Function str_strcasestr

ut.h:1221–1258

* search @strb in @stra ignoring case of both, return pointer to 1st occurrence */

 * search @strb in @stra ignoring case of both, return pointer to 1st occurrence
 */
static inline char* str_strcasestr(const str *stra, const str *strb)
{
	int i;
	int len;

	if (stra==NULL || strb==NULL || stra->s==NULL || strb->s==NULL
			|| stra->len<=0 || strb->len<=0) {
#ifdef EXTRA_DEBUG
		LM_DBG("bad parameters\n");
#endif
		return NULL;
	}

	if (strb->len > stra->len)
		return NULL;

	len=0;
	while (stra->len-len >= strb->len){
		if (tolower(stra->s[len]) != tolower(strb->s[0])) {
			len++;
			continue;
		}

		for (i=1; i<strb->len; i++)
			if (tolower(stra->s[len+i])!=tolower(strb->s[i])) {
				len++;
				break;
			}

		if (i != strb->len)
			continue;

		return stra->s+len;
	}


	return NULL;
}

/*
 * case-insensitive compare n chars of two str's