1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <stdarg.h> 4 5 #include "portability.h" 6 7 int 8 pcap_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 = pcap_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 * pcap_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 pcap_asprintf(char **strp, const char *format, ...) 43 { 44 va_list args; 45 int ret; 46 47 va_start(args, format); 48 ret = pcap_vasprintf(strp, format, args); 49 va_end(args); 50 return (ret); 51 } 52