merge from Lite2 - realpath() now shares a lot of code with getcwd()
and is now in the same file.
This commit is contained in:
Peter Wemm
parent
5faf00b5da
commit
9dc1164189
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@ -1,7 +1,10 @@
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/*
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* Copyright (c) 1989, 1991, 1993
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* Copyright (c) 1989, 1991, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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@ -32,19 +35,22 @@
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getcwd.c 8.1 (Berkeley) 6/4/93";
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static char sccsid[] = "@(#)getcwd.c 8.5 (Berkeley) 2/7/95";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static char *getcwd_physical __P((char *, size_t));
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#define ISDOT(dp) \
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(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
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(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
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@ -53,6 +59,154 @@ char *
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getcwd(pt, size)
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char *pt;
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size_t size;
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{
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char *pwd;
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size_t pwdlen;
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dev_t dev;
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ino_t ino;
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struct stat s;
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/* Check $PWD -- if it's right, it's fast. */
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if ((pwd = getenv("PWD")) != NULL && pwd[0] == '/' && !stat(pwd, &s)) {
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dev = s.st_dev;
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ino = s.st_ino;
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if (!stat(".", &s) && dev == s.st_dev && ino == s.st_ino) {
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pwdlen = strlen(pwd);
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if (size != 0) {
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if (pwdlen + 1 > size) {
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errno = ERANGE;
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return (NULL);
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}
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} else if ((pt = malloc(pwdlen + 1)) == NULL)
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return (NULL);
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memmove(pt, pwd, pwdlen);
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pt[pwdlen] = '\0';
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return (pt);
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}
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}
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return (getcwd_physical(pt, size));
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}
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/*
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* char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
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*
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* Find the real name of path, by removing all ".", ".." and symlink
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* components. Returns (resolved) on success, or (NULL) on failure,
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* in which case the path which caused trouble is left in (resolved).
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*/
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char *
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realpath(path, resolved)
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const char *path;
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char *resolved;
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{
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struct stat sb;
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int fd, n, rootd, serrno;
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char *p, *q, wbuf[MAXPATHLEN];
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/* Save the starting point. */
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if ((fd = open(".", O_RDONLY)) < 0) {
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(void)strcpy(resolved, ".");
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return (NULL);
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}
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/*
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* Find the dirname and basename from the path to be resolved.
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* Change directory to the dirname component.
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* lstat the basename part.
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* if it is a symlink, read in the value and loop.
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* if it is a directory, then change to that directory.
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* get the current directory name and append the basename.
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*/
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(void)strncpy(resolved, path, MAXPATHLEN - 1);
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resolved[MAXPATHLEN - 1] = '\0';
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loop:
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q = strrchr(resolved, '/');
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if (q != NULL) {
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p = q + 1;
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if (q == resolved)
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q = "/";
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else {
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do {
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--q;
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} while (q > resolved && *q == '/');
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q[1] = '\0';
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q = resolved;
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}
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if (chdir(q) < 0)
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goto err1;
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} else
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p = resolved;
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/* Deal with the last component. */
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if (*p != '\0' && lstat(p, &sb) == 0) {
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if (S_ISLNK(sb.st_mode)) {
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n = readlink(p, resolved, MAXPATHLEN);
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if (n < 0)
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goto err1;
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resolved[n] = '\0';
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goto loop;
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}
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if (S_ISDIR(sb.st_mode)) {
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if (chdir(p) < 0)
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goto err1;
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p = "";
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}
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}
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/*
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* Save the last component name and get the full pathname of
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* the current directory.
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*/
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(void)strcpy(wbuf, p);
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/*
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* Call the inernal internal version of getcwd which
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* does a physical search rather than using the $PWD short-cut
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*/
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if (getcwd_physical(resolved, MAXPATHLEN) == 0)
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goto err1;
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/*
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* Join the two strings together, ensuring that the right thing
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* happens if the last component is empty, or the dirname is root.
