jssnprintf.c
上传用户:xiejiait
上传日期:2007-01-06
资源大小:881k
文件大小:2k
- /* @(#)jssnprintf.c 1.5 00/01/21 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>
- 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) = ' ';
- if (bb.count <= 0)
- return (-1);
- return (cnt);
- }