#include <stdio.h> #include <stdarg.h> #include "portability.h" int pcap_vsnprintf(char *str, size_t str_size, const char *format, va_list args) { int ret; ret = _vsnprintf_s(str, str_size, _TRUNCATE, format, args); /* * XXX - _vsnprintf() and _snprintf() do *not* guarantee * that str is null-terminated, but C99's vsnprintf() * and snprintf() do, and we want to offer C99 behavior, * so forcibly null-terminate the string. * * We don't, however, offer C99 behavior for the return * value; _vsnprintf_s() returns -1, not the number of * characters that would have been put into the buffer * had it been large enough, if the string is truncated. * The only way to get that value is to use _vscprintf(); * getting that count isn't worth the re-formatting. * * XXX - does _vsnprintf_s() return -1 on a formatting * error? */ str[str_size - 1] = '\0'; return (ret); } int pcap_snprintf(char *str, size_t str_size, const char *format, ...) { va_list args; int ret; va_start(args, format); ret = pcap_vsnprintf(str, str_size, format, args); va_end(args); return (ret); } |