sbase

suckless unix tools
git clone git@git.2f30.org/sbase.git
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pwd.c (833B)


      1 /* See LICENSE file for copyright and license details. */
      2 #include <sys/stat.h>
      3 
      4 #include <stdio.h>
      5 #include <stdlib.h>
      6 #include <unistd.h>
      7 
      8 #include "util.h"
      9 
     10 static const char *
     11 getpwd(const char *cwd)
     12 {
     13 	const char *pwd;
     14 	struct stat cst, pst;
     15 
     16 	if (!(pwd = getenv("PWD")) || pwd[0] != '/' || stat(pwd, &pst) < 0)
     17 		return cwd;
     18 	if (stat(cwd, &cst) < 0)
     19 		eprintf("stat %s:", cwd);
     20 
     21 	return (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) ? pwd : cwd;
     22 }
     23 
     24 static void
     25 usage(void)
     26 {
     27 	eprintf("usage: %s [-LP]\n", argv0);
     28 }
     29 
     30 int
     31 main(int argc, char *argv[])
     32 {
     33 	char cwd[PATH_MAX];
     34 	char mode = 'L';
     35 
     36 	ARGBEGIN {
     37 	case 'L':
     38 	case 'P':
     39 		mode = ARGC();
     40 		break;
     41 	default:
     42 		usage();
     43 	} ARGEND
     44 
     45 	if (!getcwd(cwd, sizeof(cwd)))
     46 		eprintf("getcwd:");
     47 	puts((mode == 'L') ? getpwd(cwd) : cwd);
     48 
     49 	return fshut(stdout, "<stdout>");
     50 }