87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini pwd implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//usage:#define pwd_trivial_usage
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//usage: ""
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//usage:#define pwd_full_usage "\n\n"
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//usage: "Print the full filename of the current working directory"
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//usage:
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//usage:#define pwd_example_usage
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//usage: "$ pwd\n"
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//usage: "/root\n"
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#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
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static int logical_getcwd(void)
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{
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struct stat st1;
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struct stat st2;
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char *wd;
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char *p;
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wd = getenv("PWD");
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if (!wd || wd[0] != '/')
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return 0;
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p = wd;
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while (*p) {
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/* doing strstr(p, "/.") by hand is smaller and faster... */
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if (*p++ != '/')
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continue;
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if (*p != '.')
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continue;
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/* we found "/.", skip to next char */
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p++;
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if (*p == '.')
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p++; /* we found "/.." */
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if (*p == '\0' || *p == '/')
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return 0; /* "/./" or "/../" component: bad */
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}
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if (stat(wd, &st1) != 0)
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return 0;
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if (stat(".", &st2) != 0)
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return 0;
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if (st1.st_ino != st2.st_ino)
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return 0;
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if (st1.st_dev != st2.st_dev)
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return 0;
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puts(wd);
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return 1;
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}
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int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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char *buf;
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if (ENABLE_DESKTOP) {
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/* TODO: assume -L if $POSIXLY_CORRECT? (coreutils does that)
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* Rationale:
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* POSIX requires a default of -L, but most scripts expect -P
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*/
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unsigned opt = getopt32(argv, "LP");
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if ((opt & 1) && logical_getcwd())
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return fflush_all();
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}
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buf = xrealloc_getcwd_or_warn(NULL);
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if (buf) {
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puts(buf);
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free(buf);
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return fflush_all();
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}
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return EXIT_FAILURE;
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}
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