] = { 1e-16, 1e-32, 1e-64 };
- #define n_bigtens 3
- #else
- bigtens[] = { 1e16, 1e32 };
- static const double tinytens[] = { 1e-16, 1e-32 };
- #define n_bigtens 2
- #endif
- #endif
- #ifndef IEEE_Arith
- #undef INFNAN_CHECK
- #endif
- #ifdef INFNAN_CHECK
- #ifndef NAN_WORD0
- #define NAN_WORD0 0x7ff80000
- #endif
- #ifndef NAN_WORD1
- #define NAN_WORD1 0
- #endif
- static int
- match(const char **sp, char *t)
- {
- int c, d;
- const char *s = *sp;
- while (d = *t++) {
- if ((c = *++s) >= 'A' && c <= 'Z')
- c += 'a' - 'A';
- if (c != d)
- return 0;
- }
- *sp = s + 1;
- return 1;
- }
- #ifndef No_Hex_NaN
- static void
- hexnan(double *rvp, const char **sp)
- {
- ULong c, x[2];
- const char *s;
- int havedig, udx0, xshift;
- x[0] = x[1] = 0;
- havedig = xshift = 0;
- udx0 = 1;
- s = *sp;
- while (c = *(const unsigned char*)++s) {
- if (c >= '0' && c <= '9')
- c -= '0';
- else if (c >= 'a' && c <= 'f')
- c += 10 - 'a';
- else if (c >= 'A' && c <= 'F')
- c += 10 - 'A';
- else if (c <= ' ') {
- if (udx0 && havedig) {
- udx0 = 0;
- xshift = 1;
- }
- continue;
- }
- else if (/*(*/ c == ')' && havedig) {
- *sp = s + 1;
- break;
- }
- else
- return; /* invalid form: don't change *sp */
- havedig = 1;
- if (xshift) {
- xshift = 0;
- x[0] = x[1];
- x[1] = 0;
- }
- if (udx0)
- x[0] = (x[0] << 4) | (x[1] >> 28);
- x[1] = (x[1] << 4) | c;
- }
- if ((x[0] &= 0xfffff) || x[1]) {
- word0(*rvp) = Exp_mask | x[0];
- word1(*rvp) = x[1];
- }
- }
- #endif /*No_Hex_NaN*/
- #endif /* INFNAN_CHECK */
- double
- ruby_strtod(const char *s00, char **se)
- {
- #ifdef Avoid_Underflow
- int scale;
- #endif
- int bb2, bb5, bbe, bd2, bd5, bbbits, bs2, c, dsign,
- e, e1, esign, i, j, k, nd, nd0, nf, nz, nz0, sign;
- const char *s, *s0, *s1;
- double aadj, adj;
- double_u aadj1, rv, rv0;
- Long L;
- ULong y, z;
- Bigint *bb, *bb1, *bd, *bd0, *bs, *delta;
- #ifdef SET_INEXACT
- int inexact, oldinexact;
- #endif
- #ifdef Honor_FLT_ROUNDS
- int rounding;
- #endif
- #ifdef USE_LOCALE
- const char *s2;
- #endif
- errno = 0;
- sign = nz0 = nz = 0;
- dval(rv) = 0.;
- for (s = s00;;s++)
- switch (*s) {
- case '-':
- sign = 1;
- /* no break */
- case '+':
- if (*++s)
- goto break2;
- /* no break */
- case 0:
- goto ret0;
- case '\t':
- case '\n':
- case '\v':
- case '\f':
- case '\r':
- case ' ':
- continue;
- default:
- goto break2;
- }
- break2:
- if (*s == '0') {
- if (s[1] == 'x' || s[1] == 'X') {
- static const char hexdigit[] = "0123456789abcdef0123456789ABCDEF";
- s0 = ++s;
- adj = 0;
- aadj = -1;
- if (!*++s || !(s1 = strchr(hexdigit, *s))) goto ret0;
- do {
- adj *= 16;
- adj += (s1 - hexdigit) & 15;
- } while (*++s && (s1 = strchr(hexdigit, *s)));
- if (*s == '.') {
- aadj = 1.;
- while (*++s && (s1 = strchr(hexdigit, *s))) {
- aadj /= 16;
- adj += aadj * ((s1 - hexdigit) & 15);
- }
- }
- if (*s == 'P' || *s == 'p') {
- dsign = 0x2C - *++s; /* +: 2B, -: 2D */
- if (abs(dsign) == 1) s++;
- else dsign = 1;
- nd = 0;
- c = *s;
- if (c < '0' || '9' < c) goto ret0;
- do {
- nd *= 10;
- nd += c;
- nd -= '0';
- c = *++s;
- /* Float("0x0."+("0"*267)+"1fp2095") */
- if (abs(nd) > 2095) {
- while ('0' <= c && c <= '9') c = *++s;
- break;
- }
- } while ('0' <= c && c <= '9');
- dval(rv) = ldexp(adj, nd * dsign);
- }
- else {
- if (aadj != -1) goto ret0;
- dval(rv) = adj;
- }
- goto ret;
- }
- nz0 = 1;
- while (*++s == '0') ;
- if (!*s)
- goto ret;
- }
- s0 = s;
- y = z = 0;
- for (nd = nf = 0; (c = *s) >= '0' && c <= '9'; nd++, s++)
- if (nd < 9)
- y = 10*y + c - '0';
- else if (nd < 16)
- z = 10*z + c - '0';
- nd0 = nd;
- #ifdef USE_LOCALE
- s1 = localeconv()->decimal_point;
- if (c == *s1) {
- c = '.';
- if (*++s1) {
- s2 = s;
- for (;;) {
- if (*++s2 != *s1) {
- c = 0;
- break;
- }
- if (!*++s1) {
- s = s2;
- break;
- }
- }
- }
- }
- #endif
- if (c == '.') {
- if (!ISDIGIT(s[1]))
- goto dig_done;
- c = *++s;
- if (!nd) {
- for (; c == '0'; c = *++s)
- nz++;
- if (c > '0' && c <= '9') {
- s0 = s;
- nf += nz;
- nz = 0;
- goto have_dig;
- }
- goto dig_done;
- }
- for (; c >= '0' && c <= '9'; c = *++s) {
- have_dig:
- nz++;
- if (c -= '0') {
- nf += nz;
- for (i = 1; i < nz; i++)
- if (nd++ < 9)
- y *= 10;
- else if (nd <= DBL_DIG + 1)
- z *= 10;
- if (nd++ < 9)
- y = 10*y + c;
- else if (nd <= DBL_DIG + 1)
- z = 10*z + c;
- nz = 0;
- }
- }
- }
- dig_done:
- e = 0;
- if (c == 'e' || c == 'E') {
- if (!nd && !nz && !nz0) {
- goto ret0;
- }
- s00 = s;
- esign = 0;
- switch (c = *++s) {
- case '-':
- esign = 1;
- case '+':
- c = *++s;
- }
- if (c >= '0' && c <= '9') {
- while (c == '0')
- c = *++s;
- if (c > '0' && c <= '9') {
- L = c - '0';
- s1 = s;
- while ((c = *++s) >= '0' && c <= '9')
- L = 10*L + c - '0';
- if (s - s1 > 8 || L > 19999)
- /* Avoid confusion from exponents
- * so large that e might overflow.
