Mercurial > hg > CbC > CbC_gcc
annotate libiberty/setenv.c @ 90:99e7b6776dd1
implemeted __rectype expression. add CbC-exanples/fact-rectype.s
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Sun, 25 Dec 2011 04:04:42 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
|
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
|
1 /* Copyright (C) 1992, 1995, 1996, 1997, 2002, 2011 Free Software Foundation, |
|
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
|
2 Inc. |
| 0 | 3 This file based on setenv.c in the GNU C Library. |
| 4 | |
| 5 The GNU C Library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public License as | |
| 7 published by the Free Software Foundation; either version 2 of the | |
| 8 License, or (at your option) any later version. | |
| 9 | |
| 10 The GNU C Library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, | |
| 18 Boston, MA 02110-1301, USA. */ | |
| 19 | |
| 20 | |
| 21 /* | |
| 22 | |
|
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
|
23 @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
|
24 const char *@var{value}, int @var{overwrite}) |
| 0 | 25 @deftypefnx Supplemental void unsetenv (const char *@var{name}) |
| 26 | |
| 27 @code{setenv} adds @var{name} to the environment with value | |
| 28 @var{value}. If the name was already present in the environment, | |
| 29 the new value will be stored only if @var{overwrite} is nonzero. | |
| 30 The companion @code{unsetenv} function removes @var{name} from the | |
| 31 environment. This implementation is not safe for multithreaded code. | |
| 32 | |
| 33 @end deftypefn | |
| 34 | |
| 35 */ | |
| 36 | |
| 37 #if HAVE_CONFIG_H | |
| 38 # include <config.h> | |
| 39 #endif | |
| 40 | |
| 41 #define setenv libiberty_setenv | |
| 42 #define unsetenv libiberty_unsetenv | |
| 43 | |
| 44 #include "ansidecl.h" | |
| 45 #include <sys/types.h> /* For `size_t' */ | |
| 46 #include <stdio.h> /* For `NULL' */ | |
| 47 | |
| 48 #include <errno.h> | |
| 49 #if !defined(errno) && !defined(HAVE_ERRNO_DECL) | |
| 50 extern int errno; | |
| 51 #endif | |
| 52 #define __set_errno(ev) ((errno) = (ev)) | |
| 53 | |
| 54 #if HAVE_STDLIB_H | |
| 55 # include <stdlib.h> | |
| 56 #endif | |
| 57 #if HAVE_STRING_H | |
| 58 # include <string.h> | |
| 59 #endif | |
| 60 #if HAVE_UNISTD_H | |
| 61 # include <unistd.h> | |
| 62 #endif | |
| 63 | |
| 64 #define __environ environ | |
| 65 #ifndef HAVE_ENVIRON_DECL | |
| 66 extern char **environ; | |
| 67 #endif | |
| 68 | |
| 69 #undef setenv | |
| 70 #undef unsetenv | |
| 71 | |
| 72 /* LOCK and UNLOCK are defined as no-ops. This makes the libiberty | |
| 73 * implementation MT-Unsafe. */ | |
| 74 #define LOCK | |
| 75 #define UNLOCK | |
| 76 | |
| 77 /* Below this point, it's verbatim code from the glibc-2.0 implementation */ | |
| 78 | |
| 79 /* If this variable is not a null pointer we allocated the current | |
| 80 environment. */ | |
| 81 static char **last_environ; | |
| 82 | |
| 83 | |
| 84 int | |
| 85 setenv (const char *name, const char *value, int replace) | |
| 86 { | |
| 87 register char **ep = 0; | |
| 88 register size_t size; | |
| 89 const size_t namelen = strlen (name); | |
| 90 const size_t vallen = strlen (value) + 1; | |
| 91 | |
| 92 LOCK; | |
| 93 | |
| 94 size = 0; | |
| 95 if (__environ != NULL) | |
| 96 { | |
| 97 for (ep = __environ; *ep != NULL; ++ep) | |
| 98 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=') | |
| 99 break; | |
| 100 else | |
| 101 ++size; | |
| 102 } | |
| 103 | |
| 104 if (__environ == NULL || *ep == NULL) | |
| 105 { | |
| 106 char **new_environ; | |
| 107 if (__environ == last_environ && __environ != NULL) | |
| 108 /* We allocated this space; we can extend it. */ | |
| 109 new_environ = (char **) realloc (last_environ, | |
| 110 (size + 2) * sizeof (char *)); | |
| 111 else | |
| 112 new_environ = (char **) malloc ((size + 2) * sizeof (char *)); | |
| 113 | |
| 114 if (new_environ == NULL) | |
| 115 { | |
| 116 UNLOCK; | |
| 117 return -1; | |
| 118 } | |
| 119 | |
| 120 new_environ[size] = (char *) malloc (namelen + 1 + vallen); | |
| 121 if (new_environ[size] == NULL) | |
| 122 { | |
| 123 free ((char *) new_environ); | |
| 124 __set_errno (ENOMEM); | |
| 125 UNLOCK; | |
| 126 return -1; | |
| 127 } | |
| 128 | |
| 129 if (__environ != last_environ) | |
| 130 memcpy ((char *) new_environ, (char *) __environ, | |
| 131 size * sizeof (char *)); | |
| 132 | |
| 133 memcpy (new_environ[size], name, namelen); | |
| 134 new_environ[size][namelen] = '='; | |
| 135 memcpy (&new_environ[size][namelen + 1], value, vallen); | |
| 136 | |
| 137 new_environ[size + 1] = NULL; | |
| 138 | |
| 139 last_environ = __environ = new_environ; | |
| 140 } | |
| 141 else if (replace) | |
| 142 { | |
| 143 size_t len = strlen (*ep); | |
| 144 if (len + 1 < namelen + 1 + vallen) | |
| 145 { | |
| 146 /* The existing string is too short; malloc a new one. */ | |
| 147 char *new_string = (char *) malloc (namelen + 1 + vallen); | |
| 148 if (new_string == NULL) | |
| 149 { | |
| 150 UNLOCK; | |
| 151 return -1; | |
| 152 } | |
| 153 *ep = new_string; | |
| 154 } | |
| 155 memcpy (*ep, name, namelen); | |
| 156 (*ep)[namelen] = '='; | |
| 157 memcpy (&(*ep)[namelen + 1], value, vallen); | |
| 158 } | |
| 159 | |
| 160 UNLOCK; | |
| 161 | |
| 162 return 0; | |
| 163 } | |
| 164 | |
| 165 void | |
| 166 unsetenv (const char *name) | |
| 167 { | |
| 168 const size_t len = strlen (name); | |
| 169 char **ep; | |
| 170 | |
| 171 LOCK; | |
| 172 | |
| 173 for (ep = __environ; *ep; ++ep) | |
| 174 if (!strncmp (*ep, name, len) && (*ep)[len] == '=') | |
| 175 { | |
| 176 /* Found it. Remove this pointer by moving later ones back. */ | |
| 177 char **dp = ep; | |
| 178 do | |
| 179 dp[0] = dp[1]; | |
| 180 while (*dp++); | |
| 181 /* Continue the loop in case NAME appears again. */ | |
| 182 } | |
| 183 | |
| 184 UNLOCK; | |
| 185 } |