Mercurial > hg > CbC > CbC_gcc
annotate libiberty/setenv.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 145 | 1 /* Copyright (C) 1992-2020 Free Software Foundation, Inc. |
| 0 | 2 This file based on setenv.c in the GNU C Library. |
| 3 | |
| 4 The GNU C Library is free software; you can redistribute it and/or | |
| 5 modify it under the terms of the GNU Library General Public License as | |
| 6 published by the Free Software Foundation; either version 2 of the | |
| 7 License, or (at your option) any later version. | |
| 8 | |
| 9 The GNU C Library is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 Library General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU Library General Public | |
| 15 License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 16 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, | |
| 17 Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 | |
| 20 /* | |
| 21 | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
22 @deftypefn Supplemental int setenv (const char *@var{name}, @ |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
23 const char *@var{value}, int @var{overwrite}) |
| 0 | 24 @deftypefnx Supplemental void unsetenv (const char *@var{name}) |
| 25 | |
| 26 @code{setenv} adds @var{name} to the environment with value | |
| 27 @var{value}. If the name was already present in the environment, | |
| 28 the new value will be stored only if @var{overwrite} is nonzero. | |
| 29 The companion @code{unsetenv} function removes @var{name} from the | |
| 30 environment. This implementation is not safe for multithreaded code. | |
| 31 | |
| 32 @end deftypefn | |
| 33 | |
| 34 */ | |
| 35 | |
| 36 #if HAVE_CONFIG_H | |
| 37 # include <config.h> | |
| 38 #endif | |
| 39 | |
| 40 #define setenv libiberty_setenv | |
| 41 #define unsetenv libiberty_unsetenv | |
| 42 | |
| 43 #include "ansidecl.h" | |
| 44 #include <sys/types.h> /* For `size_t' */ | |
| 45 #include <stdio.h> /* For `NULL' */ | |
| 46 | |
| 47 #include <errno.h> | |
| 48 #if !defined(errno) && !defined(HAVE_ERRNO_DECL) | |
| 49 extern int errno; | |
| 50 #endif | |
| 51 #define __set_errno(ev) ((errno) = (ev)) | |
| 52 | |
| 53 #if HAVE_STDLIB_H | |
| 54 # include <stdlib.h> | |
| 55 #endif | |
| 56 #if HAVE_STRING_H | |
| 57 # include <string.h> | |
| 58 #endif | |
| 59 #if HAVE_UNISTD_H | |
| 60 # include <unistd.h> | |
| 61 #endif | |
| 62 | |
| 63 #define __environ environ | |
| 111 | 64 #include "environ.h" |
| 0 | 65 |
| 66 #undef setenv | |
| 67 #undef unsetenv | |
| 68 | |
| 69 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty | |
| 70 * implementation MT-Unsafe. */ | |
| 71 #define LOCK | |
| 72 #define UNLOCK | |
| 73 | |
| 74 /* Below this point, it's verbatim code from the glibc-2.0 implementation */ | |
| 75 | |
| 76 /* If this variable is not a null pointer we allocated the current | |
| 77 environment. */ | |
| 78 static char **last_environ; | |
| 79 | |
| 80 | |
| 81 int | |
| 82 setenv (const char *name, const char *value, int replace) | |
| 83 { | |
| 84 register char **ep = 0; | |
| 85 register size_t size; | |
| 86 const size_t namelen = strlen (name); | |
| 87 const size_t vallen = strlen (value) + 1; | |
| 88 | |
| 89 LOCK; | |
| 90 | |
| 91 size = 0; | |
| 92 if (__environ != NULL) | |
| 93 { | |
| 94 for (ep = __environ; *ep != NULL; ++ep) | |
| 95 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=') | |
| 96 break; | |
| 97 else | |
| 98 ++size; | |
| 99 } | |
| 100 | |
| 101 if (__environ == NULL || *ep == NULL) | |
| 102 { | |
| 103 char **new_environ; | |
| 104 if (__environ == last_environ && __environ != NULL) | |
| 105 /* We allocated this space; we can extend it. */ | |
| 106 new_environ = (char **) realloc (last_environ, | |
| 107 (size + 2) * sizeof (char *)); | |
| 108 else | |
| 109 new_environ = (char **) malloc ((size + 2) * sizeof (char *)); | |
| 110 | |
| 111 if (new_environ == NULL) | |
| 112 { | |
| 113 UNLOCK; | |
| 114 return -1; | |
| 115 } | |
| 116 | |
| 117 new_environ[size] = (char *) malloc (namelen + 1 + vallen); | |
| 118 if (new_environ[size] == NULL) | |
| 119 { | |
| 120 free ((char *) new_environ); | |
| 121 __set_errno (ENOMEM); | |
| 122 UNLOCK; | |
| 123 return -1; | |
| 124 } | |
| 125 | |
| 126 if (__environ != last_environ) | |
| 127 memcpy ((char *) new_environ, (char *) __environ, | |
| 128 size * sizeof (char *)); | |
| 129 | |
| 130 memcpy (new_environ[size], name, namelen); | |
| 131 new_environ[size][namelen] = '='; | |
| 132 memcpy (&new_environ[size][namelen + 1], value, vallen); | |
| 133 | |
| 134 new_environ[size + 1] = NULL; | |
| 135 | |
| 136 last_environ = __environ = new_environ; | |
| 137 } | |
| 138 else if (replace) | |
| 139 { | |
| 140 size_t len = strlen (*ep); | |
| 141 if (len + 1 < namelen + 1 + vallen) | |
| 142 { | |
| 143 /* The existing string is too short; malloc a new one. */ | |
| 144 char *new_string = (char *) malloc (namelen + 1 + vallen); | |
| 145 if (new_string == NULL) | |
| 146 { | |
| 147 UNLOCK; | |
| 148 return -1; | |
| 149 } | |
| 150 *ep = new_string; | |
| 151 } | |
| 152 memcpy (*ep, name, namelen); | |
| 153 (*ep)[namelen] = '='; | |
| 154 memcpy (&(*ep)[namelen + 1], value, vallen); | |
| 155 } | |
| 156 | |
| 157 UNLOCK; | |
| 158 | |
| 159 return 0; | |
| 160 } | |
| 161 | |
| 162 void | |
| 163 unsetenv (const char *name) | |
| 164 { | |
| 165 const size_t len = strlen (name); | |
| 166 char **ep; | |
| 167 | |
| 168 LOCK; | |
| 169 | |
| 170 for (ep = __environ; *ep; ++ep) | |
| 171 if (!strncmp (*ep, name, len) && (*ep)[len] == '=') | |
| 172 { | |
| 173 /* Found it. Remove this pointer by moving later ones back. */ | |
| 174 char **dp = ep; | |
| 175 do | |
| 176 dp[0] = dp[1]; | |
| 177 while (*dp++); | |
| 178 /* Continue the loop in case NAME appears again. */ | |
| 179 } | |
| 180 | |
| 181 UNLOCK; | |
| 182 } |