klibc/klibc/asprintf.c

   1 /*
   2  * asprintf.c
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <stdarg.h>
   8
   9 int asprintf(char **bufp, const char *format, ...)
  10 {
  11   va_list ap, ap1;
  12   int rv;
  13   int bytes;
  14   char *p;
  15
  16   va_start(ap, format);
  17   va_copy(ap1, ap);
  18
  19   bytes = vsnprintf(NULL, 0, format, ap1);
  20   va_end(ap1);
  21
  22   *bufp = p = malloc(bytes+1);
  23   if ( !p )
  24     return -1;
  25
  26   rv = vsnprintf(p, bytes, format, ap);
  27   va_end(ap);
  28
  29   return rv;
  30 }