Function acl_vstring_rstrcasestr

lib_acl/src/stdlib/acl_vstring.c:737–769

/* acl_vstring_rstrcasestr - locate byte in buffer */

char *acl_vstring_rstrcasestr(ACL_VSTRING *vp, const char *needle)
{
	const unsigned char *cm = maptolower;
	unsigned char *cp;
	const unsigned char *np = 0, *needle_end;

	if (vp == NULL || needle == NULL || *needle == 0) {
		return NULL;
	}

	needle_end = (const unsigned char *) needle + strlen(needle) - 1;

	for (cp = (unsigned char *) acl_vstring_end(vp) - 1;
		cp >= (unsigned char *) acl_vstring_str(vp); cp--) {
		if (np) {
			if (*cp == cm[*np]) {
				if (--np < (const unsigned char *) needle) {
					return ((char *) cp);
				}
			} else {
				np = 0;
			}
		}
		if (!np && *cp == cm[*needle_end]) {
			np = needle_end - 1;
			if (np < (const unsigned char *) needle) {
				return (char *) cp;
			}
		}
	}

	return NULL;
}

/* acl_vstring_insert - insert text into string */