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*/
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if (resolved[0] == '/' && resolved[1] == '\0')
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rootd = 1;
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else
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rootd = 0;
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if (*wbuf) {
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if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
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errno = ENAMETOOLONG;
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goto err1;
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}
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if (rootd == 0)
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(void)strcat(resolved, "/");
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(void)strcat(resolved, wbuf);
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}
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/* Go back to where we came from. */
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if (fchdir(fd) < 0) {
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serrno = errno;
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goto err2;
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}
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/* It's okay if the close fails, what's an fd more or less? */
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(void)close(fd);
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return (resolved);
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err1: serrno = errno;
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(void)fchdir(fd);
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err2: (void)close(fd);
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errno = serrno;
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return (NULL);
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}
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static char *
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getcwd_physical(pt, size)
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char *pt;
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size_t size;
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{
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register struct dirent *dp;
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register DIR *dir;
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@ -94,7 +248,7 @@ getcwd(pt, size)
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/*
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* Allocate bytes (1024 - malloc space) for the string of "../"'s.
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* Should always be enough (it's 340 levels). If it's not, allocate
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* as necessary. Special * case the first stat, it's ".", not "..".
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* as necessary. Special case the first stat, it's ".", not "..".
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*/
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if ((up = malloc(upsize = 1024 - 4)) == NULL)
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goto err;
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@ -1,125 +0,0 @@
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.\" Copyright (c) 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Jan-Simon Pendry.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)realpath.3 8.2 (Berkeley) 2/16/94
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.\"
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.Dd "February 16, 1994"
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.Dt REALPATH 3
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.Os
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.Sh NAME
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.Nm realpath
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.Nd returns the canonicalized absolute pathname
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <stdlib.h>
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.Ft "char *"
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.Fn realpath "const char *pathname" "char resolvedname[MAXPATHLEN]"
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.Sh DESCRIPTION
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The
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.Fn realpath
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function resolves all symbolic links, extra
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.Dq /
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characters and references to
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.Pa /./
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and
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.Pa /../
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in
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.Fa pathname ,
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and copies the resulting absolute pathname into
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the memory referenced by
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.Fa resolvedname .
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The
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.Fa resolvedname
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argument
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.Em must
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refer to a buffer capable of storing at least
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.Dv MAXPATHLEN
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characters.
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.Pp
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The
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.Fn realpath
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function will resolve both absolute and relative paths
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and return the absolute pathname corresponding to
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.Fa pathname .
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All but the last component of
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.Fa pathname
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must exist when
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.Fn realpath
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is called.
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.Sh "RETURN VALUES"
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The
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.Fn realpath
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function returns
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.Fa resolved_name
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on success.
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If an error occurs,
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.Fn realpath
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returns
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.Dv NULL ,
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and
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.Fa resolved_name
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contains the pathname which caused the problem.
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.Sh ERRORS
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The function
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.Fn realpath
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may fail and set the external variable
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.Va errno
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for any of the errors specified for the library functions
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.Xr chdir 2 ,
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.Xr close 2 ,
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.Xr fchdir 2 ,
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.Xr lstat 2 ,
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.Xr open 2 ,
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.Xr readlink 2
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and
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.Xr getcwd 3 .
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.Sh CAVEATS
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This implementation of
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.Fn realpath
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differs slightly from the Solaris implementation.
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The
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.Bx 4.4
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version always returns absolute pathnames,
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whereas the Solaris implementation will,
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under certain circumstances, return a relative
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.Fa resolved_path
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when given a relative
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.Fa pathname .
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.Sh "SEE ALSO"
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.Xr getcwd 3
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.Sh HISTORY
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The
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.Fn realpath
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function call first appeared in
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.Bx 4.4 .