- */
- e = 19999; /* safe for 16 bit ints */
- else
- e = (int)L;
- if (esign)
- e = -e;
- }
- else
- e = 0;
- }
- else
- s = s00;
- }
- if (!nd) {
- if (!nz && !nz0) {
- #ifdef INFNAN_CHECK
- /* Check for Nan and Infinity */
- switch (c) {
- case 'i':
- case 'I':
- if (match(&s,"nf")) {
- --s;
- if (!match(&s,"inity"))
- ++s;
- word0(rv) = 0x7ff00000;
- word1(rv) = 0;
- goto ret;
- }
- break;
- case 'n':
- case 'N':
- if (match(&s, "an")) {
- word0(rv) = NAN_WORD0;
- word1(rv) = NAN_WORD1;
- #ifndef No_Hex_NaN
- if (*s == '(') /*)*/
- hexnan(&rv, &s);
- #endif
- goto ret;
- }
- }
- #endif /* INFNAN_CHECK */
- ret0:
- s = s00;
- sign = 0;
- }
- goto ret;
- }
- e1 = e -= nf;
- /* Now we have nd0 digits, starting at s0, followed by a
- * decimal point, followed by nd-nd0 digits. The number we're
- * after is the integer represented by those digits times
- * 10**e */
- if (!nd0)
- nd0 = nd;
- k = nd < DBL_DIG + 1 ? nd : DBL_DIG + 1;
- dval(rv) = y;
- if (k > 9) {
- #ifdef SET_INEXACT
- if (k > DBL_DIG)
- oldinexact = get_inexact();
- #endif
- dval(rv) = tens[k - 9] * dval(rv) + z;
- }
- bd0 = bb = bd = bs = delta = 0;
- if (nd <= DBL_DIG
- #ifndef RND_PRODQUOT
- #ifndef Honor_FLT_ROUNDS
- && Flt_Rounds == 1
- #endif
- #endif
- ) {
- if (!e)
- goto ret;
- if (e > 0) {
- if (e <= Ten_pmax) {
- #ifdef VAX
- goto vax_ovfl_check;
- #else
- #ifdef Honor_FLT_ROUNDS
- /* round correctly FLT_ROUNDS = 2 or 3 */
- if (sign) {
- dval(rv) = -dval(rv);
- sign = 0;
- }
- #endif
- /* rv = */ rounded_product(dval(rv), tens[e]);
- goto ret;
- #endif
- }
- i = DBL_DIG - nd;
- if (e <= Ten_pmax + i) {
- /* A fancier test would sometimes let us do
- * this for larger i values.
- */
- #ifdef Honor_FLT_ROUNDS
- /* round correctly FLT_ROUNDS = 2 or 3 */
- if (sign) {
- dval(rv) = -dval(rv);
- sign = 0;
- }
- #endif
- e -= i;
- dval(rv) *= tens[i];
- #ifdef VAX
- /* VAX exponent range is so narrow we must
- * worry about overflow here...
- */
- vax_ovfl_check:
- word0(rv) -= P*Exp_msk1;
- /* rv = */ rounded_product(dval(rv), tens[e]);
- if ((word0(rv) & Exp_mask)
- > Exp_msk1*(DBL_MAX_EXP+Bias-1-P))
- goto ovfl;
- word0(rv) += P*Exp_msk1;
- #else
- /* rv = */ rounded_product(dval(rv), tens[e]);
- #endif
- goto ret;
- }
- }
- #ifndef Inaccurate_Divide
- else if (e >= -Ten_pmax) {
- #ifdef Honor_FLT_ROUNDS
- /* round correctly FLT_ROUNDS = 2 or 3 */
- if (sign) {
- dval(rv) = -dval(rv);
- sign = 0;
- }
- #endif
- /* rv = */ rounded_quotient(dval(rv), tens[-e]);
- goto ret;
- }
- #endif
- }
- e1 += nd - k;
- #ifdef IEEE_Arith
- #ifdef SET_INEXACT
- inexact = 1;
- if (k <= DBL_DIG)
- oldinexact = get_inexact();
- #endif
- #ifdef Avoid_Underflow
- scale = 0;
- #endif
- #ifdef Honor_FLT_ROUNDS
- if ((rounding = Flt_Rounds) >= 2) {
- if (sign)
- rounding = rounding == 2 ? 0 : 2;
- else
- if (rounding != 2)
- rounding = 0;
- }
- #endif
- #endif /*IEEE_Arith*/
- /* Get starting approximation = rv * 10**e1 */
- if (e1 > 0) {
- if ((i = e1 & 15) != 0)
- dval(rv) *= tens[i];
- if (e1 &= ~15) {
- if (e1 > DBL_MAX_10_EXP) {
- ovfl:
- #ifndef NO_ERRNO
- errno = ERANGE;
- #endif
- /* Can't trust HUGE_VAL */
- #ifdef IEEE_Arith
- #ifdef Honor_FLT_ROUNDS
- switch (rounding) {
- case 0: /* toward 0 */
- case 3: /* toward -infinity */
- word0(rv) = Big0;
- word1(rv) = Big1;
- break;
- default:
- word0(rv) = Exp_mask;
- word1(rv) = 0;
- }
- #else /*Honor_FLT_ROUNDS*/
- word0(rv) = Exp_mask;
- word1(rv) = 0;
- #endif /*Honor_FLT_ROUNDS*/
- #ifdef SET_INEXACT
- /* set overflow bit */
- dval(rv0) = 1e300;
- dval(rv0) *= dval(rv0);
- #endif
- #else /*IEEE_Arith*/
- word0(rv) = Big0;
- word1(rv) = Big1;
- #endif /*IEEE_Arith*/
- if (bd0)
- goto retfree;
- goto ret;
- }
- e1 >>= 4;
- for (j = 0; e1 > 1; j++, e1 >>= 1)
- if (e1 & 1)
- dval(rv) *= bigtens[j];
- /* The last multiplication could overflow. */
- word0(rv) -= P*Exp_msk1;
- dval(rv) *= bigtens[j];
- if ((z = word0(rv) & Exp_mask)
- > Exp_msk1*(DBL_MAX_EXP+Bias-P))
- goto ovfl;
- if (z > Exp_msk1*(DBL_MAX_EXP+Bias-1-P)) {
- /* set to largest number */
- /* (Can't trust DBL_MAX) */
- word0(rv) = Big0;
- word1(rv) = Big1;
- }
- else
- word0(rv) += P*Exp_msk1;
- }
- }
- else if (e1 < 0) {
- e1 = -e1;
- if ((i = e1 & 15) != 0)
- dval(rv) /= tens[i];
- if (e1 >>= 4) {
- if (e1 >= 1 << n_bigtens)
- goto undfl;
- #ifdef Avoid_Underflow
- if (e1 & Scale_Bit)
- scale = 2*P;
- for (j = 0; e1 > 0; j++, e1 >>= 1)
- if (e1 & 1)
- dval(rv) *= tinytens[j];
- if (scale && (j = 2*P + 1 - ((word0(rv) & Exp_mask)
- >> Exp_shift)) > 0) {
- /* scaled rv is denormal; zap j low bits */
- if (j >= 32) {
- word1(rv) = 0;
- if (j >= 53)
- word0(rv) = (P+2)*Exp_msk1;
- else
- word0(rv) &= 0xffffffff << (j-32);
- }
- else
- word1(rv) &= 0xffffffff << j;
- }
- #else
- for (j = 0; e1 > 1; j++, e1 >>= 1)
- if (e1 & 1)
- dval(rv) *= tinytens[j];
- /* The last multiplication could underflow. */
- dval(rv0) = dval(rv);
- dval(rv) *= tinytens[j];
- if (!dval(rv)) {
- dval(rv) = 2.*dval(rv0);
- dval(rv) *= tinytens[j];
- #endif
- if (!dval(rv)) {
- undfl:
- dval(rv) = 0.;
- #ifndef NO_ERRNO
- errno = ERANGE;
- #endif
- if (bd0)
- goto retfree;
- goto ret;
- }
- #ifndef Avoid_Underflow
- word0(rv) = Tiny0;
- word1(rv) = Tiny1;
- /* The refinement below will clean
- * this approximation up.
