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      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 }
     74