/commands/sed/process.c
C | 683 lines | 509 code | 44 blank | 130 comment | 155 complexity | 45900a94f296da0017eda308ec375da0 MD5 | raw file
Possible License(s): AGPL-1.0, BSD-3-Clause
- /* $NetBSD: process.c,v 1.37 2006/06/18 05:16:41 gdamore Exp $ */
- /*-
- * Copyright (c) 1992, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Diomidis Spinellis of Imperial College, University of London.
- *
- * 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.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- */
- /*-
- * Copyright (c) 1992 Diomidis Spinellis.
- *
- * This code is derived from software contributed to Berkeley by
- * Diomidis Spinellis of Imperial College, University of London.
- *
- * 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
- */
- #if HAVE_NBTOOL_CONFIG_H
- #include "nbtool_config.h"
- #endif
- #include <sys/cdefs.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/ioctl.h>
- #include <sys/uio.h>
- #include <ctype.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <limits.h>
- #include <regex.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <termios.h>
- #include "defs.h"
- #include "extern.h"
- static SPACE HS, PS, SS;
- #define pd PS.deleted
- #define ps PS.space
- #define psl PS.len
- #define hs HS.space
- #define hsl HS.len
- static __inline int applies(struct s_command *);
- static void flush_appends(void);
- static void lputs(char *);
- static __inline int regexec_e(regex_t *, const char *, int, int, size_t);
- static void regsub(SPACE *, char *, char *);
- static int substitute(struct s_command *);
- struct s_appends *appends; /* Array of pointers to strings to append. */
- static int appendx; /* Index into appends array. */
- int appendnum; /* Size of appends array. */
- static int lastaddr; /* Set by applies if last address of a range. */
- static int sdone; /* If any substitutes since last line input. */
- /* Iov structure for 'w' commands. */
- static regex_t *defpreg;
- size_t maxnsub;
- regmatch_t *match;
- #define OUT(s) { fwrite(s, sizeof(u_char), psl, stdout); }
- void
- process(void)
- {
- struct s_command *cp;
- SPACE tspace;
- size_t len, oldpsl;
- char *p;
- oldpsl = 0;
- for (linenum = 0; mf_fgets(&PS, REPLACE);) {
- pd = 0;
- top:
- cp = prog;
- redirect:
- while (cp != NULL) {
- if (!applies(cp)) {
- cp = cp->next;
- continue;
- }
- switch (cp->code) {
- case '{':
- cp = cp->u.c;
- goto redirect;
- case 'a':
- if (appendx >= appendnum) {
- appends = xrealloc(appends,
- sizeof(struct s_appends) *
- (appendnum * 2));
- appendnum *= 2;
- }
- appends[appendx].type = AP_STRING;
- appends[appendx].s = cp->t;
- appends[appendx].len = strlen(cp->t);
- appendx++;
- break;
- case 'b':
- cp = cp->u.c;
- goto redirect;
- case 'c':
- pd = 1;
- psl = 0;
- if (cp->a2 == NULL || lastaddr)
- (void)printf("%s", cp->t);
- break;
- case 'd':
- pd = 1;
- goto new;
- case 'D':
- if (psl == 0)
- pd = 1;
- if (pd)
- goto new;
- if ((p = memchr(ps, '\n', psl - 1)) == NULL) {
- pd = 1;
- goto new;
- } else {
- psl -= (p + 1) - ps;
- memmove(ps, p + 1, psl);
- goto top;
- }
- case 'g':
- cspace(&PS, hs, hsl, REPLACE);
- break;
- case 'G':