- */
- }
- #endif
- }
- }
- /* Now the hard part -- adjusting rv to the correct value.*/
- /* Put digits into bd: true value = bd * 10^e */
- bd0 = s2b(s0, nd0, nd, y);
- for (;;) {
- bd = Balloc(bd0->k);
- Bcopy(bd, bd0);
- bb = d2b(dval(rv), &bbe, &bbbits); /* rv = bb * 2^bbe */
- bs = i2b(1);
- if (e >= 0) {
- bb2 = bb5 = 0;
- bd2 = bd5 = e;
- }
- else {
- bb2 = bb5 = -e;
- bd2 = bd5 = 0;
- }
- if (bbe >= 0)
- bb2 += bbe;
- else
- bd2 -= bbe;
- bs2 = bb2;
- #ifdef Honor_FLT_ROUNDS
- if (rounding != 1)
- bs2++;
- #endif
- #ifdef Avoid_Underflow
- j = bbe - scale;
- i = j + bbbits - 1; /* logb(rv) */
- if (i < Emin) /* denormal */
- j += P - Emin;
- else
- j = P + 1 - bbbits;
- #else /*Avoid_Underflow*/
- #ifdef Sudden_Underflow
- #ifdef IBM
- j = 1 + 4*P - 3 - bbbits + ((bbe + bbbits - 1) & 3);
- #else
- j = P + 1 - bbbits;
- #endif
- #else /*Sudden_Underflow*/
- j = bbe;
- i = j + bbbits - 1; /* logb(rv) */
- if (i < Emin) /* denormal */
- j += P - Emin;
- else
- j = P + 1 - bbbits;
- #endif /*Sudden_Underflow*/
- #endif /*Avoid_Underflow*/
- bb2 += j;
- bd2 += j;
- #ifdef Avoid_Underflow
- bd2 += scale;
- #endif
- i = bb2 < bd2 ? bb2 : bd2;
- if (i > bs2)
- i = bs2;
- if (i > 0) {
- bb2 -= i;
- bd2 -= i;
- bs2 -= i;
- }
- if (bb5 > 0) {
- bs = pow5mult(bs, bb5);
- bb1 = mult(bs, bb);
- Bfree(bb);
- bb = bb1;
- }
- if (bb2 > 0)
- bb = lshift(bb, bb2);
- if (bd5 > 0)
- bd = pow5mult(bd, bd5);
- if (bd2 > 0)
- bd = lshift(bd, bd2);
- if (bs2 > 0)
- bs = lshift(bs, bs2);
- delta = diff(bb, bd);
- dsign = delta->sign;
- delta->sign = 0;
- i = cmp(delta, bs);
- #ifdef Honor_FLT_ROUNDS
- if (rounding != 1) {
- if (i < 0) {
- /* Error is less than an ulp */
- if (!delta->x[0] && delta->wds <= 1) {
- /* exact */
- #ifdef SET_INEXACT
- inexact = 0;
- #endif
- break;
- }
- if (rounding) {
- if (dsign) {
- adj = 1.;
- goto apply_adj;
- }
- }
- else if (!dsign) {
- adj = -1.;
- if (!word1(rv)
- && !(word0(rv) & Frac_mask)) {
- y = word0(rv) & Exp_mask;
- #ifdef Avoid_Underflow
- if (!scale || y > 2*P*Exp_msk1)
- #else
- if (y)
- #endif
- {
- delta = lshift(delta,Log2P);
- if (cmp(delta, bs) <= 0)
- adj = -0.5;
- }
- }
- apply_adj:
- #ifdef Avoid_Underflow
- if (scale && (y = word0(rv) & Exp_mask)
- <= 2*P*Exp_msk1)
- word0(adj) += (2*P+1)*Exp_msk1 - y;
- #else
- #ifdef Sudden_Underflow
- if ((word0(rv) & Exp_mask) <=
- P*Exp_msk1) {
- word0(rv) += P*Exp_msk1;
- dval(rv) += adj*ulp(dval(rv));
- word0(rv) -= P*Exp_msk1;
- }
- else
- #endif /*Sudden_Underflow*/
- #endif /*Avoid_Underflow*/
- dval(rv) += adj*ulp(dval(rv));
- }
- break;
- }
- adj = ratio(delta, bs);
- if (adj < 1.)
- adj = 1.;
- if (adj <= 0x7ffffffe) {
- /* adj = rounding ? ceil(adj) : floor(adj); */
- y = adj;
- if (y != adj) {
- if (!((rounding>>1) ^ dsign))
- y++;
- adj = y;
- }
- }
- #ifdef Avoid_Underflow
- if (scale && (y = word0(rv) & Exp_mask) <= 2*P*Exp_msk1)
- word0(adj) += (2*P+1)*Exp_msk1 - y;
- #else
- #ifdef Sudden_Underflow
- if ((word0(rv) & Exp_mask) <= P*Exp_msk1) {
- word0(rv) += P*Exp_msk1;
- adj *= ulp(dval(rv));
- if (dsign)
- dval(rv) += adj;
- else
- dval(rv) -= adj;
- word0(rv) -= P*Exp_msk1;
- goto cont;
- }
- #endif /*Sudden_Underflow*/
- #endif /*Avoid_Underflow*/
- adj *= ulp(dval(rv));
- if (dsign)
- dval(rv) += adj;
- else
- dval(rv) -= adj;
- goto cont;
- }
- #endif /*Honor_FLT_ROUNDS*/
- if (i < 0) {
- /* Error is less than half an ulp -- check for
- * special case of mantissa a power of two.
