string/bug-strncat1.c

   1 /* Test case by Joseph S. Myers <jsm28@cam.ac.uk>.  */
   2 #undef __USE_STRING_INLINES
   3 #define __USE_STRING_INLINES
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <libc-diag.h>
   8
   9 char d[3] = "\0\1\2";
  10
  11 int
  12 main (void)
  13 {
  14   DIAG_PUSH_NEEDS_COMMENT;
  15 #if __GNUC_PREREQ (8, 0)
  16   /* GCC 8 warns about strncat truncating output; this is deliberately
  17      tested here.  */
  18   DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
  19 #endif
  20   strncat (d, "\5\6", 1);
  21   DIAG_POP_NEEDS_COMMENT;
  22   if (d[0] != '\5')
  23     {
  24       puts ("d[0] != '\\5'");
  25       exit (1);
  26     }
  27   if (d[1] != '\0')
  28     {
  29       puts ("d[1] != '\\0'");
  30       exit (1);
  31     }
  32   if (d[2] != '\2')
  33     {
  34       puts ("d[2] != '\\2'");
  35       exit (1);
  36     }
  37
  38   return 0;
  39 }