- if (hs == NULL)
- cspace(&HS, "\n", 1, REPLACE);
- cspace(&PS, hs, hsl, 0);
- break;
- case 'h':
- cspace(&HS, ps, psl, REPLACE);
- break;
- case 'H':
- cspace(&HS, ps, psl, 0);
- break;
- case 'i':
- (void)printf("%s", cp->t);
- break;
- case 'l':
- lputs(ps);
- break;
- case 'n':
- if (!nflag && !pd)
- OUT(ps)
- flush_appends();
- if (!mf_fgets(&PS, REPLACE))
- exit(0);
- pd = 0;
- break;
- case 'N':
- flush_appends();
- if (!mf_fgets(&PS, 0)) {
- if (!nflag && !pd)
- OUT(ps)
- exit(0);
- }
- break;
- case 'p':
- if (pd)
- break;
- OUT(ps)
- break;
- case 'P':
- if (pd)
- break;
- if ((p = memchr(ps, '\n', psl - 1)) != NULL) {
- oldpsl = psl;
- psl = (p + 1) - ps;
- }
- OUT(ps)
- if (p != NULL)
- psl = oldpsl;
- break;
- case 'q':
- if (!nflag && !pd)
- OUT(ps)
- flush_appends();
- exit(0);
- case 'r':
- if (appendx >= appendnum) {
- appends = xrealloc(appends,
- sizeof(struct s_appends) *
- (appendnum * 2));
- appendnum *= 2;
- }
- appends[appendx].type = AP_FILE;
- appends[appendx].s = cp->t;
- appends[appendx].len = strlen(cp->t);
- appendx++;
- break;
- case 's':
- sdone |= substitute(cp);
- break;
- case 't':
- if (sdone) {
- sdone = 0;
- cp = cp->u.c;
- goto redirect;
- }
- break;
- case 'w':
- if (pd)
- break;
- if (cp->u.fd == -1 && (cp->u.fd = open(cp->t,
- O_WRONLY|O_APPEND|O_CREAT|O_TRUNC,
- DEFFILEMODE)) == -1)
- err(FATAL, "%s: %s",
- cp->t, strerror(errno));
- if (write(cp->u.fd, ps, psl) != psl)
- err(FATAL, "%s: %s",
- cp->t, strerror(errno));
- break;
- case 'x':
- if (hs == NULL)
- cspace(&HS, "\n", 1, REPLACE);
- tspace = PS;
- PS = HS;
- HS = tspace;
- break;
- case 'y':
- if (pd)
- break;
- for (p = ps, len = psl; --len; ++p)
- *p = cp->u.y[(int)*p];
- break;
- case ':':
- case '}':
- break;
- case '=':
- (void)printf("%lu\n", linenum);
- }
- cp = cp->next;
- } /* for all cp */
- new: if (!nflag && !pd)
- OUT(ps)
- flush_appends();
- } /* for all lines */
- }
- /*
- * TRUE if the address passed matches the current program state
- * (lastline, linenumber, ps).
- */
- #define MATCH(a) \
- (a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \
- (a)->type == AT_LINE ? linenum == (a)->u.l : lastline
- /*
- * Return TRUE if the command applies to the current line. Sets the inrange
- * flag to process ranges. Interprets the non-select (``!'') flag.
- */
- static __inline int
- applies(struct s_command *cp)
- {
- int r;
- lastaddr = 0;
- if (cp->a1 == NULL && cp->a2 == NULL)
- r = 1;
- else if (cp->a2) {
- if (cp->inrange) {
- if (MATCH(cp->a2)) {
- cp->inrange = 0;
- lastaddr = 1;
- }
- r = 1;
- } else if (cp->a1 && MATCH(cp->a1)) {
- /*
- * If the second address is a number less than or
- * equal to the line number first selected, only
- * one line shall be selected.
- * -- POSIX 1003.2
- */
- if (cp->a2->type == AT_LINE &&
- linenum >= cp->a2->u.l)
- lastaddr = 1;
- else
- cp->inrange = 1;
- r = 1;
- } else
- r = 0;
- } else
- r = MATCH(cp->a1);
- return (cp->nonsel ? ! r : r);
- }
- /*
- * substitute --
- * Do substitutions in the pattern space. Currently, we build a
- * copy of the new pattern space in the substitute space structure
- * and then swap them.
