Sscanf2 [portable] [2026 Update]

int ret = sscanf2(input, "%as %d", &str, &num); if (ret < 0) fprintf(stderr, "sscanf2 error: %s\n", sscanf2_strerror(ret)); // e.g., "Format string error at position 3"

int sscanf2_s(const char *str, size_t str_max, const char *format, ...); sscanf2

But a full sscanf2 would require a state machine to parse the format string and handle variable arguments with stdarg.h . int ret = sscanf2(input, "%as %d", &str, &num);

sscanf2 is an enhanced version of the standard sscanf function designed to eliminate common pitfalls: int ret = sscanf2(input

Always put your sscanf call inside an if statement. If it returns anything other than 0 , it means the input didn't match your format.

For this guide, we define: