source/utility.cxx

   1 #include <source/utility.hxx>
   2 #include <cassert>
   3
   4 bool libsex::vformat(
   5         char* const buf,
   6         size_t len,
   7         const char* const file,
   8         unsigned short line,
   9         const char* const msg,
  10         va_list ap) throw()
  11 {
  12         size_t chars = snprintf(buf, len, "%s:%d: ", file, line);
  13
  14         // If buffer was too small, chars contains length
  15         // of chars that would've been written. Chars must
  16         // be lower than length or else we could not fit
  17         // the message into buffer, too.
  18         bool didFitIntoBuffer = chars < len;
  19
  20         if (didFitIntoBuffer) {
  21                 size_t      newLength = len - chars;
  22                 char* const newBuffer = buf + chars;
  23                 chars = vsnprintf(newBuffer, newLength, msg, ap);
  24                 didFitIntoBuffer = chars <= newLength;
  25         }
  26
  27         return didFitIntoBuffer;
  28 }
  29
  30 bool libsex::format(
  31         char* const buf,
  32         size_t len,
  33         const char* const file,
  34         unsigned short line,
  35         const char* const msg,
  36         ...) throw()
  37 {
  38         va_list ap;
  39         va_start(ap, msg);
  40
  41         bool result = vformat(buf, len, file, line, msg, ap);
  42
  43         va_end(ap);
  44         return result;
  45 }