182288/test.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 int main(void)
   6 {
   7         FILE *f;
   8         char buf[1]; /* Change 256 to 1, and you can see the wierd behaviour
   9                         * of fgets if run against glibc-2.3.5 */
  10         unsigned lines = 0;
  11
  12         system("touch null_file");
  13
  14         /* Create this file before starting! */
  15         f = fopen("null_file", "r");
  16         if (!f) {
  17                 perror("fopen");
  18                 return EXIT_FAILURE;
  19         }
  20
  21         while (1) {
  22 puts("reading");
  23                 if (!fgets(buf, sizeof buf, f)) {
  24 puts("error");
  25                         if (feof(f))
  26                                 puts("End of File");
  27                         else if (ferror(f))
  28                                 puts("Error");
  29                         else
  30                                 puts("Wierd behaviour");
  31                         break;
  32                 }
  33
  34                 if (strchr(buf, '\n')) {
  35                         printf("Read %u lines.\n", ++lines);
  36                 }
  37         }
  38
  39         fclose(f);
  40         return 0;
  41 }