/stand.att/printf.c
C | 176 lines | 105 code | 10 blank | 61 comment | 17 complexity | b23f7b605d90a22224ae1c5988292771 MD5 | raw file
- /*-
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. 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.
- * 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.
- *
- * @(#)printf.c 8.1 (Berkeley) 6/11/93
- */
- /*
- * Scaled down version of printf(3).
- *
- * One additional format:
- *
- * The format %b is supported to decode error registers.
- * Its usage is:
- *
- * printf("reg=%b\n", regval, "<base><arg>*");
- *
- * where <base> is the output base expressed as a control character, e.g.
- * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
- * the first of which gives the bit number to be inspected (origin 1), and
- * the next characters (up to a control character, i.e. a character <= 32),
- * give the name of the register. Thus:
- *
- * printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
- *
- * would produce output:
- *
- * reg=3<BITTWO,BITONE>
- */
- #include <sys/cdefs.h>
- #include <sys/types.h>
- /*
- * Note that stdarg.h and the ANSI style va_start macro is used for both
- * ANSI and traditional C compilers.
- */
- #define KERNEL
- #include <machine/stdarg.h>
- #undef KERNEL
- static void kprintn __P((u_long, int));
- void
- #if __STDC__
- printf(const char *fmt, ...)
- #else
- printf(fmt /* , va_alist */)
- char *fmt;
- #endif
- {
- register char *p;
- register int ch, n;
- unsigned long ul;
- int lflag, set;
- va_list ap;
- va_start(ap, fmt);
- for (;;) {
- while ((ch = *fmt++) != '%') {
- if (ch == '\0')
- return;
- putchar(ch);
- }
- lflag = 0;
- reswitch: switch (ch = *fmt++) {
- case 'l':
- lflag = 1;
- goto reswitch;
- case 'b':
- ul = va_arg(ap, int);
- p = va_arg(ap, char *);
- kprintn(ul, *p++);
- if (!ul)
- break;
- for (set = 0; n = *p++;) {
- if (ul & (1 << (n - 1))) {
- putchar(set ? ',' : '<');
- for (; (n = *p) > ' '; ++p)
- putchar(n);
- set = 1;
- } else
- for (; *p > ' '; ++p);
- }
- if (set)
- putchar('>');
- break;
- case 'c':
- ch = va_arg(ap, int);
- putchar(ch & 0x7f);
- break;
- case 's':
- p = va_arg(ap, char *);
- while (ch = *p++)
- putchar(ch);
- break;
- case 'd':
- ul = lflag ?
- va_arg(ap, long) : va_arg(ap, int);
- if ((long)ul < 0) {
- putchar('-');
- ul = -(long)ul;
- }
- kprintn(ul, 10);
- break;
- case 'o':
- ul = lflag ?
- va_arg(ap, u_long) : va_arg(ap, u_int);
- kprintn(ul, 8);
- break;
- case 'u':
- ul = lflag ?
- va_arg(ap, u_long) : va_arg(ap, u_int);
- kprintn(ul, 10);
- break;
- case 'x':
- ul = lflag ?
- va_arg(ap, u_long) : va_arg(ap, u_int);
- kprintn(ul, 16);
- break;
- default:
- putchar('%');
- if (lflag)
- putchar('l');
- putchar(ch);
- }
- }
- va_end(ap);
- }
- static void
- kprintn(ul, base)
- unsigned long ul;
- int base;
- {
- /* hold a long in base 8 */
- char *p, buf[(sizeof(long) * NBBY / 3) + 1];
- p = buf;
- do {
- *p++ = "0123456789abcdef"[ul % base];
- } while (ul /= base);
- do {
- putchar(*--p);
- } while (p > buf);
- }