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/* @(#)jssnprintf.c 1.6 00/05/07 Copyright 1985 J. Schilling */
/*
* Copyright (c) 1985 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h>
#include <sys/types.h> /* Try to get size_t */
#include <stdio.h> /* Try again for size_t */
#include <stdxlib.h> /* Try again for size_t */
#include <vadefs.h>
#include <standard.h>
#include <schily.h>
EXPORT int js_snprintf __PR((char *, size_t maxcnt, const char *, ...));
typedef struct {
char *ptr;
int count;
} *BUF, _BUF;
#ifdef PROTOTYPES
static void _cput(char c, long l)
#else
static void _cput(c, l)
char c;
long l;
#endif
{
register BUF bp = (BUF)l;
if (--bp->count > 0) {
*bp->ptr++ = c;
} else {
/*
* Make sure that there will never be a negative overflow.
*/
bp->count++;
}
}
/* VARARGS2 */
#ifdef PROTOTYPES
int js_snprintf(char *buf, size_t maxcnt, const char *form, ...)
#else
int js_snprintf(buf, maxcnt, form, va_alist)
char *buf;
unsigned maxcnt;
char *form;
va_dcl
#endif
{
va_list args;
int cnt;
_BUF bb;
bb.ptr = buf;
bb.count = maxcnt;
#ifdef PROTOTYPES
va_start(args, form);
#else
va_start(args);
#endif
cnt = format(_cput, (long)&bb, form, args);
va_end(args);
*(bb.ptr) = '\0';
if (bb.count <= 0)
return (-1);
return (cnt);
}
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