Add tests and fix minor problems in specifier parser

src/simple-printf.c

@@ -2,25 +2,6 @@
 #include <stddef.h>
 #include <stdbool.h>
 
-enum format_specifier_type {
-	FMT_INVALID = 0,
-	FMT_INTEGER,
-	FMT_UNSIGNED,
-	FMT_STRING,
-	FMT_HEXUINT_CAPITALIZED,
-	FMT_HEXUINT,
-	FMT_CHAR,
-	FMT_SIZE,
-	FMT_PERCENT,
-};
-
-struct format_specifier {
-	enum format_specifier_type specifier;
-	size_t length; /**< @brief lenght of formatted output.*/
-	bool zero_pad; 
-	size_t length_of_provided_specifier;
-};
-
 enum format_parser_state {
 	PARSER_PERCENT = 0,
 	PARSER_SECOND,
@@ -87,7 +68,7 @@ static enum format_specifier_type resolve_specifier(char c)
 	return ret;
 }
 
-static void parse_format_specifier(const char *start, struct format_specifier *result)
+void parse_format_specifier(const char *start, struct format_specifier *result)
 {
 	size_t fmt_len = 1ull;
 	bool keep_parsing = true;
@@ -115,15 +96,19 @@ static void parse_format_specifier(const char *start, struct format_specifier *r
 		switch (state) {
 		case PARSER_PERCENT:
 			if (*ptr == '%') {
-				advance_ptr++;
+				advance_ptr = true;
 				next_state = PARSER_SECOND;
+			} else {
+				keep_parsing = false;
 			}
 			break;
 		case PARSER_SECOND:
 			if (*ptr == '0') {
 				result->zero_pad = true;
-				advance_ptr++;
+				advance_ptr = true;
 				next_state = PARSER_NUM;
+				current_token = ptr + 1;
+				token_length = 0;
 			} else if (*ptr > '9' || *ptr < '0') {
 				/* Specifier */
 				next_state = PARSER_SPECIFIER;