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  1.     #include <stdio.h>
  2.     #include <assert.h>
  3.     #include <stdlib.h>
  4.  
  5.     void report(char* eaf, char* initials, char* foo)
  6.     {
  7.         printf("eaf = %p, initials = %p, foo = %p\n", eaf, initials, foo);;
  8.         printf("*eaf = %d, *initials = %d, *foo = %d\n", eaf[0], initials[0], foo[0]);
  9.     }
  10.  
  11.     void load(const char* label, const char* into, size_t intoSize)
  12.     {
  13.         assert(intoSize > 1); // can't store a string in 1 character.
  14.         printf("%s\n", label);
  15.  
  16.         char input[1024] = "";
  17.         fgets(input, sizeof(input), stdin);
  18.  
  19.         size_t len = strlen(input);
  20.         // strip trailing \n off.
  21.         if (len > 0 && input[len - 1] == '\n') {
  22.             input[--len] = 0;
  23.         }
  24.  
  25.         // abort on empty input
  26.         if (len <= 0) {
  27.             fprintf(stderr, "Invalid input - terminated.\n");
  28.             exit(1);
  29.         }
  30.  
  31.         if (len >= intoSize) {
  32.             fprintf(stderr, "Invalid input - length was %u, limit is %u\n", len, intoSize - 1);
  33.             exit(2);
  34.         }
  35.  
  36.         strncpy(into, input, intoSize);
  37.     }
  38.  
  39.     int main(int argc, const char* argv[])
  40.     {
  41.         char eaf[10], initials[1], foo[10];
  42.         report(eaf, initials, foo);
  43.  
  44.         load("Insert states of the optimized AFD", eaf, sizeof(eaf));
  45.         report(eaf, initials, foo);
  46.  
  47.         load("Insert initial AFD state", initials, sizeof(initials));
  48.         report(eaf, initials, foo);
  49.  
  50.         printf("eaf = %s\ninitials = %s\n", eaf, initials);
  51.  
  52.         return 0;
  53.     }
Runtime error #stdin #stdout #stderr 0s 1968KB
comments (?)
stdin 
fred
bob
stdout 
eaf = 0xbfd135ac, initials = 0xbfd135ab, foo = 0xbfd135b6
*eaf = -69, *initials = -65, *foo = -47
Insert states of the optimized AFD
eaf = 0xbfd135ac, initials = 0xbfd135ab, foo = 0xbfd135b6
*eaf = 102, *initials = -65, *foo = -47
stderr 
prog: prog.c:13: load: Assertion `intoSize > 1' failed.
https://ideone.com/UQiujj
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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