- */
- static int
- substitute(struct s_command *cp)
- {
- SPACE tspace;
- regex_t *re;
- size_t re_off, slen;
- int lastempty, n;
- char *s;
- s = ps;
- re = cp->u.s->re;
- if (re == NULL) {
- if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) {
- linenum = cp->u.s->linenum;
- err(COMPILE, "\\%d not defined in the RE",
- cp->u.s->maxbref);
- }
- }
- if (!regexec_e(re, s, 0, 0, psl))
- return (0);
- SS.len = 0; /* Clean substitute space. */
- slen = psl;
- n = cp->u.s->n;
- lastempty = 1;
- switch (n) {
- case 0: /* Global */
- do {
- if (lastempty || match[0].rm_so != match[0].rm_eo) {
- /* Locate start of replaced string. */
- re_off = match[0].rm_so;
- /* Copy leading retained string. */
- cspace(&SS, s, re_off, APPEND);
- /* Add in regular expression. */
- regsub(&SS, s, cp->u.s->new);
- }
- /* Move past this match. */
- if (match[0].rm_so != match[0].rm_eo) {
- s += match[0].rm_eo;
- slen -= match[0].rm_eo;
- lastempty = 0;
- } else {
- if (match[0].rm_so == 0)
- cspace(&SS,
- s, match[0].rm_so + 1, APPEND);
- else
- cspace(&SS,
- s + match[0].rm_so, 1, APPEND);
- s += match[0].rm_so + 1;
- slen -= match[0].rm_so + 1;
- lastempty = 1;
- }
- } while (slen > 0 && regexec_e(re, s, REG_NOTBOL, 0, slen));
- /* Copy trailing retained string. */
- if (slen > 0)
- cspace(&SS, s, slen, APPEND);
- break;
- default: /* Nth occurrence */
- while (--n) {
- s += match[0].rm_eo;
- slen -= match[0].rm_eo;
- if (!regexec_e(re, s, REG_NOTBOL, 0, slen))
- return (0);
- }
- /* FALLTHROUGH */
- case 1: /* 1st occurrence */
- /* Locate start of replaced string. */
- re_off = match[0].rm_so + (s - ps);
- /* Copy leading retained string. */
- cspace(&SS, ps, re_off, APPEND);
- /* Add in regular expression. */
- regsub(&SS, s, cp->u.s->new);
- /* Copy trailing retained string. */
- s += match[0].rm_eo;
- slen -= match[0].rm_eo;
- cspace(&SS, s, slen, APPEND);
- break;
- }
- /*
- * Swap the substitute space and the pattern space, and make sure
- * that any leftover pointers into stdio memory get lost.
- */
- tspace = PS;
- PS = SS;
- SS = tspace;
- SS.space = SS.back;
- /* Handle the 'p' flag. */
- if (cp->u.s->p)
- OUT(ps)
- /* Handle the 'w' flag. */
- if (cp->u.s->wfile && !pd) {
- if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile,
- O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1)
- err(FATAL, "%s: %s", cp->u.s->wfile, strerror(errno));
- if (write(cp->u.s->wfd, ps, psl) != psl)
- err(FATAL, "%s: %s", cp->u.s->wfile, strerror(errno));
- }
- return (1);
- }
- /*
- * Flush append requests. Always called before reading a line,
- * therefore it also resets the substitution done (sdone) flag.
- */
- static void
- flush_appends(void)
- {
- FILE *f;
- int count, i;
- char buf[8 * 1024];
- for (i = 0; i < appendx; i++)
- switch (appends[i].type) {
- case AP_STRING:
- fwrite(appends[i].s, sizeof(char), appends[i].len,
- stdout);
- break;
- case AP_FILE:
- /*
- * Read files probably shouldn't be cached. Since
- * it's not an error to read a non-existent file,
- * it's possible that another program is interacting
- * with the sed script through the file system. It
- * would be truly bizarre, but possible. It's probably
- * not that big a performance win, anyhow.
- */
- if ((f = fopen(appends[i].s, "r")) == NULL)
- break;
- while ((count =
- fread(buf, sizeof(char), sizeof(buf), f)) > 0)
- (void)fwrite(buf, sizeof(char), count, stdout);
- (void)fclose(f);
- break;
- }
- if (ferror(stdout))
- err(FATAL, "stdout: %s", strerror(errno ? errno : EIO));
- appendx = sdone = 0;
- }
- static void
- lputs(char *s)
- {
- int count;
- char *escapes, *p;
- #ifndef HAVE_NBTOOL_CONFIG_H
- struct winsize win;
- #endif
- static int termwidth = -1;
- if (termwidth == -1) {
- if ((p = getenv("COLUMNS")) != NULL)
- termwidth = atoi(p);
