diff options
Diffstat (limited to 'missing/win_snprintf.c')
| -rw-r--r-- | missing/win_snprintf.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/missing/win_snprintf.c b/missing/win_snprintf.c index 65a8ea1a5cd9..f42240352920 100644 --- a/missing/win_snprintf.c +++ b/missing/win_snprintf.c @@ -1,6 +1,8 @@ #include <stdio.h> #include <stdarg.h> +#include "portability.h" + int pcap_vsnprintf(char *str, size_t str_size, const char *format, va_list args) { @@ -13,6 +15,16 @@ pcap_vsnprintf(char *str, size_t str_size, const char *format, va_list args) * 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); |