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/* pwd.c - Print working directory.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/pwd.html
USE_PWD(NEWTOY(pwd, ">0LP[-LP]", TOYFLAG_BIN|TOYFLAG_MAYFORK))
config PWD
bool "pwd"
default y
help
usage: pwd [-L|-P]
Print working (current) directory.
-L Use shell's path from $PWD (when applicable)
-P Print canonical absolute path
*/
#define FOR_pwd
#include "toys.h"
void pwd_main(void)
{
char *s, *pwd = getcwd(0, 0), *PWD;
// Only use $PWD if it's an absolute path alias for cwd with no "." or ".."
if (!FLAG(P) && (s = PWD = getenv("PWD"))) {
struct stat st1, st2;
while (*s == '/') {
if (*(++s) == '.') {
if (s[1] == '/' || !s[1]) break;
if (s[1] == '.' && (s[2] == '/' || !s[2])) break;
}
while (*s && *s != '/') s++;
}
if (!*s && s != PWD) s = PWD;
else s = 0;
// If current directory exists, make sure it matches.
if (s && pwd)
if (stat(pwd, &st1) || stat(PWD, &st2) || st1.st_ino != st2.st_ino ||
st1.st_dev != st2.st_dev) s = 0;
} else s = 0;
// If -L didn't give us a valid path, use cwd.
if (s || (s = pwd)) puts(s);
free(pwd);
if (!s) perror_exit("xgetcwd");
}
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