diff options
Diffstat (limited to 'shell_cmds/pwd/pwd.c')
| -rw-r--r-- | shell_cmds/pwd/pwd.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/shell_cmds/pwd/pwd.c b/shell_cmds/pwd/pwd.c new file mode 100644 index 0000000..c5788b1 --- /dev/null +++ b/shell_cmds/pwd/pwd.c @@ -0,0 +1,127 @@ +/*- + * Copyright (c) 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if 0 +#ifndef lint +static char const copyright[] = +"@(#) Copyright (c) 1991, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94"; +#endif /* not lint */ +#endif +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/bin/pwd/pwd.c,v 1.25 2005/02/09 17:37:38 ru Exp $"); + +#include <sys/param.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <err.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +static char *getcwd_logical(void); +void usage(void); + +int +main(int argc, char *argv[]) +{ + int physical; + int ch; + char *p; + + // 4207130 + physical = 0; + while ((ch = getopt(argc, argv, "LP")) != -1) + switch (ch) { + case 'L': + physical = 0; + break; + case 'P': + physical = 1; + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (argc != 0) + usage(); + + /* + * If we're trying to find the logical current directory and that + * fails, behave as if -P was specified. + * + * 4701537: Only fall back if $PWD was actually wrong. We want to + * fail if the path is too long (errno == ENAMETOOLONG). + */ + if ((!physical && (p = getcwd_logical()) != NULL) || + ((physical || errno == ENOENT) && (p = getcwd(NULL, 0)) != NULL)) + printf("%s\n", p); + else + err(1, "."); + + exit(0); +} + +void +usage(void) +{ + + (void)fprintf(stderr, "usage: pwd [-L | -P]\n"); + exit(1); +} + +static char * +getcwd_logical(void) +{ + struct stat lg, phy; + char *pwd; + + /* + * Check that $PWD is an absolute logical pathname referring to + * the current working directory. + */ + if ((pwd = getenv("PWD")) != NULL && *pwd == '/') { + if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1) + return (NULL); + if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino) + return (pwd); + } + + errno = ENOENT; + return (NULL); +} |