utils/src/StrPrintf.cpp

   1 #include <utils.h>
   2
   3 std::string StrPrintfV(const char *format, va_list args)
   4 {
   5         std::string out(15, '#'); // 15 is maximum number of characters when SSO still being used
   6
   7         va_list args_copy;
   8         va_copy(args_copy, args);
   9         int rv = vsnprintf(&out[0], out.size(), format, args_copy);
  10         va_end(args_copy);
  11
  12         if (rv >= 0 && rv < (int)out.size()) {
  13                 out.resize(rv);
  14                 return out;
  15         }
  16
  17         out.resize(rv + 1);
  18         rv = vsnprintf(&out[0], out.size(), format, args);
  19
  20         if (rv >= 0 && rv < (int)out.size()) {
  21                 out.resize(rv);
  22                 return out;
  23         }
  24
  25         out = "Bad format string: ";
  26         out+= format;
  27         return out;
  28 }
  29
  30 std::string StrPrintf(const char *format, ...)
  31 {
  32         va_list args;
  33         va_start(args, format);
  34
  35         const std::string &out = StrPrintfV(format, args);
  36
  37         va_end(args);
  38
  39         return out;
  40 }
  41