pwd.c - sbase - suckless unix tools
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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 }