string/bug-strncat1.c

   1 #undef __USE_STRING_INLINES
   2 #define __USE_STRING_INLINES
   3 #include <sys/cdefs.h>
   4 #include <libc-diag.h>
   5 #if __GNUC_PREREQ (8, 0)
   6 /* GCC warns about strncat truncating output; this is deliberately
   7    tested here.  If fortify is enabled, it is also triggered by the
   8    wrappers. */
   9 DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
  10 #endif
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14
  15 char d[3] = "\0\1\2";
  16
  17 int
  18 main (void)
  19 {
  20   DIAG_PUSH_NEEDS_COMMENT;
  21   strncat (d, "\5\6", 1);
  22   DIAG_POP_NEEDS_COMMENT;
  23   if (d[0] != '\5')
  24     {
  25       puts ("d[0] != '\\5'");
  26       exit (1);
  27     }
  28   if (d[1] != '\0')
  29     {
  30       puts ("d[1] != '\\0'");
  31       exit (1);
  32     }
  33   if (d[2] != '\2')
  34     {
  35       puts ("d[2] != '\\2'");
  36       exit (1);
  37     }
  38
  39   return 0;
  40 }