Using sscanf to get hostname from URL

func_cut_host.c

#include <stdio.h>
#include <string.h>


//-------------------------
// URL INFO
//-------------------------
struct xx_url_t {
	char	str[1024];	/* URL strings */
};

/*------------------------------------------------------------------------------*/
/*
 * @brief   get hostname from URL (URL文字列からhost名を取得)
 * @param	[i/o]	buf		work-buffer
 * @param	[in]	in		URL-strings
 * @retval	*p			host-strings
 * @retval	*"\0"			error
 */
/*------------------------------------------------------------------------------*/
char * func_cut_host( struct xx_url_t *buf, const char * in )
{
	static	char	*blank = "\0";
	int	err;
	char	*p;

	// check argument
	if ( buf != NULL && in != NULL ){

		// check buffer overflow
		if ( sizeof(buf->str) > strlen(in) ) {

			// get 2nd part.
			//     ex:"http://www.a.b.c/cgi/jobs.cgi?h=99&z=3" -> www.a.b.c
			//     ex:"file:///tmp/test.txt" -> tmp
			err = sscanf( in, "%*[^/]%*[/]%[^/]", buf->str);
			if ( 1 == err ) {
				p = buf->str;
			} else {
				// sscanf error
				p = blank;
			}
		}else {
			// buffer overflow
			p = blank;
		}
	}else {
		// invalid argument 
		p = blank;
	}
	return p;
}


// test
main() {
	struct xx_url_t	buf;
	char		*url;

	url = "http://www.a.b.c/cgi/jobs.cgi?h=99&z=3";

	printf( "URL[%s] -> host[%s]\n", url, func_cut_host( &buf, url ));
}

Good! Thanks!