import newlib-2000-02-17 snapshotcvs/SNAPSHOT

1 files changed, 139 insertions, 0 deletions

diff --git a/newlib/libc/stdlib/setenv_r.c b/newlib/libc/stdlib/setenv_r.c
new file mode 100644
index 00000000000..2d3c3f4e58c
--- /dev/null
+++ b/newlib/libc/stdlib/setenv_r.c
@@ -0,0 +1,139 @@
+/* This file may have been modified by DJ Delorie (Jan 1991).  If so,
+** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave,
+** Rochester NH, 03867-2954, USA.
+*/
+
+/*
+ * Copyright (c) 1987 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that: (1) source distributions retain this entire copyright
+ * notice and comment, and (2) distributions including binaries display
+ * the following acknowledgement:  ``This product includes software
+ * developed by the University of California, Berkeley and its contributors''
+ * in the documentation or other materials provided with the distribution
+ * and in all advertising materials mentioning features or use of this
+ * software. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <reent.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include "envlock.h"
+
+/* _findenv_r is defined in getenv_r.c.  */
+extern char *_findenv_r _PARAMS ((struct _reent *, const char *, int *));
+
+/*
+ * _setenv_r --
+ *	Set the value of the environmental variable "name" to be
+ *	"value".  If rewrite is set, replace any current value.
+ */
+
+int
+_DEFUN (_setenv_r, (reent_ptr, name, value, rewrite),
+        struct _reent *reent_ptr _AND
+	_CONST char *name _AND
+	_CONST char *value _AND
+	int rewrite)
+{
+  extern char **environ;
+  static int alloced;		/* if allocated space before */
+  register char *C;
+  int l_value, offset;
+
+  ENV_LOCK;
+
+  if (*value == '=')		/* no `=' in value */
+    ++value;
+  l_value = strlen (value);
+  if ((C = _findenv_r (reent_ptr, name, &offset)))
+    {				/* find if already exists */
+      if (!rewrite)
+        {
+          ENV_UNLOCK;
+	  return 0;
+        }
+      if (strlen (C) >= l_value)
+	{			/* old larger; copy over */
+	  while (*C++ = *value++);
+          ENV_UNLOCK;
+	  return 0;
+	}
+    }
+  else
+    {				/* create new slot */
+      register int cnt;
+      register char **P;
+
+      for (P = environ, cnt = 0; *P; ++P, ++cnt);
+      if (alloced)
+	{			/* just increase size */
+	  environ = (char **) _realloc_r (reent_ptr, (char *) environ,
+				       (size_t) (sizeof (char *) * (cnt + 2)));
+	  if (!environ)
+            {
+              ENV_UNLOCK;
+	      return -1;
+            }
+	}
+      else
+	{			/* get new space */
+	  alloced = 1;		/* copy old entries into it */
+	  P = (char **) _malloc_r (reent_ptr, (size_t) (sizeof (char *) * (cnt + 2)));
+	  if (!P)
+            {
+              ENV_UNLOCK;
+	      return (-1);
+            }
+	  bcopy ((char *) environ, (char *) P, cnt * sizeof (char *));
+	  environ = P;
+	}
+      environ[cnt + 1] = NULL;
+      offset = cnt;
+    }
+  for (C = (char *) name; *C && *C != '='; ++C);	/* no `=' in name */
+  if (!(environ[offset] =	/* name + `=' + value */
+	_malloc_r (reent_ptr, (size_t) ((int) (C - name) + l_value + 2))))
+    {
+      ENV_UNLOCK;
+      return -1;
+    }
+  for (C = environ[offset]; (*C = *name++) && *C != '='; ++C);
+  for (*C++ = '='; *C++ = *value++;);
+
+  ENV_UNLOCK;
+
+  return 0;
+}
+
+/*
+ * _unsetenv_r(name) --
+ *	Delete environmental variable "name".
+ */
+void
+_DEFUN (_unsetenv_r, (reent_ptr, name),
+        struct _reent *reent_ptr _AND
+        _CONST char *name)
+{
+  extern char **environ;
+  register char **P;
+  int offset;
+
+  ENV_LOCK;
+
+  while (_findenv_r (reent_ptr, name, &offset))	/* if set multiple times */
+    for (P = &environ[offset];; ++P)
+      if (!(*P = *(P + 1)))
+	break;
+
+  ENV_UNLOCK;
+}