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📄 Makefile.inc(2.73 KB)
📄 Symbol.map(1.38 KB)
📄 _Exit.c(529 B)
📄 a64l.3(4.79 KB)
📄 a64l.c(846 B)
📄 abort.3(2.55 KB)
📄 abort.c(2.76 KB)
📄 abs.3(2.36 KB)
📄 abs.c(1.84 KB)
📄 alloca.3(2.8 KB)
📄 at_quick_exit.3(2.12 KB)
📄 atexit.3(3.25 KB)
📄 atexit.c(6.73 KB)
📄 atexit.h(1.76 KB)
📄 atof.3(2.77 KB)
📄 atof.c(2.17 KB)
📄 atoi.3(2.59 KB)
📄 atoi.c(2.16 KB)
📄 atol.3(3.16 KB)
📄 atol.c(2.17 KB)
📄 atoll.c(2.05 KB)
📄 bsearch.3(4.53 KB)
📄 bsearch.c(3.35 KB)
📄 bsearch_b.c(1.38 KB)
📄 cxa_thread_atexit.c(1.67 KB)
📄 cxa_thread_atexit_impl.c(4.63 KB)
📄 div.3(2.22 KB)
📄 div.c(3 KB)
📄 exit.3(3.66 KB)
📄 exit.c(2.72 KB)
📄 getenv.3(5.32 KB)
📄 getenv.c(17.03 KB)
📄 getopt.3(7.57 KB)
📄 getopt.c(4.22 KB)
📄 getopt_long.3(11.45 KB)
📄 getopt_long.c(16.41 KB)
📄 getsubopt.3(3.98 KB)
📄 getsubopt.c(3.13 KB)
📄 hcreate.3(7.04 KB)
📄 hcreate.c(2.23 KB)
📄 hcreate_r.c(2.27 KB)
📄 hdestroy_r.c(1.6 KB)
📄 heapsort.c(6.63 KB)
📄 heapsort_b.c(1.38 KB)
📄 hsearch.h(1.63 KB)
📄 hsearch_r.c(4.36 KB)
📄 imaxabs.3(1.92 KB)
📄 imaxabs.c(1.52 KB)
📄 imaxdiv.3(2.09 KB)
📄 imaxdiv.c(1.81 KB)
📄 insque.3(1.13 KB)
📄 insque.c(925 B)
📁 jemalloc
📄 l64a.c(726 B)
📄 labs.3(2.28 KB)
📄 labs.c(1.85 KB)
📄 ldiv.3(2.34 KB)
📄 ldiv.c(2.17 KB)
📄 llabs.3(1.91 KB)
📄 llabs.c(1.52 KB)
📄 lldiv.3(2.08 KB)
📄 lldiv.c(1.8 KB)
📄 lsearch.3(2.9 KB)
📄 lsearch.c(1.47 KB)
📄 memory.3(2.48 KB)
📄 merge.c(9.27 KB)
📄 mergesort_b.c(1.38 KB)
📄 ptsname.3(4.64 KB)
📄 ptsname.c(3.29 KB)
📄 qsort.3(9.67 KB)
📄 qsort.c(6.32 KB)
📄 qsort_r.c(430 B)
📄 qsort_s.c(147 B)
📄 quick_exit.3(2.13 KB)
📄 quick_exit.c(2.53 KB)
📄 radixsort.3(4.35 KB)
📄 radixsort.c(7.89 KB)
📄 rand.3(4.31 KB)
📄 rand.c(4.58 KB)
📄 random.3(5.11 KB)
📄 random.c(17.58 KB)
📄 random.h(2.91 KB)
📄 reallocarray.3(3.75 KB)
📄 reallocarray.c(1.38 KB)
📄 reallocf.3(2.72 KB)
📄 reallocf.c(1.83 KB)
📄 realpath.3(3.73 KB)
📄 realpath.c(6.32 KB)
📄 remque.c(581 B)
📄 set_constraint_handler_s.3(3.96 KB)
📄 set_constraint_handler_s.c(2.91 KB)
📄 strfmon.3(4.83 KB)
📄 strfmon.c(16.2 KB)
📄 strtod.3(5.87 KB)
📄 strtoimax.c(4.77 KB)
📄 strtol.3(5.26 KB)
📄 strtol.c(4.7 KB)
📄 strtold.c(1.71 KB)
📄 strtoll.c(4.77 KB)
📄 strtonum.3(3.45 KB)
📄 strtonum.c(1.79 KB)
📄 strtoq.c(1.97 KB)
📄 strtoul.3(5.17 KB)
📄 strtoul.c(3.72 KB)
📄 strtoull.c(3.75 KB)
📄 strtoumax.c(3.72 KB)
📄 strtouq.c(1.98 KB)
📄 system.3(3.09 KB)
📄 system.c(3.8 KB)
📄 tdelete.c(5.53 KB)
📄 tfind.c(1.06 KB)
📄 tsearch.3(5.43 KB)
📄 tsearch.c(5.01 KB)
📄 tsearch_path.h(2.8 KB)
📄 twalk.c(1.18 KB)

Editing: realpath.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
 *
 * 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.
 * 3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)realpath.c	8.1 (Berkeley) 2/16/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "namespace.h"
#include <sys/param.h>
#include <sys/stat.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "un-namespace.h"
#include "libc_private.h"

extern int __realpathat(int fd, const char *path, char *buf, size_t size,
    int flags);

