src/functional/sscanf_long.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <math.h>
   5 #include <errno.h>
   6 #include <sys/resource.h>
   7 #include "test.h"
   8
   9 int main(void)
  10 {
  11         enum {n = 8*1024*1024};
  12         char *s = malloc(n);
  13         int i;
  14         float f;
  15         char c;
  16
  17         if (!s)
  18                 return t_error("out of memory");
  19         t_setrlim(RLIMIT_STACK, 100*1024);
  20
  21         for (i = 0; i < n; i++) s[i] = '1';
  22         s[n-3] = ' ';
  23         s[n-1] = 0;
  24
  25         /*
  26          * stack overflow if scanf copies s on the stack (glibc)
  27          * same issue with %d except then storing the conversion
  28          * result is undefined behaviour
  29          */
  30         i = sscanf(s, "%f %c", &f, &c);
  31
  32         if (i != 2)
  33                 t_error("sscanf returned %d, want 2\n", i);
  34         if (f != INFINITY)
  35                 t_error("sscanf(longnum, \"%%f\") read %f, want inf\n", f);
  36         if (c != '1')
  37                 t_error("sscanf(\"1\", %%c) read '%c', want '1'\n", c);
  38         free(s);
  39         return t_status;
  40 }