compiler-rt/test/sanitizer_common/TestCases/vsnprintf.cpp

   1 // Test that the common part implementation of *printf interceptors does not
   2 // cause negative-size-param false positives.
   3
   4 // RUN: %clangxx -O2 %s -o %t
   5 // RUN: %env_tool_opts=check_printf=1 %run %t 2>&1
   6
   7 // FIXME: The maximum supported allocation size is too platform-specific:
   8 // REQUIRES: x86_64-target-arch
   9
  10 // FIXME: printf is not intercepted on Windows yet.
  11 // UNSUPPORTED: target={{.*windows-msvc.*}}
  12
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 void write(char *buf, int buf_size, const char *fmt, ...) {
  19   va_list args;
  20   va_start(args, fmt);
  21   vsnprintf(buf, buf_size, fmt, args);
  22   va_end(args);
  23 }
  24
  25 int main() {
  26   char buffer[100];
  27   const size_t kStrSize = 1UL << 31;
  28   char *x = (char *)malloc(kStrSize);
  29   memset(x, '=', kStrSize - 1);
  30   x[kStrSize - 1] = 0;
  31   write(buffer, 100, "%s\n", x);
  32   free(x);
  33   return 0;
  34 }