- */
- if (dsign || word1(rv) || word0(rv) & Bndry_mask
- #ifdef IEEE_Arith
- #ifdef Avoid_Underflow
- || (word0(rv) & Exp_mask) <= (2*P+1)*Exp_msk1
- #else
- || (word0(rv) & Exp_mask) <= Exp_msk1
- #endif
- #endif
- ) {
- #ifdef SET_INEXACT
- if (!delta->x[0] && delta->wds <= 1)
- inexact = 0;
- #endif
- break;
- }
- if (!delta->x[0] && delta->wds <= 1) {
- /* exact result */
- #ifdef SET_INEXACT
- inexact = 0;
- #endif
- break;
- }
- delta = lshift(delta,Log2P);
- if (cmp(delta, bs) > 0)
- goto drop_down;
- break;
- }
- if (i == 0) {
- /* exactly half-way between */
- if (dsign) {
- if ((word0(rv) & Bndry_mask1) == Bndry_mask1
- && word1(rv) == (
- #ifdef Avoid_Underflow
- (scale && (y = word0(rv) & Exp_mask) <= 2*P*Exp_msk1)
- ? (0xffffffff & (0xffffffff << (2*P+1-(y>>Exp_shift)))) :
- #endif
- 0xffffffff)) {
- /*boundary case -- increment exponent*/
- word0(rv) = (word0(rv) & Exp_mask)
- + Exp_msk1
- #ifdef IBM
- | Exp_msk1 >> 4
- #endif
- ;
- word1(rv) = 0;
- #ifdef Avoid_Underflow
- dsign = 0;
- #endif
- break;
- }
- }
- else if (!(word0(rv) & Bndry_mask) && !word1(rv)) {
- drop_down:
- /* boundary case -- decrement exponent */
- #ifdef Sudden_Underflow /*{{*/
- L = word0(rv) & Exp_mask;
- #ifdef IBM
- if (L < Exp_msk1)
- #else
- #ifdef Avoid_Underflow
- if (L <= (scale ? (2*P+1)*Exp_msk1 : Exp_msk1))
- #else
- if (L <= Exp_msk1)
- #endif /*Avoid_Underflow*/
- #endif /*IBM*/
- goto undfl;
- L -= Exp_msk1;
- #else /*Sudden_Underflow}{*/
- #ifdef Avoid_Underflow
- if (scale) {
- L = word0(rv) & Exp_mask;
- if (L <= (2*P+1)*Exp_msk1) {
- if (L > (P+2)*Exp_msk1)
- /* round even ==> */
- /* accept rv */
- break;
- /* rv = smallest denormal */
- goto undfl;
- }
- }
- #endif /*Avoid_Underflow*/
- L = (word0(rv) & Exp_mask) - Exp_msk1;
- #endif /*Sudden_Underflow}}*/
- word0(rv) = L | Bndry_mask1;
- word1(rv) = 0xffffffff;
- #ifdef IBM
- goto cont;
- #else
- break;
- #endif
- }
- #ifndef ROUND_BIASED
- if (!(word1(rv) & LSB))
- break;
- #endif
- if (dsign)
- dval(rv) += ulp(dval(rv));
- #ifndef ROUND_BIASED
- else {
- dval(rv) -= ulp(dval(rv));
- #ifndef Sudden_Underflow
- if (!dval(rv))
- goto undfl;
- #endif
- }
- #ifdef Avoid_Underflow
- dsign = 1 - dsign;
- #endif
- #endif
- break;
- }
- if ((aadj = ratio(delta, bs)) <= 2.) {
- if (dsign)
- aadj = dval(aadj1) = 1.;
- else if (word1(rv) || word0(rv) & Bndry_mask) {
- #ifndef Sudden_Underflow
- if (word1(rv) == Tiny1 && !word0(rv))
- goto undfl;
- #endif
- aadj = 1.;
- dval(aadj1) = -1.;
- }
- else {
- /* special case -- power of FLT_RADIX to be */
- /* rounded down... */
- if (aadj < 2./FLT_RADIX)
- aadj = 1./FLT_RADIX;
- else
- aadj *= 0.5;
- dval(aadj1) = -aadj;
- }
- }
- else {
- aadj *= 0.5;
- dval(aadj1) = dsign ? aadj : -aadj;
- #ifdef Check_FLT_ROUNDS
- switch (Rounding) {
- case 2: /* towards +infinity */
- dval(aadj1) -= 0.5;
- break;
- case 0: /* towards 0 */
- case 3: /* towards -infinity */
- dval(aadj1) += 0.5;
- }
- #else
- if (Flt_Rounds == 0)
- dval(aadj1) += 0.5;
- #endif /*Check_FLT_ROUNDS*/
- }
- y = word0(rv) & Exp_mask;
- /* Check for overflow */
- if (y == Exp_msk1*(DBL_MAX_EXP+Bias-1)) {
- dval(rv0) = dval(rv);
- word0(rv) -= P*Exp_msk1;
- adj = dval(aadj1) * ulp(dval(rv));
- dval(rv) += adj;
- if ((word0(rv) & Exp_mask) >=
- Exp_msk1*(DBL_MAX_EXP+Bias-P)) {
- if (word0(rv0) == Big0 && word1(rv0) == Big1)
- goto ovfl;
- word0(rv) = Big0;
- word1(rv) = Big1;
- goto cont;
- }
- else
- word0(rv) += P*Exp_msk1;
- }
- else {
- #ifdef Avoid_Underflow
- if (scale && y <= 2*P*Exp_msk1) {
- if (aadj <= 0x7fffffff) {
- if ((z = (int)aadj) <= 0)
- z = 1;
- aadj = z;
- dval(aadj1) = dsign ? aadj : -aadj;
- }
- word0(aadj1) += (2*P+1)*Exp_msk1 - y;
- }
- adj = dval(aadj1) * ulp(dval(rv));
- dval(rv) += adj;
- #else
- #ifdef Sudden_Underflow
- if ((word0(rv) & Exp_mask) <= P*Exp_msk1) {
- dval(rv0) = dval(rv);
- word0(rv) += P*Exp_msk1;
- adj = dval(aadj1) * ulp(dval(rv));
- dval(rv) += adj;
- #ifdef IBM
- if ((word0(rv) & Exp_mask) < P*Exp_msk1)
- #else
- if ((word0(rv) & Exp_mask) <= P*Exp_msk1)
- #endif
- {
- if (word0(rv0) == Tiny0 && word1(rv0) == Tiny1)
- goto undfl;
- word0(rv) = Tiny0;
- word1(rv) = Tiny1;
- goto cont;
- }
- else
- word0(rv) -= P*Exp_msk1;
- }
- else {
- adj = dval(aadj1) * ulp(dval(rv));
- dval(rv) += adj;
- }
- #else /*Sudden_Underflow*/
- /* Compute adj so that the IEEE rounding rules will
- * correctly round rv + adj in some half-way cases.
- * If rv * ulp(rv) is denormalized (i.e.,
- * y <= (P-1)*Exp_msk1), we must adjust aadj to avoid
- * trouble from bits lost to denormalization;
- * example: 1.2e-307 .
