Function parse_method

parser/parse_methods.c:57–337

* Parse a method pointed by start, end is the last character to check (if NULL * assume that start is a zero terminated string) * => assign enum bit to method. * Returns pointer to next char if parse succeeded * and NULL otherwise. */

 * and NULL otherwise.
 */
char* parse_method(char* start, char* end, unsigned int* method)
{
	int len=0;
	int max=0;

	 if (!start || !method) {
		 LM_ERR("invalid parameter value\n");
		 return NULL;
	 }

	 if(end)
		 max = end - start;
	 *method = METHOD_UNDEF;

	 switch (start[0]) {
		 case 'A':
		 case 'a':
			if(end && max<3)
				goto unknown;

			if ((start[1]=='c' || start[1]=='C')
					&& (start[2]=='k' || start[2]=='K'))
			{
				*method = METHOD_ACK;
				len = 3;
				goto done;
			}
			goto unknown;

		case 'B':
		case 'b':
			if(end && max<3)
				goto unknown;

			if ((start[1]=='y' || start[1]=='Y')
					&& (start[2]=='e' || start[2]=='E'))
			{
				*method = METHOD_BYE;
				len = 3;
				goto done;
			}
			goto unknown;

	 	case 'C':
		case 'c':
			if(end && max<6)
				goto unknown;
			if ((start[1]=='a' || start[1]=='A')
					&& (start[2]=='n' || start[2]=='N')
					&& (start[3]=='c' || start[3]=='C')
					&& (start[4]=='e' || start[4]=='E')
					&& (start[5]=='l' || start[5]=='L'))
			{
				*method = METHOD_CANCEL;
				len = 6;
				goto done;
			}
			goto unknown;