src/builtins/pwd.c

   1 /*
   2     pwd.c - builtin pwd
   3     Copyright 2020 Zhang Maiyun.
   4
   5     This file is part of Psh, P shell.
   6
   7     Psh is free software: you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation, either version 3 of the License, or
  10     (at your option) any later version.
  11
  12     Psh is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19 */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "backend.h"
  30 #include "builtin.h"
  31 #include "libpsh/util.h"
  32 #include "libpsh/xmalloc.h"
  33 #include "variable.h"
  34
  35 int builtin_pwd(int argc, char **argv, psh_state *state)
  36 {
  37     int flag = 0;
  38     char *path = NULL;
  39     /* Ignore any args after [1]
  40     unless it is started by '-' as in bash */
  41     {
  42         int arg_count;
  43         for (arg_count = 1; argv[arg_count] && argv[arg_count][0] == '-';
  44              ++arg_count)
  45         {
  46             switch (argv[arg_count][1])
  47             {
  48                 case 'P':
  49                     flag = 1;
  50                     break;
  51                 case 'L':
  52                     break;
  53                 default: /* Invalid option */
  54                     OUT2E("%s: %s: -%c: invalid option\n", state->argv0,
  55                           argv[0], argv[arg_count][1]);
  56                     return 1;
  57             }
  58         }
  59     }
  60     if (!flag) /* No -P */
  61     {
  62         char *path = (char *)psh_vf_getstr(state, "PWD"), *p;
  63
  64         if (!path || path[0] != '/')
  65             goto use_p;
  66         p = path;
  67         while ((p = strstr(p, "/.")))
  68         {
  69             if (!p[2] || p[2] == '/' || (p[2] == '.' && (!p[3] || p[3] == '/')))
  70                 goto use_p;
  71             ++p;
  72         }
  73         puts(path);
  74         return 0;
  75     }
  76 use_p:
  77     path = psh_backend_getcwd_dm();
  78     puts(path);
  79     xfree(path);
  80     return 0;
  81 }