- */
- if (y <= (P-1)*Exp_msk1 && aadj > 1.) {
- dval(aadj1) = (double)(int)(aadj + 0.5);
- if (!dsign)
- dval(aadj1) = -dval(aadj1);
- }
- adj = dval(aadj1) * ulp(dval(rv));
- dval(rv) += adj;
- #endif /*Sudden_Underflow*/
- #endif /*Avoid_Underflow*/
- }
- z = word0(rv) & Exp_mask;
- #ifndef SET_INEXACT
- #ifdef Avoid_Underflow
- if (!scale)
- #endif
- if (y == z) {
- /* Can we stop now? */
- L = (Long)aadj;
- aadj -= L;
- /* The tolerances below are conservative. */
- if (dsign || word1(rv) || word0(rv) & Bndry_mask) {
- if (aadj < .4999999 || aadj > .5000001)
- break;
- }
- else if (aadj < .4999999/FLT_RADIX)
- break;
- }
- #endif
- cont:
- Bfree(bb);
- Bfree(bd);
- Bfree(bs);
- Bfree(delta);
- }
- #ifdef SET_INEXACT
- if (inexact) {
- if (!oldinexact) {
- word0(rv0) = Exp_1 + (70 << Exp_shift);
- word1(rv0) = 0;
- dval(rv0) += 1.;
- }
- }
- else if (!oldinexact)
- clear_inexact();
- #endif
- #ifdef Avoid_Underflow
- if (scale) {
- word0(rv0) = Exp_1 - 2*P*Exp_msk1;
- word1(rv0) = 0;
- dval(rv) *= dval(rv0);
- #ifndef NO_ERRNO
- /* try to avoid the bug of testing an 8087 register value */
- if (word0(rv) == 0 && word1(rv) == 0)
- errno = ERANGE;
- #endif
- }
- #endif /* Avoid_Underflow */
- #ifdef SET_INEXACT
- if (inexact && !(word0(rv) & Exp_mask)) {
- /* set underflow bit */
- dval(rv0) = 1e-300;
- dval(rv0) *= dval(rv0);
- }
- #endif
- retfree:
- Bfree(bb);
- Bfree(bd);
- Bfree(bs);
- Bfree(bd0);
- Bfree(delta);
- ret:
- if (se)
- *se = (char *)s;
- return sign ? -dval(rv) : dval(rv);
- }
- static int
- quorem(Bigint *b, Bigint *S)
- {
- int n;
- ULong *bx, *bxe, q, *sx, *sxe;
- #ifdef ULLong
- ULLong borrow, carry, y, ys;
- #else
- ULong borrow, carry, y, ys;
- #ifdef Pack_32
- ULong si, z, zs;
- #endif
- #endif
- n = S->wds;
- #ifdef DEBUG
- /*debug*/ if (b->wds > n)
- /*debug*/ Bug("oversize b in quorem");
- #endif
- if (b->wds < n)
- return 0;
- sx = S->x;
- sxe = sx + --n;
- bx = b->x;
- bxe = bx + n;
- q = *bxe / (*sxe + 1); /* ensure q <= true quotient */
- #ifdef DEBUG
- /*debug*/ if (q > 9)
- /*debug*/ Bug("oversized quotient in quorem");
- #endif
- if (q) {
- borrow = 0;
- carry = 0;
- do {
- #ifdef ULLong
- ys = *sx++ * (ULLong)q + carry;
- carry = ys >> 32;
- y = *bx - (ys & FFFFFFFF) - borrow;
- borrow = y >> 32 & (ULong)1;
- *bx++ = (ULong)(y & FFFFFFFF);
- #else
- #ifdef Pack_32
- si = *sx++;
- ys = (si & 0xffff) * q + carry;
- zs = (si >> 16) * q + (ys >> 16);
- carry = zs >> 16;
- y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- z = (*bx >> 16) - (zs & 0xffff) - borrow;
- borrow = (z & 0x10000) >> 16;
- Storeinc(bx, z, y);
- #else
- ys = *sx++ * q + carry;
- carry = ys >> 16;
- y = *bx - (ys & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- *bx++ = y & 0xffff;
- #endif
- #endif
- } while (sx <= sxe);
- if (!*bxe) {
- bx = b->x;
- while (--bxe > bx && !*bxe)
- --n;
- b->wds = n;
- }
- }
- if (cmp(b, S) >= 0) {
- q++;
- borrow = 0;
- carry = 0;
- bx = b->x;
- sx = S->x;
- do {
- #ifdef ULLong
- ys = *sx++ + carry;
- carry = ys >> 32;
- y = *bx - (ys & FFFFFFFF) - borrow;
- borrow = y >> 32 & (ULong)1;
- *bx++ = (ULong)(y & FFFFFFFF);
- #else
- #ifdef Pack_32
- si = *sx++;
- ys = (si & 0xffff) + carry;
- zs = (si >> 16) + (ys >> 16);
- carry = zs >> 16;
- y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- z = (*bx >> 16) - (zs & 0xffff) - borrow;
- borrow = (z & 0x10000) >> 16;
- Storeinc(bx, z, y);
- #else
- ys = *sx++ + carry;
- carry = ys >> 16;
- y = *bx - (ys & 0xffff) - borrow;
- borrow = (y & 0x10000) >> 16;
- *bx++ = y & 0xffff;
- #endif
- #endif
- } while (sx <= sxe);
- bx = b->x;
- bxe = bx + n;
- if (!*bxe) {
- while (--bxe > bx && !*bxe)
- --n;
- b->wds = n;
- }
- }
- return q;
- }
- #ifndef MULTIPLE_THREADS
- static char *dtoa_result;
- #endif
- #ifndef MULTIPLE_THREADS
- static char *
- rv_alloc(int i)
- {
- return dtoa_result = xmalloc(i);
- }
- #else
- #define rv_alloc(i) xmalloc(i)
- #endif
- static char *
- nrv_alloc(const char *s, char **rve, size_t n)
- {
- char *rv, *t;
- t = rv = rv_alloc(n);
- while ((*t = *s++) != 0) t++;
- if (rve)
- *rve = t;
- return rv;
- }
- #define rv_strdup(s, rve) nrv_alloc(s, rve, strlen(s)+1)
- #ifndef MULTIPLE_THREADS
- /* freedtoa(s) must be used to free values s returned by dtoa
- * when MULTIPLE_THREADS is #defined. It should be used in all cases,
- * but for consistency with earlier versions of dtoa, it is optional
- * when MULTIPLE_THREADS is not defined.
- */
- static void
- freedtoa(char *s)
- {
- xfree(s);
- }
- #endif
- static const char INFSTR[] = "Infinity";
- static const char NANSTR[] = "NaN";
- static const char ZEROSTR[] = "0";
- /* dtoa for IEEE arithmetic (dmg): convert double to ASCII string.
- *
- * Inspired by "How to Print Floating-Point Numbers Accurately" by
- * Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 112-126].
- *
- * Modifications:
- * 1. Rather than iterating, we use a simple numeric overestimate
- * to determine k = floor(log10(d)). We scale relevant
- * quantities using O(log2(k)) rather than O(k) multiplications.
- * 2. For some modes > 2 (corresponding to ecvt and fcvt), we don't
- * try to generate digits strictly left to right. Instead, we
- * compute with fewer bits and propagate the carry if necessary
- * when rounding the final digit up. This is often faster.
- * 3. Under the assumption that input will be rounded nearest,
- * mode 0 renders 1e23 as 1e23 rather than 9.999999999999999e22.
- * That is, we allow equality in stopping tests when the
- * round-nearest rule will give the same floating-point value
- * as would satisfaction of the stopping test with strict
- * inequality.
- * 4. We remove common factors of powers of 2 from relevant
- * quantities.
- * 5. When converting floating-point integers less than 1e16,
- * we use floating-point arithmetic rather than resorting
- * to multiple-precision integers.
- * 6. When asked to produce fewer than 15 digits, we first try
- * to get by with floating-point arithmetic; we resort to
- * multiple-precision integer arithmetic only if we cannot
- * guarantee that the floating-point calculation has given
- * the correctly rounded result. For k requested digits and
- * "uniformly" distributed input, the probability is
- * something like 10^(k-15) that we must resort to the Long
- * calculation.
- */
- char *
- ruby_dtoa(double d_, int mode, int ndigits, int *decpt, int *sign, char **rve)
- {
- /* Arguments ndigits, decpt, sign are similar to those
- of ecvt and fcvt; trailing zeros are suppressed from
- the returned string. If not null, *rve is set to point
- to the end of the return value. If d is +-Infinity or NaN,
- then *decpt is set to 9999.
- mode:
- 0 ==> shortest string that yields d when read in
- and rounded to nearest.
- 1 ==> like 0, but with Steele & White stopping rule;
- e.g. with IEEE P754 arithmetic , mode 0 gives
- 1e23 whereas mode 1 gives 9.999999999999999e22.
- 2 ==> max(1,ndigits) significant digits. This gives a
- return value similar to that of ecvt, except
- that trailing zeros are suppressed.
- 3 ==> through ndigits past the decimal point. This
- gives a return value similar to that from fcvt,
- except that trailing zeros are suppressed, and
- ndigits can be negative.
- 4,5 ==> similar to 2 and 3, respectively, but (in
- round-nearest mode) with the tests of mode 0 to
- possibly return a shorter string that rounds to d.
- With IEEE arithmetic and compilation with
- -DHonor_FLT_ROUNDS, modes 4 and 5 behave the same
- as modes 2 and 3 when FLT_ROUNDS != 1.
- 6-9 ==> Debugging modes similar to mode - 4: don't try
- fast floating-point estimate (if applicable).
- Values of mode other than 0-9 are treated as mode 0.
- Sufficient space is allocated to the return value
- to hold the suppressed trailing zeros.
