eglib/src/vasprintf.c

   1 #include <stdarg.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4
   5 int vasprintf(char **ret, const char *fmt, va_list ap)
   6 {
   7         char *buf;
   8         int len;
   9         size_t buflen;
  10         va_list ap2;
  11
  12 #ifdef _MSC_VER
  13         ap2 = ap;
  14         len = _vscprintf(fmt, ap2); // NOTE MS specific extension ( :-( )
  15 #else
  16         va_copy(ap2, ap);
  17         len = vsnprintf(NULL, 0, fmt, ap2);
  18 #endif
  19
  20         if (len > 0 && (buf = malloc((buflen = (size_t) (len + 1)))) != NULL) {
  21                 len = vsnprintf(buf, buflen, fmt, ap);
  22                 *ret = buf;
  23         } else {
  24                 *ret = NULL;
  25                 len = -1;
  26         }
  27
  28         va_end(ap2);
  29         return len;
  30 }