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merge32bit.c
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merge32bit.c
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/*
* merge32bit.c: Merge four 8-bit files into a single 32-bit file.
*
* The command-line option `-o` specifies the output file, and the options
* `-0`, `-1`, `-2`, and `-3` specify the input files. The output file is
* created by alternately writing one byte from each input file. This can
* be used to merge a 32-bit ROM image that has been split into four 8-bit
* images into a a single 32-bit file.
*
* Copyright (c) 2019 Kimmo Kulovesi, https://arkku.com
* Provided with absolutely no warranty, use at your own risk only.
* Distribute freely, mark modified copies as such.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
int
main (int argc, char *argv[]) {
int i;
FILE *outfile = stdout;
FILE *infile[4] = { NULL };
char *arg = NULL;
while (--argc) {
arg = *(++argv);
if (arg[0] == '-' && arg[1] && arg[2] == '\0') {
switch (arg[1]) {
case 'o':
if (--argc == 0) {
goto invalid_argument;
}
++argv;
if (!(outfile = fopen(*argv, "wb"))) {
goto argument_error;
}
break;
case '3':
case '2':
case '1':
case '0': {
int byte_number = arg[1] - '0';
if (--argc == 0) {
goto invalid_argument;
}
++argv;
if (!(infile[byte_number] = fopen(*argv, "rb"))) {
goto argument_error;
}
break;
}
case '?':
arg = NULL;
goto usage;
default:
goto invalid_argument;
}
continue;
}
invalid_argument:
(void) fprintf(stderr, "Invalid argument: %s\n", arg);
usage:
(void) fprintf(stderr, "merge32bit - Copyright (c) 2019 Kimmo Kulovesi\n");
(void) fprintf(stderr, "Usage: merge32bit [-o <out.bin>] <-{0,1,2,3} inN.bin>\n");
return arg ? EXIT_FAILURE : EXIT_SUCCESS;
argument_error:
perror(*argv);
return EXIT_FAILURE;
}
if (!(infile[0] && infile[1] && infile[2] && infile[3])) {
arg = "";
goto usage;
}
errno = 0;
for (;;) {
for (i = 0; i < 4; ++i) {
int byte = fgetc(infile[i]);
if (byte == EOF) {
goto end_read;
}
if (fputc(byte, outfile) == EOF) {
goto end_read;
}
}
}
end_read:
if (errno) {
perror("Error");
}
for (i = 0; i < 4; ++i) {
(void) fclose(infile[i]);
}
if (outfile != stdin) {
(void) fclose(outfile);
}
return errno ? EXIT_FAILURE : EXIT_SUCCESS;
}