stdio-common/scanf4.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <libc-diag.h>
   4
   5 int
   6 main(int arc, char *argv[])
   7 {
   8   int res;
   9   unsigned int val;
  10
  11   FILE *fp = fopen ("/dev/null", "r");
  12
  13   val = 0;
  14   res = fscanf(fp, "%n", &val);
  15
  16   printf("Result of fscanf %%n = %d\n", res);
  17   printf("Scanned format = %d\n", val);
  18
  19   /* We're testing exactly the case the warning is for.  */
  20   DIAG_PUSH_NEEDS_COMMENT;
  21   DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat-zero-length");
  22
  23   res = fscanf(fp, "");
  24
  25   DIAG_POP_NEEDS_COMMENT;
  26
  27   printf("Result of fscanf \"\" = %d\n", res);
  28   if (res != 0)
  29     abort ();
  30
  31   res = fscanf(fp, "BLURB");
  32   printf("Result of fscanf \"BLURB\" = %d\n", res);
  33   if (res >= 0)
  34     abort ();
  35
  36   fclose (fp);
  37
  38   return 0;
  39   return 0;
  40 }