/*
# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>

#include "ioutils.h"
#include "errors.h"

const char* OPTIONS = "hv:c:";

void printHelp(char* progname) {
	fprintf(stderr, "\nUsage: %s <desired-length> <input file> [<input file> ...]\n"
			"    The file will be padded in-place.\n"
			"\n"
			"    By default, the file is padded with zeros, but:\n"
			"      [-v <numerical value of character to pad with>]\n"
			"      [-c <character to pad with>]\n"
			"\n", progname);
}


int main(int argc, char** args) {
    int argchar;
	char* progname = args[0];
	char* infn;
	size_t padtolen;
	char padchar = '\0';
	int nargs = 0;
	int i;

    while ((argchar = getopt (argc, args, OPTIONS)) != -1) {
		switch (argchar) {
		case 'v':
			padchar = atoi(optarg);
			printf("Padding with value %i, character \"%c\"\n", (int)padchar, padchar);
			break;
		case 'c':
			padchar = optarg[0];
			printf("Padding with character \"%c\"\n", padchar);
			break;
		case 'h':
		default:
			printHelp(progname);
			exit(-1);
		}
	}
	if (optind < argc) {
		nargs = argc - optind;
		args += optind;
	}
	if (nargs < 2) {
		printHelp(progname);
		exit(-1);
	}
	padtolen = atol(args[0]);

	for (i=1; i<nargs; i++) {
		infn = args[i];
		printf("Padding file \"%s\" to length %lli.\n", infn, (long long int)padtolen);
		if (pad_file(infn, padtolen, padchar)) {
			ERROR("Failed to pad file");
			exit(-1);
		}
	}
	return 0;
}