- #ifndef HAVE_NBTOOL_CONFIG_H
- else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
- win.ws_col > 0)
- termwidth = win.ws_col;
- #endif
- else
- termwidth = 60;
- }
- for (count = 0; *s; ++s) {
- if (count >= termwidth) {
- (void)printf("\\\n");
- count = 0;
- }
- if (isascii((unsigned char)*s) && isprint((unsigned char)*s) &&
- *s != '\\') {
- (void)putchar(*s);
- count++;
- } else {
- escapes = "\\\a\b\f\n\r\t\v";
- (void)putchar('\\');
- if ((p = strchr(escapes, *s)) != NULL) {
- (void)putchar("\\abfnrtv"[p - escapes]);
- count += 2;
- } else {
- (void)printf("%03o", *(u_char *)s);
- count += 4;
- }
- }
- }
- (void)putchar('$');
- (void)putchar('\n');
- if (ferror(stdout))
- err(FATAL, "stdout: %s", strerror(errno ? errno : EIO));
- }
- static __inline int
- regexec_e(regex_t *preg, const char *string, int eflags, int nomatch, size_t slen)
- {
- int eval;
- #ifndef REG_STARTEND
- char *buf;
- #endif
-
- if (preg == NULL) {
- if (defpreg == NULL)
- err(FATAL, "first RE may not be empty");
- } else
- defpreg = preg;
- /* Set anchors, discounting trailing newline (if any). */
- if (slen > 0 && string[slen - 1] == '\n')
- slen--;
- #ifndef REG_STARTEND
- if ((buf = malloc(slen + 1)) == NULL)
- err(1, NULL);
- (void)memcpy(buf, string, slen);
- buf[slen] = '\0';
- eval = regexec(defpreg, buf,
- nomatch ? 0 : maxnsub + 1, match, eflags);
- free(buf);
- #else
- match[0].rm_so = 0;
- match[0].rm_eo = slen;
- eval = regexec(defpreg, string,
- nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND);
- #endif
- switch(eval) {
- case 0:
- return (1);
- case REG_NOMATCH:
- return (0);
- }
- err(FATAL, "RE error: %s", strregerror(eval, defpreg));
- /* NOTREACHED */
- return (0);
- }
- /*
- * regsub - perform substitutions after a regexp match
- * Based on a routine by Henry Spencer
- */
- static void
- regsub(SPACE *sp, char *string, char *src)
- {
- int len, no;
- char c, *dst;
- #define NEEDSP(reqlen) \
- if (sp->len + (reqlen) + 1 >= sp->blen) { \
- size_t newlen = sp->blen + (reqlen) + 1024; \
- sp->space = sp->back = xrealloc(sp->back, newlen); \
- sp->blen = newlen; \
- dst = sp->space + sp->len; \
- }
- dst = sp->space + sp->len;
- while ((c = *src++) != '\0') {
- if (c == '&')
- no = 0;
- else if (c == '\\' && isdigit((unsigned char)*src))
- no = *src++ - '0';
- else
- no = -1;
- if (no < 0) { /* Ordinary character. */
- if (c == '\\' && (*src == '\\' || *src == '&'))
- c = *src++;
- NEEDSP(1);
- *dst++ = c;
- ++sp->len;
- } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) {
- len = match[no].rm_eo - match[no].rm_so;
- NEEDSP(len);
- memmove(dst, string + match[no].rm_so, len);
- dst += len;
- sp->len += len;
- }
- }
- NEEDSP(1);
- *dst = '\0';
- }
- /*
- * aspace --
- * Append the source space to the destination space, allocating new
- * space as necessary.
- */
- void
- cspace(SPACE *sp, char *p, size_t len, enum e_spflag spflag)
- {
- size_t tlen;
- /* Make sure SPACE has enough memory and ramp up quickly. */
- tlen = sp->len + len + 1;
- if (tlen > sp->blen) {
- size_t newlen = tlen + 1024;
- sp->space = sp->back = xrealloc(sp->back, newlen);
- sp->blen = newlen;
- }
- if (spflag == REPLACE)
- sp->len = 0;
- memmove(sp->space + sp->len, p, len);
- sp->space[sp->len += len] = '\0';
- }
- /*
- * Close all cached opened files and report any errors
- */
- void
- cfclose(struct s_command *cp, struct s_command *end)
- {
- for (; cp != end; cp = cp->next)
- switch(cp->code) {
- case 's':
- if (cp->u.s->wfd != -1 && close(cp->u.s->wfd))
- err(FATAL,
- "%s: %s", cp->u.s->wfile, strerror(errno));
- cp->u.s->wfd = -1;
- break;
- case 'w':
- if (cp->u.fd != -1 && close(cp->u.fd))
- err(FATAL, "%s: %s", cp->t, strerror(errno));
- cp->u.fd = -1;
- break;
- case '{':
- cfclose(cp->u.c, cp->next);
- break;
- }
- }