src/regression/printf-1e9-oob.c

   1 // commit 109048e031f39fbb370211fde44ababf6c04c8fb 2014-04-07
   2 // float printf out-of-bounds access
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include "test.h"
   6
   7 static void t(const char *fmt, double d, const char *want)
   8 {
   9         char buf[256];
  10         int n = strlen(want);
  11         int r = snprintf(buf, sizeof buf, fmt, d);
  12         if (r != n || memcmp(buf, want, n+1) != 0)
  13                 t_error("snprintf(\"%s\",%f) want %s got %s\n", fmt, d, want, buf);
  14 }
  15
  16 int main()
  17 {
  18         // fill stack with something
  19         t("%.1f", 123123123123123.0, "123123123123123.0");
  20         // test for out-of-bounds access
  21         t("%g", 999999999.0, "1e+09");
  22         t("%.3e", 999999999.75, "1.000e+09");
  23         return t_status;
  24 }