#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>

#define WIDTH 10


void usage(const char *progname) {
	fprintf(stderr, "usage: %s <file> [-r <file>] [-w <width>]\n", progname);
}


int main(int argc, char *argv[]) {
	FILE *fp;
	uint8_t buf[1];
	int i = 0;
	int opt;
	char *redir = NULL;
	unsigned int width = WIDTH;
	bool r = false;


	if (argc < 2) {
		usage(argv[0]);
		return EXIT_FAILURE;
	}

	while ((opt = getopt(argc, argv, "w:r:")) != -1) {
		switch (opt) {
		case 'w':
			width = atoi(optarg);
			break;
		case 'r':
			redir = optarg;
			break;
		default:
			usage(argv[0]);
			return EXIT_FAILURE;
		}
	}

	argc -= optind;
	argv += optind;

	fp = fopen(argv[0], "rb");
	if (fp == NULL) {
		fprintf(stderr, "Unable to open %s: %s\n", argv[1], strerror(errno));
		return EXIT_FAILURE;
	}

 	printf("echo -ne \"");

	while(fread(buf, 1, 1, fp)) {
		i++;
		printf("\\x%02x", buf[0]);
		if (i % width == 0) {
			if (redir) {
				printf("\" %s %s\n", r ? ">>" : ">", redir);
				r = true;
			} else {
				printf("\"\n");
			}
			printf("echo -ne \"");
		}
	}

	if (i % WIDTH != 0)
		printf("\"\n");

	fclose(fp);

	return EXIT_SUCCESS;
}