/*
** smatch.c -- match a switch (option)
**
** This code is Copyright (c) 2002, by the authors of nmh.  See the
** COPYRIGHT file in the root directory of the nmh distribution for
** complete copyright information.
*/

#include <h/mh.h>


int
smatch(char *string, struct swit *swp)
{
	char *sp, *tcp;
	int firstone, len;
	struct swit *tp;

	firstone = UNKWNSW;

	if (!string)
		return firstone;
	len = strlen(string);

	for (tp = swp; tp->sw; tp++) {
		tcp = tp->sw;
		if (len < abs(tp->minchars))
			continue;  /* no match */
		for (sp = string; *sp == *tcp++;) {
			if (*sp++ == '\0')
				return (tp - swp);  /* exact match */
		}
		if (*sp) {
			if (*sp != ' ')
				continue;  /* no match */
			if (*--tcp == '\0')
				return (tp - swp);  /* exact match */
		}
		if (firstone == UNKWNSW)
			firstone = tp - swp;
		else
			firstone = AMBIGSW;
	}

	return (firstone);
}