- */
- int bbits, b2, b5, be, dig, i, ieps, ilim, ilim0, ilim1,
- j, j1, k, k0, k_check, leftright, m2, m5, s2, s5,
- spec_case, try_quick;
- Long L;
- #ifndef Sudden_Underflow
- int denorm;
- ULong x;
- #endif
- Bigint *b, *b1, *delta, *mlo = 0, *mhi = 0, *S;
- double ds;
- double_u d, d2, eps;
- char *s, *s0;
- #ifdef Honor_FLT_ROUNDS
- int rounding;
- #endif
- #ifdef SET_INEXACT
- int inexact, oldinexact;
- #endif
- dval(d) = d_;
- #ifndef MULTIPLE_THREADS
- if (dtoa_result) {
- freedtoa(dtoa_result);
- dtoa_result = 0;
- }
- #endif
- if (word0(d) & Sign_bit) {
- /* set sign for everything, including 0's and NaNs */
- *sign = 1;
- word0(d) &= ~Sign_bit; /* clear sign bit */
- }
- else
- *sign = 0;
- #if defined(IEEE_Arith) + defined(VAX)
- #ifdef IEEE_Arith
- if ((word0(d) & Exp_mask) == Exp_mask)
- #else
- if (word0(d) == 0x8000)
- #endif
- {
- /* Infinity or NaN */
- *decpt = 9999;
- #ifdef IEEE_Arith
- if (!word1(d) && !(word0(d) & 0xfffff))
- return rv_strdup(INFSTR, rve);
- #endif
- return rv_strdup(NANSTR, rve);
- }
- #endif
- #ifdef IBM
- dval(d) += 0; /* normalize */
- #endif
- if (!dval(d)) {
- *decpt = 1;
- return rv_strdup(ZEROSTR, rve);
- }
- #ifdef SET_INEXACT
- try_quick = oldinexact = get_inexact();
- inexact = 1;
- #endif
- #ifdef Honor_FLT_ROUNDS
- if ((rounding = Flt_Rounds) >= 2) {
- if (*sign)
- rounding = rounding == 2 ? 0 : 2;
- else
- if (rounding != 2)
- rounding = 0;
- }
- #endif
- b = d2b(dval(d), &be, &bbits);
- #ifdef Sudden_Underflow
- i = (int)(word0(d) >> Exp_shift1 & (Exp_mask>>Exp_shift1));
- #else
- if ((i = (int)(word0(d) >> Exp_shift1 & (Exp_mask>>Exp_shift1))) != 0) {
- #endif
- dval(d2) = dval(d);
- word0(d2) &= Frac_mask1;
- word0(d2) |= Exp_11;
- #ifdef IBM
- if (j = 11 - hi0bits(word0(d2) & Frac_mask))
- dval(d2) /= 1 << j;
- #endif
- /* log(x) ~=~ log(1.5) + (x-1.5)/1.5
- * log10(x) = log(x) / log(10)
- * ~=~ log(1.5)/log(10) + (x-1.5)/(1.5*log(10))
- * log10(d) = (i-Bias)*log(2)/log(10) + log10(d2)
- *
- * This suggests computing an approximation k to log10(d) by
- *
- * k = (i - Bias)*0.301029995663981
- * + ( (d2-1.5)*0.289529654602168 + 0.176091259055681 );
- *
- * We want k to be too large rather than too small.
- * The error in the first-order Taylor series approximation
- * is in our favor, so we just round up the constant enough
- * to compensate for any error in the multiplication of
- * (i - Bias) by 0.301029995663981; since |i - Bias| <= 1077,
- * and 1077 * 0.30103 * 2^-52 ~=~ 7.2e-14,
- * adding 1e-13 to the constant term more than suffices.
- * Hence we adjust the constant term to 0.1760912590558.
- * (We could get a more accurate k by invoking log10,
- * but this is probably not worthwhile.)
- */
- i -= Bias;
- #ifdef IBM
- i <<= 2;
- i += j;
- #endif
- #ifndef Sudden_Underflow
- denorm = 0;
- }
- else {
- /* d is denormalized */
- i = bbits + be + (Bias + (P-1) - 1);
- x = i > 32 ? word0(d) << (64 - i) | word1(d) >> (i - 32)
- : word1(d) << (32 - i);
- dval(d2) = x;
- word0(d2) -= 31*Exp_msk1; /* adjust exponent */
- i -= (Bias + (P-1) - 1) + 1;
- denorm = 1;
- }
- #endif
- ds = (dval(d2)-1.5)*0.289529654602168 + 0.1760912590558 + i*0.301029995663981;
- k = (int)ds;
- if (ds < 0. && ds != k)
- k--; /* want k = floor(ds) */
- k_check = 1;
- if (k >= 0 && k <= Ten_pmax) {
- if (dval(d) < tens[k])
- k--;
- k_check = 0;
- }
- j = bbits - i - 1;
- if (j >= 0) {
- b2 = 0;
- s2 = j;
- }
- else {
- b2 = -j;
- s2 = 0;
- }
- if (k >= 0) {
- b5 = 0;
- s5 = k;
- s2 += k;
- }
- else {
- b2 -= k;
- b5 = -k;
- s5 = 0;
- }
- if (mode < 0 || mode > 9)
- mode = 0;
- #ifndef SET_INEXACT
- #ifdef Check_FLT_ROUNDS
- try_quick = Rounding == 1;
- #else
- try_quick = 1;
- #endif
- #endif /*SET_INEXACT*/
- if (mode > 5) {
- mode -= 4;
- try_quick = 0;
- }
- leftright = 1;
- ilim = ilim1 = -1;
- switch (mode) {
- case 0:
- case 1:
- i = 18;
- ndigits = 0;
- break;
- case 2:
- leftright = 0;
- /* no break */
- case 4:
- if (ndigits <= 0)
- ndigits = 1;
- ilim = ilim1 = i = ndigits;
- break;
- case 3:
- leftright = 0;
- /* no break */
- case 5:
- i = ndigits + k + 1;
- ilim = i;
- ilim1 = i - 1;
- if (i <= 0)
- i = 1;
- }
- s = s0 = rv_alloc(i+1);
- #ifdef Honor_FLT_ROUNDS
- if (mode > 1 && rounding != 1)
- leftright = 0;
- #endif
- if (ilim >= 0 && ilim <= Quick_max && try_quick) {
- /* Try to get by with floating-point arithmetic. */
- i = 0;
- dval(d2) = dval(d);
- k0 = k;
- ilim0 = ilim;
- ieps = 2; /* conservative */
- if (k > 0) {
- ds = tens[k&0xf];
- j = k >> 4;
- if (j & Bletch) {
- /* prevent overflows */
- j &= Bletch - 1;
- dval(d) /= bigtens[n_bigtens-1];
- ieps++;
- }
- for (; j; j >>= 1, i++)
- if (j & 1) {
- ieps++;
- ds *= bigtens[i];
- }
- dval(d) /= ds;
- }
- else if ((j1 = -k) != 0) {
- dval(d) *= tens[j1 & 0xf];
- for (j = j1 >> 4; j; j >>= 1, i++)
- if (j & 1) {
- ieps++;
- dval(d) *= bigtens[i];
- }
- }
- if (k_check && dval(d) < 1. && ilim > 0) {
- if (ilim1 <= 0)
- goto fast_failed;
- ilim = ilim1;
- k--;
- dval(d) *= 10.;
- ieps++;
- }
- dval(eps) = ieps*dval(d) + 7.;
- word0(eps) -= (P-1)*Exp_msk1;
- if (ilim == 0) {
- S = mhi = 0;
- dval(d) -= 5.;
- if (dval(d) > dval(eps))
- goto one_digit;
- if (dval(d) < -dval(eps))
- goto no_digits;
- goto fast_failed;
- }
- #ifndef No_leftright
- if (leftright) {
- /* Use Steele & White method of only
- * generating digits needed.
