Add tests and fix minor problems in specifier parser

.clang-format

@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-format configuration file. Intended for clang-format >= 11.
+#
+# For more information, see:
+#
+#   Documentation/process/clang-format.rst
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterNamespace: true
+  AfterObjCDeclaration: false
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeComma
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: false
+ColumnLimit: 120
+CommentPragmas: '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 8
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: true
+
+# Taken from git's rules
+PenaltyBreakAssignment: 10
+PenaltyBreakBeforeFirstCallParameter: 30
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 0
+PenaltyBreakString: 10
+PenaltyExcessCharacter: 100
+PenaltyReturnTypeOnItsOwnLine: 60
+
+PointerAlignment: Right
+ReflowComments: false
+SortIncludes: false
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatementsExceptForEachMacros
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInContainerLiterals: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: Cpp03
+TabWidth: 8
+UseTab: Always
+...

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "test/catch2"]
+	path = test/catch2
+	url = https://git.shimatta.de/3rd-party/catch2.git

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/catch2

@@ -0,0 +1 @@
+Subproject commit 0631b607ee2bbc07c7c238f0b15b23ef21926960

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);
+}