The Tcpdump Group git mirrors - libpcap/blob - missing/win_asprintf.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4
   5 #include "portability.h"
   6
   7 int
   8 pcapint_vasprintf(char **strp, const char *format, va_list args)
   9 {
  10         int len;
  11         size_t str_size;
  12         char *str;
  13         int ret;
  14
  15         len = _vscprintf(format, args);
  16         if (len == -1) {
  17                 *strp = NULL;
  18                 return (-1);
  19         }
  20         str_size = len + 1;
  21         str = malloc(str_size);
  22         if (str == NULL) {
  23                 *strp = NULL;
  24                 return (-1);
  25         }
  26         ret = vsnprintf(str, str_size, format, args);
  27         if (ret == -1) {
  28                 free(str);
  29                 *strp = NULL;
  30                 return (-1);
  31         }
  32         *strp = str;
  33         /*
  34          * vsnprintf() shouldn't truncate the string, as we have
  35          * allocated a buffer large enough to hold the string, so its
  36          * return value should be the number of characters printed.
  37          */
  38         return (ret);
  39 }
  40
  41 int
  42 pcapint_asprintf(char **strp, const char *format, ...)
  43 {
  44         va_list args;
  45         int ret;
  46
  47         va_start(args, format);
  48         ret = pcapint_vasprintf(strp, format, args);
  49         va_end(args);
  50         return (ret);
  51 }