- */
- dval(eps) = 0.5/tens[ilim-1] - dval(eps);
- for (i = 0;;) {
- L = (int)dval(d);
- dval(d) -= L;
- *s++ = '0' + (int)L;
- if (dval(d) < dval(eps))
- goto ret1;
- if (1. - dval(d) < dval(eps))
- goto bump_up;
- if (++i >= ilim)
- break;
- dval(eps) *= 10.;
- dval(d) *= 10.;
- }
- }
- else {
- #endif
- /* Generate ilim digits, then fix them up. */
- dval(eps) *= tens[ilim-1];
- for (i = 1;; i++, dval(d) *= 10.) {
- L = (Long)(dval(d));
- if (!(dval(d) -= L))
- ilim = i;
- *s++ = '0' + (int)L;
- if (i == ilim) {
- if (dval(d) > 0.5 + dval(eps))
- goto bump_up;
- else if (dval(d) < 0.5 - dval(eps)) {
- while (*--s == '0') ;
- s++;
- goto ret1;
- }
- break;
- }
- }
- #ifndef No_leftright
- }
- #endif
- fast_failed:
- s = s0;
- dval(d) = dval(d2);
- k = k0;
- ilim = ilim0;
- }
- /* Do we have a "small" integer? */
- if (be >= 0 && k <= Int_max) {
- /* Yes. */
- ds = tens[k];
- if (ndigits < 0 && ilim <= 0) {
- S = mhi = 0;
- if (ilim < 0 || dval(d) <= 5*ds)
- goto no_digits;
- goto one_digit;
- }
- for (i = 1;; i++, dval(d) *= 10.) {
- L = (Long)(dval(d) / ds);
- dval(d) -= L*ds;
- #ifdef Check_FLT_ROUNDS
- /* If FLT_ROUNDS == 2, L will usually be high by 1 */
- if (dval(d) < 0) {
- L--;
- dval(d) += ds;
- }
- #endif
- *s++ = '0' + (int)L;
- if (!dval(d)) {
- #ifdef SET_INEXACT
- inexact = 0;
- #endif
- break;
- }
- if (i == ilim) {
- #ifdef Honor_FLT_ROUNDS
- if (mode > 1)
- switch (rounding) {
- case 0: goto ret1;
- case 2: goto bump_up;
- }
- #endif
- dval(d) += dval(d);
- if (dval(d) > ds || (dval(d) == ds && (L & 1))) {
- bump_up:
- while (*--s == '9')
- if (s == s0) {
- k++;
- *s = '0';
- break;
- }
- ++*s++;
- }
- break;
- }
- }
- goto ret1;
- }
- m2 = b2;
- m5 = b5;
- if (leftright) {
- i =
- #ifndef Sudden_Underflow
- denorm ? be + (Bias + (P-1) - 1 + 1) :
- #endif
- #ifdef IBM
- 1 + 4*P - 3 - bbits + ((bbits + be - 1) & 3);
- #else
- 1 + P - bbits;
- #endif
- b2 += i;
- s2 += i;
- mhi = i2b(1);
- }
- if (m2 > 0 && s2 > 0) {
- i = m2 < s2 ? m2 : s2;
- b2 -= i;
- m2 -= i;
- s2 -= i;
- }
- if (b5 > 0) {
- if (leftright) {
- if (m5 > 0) {
- mhi = pow5mult(mhi, m5);
- b1 = mult(mhi, b);
- Bfree(b);
- b = b1;
- }
- if ((j = b5 - m5) != 0)
- b = pow5mult(b, j);
- }
- else
- b = pow5mult(b, b5);
- }
- S = i2b(1);
- if (s5 > 0)
- S = pow5mult(S, s5);
- /* Check for special case that d is a normalized power of 2. */
- spec_case = 0;
- if ((mode < 2 || leftright)
- #ifdef Honor_FLT_ROUNDS
- && rounding == 1
- #endif
- ) {
- if (!word1(d) && !(word0(d) & Bndry_mask)
- #ifndef Sudden_Underflow
- && word0(d) & (Exp_mask & ~Exp_msk1)
- #endif
- ) {
- /* The special case */
- b2 += Log2P;
- s2 += Log2P;
- spec_case = 1;
- }
- }
- /* Arrange for convenient computation of quotients:
- * shift left if necessary so divisor has 4 leading 0 bits.
- *
- * Perhaps we should just compute leading 28 bits of S once
- * and for all and pass them and a shift to quorem, so it
- * can do shifts and ors to compute the numerator for q.
- */
- #ifdef Pack_32
- if ((i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0x1f) != 0)
- i = 32 - i;
- #else
- if ((i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0xf) != 0)
- i = 16 - i;
- #endif
- if (i > 4) {
- i -= 4;
- b2 += i;
- m2 += i;
- s2 += i;
- }
- else if (i < 4) {
- i += 28;
- b2 += i;
- m2 += i;
- s2 += i;
- }
- if (b2 > 0)
- b = lshift(b, b2);
- if (s2 > 0)
- S = lshift(S, s2);
- if (k_check) {
- if (cmp(b,S) < 0) {
- k--;
- b = multadd(b, 10, 0); /* we botched the k estimate */
- if (leftright)
- mhi = multadd(mhi, 10, 0);
- ilim = ilim1;
- }
- }
- if (ilim <= 0 && (mode == 3 || mode == 5)) {
- if (ilim < 0 || cmp(b,S = multadd(S,5,0)) <= 0) {
- /* no digits, fcvt style */
- no_digits:
- k = -1 - ndigits;
- goto ret;
- }
- one_digit:
- *s++ = '1';
- k++;
- goto ret;
- }
- if (leftright) {
- if (m2 > 0)
- mhi = lshift(mhi, m2);
- /* Compute mlo -- check for special case
- * that d is a normalized power of 2.
- */
- mlo = mhi;
- if (spec_case) {
- mhi = Balloc(mhi->k);
- Bcopy(mhi, mlo);
- mhi = lshift(mhi, Log2P);
- }
- for (i = 1;;i++) {
- dig = quorem(b,S) + '0';
- /* Do we yet have the shortest decimal string
- * that will round to d?
