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#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;
}
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