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@ -1,158 +0,0 @@
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/*
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* 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
|
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* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 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.
|
||||
*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)realpath.c 8.1 (Berkeley) 2/16/94";
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#endif /* LIBC_SCCS and not lint */
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|
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#include <sys/param.h>
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#include <sys/stat.h>
|
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|
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#include <errno.h>
|
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#include <fcntl.h>
|
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#include <stdlib.h>
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#include <string.h>
|
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#include <unistd.h>
|
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|
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/*
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* char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
|
||||
*
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* Find the real name of path, by removing all ".", ".." and symlink
|
||||
* components. Returns (resolved) on success, or (NULL) on failure,
|
||||
* in which case the path which caused trouble is left in (resolved).
|
||||
*/
|
||||
char *
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realpath(path, resolved)
|
||||
const char *path;
|
||||
char *resolved;
|
||||
{
|
||||
struct stat sb;
|
||||
int fd, n, rootd, serrno;
|
||||
char *p, *q, wbuf[MAXPATHLEN];
|
||||
|
||||
/* Save the starting point. */
|
||||
if ((fd = open(".", O_RDONLY)) < 0) {
|
||||
(void)strcpy(resolved, ".");
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
/*
|
||||
* Find the dirname and basename from the path to be resolved.
|
||||
* Change directory to the dirname component.
|
||||
* lstat the basename part.
|
||||
* if it is a symlink, read in the value and loop.
|
||||
* if it is a directory, then change to that directory.
|
||||
* get the current directory name and append the basename.
|
||||
*/
|
||||
(void)strncpy(resolved, path, MAXPATHLEN - 1);
|
||||
resolved[MAXPATHLEN - 1] = '\0';
|
||||
loop:
|
||||
q = strrchr(resolved, '/');
|
||||
if (q != NULL) {
|
||||
p = q + 1;
|
||||
if (q == resolved)
|
||||
q = "/";
|
||||
else {
|
||||
do {
|
||||
--q;
|
||||
} while (q > resolved && *q == '/');
|
||||
q[1] = '\0';
|
||||
q = resolved;
|
||||
}
|
||||
if (chdir(q) < 0)
|
||||
goto err1;
|
||||
} else
|
||||
p = resolved;
|
||||
|
||||
/* Deal with the last component. */
|
||||
if (*p != '\0' && lstat(p, &sb) == 0) {
|
||||
if (S_ISLNK(sb.st_mode)) {
|
||||
n = readlink(p, resolved, MAXPATHLEN);
|
||||
if (n < 0)
|
||||
goto err1;
|
||||
resolved[n] = '\0';
|
||||
goto loop;
|
||||
}
|
||||
if (S_ISDIR(sb.st_mode)) {
|
||||
if (chdir(p) < 0)
|
||||
goto err1;
|
||||
p = "";
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Save the last component name and get the full pathname of
|
||||
* the current directory.
|
||||
*/
|
||||
(void)strcpy(wbuf, p);
|
||||
if (getcwd(resolved, MAXPATHLEN) == 0)
|
||||
goto err1;
|
||||
|
||||
/*
|
||||
* Join the two strings together, ensuring that the right thing
|
||||
* happens if the last component is empty, or the dirname is root.
|
||||
*/
|
||||
if (resolved[0] == '/' && resolved[1] == '\0')
|
||||
rootd = 1;
|
||||
else
|
||||
rootd = 0;
|
||||
|
||||
if (*wbuf) {
|
||||
if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
|
||||
errno = ENAMETOOLONG;
|
||||
goto err1;
|
||||
}
|
||||
if (rootd == 0)
|
||||
(void)strcat(resolved, "/");
|
||||
(void)strcat(resolved, wbuf);
|
||||
}
|
||||
|
||||
/* Go back to where we came from. */
|
||||
if (fchdir(fd) < 0) {
|
||||
serrno = errno;
|
||||
goto err2;
|
||||
}
|
||||
|
||||
/* It's okay if the close fails, what's an fd more or less? */
|
||||
(void)close(fd);
|
||||
return (resolved);
|
||||
|
||||
err1: serrno = errno;
|
||||
(void)fchdir(fd);
|
||||
err2: (void)close(fd);
|
||||
errno = serrno;
|
||||
return (NULL);
|
||||
}
|
||||
Loading…
Reference in New Issue