- */
- j = cmp(b, mlo);
- delta = diff(S, mhi);
- j1 = delta->sign ? 1 : cmp(b, delta);
- Bfree(delta);
- #ifndef ROUND_BIASED
- if (j1 == 0 && mode != 1 && !(word1(d) & 1)
- #ifdef Honor_FLT_ROUNDS
- && rounding >= 1
- #endif
- ) {
- if (dig == '9')
- goto round_9_up;
- if (j > 0)
- dig++;
- #ifdef SET_INEXACT
- else if (!b->x[0] && b->wds <= 1)
- inexact = 0;
- #endif
- *s++ = dig;
- goto ret;
- }
- #endif
- if (j < 0 || (j == 0 && mode != 1
- #ifndef ROUND_BIASED
- && !(word1(d) & 1)
- #endif
- )) {
- if (!b->x[0] && b->wds <= 1) {
- #ifdef SET_INEXACT
- inexact = 0;
- #endif
- goto accept_dig;
- }
- #ifdef Honor_FLT_ROUNDS
- if (mode > 1)
- switch (rounding) {
- case 0: goto accept_dig;
- case 2: goto keep_dig;
- }
- #endif /*Honor_FLT_ROUNDS*/
- if (j1 > 0) {
- b = lshift(b, 1);
- j1 = cmp(b, S);
- if ((j1 > 0 || (j1 == 0 && (dig & 1))) && dig++ == '9')
- goto round_9_up;
- }
- accept_dig:
- *s++ = dig;
- goto ret;
- }
- if (j1 > 0) {
- #ifdef Honor_FLT_ROUNDS
- if (!rounding)
- goto accept_dig;
- #endif
- if (dig == '9') { /* possible if i == 1 */
- round_9_up:
- *s++ = '9';
- goto roundoff;
- }
- *s++ = dig + 1;
- goto ret;
- }
- #ifdef Honor_FLT_ROUNDS
- keep_dig:
- #endif
- *s++ = dig;
- if (i == ilim)
- break;
- b = multadd(b, 10, 0);
- if (mlo == mhi)
- mlo = mhi = multadd(mhi, 10, 0);
- else {
- mlo = multadd(mlo, 10, 0);
- mhi = multadd(mhi, 10, 0);
- }
- }
- }
- else
- for (i = 1;; i++) {
- *s++ = dig = quorem(b,S) + '0';
- if (!b->x[0] && b->wds <= 1) {
- #ifdef SET_INEXACT
- inexact = 0;
- #endif
- goto ret;
- }
- if (i >= ilim)
- break;
- b = multadd(b, 10, 0);
- }
- /* Round off last digit */
- #ifdef Honor_FLT_ROUNDS
- switch (rounding) {
- case 0: goto trimzeros;
- case 2: goto roundoff;
- }
- #endif
- b = lshift(b, 1);
- j = cmp(b, S);
- if (j > 0 || (j == 0 && (dig & 1))) {
- roundoff:
- while (*--s == '9')
- if (s == s0) {
- k++;
- *s++ = '1';
- goto ret;
- }
- ++*s++;
- }
- else {
- while (*--s == '0') ;
- s++;
- }
- ret:
- Bfree(S);
- if (mhi) {
- if (mlo && mlo != mhi)
- Bfree(mlo);
- Bfree(mhi);
- }
- ret1:
- #ifdef SET_INEXACT
- if (inexact) {
- if (!oldinexact) {
- word0(d) = Exp_1 + (70 << Exp_shift);
- word1(d) = 0;
- dval(d) += 1.;
- }
- }
- else if (!oldinexact)
- clear_inexact();
- #endif
- Bfree(b);
- *s = 0;
- *decpt = k + 1;
- if (rve)
- *rve = s;
- return s0;
- }
- void
- ruby_each_words(const char *str, void (*func)(const char*, int, void*), void *arg)
- {
- const char *end;
- int len;
- if (!str) return;
- for (; *str; str = end) {
- while (ISSPACE(*str) || *str == ',') str++;
- if (!*str) break;
- end = str;
- while (*end && !ISSPACE(*end) && *end != ',') end++;
- len = (int)(end - str); /* assume no string exceeds INT_MAX */
- (*func)(str, len, arg);
- }
- }
- /*-
- * Copyright (c) 2004-2008 David Schultz <das@FreeBSD.ORG>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #define DBL_MANH_SIZE 20
- #define DBL_MANL_SIZE 32
- #define DBL_ADJ (DBL_MAX_EXP - 2)
- #define SIGFIGS ((DBL_MANT_DIG + 3) / 4 + 1)
- #define dexp_get(u) ((int)(word0(u) >> Exp_shift) & ~Exp_msk1)
- #define dexp_set(u,v) (word0(u) = (((int)(word0(u)) & ~Exp_mask) | (v << Exp_shift)))
- #define dmanh_get(u) ((int)(word0(u) & Frac_mask))
- #define dmanl_get(u) ((int)word1(u))
- /*
- * This procedure converts a double-precision number in IEEE format
- * into a string of hexadecimal digits and an exponent of 2. Its
- * behavior is bug-for-bug compatible with dtoa() in mode 2, with the
- * following exceptions:
- *
- * - An ndigits < 0 causes it to use as many digits as necessary to
- * represent the number exactly.
- * - The additional xdigs argument should point to either the string
- * "0123456789ABCDEF" or the string "0123456789abcdef", depending on
- * which case is desired.
- * - This routine does not repeat dtoa's mistake of setting decpt
- * to 9999 in the case of an infinity or NaN. INT_MAX is used
- * for this purpose instead.
- *
- * Note that the C99 standard does not specify what the leading digit
- * should be for non-zero numbers. For instance, 0x1.3p3 is the same
- * as 0x2.6p2 is the same as 0x4.cp3. This implementation always makes
- * the leading digit a 1. This ensures that the exponent printed is the
- * actual base-2 exponent, i.e., ilogb(d).
- *
- * Inputs: d, xdigs, ndigits
- * Outputs: decpt, sign, rve
- */
- char *
- ruby_hdtoa(double d, const char *xdigs, int ndigits, int *decpt, int *sign,
- char **rve)
- {
- U u;
- char *s, *s0;
- int bufsize;
- uint32_t manh, manl;
- u.d = d;
- if (word0(u) & Sign_bit) {
- /* set sign for everything, including 0's and NaNs */
- *sign = 1;
- word0(u) &= ~Sign_bit; /* clear sign bit */
- }
- else
- *sign = 0;
- if (isinf(d)) { /* FP_INFINITE */
- *decpt = INT_MAX;
- return rv_strdup(INFSTR, rve);
- }
- else if (isnan(d)) { /* FP_NAN */
- *decpt = INT_MAX;
- return rv_strdup(NANSTR, rve);
- }
- else if (d == 0.0) { /* FP_ZERO */
- *decpt = 1;
- return rv_strdup(ZEROSTR, rve);
- }
- else if (dexp_get(u)) { /* FP_NORMAL */
- *decpt = dexp_get(u) - DBL_ADJ;
- }
- else { /* FP_SUBNORMAL */
- u.d *= 5.363123171977039e+154 /* 0x1p514 */;
- *decpt = dexp_get(u) - (514 + DBL_ADJ);
- }
- if (ndigits == 0) /* dtoa() compatibility */
- ndigits = 1;
- /*
- * If ndigits < 0, we are expected to auto-size, so we allocate
- * enough space for all the digits.
- */
- bufsize = (ndigits > 0) ? ndigits : SIGFIGS;
- s0 = rv_alloc(bufsize);
- /* Round to the desired number of digits. */
- if (SIGFIGS > ndigits && ndigits > 0) {
- float redux = 1.0f;
- int offset = 4 * ndigits + DBL_MAX_EXP - 4 - DBL_MANT_DIG;
- dexp_set(u, offset);
- u.d += redux;
- u.d -= redux;
- *decpt += dexp_get(u) - offset;
- }
- manh = dmanh_get(u);
- manl = dmanl_get(u);
- *s0 = '1';
- for (s = s0 + 1; s < s0 + bufsize; s++) {
- *s = xdigs[(manh >> (DBL_MANH_SIZE - 4)) & 0xf];
- manh = (manh << 4) | (manl >> (DBL_MANL_SIZE - 4));
- manl <<= 4;
- }
- /* If ndigits < 0, we are expected to auto-size the precision. */
- if (ndigits < 0) {
- for (ndigits = SIGFIGS; s0[ndigits - 1] == '0'; ndigits--)
- ;
- }
- s = s0 + ndigits;
- *s = '\0';
- if (rve != NULL)
- *rve = s;
- return (s0);
- }
- #ifdef __cplusplus
- #if 0
- {
- #endif
- }
- #endif