sbase/libutil/eprintf.c
FRIGN e40fc2b176 Check argv0 in xvprintf()
You never know, given printf'ing NULL-strings might crash the
program, we shouldn't just pass argv0 blindly to it.
2015-12-21 14:13:36 +00:00

60 lines
832 B
C

/* See LICENSE file for copyright and license details. */
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../util.h"
char *argv0;
static void xvprintf(const char *, va_list);
void
eprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
exit(1);
}
void
enprintf(int status, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
exit(status);
}
void
weprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
}
void
xvprintf(const char *fmt, va_list ap)
{
if (argv0 && strncmp(fmt, "usage", strlen("usage")))
fprintf(stderr, "%s: ", argv0);
vfprintf(stderr, fmt, ap);
if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
fputc(' ', stderr);
perror(NULL);
}
}