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#if 0
exec cc -Weverything -Wno-vla -o ~/.bin/xx $0
#endif
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char **argv)
{
size_t cols = 16;
size_t group = 8;
char *path = NULL;
while (getopt(argc, argv, "c:g:") > 0)
if (optopt == 'c') {
cols = (size_t) strtol(optarg, NULL, 10);
if (!cols) return EXIT_FAILURE;
} else if (optopt == 'g') {
group = (size_t) strtol(optarg, NULL, 10);
} else return EXIT_FAILURE;
if (argc > optind)
path = argv[optind];
FILE *file = path ? fopen(path, "r") : stdin;
if (!file) {
perror(path);
return EXIT_FAILURE;
}
uint8_t buf[cols];
for (;;) {
size_t n = fread(buf, 1, sizeof(buf), file);
for (size_t i = 0; i < n; ++i) {
if (group && i && !(i % group)) printf(" ");
printf("%02x ", buf[i]);
}
printf("\n");
if (n < sizeof(buf)) break;
}
if (ferror(file)) {
perror(path);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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