coreutils

// pwd.c, version 1.0.1

// OMKOV coreutils implementation of POSIX pwd

// Copyright (C) 2020, Jakob Wakeling

// MIT Licence

#include "util/error.h"

#include "util/optget.h"

#include <unistd.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 int mode = 0;

static void hlp(void);

static void ver(void);

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

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

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

	case 'L': { mode = 0; break; }

	case 'P': { mode = 1; break; }

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

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

	default: { return 1; }

	}

pwd:;

	char *cwd = mode ? getcwd(NULL, 0) : getenv("PWD");

	if (!cwd && !mode) { mode = 1; goto pwd; }

	else if (!cwd) { error(1, "%s", av[0]); }

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

	if (mode) { free(cwd); } return 0;

}

static void hlp(void) {

	puts("pwd - print working directory name\n");

	puts("usage: pwd [-L|-P]\n");

	puts("options:");

	puts("  -L         Display the logical current working directory");

	puts("  -P         Display the physical current working directory");

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

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

}

static void ver(void) {

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

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

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

}