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-rw-r--r--xex1to2.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/xex1to2.c b/xex1to2.c
new file mode 100644
index 0000000..36a33a2
--- /dev/null
+++ b/xex1to2.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#define SELF "xex1to2"
+
+FILE *open_file(const char *name, const char *mode) {
+ FILE *f = fopen(name, mode);
+ if(f) return f;
+
+ fprintf(stderr, SELF ": %s: %s\n", name, strerror(errno));
+ exit(1);
+}
+
+void invalid(void) {
+ fprintf(stderr, SELF ": input is not a valid Atari DOS 1.0 executable.\n");
+ exit(1);
+}
+
+void read_header(FILE *in) {
+ int c;
+
+ c = getc(in);
+ if(c < 0 || c != 0x84) invalid();
+ c = getc(in);
+ if(c < 0 || c != 0x09) invalid();
+}
+
+int main(int argc, char **argv) {
+ int c;
+ FILE *in = stdin, *out = stdout;
+
+ if(argc > 3) {
+ fprintf(stderr, "Usage: " SELF " [dos1_input.xex] [dos2_output.xex]\n");
+ exit(1);
+ }
+
+ if(argc > 1) in = open_file(argv[1], "rb");
+ if(argc > 2) out = open_file(argv[2], "wb");
+
+ if(isatty(fileno(out))) {
+ fprintf(stderr,
+ SELF ": Standard output is a terminal; not writing binary data\n");
+ exit(1);
+ }
+
+ read_header(in);
+ fputc(0xff, out);
+ fputc(0xff, out);
+
+ while( (c = fgetc(in)) >= 0 )
+ fputc(c, out);
+
+ fclose(in);
+ fclose(out);
+
+ return 0;
+}