move main to a new source file, update makefile to support multiple sources

neotools/autoextract.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include "neoadpcmextract.h"
+
+
+int main(int argc, char** argv)
+{
+	if (argc != 2)
+		return 1;
+
+	// Open file.
+	FILE* file = fopen(argv[1], "rb");
+	if (!file)
+		return 1;
+
+	int err = vgmExtractSamples(file);
+	fclose(file);
+	return err;
+}

neotools/neoadpcmextract.Makefile

@@ -1,12 +1,23 @@
 TARGET := neoadpcmextract
-SOURCE := neoadpcmextract.c
+SOURCE := autoextract.c neoadpcmextract.c
 CFLAGS := -std=c99 -O2 -pipe -Wall -Wextra -pedantic
+LDFLAGS := $(CFLAGS)
 
+
+OBJECT := $(SOURCE:%.c=%.o)
+DEPEND := $(OBJECT:%.o=%.d)
+
+.PHONY: default all clean
+default: $(TARGET)
 all: $(TARGET)
 
-$(TARGET): $(SOURCE)
-	$(CC) $(CFLAGS) $< -o $@
+$(TARGET): $(OBJECT)
+	$(CC) $(LDFLAGS) $^ -o $@
+
+%.o: %.c
+	$(CC) $(CFLAGS) -MMD -c $< -o $@
+
+-include: $(DEPEND)
 
-.PHONY: clean
 clean:
-	rm -f $(TARGET)
+	rm -f $(TARGET) $(OBJECT) $(DEPEND)

neotools/neoadpcmextract.c

@@ -61,22 +61,18 @@ int DecodeSample(FILE* fin, const char* name, Buffer* buf)
 	return 0;
 }
 
-int main(int argc, char** argv)
+int vgmExtractSamples(FILE* file)
 {
-	if (argc != 2)
-		return 1;
-
-	// Open file.
-	FILE* file = fopen(argv[1], "rb");
-	if (!file)
-		return 1;
-
-	// Search for pcm headers.
 	Buffer smpBytes = {NULL, 0};
 	char namebuf[32];
 	int smpaCount = 0, smpbCount = 0;
+
+	// Scan for pcm headers.
 	while (!feof(file) && !ferror(file))
 	{
+		// Patterns to match (in hex):
+		// 67 66 82 - ADPCM-A
+		// 67 66 83 - ADPCM-B
 		if (fgetc(file) != 0x67 || fgetc(file) != 0x66)
 			continue;
 
@@ -98,6 +94,5 @@ int main(int argc, char** argv)
 	}
 
 	free(smpBytes.data);
-	fclose(file);
 	return 0;
 }