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authorIan Lance Taylor <ian@airs.com>2000-02-22 15:59:20 +0000
committerIan Lance Taylor <ian@airs.com>2000-02-22 15:59:20 +0000
commite2eaf477991014a67bc122c3225f6a3fe6d1a8e6 (patch)
tree5937dcfd1baa6d55a635fde513e946dc33a05ca3 /libiberty/setenv.c
parent252b5132c753830d5fd56823373aed85f2a0db63 (diff)
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import libiberty from egcs
Diffstat (limited to 'libiberty/setenv.c')
-rw-r--r--libiberty/setenv.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/libiberty/setenv.c b/libiberty/setenv.c
new file mode 100644
index 0000000..eec1300
--- /dev/null
+++ b/libiberty/setenv.c
@@ -0,0 +1,163 @@
+/* Copyright (C) 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
+ This file based on setenv.c in the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "ansidecl.h"
+#include <sys/types.h> /* For `size_t' */
+#include <stdio.h> /* For `NULL' */
+
+#include <errno.h>
+#if !defined(errno) && !defined(HAVE_ERRNO_DECL)
+extern int errno;
+#endif
+#define __set_errno(ev) ((errno) = (ev))
+
+#if HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#if HAVE_STRING_H
+# include <string.h>
+#endif
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#define __environ environ
+#ifndef HAVE_ENVIRON_DECL
+extern char **environ;
+#endif
+
+/* LOCK and UNLOCK are defined as no-ops. This makes the libiberty
+ * implementation MT-Unsafe. */
+#define LOCK
+#define UNLOCK
+
+/* Below this point, it's verbatim code from the glibc-2.0 implementation */
+
+/* If this variable is not a null pointer we allocated the current
+ environment. */
+static char **last_environ;
+
+
+int
+setenv (name, value, replace)
+ const char *name;
+ const char *value;
+ int replace;
+{
+ register char **ep;
+ register size_t size;
+ const size_t namelen = strlen (name);
+ const size_t vallen = strlen (value) + 1;
+
+ LOCK;
+
+ size = 0;
+ if (__environ != NULL)
+ for (ep = __environ; *ep != NULL; ++ep)
+ if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
+ break;
+ else
+ ++size;
+
+ if (__environ == NULL || *ep == NULL)
+ {
+ char **new_environ;
+ if (__environ == last_environ && __environ != NULL)
+ /* We allocated this space; we can extend it. */
+ new_environ = (char **) realloc (last_environ,
+ (size + 2) * sizeof (char *));
+ else
+ new_environ = (char **) malloc ((size + 2) * sizeof (char *));
+
+ if (new_environ == NULL)
+ {
+ UNLOCK;
+ return -1;
+ }
+
+ new_environ[size] = malloc (namelen + 1 + vallen);
+ if (new_environ[size] == NULL)
+ {
+ free ((char *) new_environ);
+ __set_errno (ENOMEM);
+ UNLOCK;
+ return -1;
+ }
+
+ if (__environ != last_environ)
+ memcpy ((char *) new_environ, (char *) __environ,
+ size * sizeof (char *));
+
+ memcpy (new_environ[size], name, namelen);
+ new_environ[size][namelen] = '=';
+ memcpy (&new_environ[size][namelen + 1], value, vallen);
+
+ new_environ[size + 1] = NULL;
+
+ last_environ = __environ = new_environ;
+ }
+ else if (replace)
+ {
+ size_t len = strlen (*ep);
+ if (len + 1 < namelen + 1 + vallen)
+ {
+ /* The existing string is too short; malloc a new one. */
+ char *new = malloc (namelen + 1 + vallen);
+ if (new == NULL)
+ {
+ UNLOCK;
+ return -1;
+ }
+ *ep = new;
+ }
+ memcpy (*ep, name, namelen);
+ (*ep)[namelen] = '=';
+ memcpy (&(*ep)[namelen + 1], value, vallen);
+ }
+
+ UNLOCK;
+
+ return 0;
+}
+
+void
+unsetenv (name)
+ const char *name;
+{
+ const size_t len = strlen (name);
+ char **ep;
+
+ LOCK;
+
+ for (ep = __environ; *ep; ++ep)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+
+ UNLOCK;
+}