Parse the request method

Challenge

The first token of an HTTP request line is the method (GET, POST, ...). Extract it.

Task

Implement int request_method(const char *req, char *out, int outsz) that copies the method — everything up to the first space — into out (bounded by outsz) and returns its length.

Input

• req: the request line (e.g. "GET /x HTTP/1.1").
• out, outsz: destination buffer for the method and its size.

Output

Returns the method length on success, or -1 if req contains no space.

Example

request_method("GET /x HTTP/1.1", out, 16)   ->   3, out="GET"
request_method("GET", out, 16)               ->   -1   (no space)

Edge cases

• No space anywhere: return -1.
• Copy bounded by outsz and NUL-terminate.

Input format

The request line (req) and an output buffer (out) with size (outsz).

Output format

The method length on success, or -1 if there is no space.

Constraints

Method is the first token up to the first space. Copy bounded by outsz and NUL-terminate; return -1 if no space.

Starter code

#include <string.h>

int request_method(const char *req, char *out, int outsz) {
    /* TODO */
    return -1;
}