EMILE/libunix/vsprintf.c

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2005-11-08 02:04:54 +00:00
/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
*
* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
*
*
* Extracted vsprinf & adapted by BenH for MountX, Wed, June 3 1998.
* Added support for pascal strings.
*/
#include <stdarg.h>
typedef unsigned long u_long;
typedef unsigned int u_int;
typedef unsigned char u_char;
#define NBBY 8
static char *ksprintn(u_long ul, int base, int *lenp, int prec);
/*
* Scaled down version of sprintf(3).
*/
int
vsprintf(char *buf, const char *cfmt, va_list ap)
{
register const char *fmt = cfmt;
register char *p, *bp;
register int ch, base;
u_long ul;
int lflag, tmp, width, pstring;
int prec, precspec;
char padc;
for (bp = buf; ; ) {
padc = ' ';
width = 0;
prec = 0;
precspec = 0;
pstring = 0;
while ((ch = *(u_char *)fmt++) != '%')
if ((*bp++ = (char)ch) == '\0')
return ((bp - buf) - 1);
lflag = 0;
reswitch: switch (ch = *(u_char *)fmt++) {
case '0':
padc = '0';
goto reswitch;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (width = 0;; ++fmt) {
width = width * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
goto reswitch;
case '#':
pstring = 1;
goto reswitch;
case '*':
width = va_arg(ap, int);
goto reswitch;
case '.':
precspec = 1;
if (*fmt == '*') {
prec = va_arg(ap, int);
++fmt;
goto reswitch;
}
for (prec = 0;; ++fmt) {
ch = *fmt;
if (ch < '0' || ch > '9')
break;
prec = prec * 10 + ch - '0';
}
goto reswitch;
case 'l':
lflag = 1;
goto reswitch;
/* case 'b': ... break; XXX */
case 'c':
*bp++ = (char)va_arg(ap, int);
break;
/* case 'r': ... break; XXX */
case 's':
p = va_arg(ap, char *);
if (pstring)
{
prec = precspec ? ((prec < *p) ? prec : *p) : *p;
p++;
precspec = 1;
}
while ((!precspec || (--prec >= 0)) && ((*bp = *p++) != 0))
++bp;
break;
case 'd':
ul = (unsigned long)(lflag ? va_arg(ap, long) : va_arg(ap, int));
if ((long)ul < 0) {
*bp++ = (char)'-';
ul = (unsigned long)(-(long)ul);
}
base = 10;
goto number;
break;
case 'o':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap,
u_int);
base = 8;
goto number;
break;
case 'u':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap,
u_int);
base = 10;
goto number;
break;
case 'p':
*bp++ = '0';
*bp++ = 'x';
ul = (u_long)va_arg(ap, void *);
base = 16;
goto number;
case 'x':
case 'X':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap,
u_int);
base = 16;
number: p = ksprintn(ul, base, &tmp, prec);
if (width && (width -= tmp) > 0)
while (width--)
*bp++ = padc;
while ((ch = *p--) != 0)
*bp++ = (char)ch;
break;
default:
*bp++ = '%';
if (lflag)
*bp++ = 'l';
/* FALLTHROUGH */
case '%':
*bp++ = (char)ch;
}
}
}
/*
* Put a number (base <= 16) in a buffer in reverse order; return an
* optional length and a pointer to the NULL terminated (preceded?)
* buffer.
*/
static char *
ksprintn(u_long ul, int base, int *lenp, int prec)
{ /* A long in base 8, plus NULL. */
static char buf[sizeof(long) * NBBY / 3 + 4];
register char *p;
int i;
p = buf;
for(i=0;i<sizeof(buf);i++)
buf[i] = 0;
do {
*++p = "0123456789abcdef"[ul % base];
ul /= base;
} while ((--prec > 0 || ul != 0) && p < buf + sizeof(buf) - 1);
if (lenp)
*lenp = p - buf;
return (p);
}