faux/lub/string/string_nocasestr.c

/*
 * string_nocasestr.c
 *
 * Find a string within another string in a case insensitive manner
 */
#include "private.h"

#include "lub/ctype.h"

/*--------------------------------------------------------- */
const char *lub_string_nocasestr(const char *cs, const char *ct)
{
	const char *p = NULL;
	const char *result = NULL;

	while (*cs) {
		const char *q = cs;

		p = ct;
		/*lint -e155 Ignoring { }'ed sequence within an expression, 0 assumed 
		 * MACRO implementation uses braces to prevent multiple increments
		 * when called.
		 */
		/*lint -e506 Constant value Boolean
		 * not the case because of tolower() evaluating to 0 under lint
		 * (see above)
		 */
		while (*p && *q
		       && (lub_ctype_tolower(*p) == lub_ctype_tolower(*q))) {
			p++, q++;
		}
		if (0 == *p) {
			break;
		}
		cs++;
	}
	if (p && !*p) {
		/* we've found the first match of ct within cs */
		result = cs;
	}
	return result;
}

/*--------------------------------------------------------- */
unsigned int lub_string_equal_part(const char *str1, const char *str2)
{
	unsigned int cnt = 0;

	if (!str1 || !str2)
		return cnt;
	while (*str1 && *str2) {
		if (*str1 != *str2)
			break;
		cnt++;
		str1++;
		str2++;
	}

	return cnt;
}

/*--------------------------------------------------------- */