openbsd-compat/regress/snprintftest.c

   1 /*
   2  * Copyright (c) 2005 Darren Tucker
   3  * Copyright (c) 2005 Damien Miller
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #define BUFSZ 2048
  19
  20 #include <sys/types.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25
  26 static int failed = 0;
  27
  28 static void
  29 fail(const char *m)
  30 {
  31         fprintf(stderr, "snprintftest: %s\n", m);
  32         failed = 1;
  33 }
  34
  35 int x_snprintf(char *str, size_t count, const char *fmt, ...)
  36 {
  37         size_t ret;
  38         va_list ap;
  39
  40         va_start(ap, fmt);
  41         ret = vsnprintf(str, count, fmt, ap);
  42         va_end(ap);
  43         return ret;
  44 }
  45
  46 int
  47 main(void)
  48 {
  49         char b[5];
  50         char *src;
  51
  52         snprintf(b,5,"123456789");
  53         if (b[4] != '\0')
  54                 fail("snprintf does not correctly terminate long strings");
  55
  56         /* check for read overrun on unterminated string */
  57         if ((src = malloc(BUFSZ)) == NULL) {
  58                 fail("malloc failed");
  59         } else {
  60                 memset(src, 'a', BUFSZ);
  61                 snprintf(b, sizeof(b), "%.*s", 1, src);
  62                 if (strcmp(b, "a") != 0)
  63                         fail("failed with length limit '%%.s'");
  64         }
  65
  66         /* check that snprintf and vsnprintf return sane values */
  67         if (snprintf(b, 1, "%s %d", "hello", 12345) != 11)
  68                 fail("snprintf does not return required length");
  69         if (x_snprintf(b, 1, "%s %d", "hello", 12345) != 11)
  70                 fail("vsnprintf does not return required length");
  71
  72         return failed;
  73 }