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annotate toys/posix/pwd.c @ 776:cf101d432225

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Getting the pwd -L behavior right is fiddly.
author Rob Landley <rob@landley.net>
date Sun, 30 Dec 2012 04:43:11 -0600
parents adab8adf5f6d
children
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1 /* pwd.c - Print working directory.
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2 *
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3 * Copyright 2006 Rob Landley <rob@landley.net>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/pwd.html
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6
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7 USE_PWD(NEWTOY(pwd, ">0LP[-LP]", TOYFLAG_BIN))
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8
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9 config PWD
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10 bool "pwd"
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11 default y
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12 help
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13 usage: pwd [-L|-P]
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14
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15 Print working (current) directory.
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16
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17 -L Use shell's path from $PWD (when applicable)
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18 -P Print cannonical absolute path
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19 */
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21 #define FOR_pwd
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22 #include "toys.h"
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23
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24 void pwd_main(void)
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25 {
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26 char *s, *pwd = getcwd(0, 0), *PWD;
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28 // Only use $PWD if it's an absolute path alias for cwd with no "." or ".."
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29 if (!(toys.optflags & FLAG_P) && (s = PWD = getenv("PWD"))) {
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30 struct stat st1, st2;
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31
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32 while (*s == '/') {
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33 if (*(++s) == '.') {
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34 if (s[1] == '/' || !s[1]) break;
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35 if (s[1] == '.' && (s[2] == '/' || !s[2])) break;
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36 }
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37 while (*s && *s != '/') s++;
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38 }
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39 if (!*s && s != PWD) s = PWD;
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40 else s = NULL;
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42 // If current directory exists, make sure it matches.
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43 if (s && pwd)
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44 if (stat(pwd, &st1) || stat(PWD, &st2) || st1.st_ino != st2.st_ino ||
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45 st1.st_dev != st2.st_dev) s = NULL;
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46 } else s = NULL;
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47
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48 // If -L didn't give us a valid path, use cwd.
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49 if (!s && !(s = pwd)) perror_exit("xgetcwd");
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50
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51 xprintf("%s\n", s);
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52
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53 if (CFG_TOYBOX_FREE) free(pwd);
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54 }