Add tests and fix minor problems in specifier parser

CMakeLists.txt

@@ -5,4 +5,5 @@ aux_source_directory("src" SOURCES)
 add_library(${PROJECT_NAME} STATIC ${SOURCES})
 target_include_directories(${PROJECT_NAME} PUBLIC include)
 
-
+# Add tests. This is not included in the overall build
+add_subdirectory(test)

include/simple-printf/simple-printf.h

@@ -2,6 +2,7 @@
 #define _SIMPLE_PRINTF_H_
 
 #include <stddef.h>
+#include <stdbool.h>
 
 #ifndef SIMPLE_PRINTF_ATTR_FORMAT
 #if ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
@@ -13,6 +14,33 @@
 #define SIMPLE_PRINTF_ATTR_FORMAT(fmt, args)
 #endif
 
+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;
+};
+
+/**
+ * @brief Helper function to parse printf format specifiers
+ * 
+ * @param start Start of parsing
+ * @param[out] result Result of format specifier parsing
+ */
+void parse_format_specifier(const char *start, struct format_specifier *result);
+
 /**
  * @brief Simple implementation of snprintf
  * 

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;

test/CMakeLists.txt

@@ -0,0 +1,11 @@
+project(simple-printf-test)
+
+add_subdirectory(catch2 EXCLUDE_FROM_ALL)
+
+add_custom_target(test "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}" "-r compact" "-s" DEPENDS ${PROJECT_NAME})
+
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/catch-framework")
+aux_source_directory("src" TEST_SOURCES)
+
+add_executable(${PROJECT_NAME} EXCLUDE_FROM_ALL ${TEST_SOURCES})
+target_link_libraries(${PROJECT_NAME} PRIVATE simple-printf Catch2::Catch2WithMain)

test/src/tests.cpp

@@ -0,0 +1,114 @@
+#include <array>
+#include <catch2/catch_test_macros.hpp>
+#include <cstdio>
+#include <string>
+#include <iostream>
+
+extern "C" {
+#include <simple-printf/simple-printf.h>
+}
+
+TEST_CASE("Parse Invalid Specifier")
+{
+	const char *tst = "%m";
+	const char *tst2 = "%45m";
+	const char *tst3 = "%014m";
+	struct format_specifier result;
+
+        parse_format_specifier(tst, &result);
+        REQUIRE(result.specifier == FMT_INVALID);
+
+	parse_format_specifier(tst, &result);
+        REQUIRE(result.specifier == FMT_INVALID);
+
+	parse_format_specifier(tst, &result);
+        REQUIRE(result.specifier == FMT_INVALID);
+}
+
+TEST_CASE("Parse Format Specifier c", "Char")
+{
+	const char *tst = "%c";
+	struct format_specifier result;
+
+	parse_format_specifier(tst, &result);
+
+	REQUIRE(result.length_of_provided_specifier == 2);
+	REQUIRE(result.specifier == FMT_CHAR);
+	REQUIRE(result.zero_pad == false);
+}
+
+TEST_CASE("Parse Format Specifier s", "String")
+{
+	const char *tst = "%s";
+	struct format_specifier result;
+
+	parse_format_specifier(tst, &result);
+
+	REQUIRE(result.length_of_provided_specifier == 2);
+	REQUIRE(result.specifier == FMT_STRING);
+        REQUIRE(result.length == 0);
+	REQUIRE(result.zero_pad == false);
+}
+
+TEST_CASE("Parse Format Specifier 04s", "String")
+{
+	const char *tst = "%04s";
+	struct format_specifier result;
+
+	parse_format_specifier(tst, &result);
+
+	REQUIRE(result.specifier == FMT_STRING);
+        REQUIRE(result.length_of_provided_specifier == 4);
+        REQUIRE(result.length == 4);
+	REQUIRE(result.zero_pad == true);
+}
+
+TEST_CASE("Parse Format Specifier 08x", "hex")
+{
+	const char *tst = "%08x";
+	struct format_specifier result;
+
+	parse_format_specifier(tst, &result);
+
+	REQUIRE(result.specifier == FMT_HEXUINT);
+        REQUIRE(result.length_of_provided_specifier == 4);
+        REQUIRE(result.length == 8);
+	REQUIRE(result.zero_pad == true);
+}
+
+TEST_CASE("Parse Format Specifier 08x with stuff", "hex")
+{
+	const std::array<std::string, 8> tst_arr  {
+                std::move(std::string("%08xff458578")),
+                std::move(std::string("%08x45578")),
+                std::move(std::string("%08xx458578")),
+                std::move(std::string("%08x44458578")),
+                std::move(std::string("%08x45sdf458578")),
+                std::move(std::string("%08xsfsdf4558578")),
+                std::move(std::string("%08xX")),
+                std::move(std::string("%08xdsda"))
+        };	
+        
+        struct format_specifier result;
+
+        for (const auto &tst : tst_arr) {
+                parse_format_specifier(tst.c_str(), &result);
+                REQUIRE(result.specifier == FMT_HEXUINT);
+                REQUIRE(result.length_of_provided_specifier == 4);
+                REQUIRE(result.length == 8);
+                REQUIRE(result.zero_pad == true);
+        }
+}
+
+TEST_CASE("Parse Percent spefifier")
+{
+	const char *tst = "%%";
+	struct format_specifier result;
+
+	parse_format_specifier(tst, &result);
+
+	REQUIRE(result.specifier == FMT_PERCENT);
+        REQUIRE(result.length_of_provided_specifier == 2);
+        REQUIRE(result.length == 0);
+	REQUIRE(result.zero_pad == false);
+}