realpath.c (333fc21e3cd79bca0c94d7722c5a56cb5ad078d1) realpath.c (de216a83c249f840ed7ab77170e2f235aed2d937)
1/*
2 * Copyright (c) 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without

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47#include <errno.h>
48#include <fcntl.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include "un-namespace.h"
53
54/*
1/*
2 * Copyright (c) 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry.
7 *
8 * Redistribution and use in source and binary forms, with or without

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47#include <errno.h>
48#include <fcntl.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include "un-namespace.h"
53
54/*
55 * char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
55 * char *realpath(const char *path, char resolved_path[PATH_MAX]);
56 *
57 * Find the real name of path, by removing all ".", ".." and symlink
58 * components. Returns (resolved) on success, or (NULL) on failure,
59 * in which case the path which caused trouble is left in (resolved).
60 */
61char *
62realpath(path, resolved)
63 const char *path;
64 char *resolved;
65{
66 struct stat sb;
67 int fd, n, rootd, serrno;
56 *
57 * Find the real name of path, by removing all ".", ".." and symlink
58 * components. Returns (resolved) on success, or (NULL) on failure,
59 * in which case the path which caused trouble is left in (resolved).
60 */
61char *
62realpath(path, resolved)
63 const char *path;
64 char *resolved;
65{
66 struct stat sb;
67 int fd, n, rootd, serrno;
68 char *p, *q, wbuf[MAXPATHLEN];
68 char *p, *q, wbuf[PATH_MAX];
69 int symlinks = 0;
70
71 /* Save the starting point. */
72 if ((fd = _open(".", O_RDONLY)) < 0) {
73 (void)strcpy(resolved, ".");
74 return (NULL);
75 }
76
77 /*
78 * Find the dirname and basename from the path to be resolved.
79 * Change directory to the dirname component.
80 * lstat the basename part.
81 * if it is a symlink, read in the value and loop.
82 * if it is a directory, then change to that directory.
83 * get the current directory name and append the basename.
84 */
69 int symlinks = 0;
70
71 /* Save the starting point. */
72 if ((fd = _open(".", O_RDONLY)) < 0) {
73 (void)strcpy(resolved, ".");
74 return (NULL);
75 }
76
77 /*
78 * Find the dirname and basename from the path to be resolved.
79 * Change directory to the dirname component.
80 * lstat the basename part.
81 * if it is a symlink, read in the value and loop.
82 * if it is a directory, then change to that directory.
83 * get the current directory name and append the basename.
84 */
85 (void)strncpy(resolved, path, MAXPATHLEN - 1);
86 resolved[MAXPATHLEN - 1] = '\0';
85 (void)strncpy(resolved, path, PATH_MAX - 1);
86 resolved[PATH_MAX - 1] = '\0';
87loop:
88 q = strrchr(resolved, '/');
89 if (q != NULL) {
90 p = q + 1;
91 if (q == resolved)
92 q = "/";
93 else {
94 do {

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104
105 /* Deal with the last component. */
106 if (*p != '\0' && lstat(p, &sb) == 0) {
107 if (S_ISLNK(sb.st_mode)) {
108 if (++symlinks > MAXSYMLINKS) {
109 errno = ELOOP;
110 goto err1;
111 }
87loop:
88 q = strrchr(resolved, '/');
89 if (q != NULL) {
90 p = q + 1;
91 if (q == resolved)
92 q = "/";
93 else {
94 do {

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104
105 /* Deal with the last component. */
106 if (*p != '\0' && lstat(p, &sb) == 0) {
107 if (S_ISLNK(sb.st_mode)) {
108 if (++symlinks > MAXSYMLINKS) {
109 errno = ELOOP;
110 goto err1;
111 }
112 n = readlink(p, resolved, MAXPATHLEN - 1);
112 n = readlink(p, resolved, PATH_MAX - 1);
113 if (n < 0)
114 goto err1;
115 resolved[n] = '\0';
116 goto loop;
117 }
118 if (S_ISDIR(sb.st_mode)) {
119 if (chdir(p) < 0)
120 goto err1;
121 p = "";
122 }
123 }
124
125 /*
126 * Save the last component name and get the full pathname of
127 * the current directory.
128 */
129 (void)strcpy(wbuf, p);
113 if (n < 0)
114 goto err1;
115 resolved[n] = '\0';
116 goto loop;
117 }
118 if (S_ISDIR(sb.st_mode)) {
119 if (chdir(p) < 0)
120 goto err1;
121 p = "";
122 }
123 }
124
125 /*
126 * Save the last component name and get the full pathname of
127 * the current directory.
128 */
129 (void)strcpy(wbuf, p);
130 if (getcwd(resolved, MAXPATHLEN) == 0)
130 if (getcwd(resolved, PATH_MAX) == 0)
131 goto err1;
132
133 /*
134 * Join the two strings together, ensuring that the right thing
135 * happens if the last component is empty, or the dirname is root.
136 */
137 if (resolved[0] == '/' && resolved[1] == '\0')
138 rootd = 1;
139 else
140 rootd = 0;
141
142 if (*wbuf) {
131 goto err1;
132
133 /*
134 * Join the two strings together, ensuring that the right thing
135 * happens if the last component is empty, or the dirname is root.
136 */
137 if (resolved[0] == '/' && resolved[1] == '\0')
138 rootd = 1;
139 else
140 rootd = 0;
141
142 if (*wbuf) {
143 if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
143 if (strlen(resolved) + strlen(wbuf) + rootd + 1 > PATH_MAX) {
144 errno = ENAMETOOLONG;
145 goto err1;
146 }
147 if (rootd == 0)
148 (void)strcat(resolved, "/");
149 (void)strcat(resolved, wbuf);
150 }
151

--- 16 unchanged lines hidden --- 		144 errno = ENAMETOOLONG;
145 goto err1;
146 }
147 if (rootd == 0)
148 (void)strcat(resolved, "/");
149 (void)strcat(resolved, wbuf);
150 }
151

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