test/special.c

   1 char gc;
   2 int  gi;
   3 char *gs;
   4
   5 int f()
   6 {
   7   signed char c;
   8   unsigned char uc;
   9   int i;
  10   long int li = 23;
  11   short int silly = 3;
  12   char *s;
  13
  14   printf("hullo this is a %s !", "test");
  15   (void) scanf("hullo, welcome to %d", &i); /* defines i */
  16
  17   printf("even %d %c harder", i, c); /* 1. Variable c used before definition */
  18   uc = 'a';
  19   printf("even %d %c harder", li, uc); /* 2. printf format arg 1 (%d) expects int gets long int: li */
  20   printf("even %ld %d %hd %hd %d harder", i, li, i, silly, silly);  /* 3, 4. [5, 6.]
  21                                                                      * arg1 (expects long),
  22                                                                      arg2 (expects int),
  23                                                                      arg3 (expects short),
  24                                                                      * (okay if +relaxquals) arg5 (expects int) */
  25
  26   (void) scanf("%*d okay"); /* [NO! 5. Statement has no effect] */
  27   printf("%s %s", s, s); /* 5. Variable s used before definition */
  28
  29   printf("a real %+14.3i", c, i); /* 6, 7. printf format arg 1 (%i) expects int gets char: c, extra arg */
  30   fprintf(stdout, "a real %+14.33i", c, i); /* 8, 9. fprintf format arg 1 (%i) expects int gets char: c, extra */
  31   printf("%% %d %f %f", c, i); /* 10, 11, 12. printf format arg 1, arg2, missing arg 3 */
  32
  33   (void) scanf("hullo, welcome to %d", &i);
  34   (void) scanf("hullo, welcome to %d", i); /* 13. scanf format arg 1 (%d) expects int * gets int: i */
  35
  36   /* 3 type errors */
  37   (void) fscanf(stdin, "hullo, welcome to %d %c %s", i, c, &s); /* 14, 15, 16. arg1, arg2, arg3 */
  38
  39   (void) scanf("hullo, welcome to %hhd", &c);
  40   fprintf(stdin, "hullo, welcome to %hhu\n", c); /* 17. */
  41
  42   (void) fscanf(stdout, "hullo, welcome to %hho", &c); /* 18. */
  43   printf("hullo, welcome to %hhi\n", c);
  44
  45   /* 3 modification errors */
  46   (void) fscanf(stdin, "hullo, welcome to %23d %c %s", &gi, &gc, gs); /* 19, 20, 21. modifies g1, gc, gs */
  47   /* 1 modification error */
  48   (void) fscanf(stdin, "hullo, welcome to %*23d %*c %s", gs); /* 22. modifies gs */
  49
  50   return 3;
  51 }
  52