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annotate lib/careadlinkat.c @ 17324:b1b7de2c4a71

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careadlinkat: stop exporting careadlinkatcwd Only Emacs used it directly, and Emacs no longer needs it. * NEWS: Document this simplification. * lib/areadlink.c (careadlinkatcwd): Move here from careadlinkat.c, and make it static. Include <stdlib.h>, for abort, and unistd.h, for readlink. * lib/careadlinkat.c (careadlinkatcwd): Move to areadlink.c. Don't include stdlib.h; no longer needed. * lib/careadlinkat.h (careadlinkatcwd): Remove decl. * lib/relocwrapper.c: Adjust comment to match new dependencies. * modules/areadlink (Depends-on): Add readlink. (Maintainer): Add self. * modules/careadlinkat (Depends-on): Remove readlink.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 08 Feb 2013 15:12:36 -0800
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Read symbolic links into a buffer without size limitation, relative to fd.
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2
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3 Copyright (C) 2001, 2003-2004, 2007, 2009-2013 Free Software Foundation,
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4 Inc.
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 /* Written by Paul Eggert, Bruno Haible, and Jim Meyering. */
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20
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21 #include <config.h>
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22
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23 #include "careadlinkat.h"
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24
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25 #include <errno.h>
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26 #include <limits.h>
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27 #include <string.h>
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28 #include <unistd.h>
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29
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30 /* Define this independently so that stdint.h is not a prerequisite. */
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31 #ifndef SIZE_MAX
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32 # define SIZE_MAX ((size_t) -1)
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33 #endif
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34
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35 #ifndef SSIZE_MAX
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36 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
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37 #endif
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38
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39 #include "allocator.h"
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40
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41 /* Assuming the current directory is FD, get the symbolic link value
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42 of FILENAME as a null-terminated string and put it into a buffer.
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43 If FD is AT_FDCWD, FILENAME is interpreted relative to the current
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44 working directory, as in openat.
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45
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46 If the link is small enough to fit into BUFFER put it there.
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47 BUFFER's size is BUFFER_SIZE, and BUFFER can be null
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48 if BUFFER_SIZE is zero.
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49
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50 If the link is not small, put it into a dynamically allocated
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51 buffer managed by ALLOC. It is the caller's responsibility to free
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52 the returned value if it is nonnull and is not BUFFER. A null
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53 ALLOC stands for the standard allocator.
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54
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55 The PREADLINKAT function specifies how to read links. It operates
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56 like POSIX readlinkat()
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57 <http://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html>
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58 but can assume that its first argument is the same as FD.
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59
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60 If successful, return the buffer address; otherwise return NULL and
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61 set errno. */
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62
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63 char *
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64 careadlinkat (int fd, char const *filename,
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65 char *buffer, size_t buffer_size,
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66 struct allocator const *alloc,
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67 ssize_t (*preadlinkat) (int, char const *, char *, size_t))
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68 {
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69 char *buf;
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70 size_t buf_size;
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71 size_t buf_size_max =
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72 SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
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73 char stack_buf[1024];
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74
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75 if (! alloc)
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76 alloc = &stdlib_allocator;
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77
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78 if (! buffer_size)
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79 {
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80 /* Allocate the initial buffer on the stack. This way, in the
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81 common case of a symlink of small size, we get away with a
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82 single small malloc() instead of a big malloc() followed by a
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83 shrinking realloc(). */
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84 buffer = stack_buf;
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85 buffer_size = sizeof stack_buf;
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86 }
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87
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88 buf = buffer;
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89 buf_size = buffer_size;
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90
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91 do
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92 {
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93 /* Attempt to read the link into the current buffer. */
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94 ssize_t link_length = preadlinkat (fd, filename, buf, buf_size);
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95 size_t link_size;
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96 if (link_length < 0)
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97 {
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98 /* On AIX 5L v5.3 and HP-UX 11i v2 04/09, readlink returns -1
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99 with errno == ERANGE if the buffer is too small. */
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100 int readlinkat_errno = errno;
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101 if (readlinkat_errno != ERANGE)
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102 {
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103 if (buf != buffer)
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104 {
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105 alloc->free (buf);
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106 errno = readlinkat_errno;
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107 }
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108 return NULL;
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109 }
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110 }
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111
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112 link_size = link_length;
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113
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114 if (link_size < buf_size)
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115 {
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116 buf[link_size++] = '\0';
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117
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118 if (buf == stack_buf)
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119 {
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120 char *b = (char *) alloc->allocate (link_size);
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121 buf_size = link_size;
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122 if (! b)
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123 break;
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124 memcpy (b, buf, link_size);
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125 buf = b;
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126 }
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127 else if (link_size < buf_size && buf != buffer && alloc->reallocate)
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128 {
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129 /* Shrink BUF before returning it. */
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130 char *b = (char *) alloc->reallocate (buf, link_size);
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131 if (b)
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132 buf = b;
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133 }
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134
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135 return buf;
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136 }
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137
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138 if (buf != buffer)
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139 alloc->free (buf);
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140
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141 if (buf_size <= buf_size_max / 2)
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142 buf_size *= 2;
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143 else if (buf_size < buf_size_max)
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144 buf_size = buf_size_max;
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145 else if (buf_size_max < SIZE_MAX)
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146 {
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147 errno = ENAMETOOLONG;
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148 return NULL;
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149 }
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150 else
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151 break;
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152 buf = (char *) alloc->allocate (buf_size);
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153 }
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154 while (buf);
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155
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156 if (alloc->die)
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157 alloc->die (buf_size);
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158 errno = ENOMEM;
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159 return NULL;
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160 }