/*
 * 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).
 */
static char * __noinline
realpath1(const char *path, char *resolved)
{
	struct stat sb;
	char *p, *q;
	size_t left_len, resolved_len, next_token_len;
	unsigned symlinks;
	ssize_t slen;
	char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX];

symlinks = 0;
	if (path[0] == '/') {
		resolved[0] = '/';
		resolved[1] = '\0';
		if (path[1] == '\0')
			return (resolved);
		resolved_len = 1;
		left_len = strlcpy(left, path + 1, sizeof(left));
	} else {
		if (getcwd(resolved, PATH_MAX) == NULL) {
			resolved[0] = '.';
			resolved[1] = '\0';
			return (NULL);
		}
		resolved_len = strlen(resolved);
		left_len = strlcpy(left, path, sizeof(left));
	}
	if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) {
		errno = ENAMETOOLONG;
		return (NULL);
	}

/*
	 * Iterate over path components in `left'.
	 */
	while (left_len != 0) {
		/*
		 * Extract the next path component and adjust `left'
		 * and its length.
		 */
		p = strchr(left, '/');

next_token_len = p != NULL ? (size_t)(p - left) : left_len;
		memcpy(next_token, left, next_token_len);
		next_token[next_token_len] = '\0';

if (p != NULL) {
			left_len -= next_token_len + 1;
			memmove(left, p + 1, left_len + 1);
		} else {
			left[0] = '\0';
			left_len = 0;
		}

if (resolved[resolved_len - 1] != '/') {
			if (resolved_len + 1 >= PATH_MAX) {
				errno = ENAMETOOLONG;
				return (NULL);
			}
			resolved[resolved_len++] = '/';
			resolved[resolved_len] = '\0';
		}
		if (next_token[0] == '\0') {
			/* Handle consequential slashes. */
			continue;
		} else if (strcmp(next_token, ".") == 0) {
			continue;
		} else if (strcmp(next_token, "..") == 0) {
			/*
			 * Strip the last path component except when we have
			 * single "/"
			 */
			if (resolved_len > 1) {
				resolved[resolved_len - 1] = '\0';
				q = strrchr(resolved, '/') + 1;
				*q = '\0';
				resolved_len = q - resolved;
			}
			continue;
		}

/*
		 * Append the next path component and lstat() it.
		 */
		resolved_len = strlcat(resolved, next_token, PATH_MAX);
		if (resolved_len >= PATH_MAX) {
			errno = ENAMETOOLONG;
			return (NULL);
		}
		if (lstat(resolved, &sb) != 0)
			return (NULL);
		if (S_ISLNK(sb.st_mode)) {
			if (symlinks++ > MAXSYMLINKS) {
				errno = ELOOP;
				return (NULL);
			}
			slen = readlink(resolved, symlink, sizeof(symlink));
			if (slen <= 0 || slen >= (ssize_t)sizeof(symlink)) {
				if (slen < 0)
					; /* keep errno from readlink(2) call */
				else if (slen == 0)
					errno = ENOENT;
				else
					errno = ENAMETOOLONG;
				return (NULL);
			}
			symlink[slen] = '\0';
			if (symlink[0] == '/') {
				resolved[1] = 0;
				resolved_len = 1;
			} else {
				/* Strip the last path component. */
				q = strrchr(resolved, '/') + 1;
				*q = '\0';
				resolved_len = q - resolved;
			}

/*
			 * If there are any path components left, then
			 * append them to symlink. The result is placed
			 * in `left'.
			 */
			if (p != NULL) {
				if (symlink[slen - 1] != '/') {
					if (slen + 1 >= (ssize_t)sizeof(symlink)) {
						errno = ENAMETOOLONG;
						return (NULL);
					}
					symlink[slen] = '/';
					symlink[slen + 1] = 0;
				}
				left_len = strlcat(symlink, left,
				    sizeof(symlink));
				if (left_len >= sizeof(symlink)) {
					errno = ENAMETOOLONG;
					return (NULL);
				}
			}
			left_len = strlcpy(left, symlink, sizeof(left));
		} else if (!S_ISDIR(sb.st_mode) && p != NULL) {
			errno = ENOTDIR;
			return (NULL);
		}
	}

/*
	 * Remove trailing slash except when the resolved pathname
	 * is a single "/".
	 */
	if (resolved_len > 1 && resolved[resolved_len - 1] == '/')
		resolved[resolved_len - 1] = '\0';
	return (resolved);
}

char *
realpath(const char * __restrict path, char * __restrict resolved)
{
	char *m, *res;

if (path == NULL) {
		errno = EINVAL;
		return (NULL);
	}
	if (path[0] == '\0') {
		errno = ENOENT;
		return (NULL);
	}
	if (resolved != NULL) {
		m = NULL;
	} else {
		m = resolved = malloc(PATH_MAX);
		if (resolved == NULL)
			return (NULL);
	}
	if (__getosreldate() >= 1300080) {
		if (__realpathat(AT_FDCWD, path, resolved, PATH_MAX, 0) == 0)
			return (resolved);
	}
	res = realpath1(path, resolved);
	if (res == NULL)
		free(m);
	return (res);
}

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Editing: realpath.c

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