AS_HEX_AT        2690 ext/psych/yaml/scanner.c         octet = (AS_HEX_AT(parser->buffer, 1) << 4) + AS_HEX_AT(parser->buffer, 2);
AS_HEX_AT        3233 ext/psych/yaml/scanner.c                         value = (value << 4) + AS_HEX_AT(parser->buffer, k);
AS_HEX_AT         249 ext/psych/yaml/yaml_private.h #define AS_HEX(string)  AS_HEX_AT((string),0)