-/*
- * $Id$
- *
- * Replacements for snprintf() and vsnprintf()
- *
- * modified from Sten Gunterberg's BUGTRAQ post of 22 Jul 1997
- * --nathan bryant <nathan@designtrust.com>
- *
- * Use it only if you have the "spare" cycles needed to effectively
- * do every snprintf operation twice! Why is that? Because everything
- * is first vfprintf()'d to /dev/null to determine the number of bytes.
- * Perhaps a bit slow for demanding applications on slow machines,
- * no problem for a fast machine with some spare cycles.
- *
- * You don't have a /dev/null? Every Linux contains one for free!
- *
- * Because the format string is never even looked at, all current and
- * possible future printf-conversions should be handled just fine.
- *
- * Written July 1997 by Sten Gunterberg (gunterberg@ergon.ch)
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-
-static int
-needed (const char *fmt, va_list argp)
-{
- static FILE *sink = NULL;
-
- /* ok, there's a small race here that could result in the sink being
- * opened more than once if we're threaded, but I'd rather ignore it than
- * spend cycles synchronizing :-) */
-
- if (sink == NULL)
- {
- if ((sink = fopen("/dev/null", "w")) == NULL)
- {
- perror("/dev/null");
- exit(1);
- }
- }
-
- return vfprintf(sink, fmt, argp);
-}
-
-int
-vsnprintf (char *buf, size_t max, const char *fmt, va_list argp)
-{
- char *p;
- int size;
-
- if ((p = malloc(needed(fmt, argp) + 1)) == NULL)
- {
- fprintf(stderr, "vsnprintf: malloc failed, aborting\n");
- abort();
- }
-
- if ((size = vsprintf(p, fmt, argp)) >= max)
- size = -1;
-
- strncpy(buf, p, max);
- buf[max - 1] = 0;
- free(p);
- return size;
-}
-
-int
-snprintf (char *buf, size_t max, const char *fmt, ...)
-{
- va_list argp;
- int bytes;
-
- va_start(argp, fmt);
- bytes = vsnprintf(buf, max, fmt, argp);
- va_end(argp);
-
- return bytes;
-}