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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void
usage(const char *program)
{
printf("Usage: %s -o outputfile FILE...\n", program);
}
int
main(int argc, char *argv[])
{
int i, ch;
const char *output = NULL;
FILE *infile = NULL;
FILE *outfile = NULL;
if (argc < 4) {
usage(argv[0]);
return EXIT_FAILURE;
}
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-o") == 0) {
i++;
if (i < argc)
output = argv[i];
else {
usage(argv[0]);
return EXIT_FAILURE;
}
}
}
if (output) {
outfile = fopen(output, "wb");
if (!outfile) {
fprintf(stderr, "[ERROR] unable to open output file: %s\n", output);
return EXIT_FAILURE;
}
setbuf(outfile, NULL);
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-o") == 0) {
i++;
continue;
}
infile = fopen(argv[i], "rb");
if (!infile) {
fprintf(stderr, "[ERROR] unable to open input file: %s\n", argv[i]);
return EXIT_FAILURE;
}
setbuf(infile, NULL);
while ((ch = getc(infile)) != EOF) {
if (putc(ch, outfile) == EOF) {
fprintf(stderr, "[ERROR] error writing output file: %s\n", output);
return EXIT_FAILURE;
}
}
fclose(infile);
}
}
fclose(outfile);
return EXIT_SUCCESS;
}
/* vim: set ts=2 sts=2 sw=2 et: */
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