strspn.c

来自「操作系统SunOS 4.1.3版本的源码」· C语言 代码 · 共 25 行

#if !defined(lint) && defined(SCCSIDS)
static	char sccsid[] = "@(#)strspn.c 1.1 92/07/30 SMI"; /* from S5R2 1.2 */
#endif

/*LINTLIBRARY*/
/*
 * Return the number of characters in the maximum leading segment
 * of string which consists solely of characters from charset.
 */
int
strspn(string, charset)
char	*string;
register char	*charset;
{
	register char *p, *q;

	for(q=string; *q != '\0'; ++q) {
		for(p=charset; *p != '\0' && *p != *q; ++p)
			;
		if(*p == '\0')
			break;
	}
	return(q-string);
}