coreutils

// realpath.c, version 1.0.1

// OMKOV coreutils realpath

// Copyright (C) 2020, Jakob Wakeling

// MIT Licence

#include "util/error.h"

#include "util/optget.h"

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#define VERSION "1.0.1"

static struct lop lops[] = {

	{ "help",    ARG_NUL, 256 },

	{ "version", ARG_NUL, 257 },

	{ NULL, 0, 0 }

};

static inline int rpath(const char *path);

static void hlp(void);

static void ver(void);

int main(int ac, char *av[]) { A0 = av[0];

	struct opt opt = OPTGET_INIT; opt.str = ""; opt.lops = lops;

	for (int o; (o = optget(&opt, av, 1)) != -1;) switch (o) {

	case 256: { hlp(); return 0; }

	case 257: { ver(); return 0; }

	default: { return 1; }

	}

	bool warned = false;

	if (opt.ind == ac) { rpath("."); }

	else for (char **p = &av[opt.ind]; *p; ++p) if (rpath(*p)) {

		warn("%s: %s\n", *p, serr()); warned = true;

	}

	return warned;

}

static inline int rpath(const char *file) {

	char *path;

	if (!(path = realpath(file, NULL))) { return 1; }

	fputs(path, stdout); fputc('\n', stdout);

	free(path); return 0;

}

static void hlp(void) {

	puts("realpath - resolve an absolute pathname\n");

	puts("usage: realpath [file...]\n");

	puts("options:");

	puts("  --help     Display help information");

	puts("  --version  Display version information");

}

static void ver() {

	puts("OMKOV coreutils realpath, version " VERSION);

	puts("Copyright (C) 2020, Jakob Wakeling");

	puts("MIT Licence (https://opensource.org/licenses/MIT)");

}