Misc: Fix a slew of less-than-important warnings

src/core/cheats.c

@@ -282,14 +282,14 @@ bool mCheatParseFile(struct mCheatDevice* device, struct VFile* vf) {
 			StringListDeinit(&directives);
 			return false;
 		}
-		while (isspace((int) cheat[i])) {
+		while (isspace((unsigned) cheat[i])) {
 			++i;
 		}
 		switch (cheat[i]) {
 		case '#':
 			do {
 				++i;
-			} while (isspace((int) cheat[i]));
+			} while (isspace((unsigned) cheat[i]));
 			newSet = device->createSet(device, &cheat[i]);
 			newSet->enabled = !nextDisabled;
 			nextDisabled = false;
@@ -305,7 +305,7 @@ bool mCheatParseFile(struct mCheatDevice* device, struct VFile* vf) {
 		case '!':
 			do {
 				++i;
-			} while (isspace((int) cheat[i]));
+			} while (isspace((unsigned) cheat[i]));
 			if (strcasecmp(&cheat[i], "disabled") == 0) {
 				nextDisabled = true;
 				break;
@@ -384,7 +384,7 @@ bool mCheatParseLibretroFile(struct mCheatDevice* device, struct VFile* vf) {
 					return false;
 				}
 				++eq;
-				while (isspace((int) eq[0])) {
+				while (isspace((unsigned) eq[0])) {
 					if (eq[0] == '\0') {
 						return false;
 					}
@@ -393,7 +393,7 @@ bool mCheatParseLibretroFile(struct mCheatDevice* device, struct VFile* vf) {
 
 				char* end;
 				unsigned long nCheats = strtoul(eq, &end, 10);
-				if (end[0] != '\0' && !isspace(end[0])) {
+				if (end[0] != '\0' && !isspace((unsigned) end[0])) {
 					return false;
 				}
 
@@ -423,7 +423,7 @@ bool mCheatParseLibretroFile(struct mCheatDevice* device, struct VFile* vf) {
 			return false;
 		}
 		++eq;
-		while (isspace((int) eq[0])) {
+		while (isspace((unsigned) eq[0])) {
 			if (eq[0] == '\0') {
 				return false;
 			}

src/feature/commandline.c

@@ -217,6 +217,9 @@ void mArgumentsApply(const struct mArguments* args, struct mSubParser* subparser
 }
 
 bool mArgumentsApplyDebugger(const struct mArguments* args, struct mCore* core, struct mDebugger* debugger) {
+	UNUSED(args);
+	UNUSED(core);
+	UNUSED(debugger);
 	bool hasDebugger = false;
 
 #ifdef USE_EDITLINE

src/gb/audio.c

@@ -602,7 +602,7 @@ void GBAudioRun(struct GBAudio* audio, int32_t timestamp, int channels) {
 			int32_t last = 0;
 			int samples = 0;
 			int positiveSamples = 0;
-			int lsb;
+			int lsb = 0;
 			int coeff;
 			if (audio->ch4.power) {
 				// TODO: Can this be batched too?

src/gba/cart/ereader.c

@@ -371,7 +371,7 @@ void GBACartEReaderScan(struct GBACartEReader* ereader, const void* data, size_t
 	memset(ereader->dots, 0, EREADER_DOTCODE_SIZE);
 
 	uint8_t blockRS[44][0x10];
-	uint8_t block0[0x30];
+	uint8_t block0[0x30] = {0};
 	bool parsed = false;
 	bool bitmap = false;
 	bool reducedHeader = false;

src/gba/sharkport.c

@@ -202,7 +202,7 @@ bool GBASavedataExportSharkPort(const struct GBA* gba, struct VFile* vf) {
 		char c[0x1C];
 		int32_t i;
 	} buffer;
-	uint32_t size = strlen(SHARKPORT_HEADER);
+	int32_t size = strlen(SHARKPORT_HEADER);
 	STORE_32(size, 0, &buffer.i);
 	if (vf->write(vf, &buffer.i, 4) < 4) {
 		return false;
@@ -271,7 +271,7 @@ bool GBASavedataExportSharkPort(const struct GBA* gba, struct VFile* vf) {
 	}
 
 	uint32_t checksum = 0;
-	size_t i;
+	ssize_t i;
 	for (i = 0; i < 0x1C; ++i) {
 		checksum += buffer.c[i] << (checksum % 24);
 	}

src/util/image.c

@@ -904,9 +904,9 @@ uint32_t mColorConvert(uint32_t color, enum mColorFormat from, enum mColorFormat
 		return color;
 	}
 
-	int r;
-	int g;
-	int b;
+	int r = 0;
+	int g = 0;
+	int b = 0;
 	int a = 0xFF;
 
 	switch (from) {

src/util/image/png-io.c

@@ -62,7 +62,7 @@ static png_infop _pngWriteHeader(png_structp png, unsigned width, unsigned heigh
 }
 
 png_infop PNGWriteHeader(png_structp png, unsigned width, unsigned height, enum mColorFormat fmt) {
-	int type;
+	int type = -1;
 	switch (fmt) {
 	case mCOLOR_XBGR8:
 	case mCOLOR_XRGB8:
@@ -94,6 +94,9 @@ png_infop PNGWriteHeader(png_structp png, unsigned width, unsigned height, enum
 		type = PNG_COLOR_TYPE_PALETTE;
 		break;
 	}
+	if (type < 0) {
+		return NULL;
+	}
 	return _pngWriteHeader(png, width, height, NULL, 0, type);
 }
 
@@ -373,6 +376,7 @@ bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned s
 	} else {
 		depth = 3;
 	}
+	stride *= mColorFormatBytes(fmt);
 	png_bytep row = malloc(sizeof(png_byte) * width * depth);
 	if (!row) {
 		return false;
@@ -383,7 +387,6 @@ bool PNGWritePixels(png_structp png, unsigned width, unsigned height, unsigned s
 		return false;
 	}
 	const png_byte* pixelRow = pixelData;
-	stride *= mColorFormatBytes(fmt);
 	unsigned i;
 	for (i = 0; i < height; ++i, pixelRow += stride) {
 		switch (fmt) {