158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/* $NetBSD: subr_prf.c,v 1.10 2003/08/07 16:32:30 agc Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)printf.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Scaled down version of printf(3).
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <machine/stdarg.h>
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#include "stand.h"
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static void kprintn(void (*)(int), u_long, int);
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static void sputchar(int);
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static void kdoprnt(void (*)(int), const char *, va_list);
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static char *sbuf, *ebuf;
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static void
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sputchar(int c)
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{
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if (sbuf < ebuf)
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*sbuf++ = c;
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}
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void
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vprintf(const char *fmt, va_list ap)
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{
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kdoprnt(putchar, fmt, ap);
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}
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int
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vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
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{
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sbuf = buf;
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ebuf = buf + size - 1;
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kdoprnt(sputchar, fmt, ap);
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*sbuf = '\0';
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return (sbuf - buf);
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}
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static void
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kdoprnt(void (*put)(int), const char *fmt, va_list ap)
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{
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char *p;
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int ch;
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unsigned long ul;
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int lflag;
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for (;;) {
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while ((ch = *fmt++) != '%') {
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if (ch == '\0')
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return;
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put(ch);
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}
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lflag = 0;
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reswitch: switch (ch = *fmt++) {
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case 'l':
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lflag = 1;
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goto reswitch;
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case 'c':
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ch = va_arg(ap, int);
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put(ch & 0x7f);
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break;
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case 's':
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p = va_arg(ap, char *);
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while ((ch = *p++))
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put(ch);
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break;
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case 'd':
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ul = lflag ?
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va_arg(ap, long) : va_arg(ap, int);
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if ((long)ul < 0) {
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put('-');
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ul = -(long)ul;
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}
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kprintn(put, ul, 10);
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break;
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case 'o':
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ul = lflag ?
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va_arg(ap, u_long) : va_arg(ap, u_int);
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kprintn(put, ul, 8);
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break;
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case 'u':
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ul = lflag ?
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va_arg(ap, u_long) : va_arg(ap, u_int);
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kprintn(put, ul, 10);
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break;
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case 'p':
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put('0');
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put('x');
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lflag = 1;
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/* fall through */
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case 'x':
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ul = lflag ?
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va_arg(ap, u_long) : va_arg(ap, u_int);
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kprintn(put, ul, 16);
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break;
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default:
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put('%');
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if (lflag)
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put('l');
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if (ch == '\0')
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return;
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put(ch);
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}
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}
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}
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static void
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kprintn(void (*put)(int), unsigned long ul, int base)
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{
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/* hold a long in base 8 */
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char *p, buf[(sizeof(long) * NBBY / 3) + 1];
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p = buf;
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do {
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*p++ = "0123456789abcdef"[ul % base];
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} while (ul /= base);
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do {
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put(*--p);
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} while (p > buf);
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}
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