bin2fex: open input and output files

bin2fex.c

@@ -16,7 +16,76 @@
  */
 #include "sunxi-tools.h"
 
-int main(int UNUSED(argc), char *UNUSED(argv[]))
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+
+#define errf(...)	fprintf(stderr, __VA_ARGS__)
+
+/**
+ */
+static int decompile(const char *bin, size_t bin_size, int out, const char *out_name)
 {
+	errf("bin size: %zu\n", bin_size);
 	return 0;
 }
+
+/**
+ */
+int main(int argc, char *argv[])
+{
+	struct stat sb;
+	int ret = -1;
+	int fd[] = {0, 1};
+	const char *filename[] = { "stdin", "stdout" };
+	void *p;
+
+	/* open */
+	if (argc>1) {
+		filename[0] = argv[1];
+
+		if ((fd[0] = open(filename[0], O_RDONLY)) < 0) {
+			errf("%s: %s\n", filename[0], strerror(errno));
+			goto usage;
+		}
+		if (argc > 2) {
+			filename[1] = argv[2];
+
+			if ((fd[1] = open(filename[1], O_WRONLY|O_CREAT, 0666)) < 0) {
+				errf("%s: %s\n", filename[1], strerror(errno));
+				goto usage;
+			}
+		}
+	}
+
+	/* mmap input */
+	if (fstat(fd[0], &sb) == -1)
+		errf("fstat: %s: %s\n", filename[0], strerror(errno));
+	else if (!S_ISREG(sb.st_mode))
+		errf("%s: %s\n", filename[0], strerror(errno));
+	else if ((p = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd[0], 0)) == MAP_FAILED)
+		errf("mmap: %s: %s\n", filename[0], strerror(errno));
+	else {
+		/* decompile mmap */
+		close(fd[0]);
+
+		ret = decompile(p, sb.st_size, fd[1], filename[1]);
+		if (munmap(p, sb.st_size) == -1)
+			errf("munmap: %s: %s\n", filename[0], strerror(errno));
+
+		goto done;
+	}
+
+usage:
+	errf("Usage: %s [<script.bin> [<script.fex>]]\n", argv[0]);
+
+	if (fd[0] > 2) close(fd[0]);
+done:
+	if (fd[1] > 2) close(fd[1]);
+	return ret;
+}