import newlib-2000-02-17 snapshot

1 files changed, 129 insertions, 0 deletions

diff --git a/newlib/libc/stdlib/getenv_r.c b/newlib/libc/stdlib/getenv_r.c
new file mode 100644
index 000000000..2ccb89a17
--- /dev/null
+++ b/newlib/libc/stdlib/getenv_r.c
@@ -0,0 +1,129 @@
+/*
+FUNCTION
+<<_getenv_r>>---look up environment variable
+
+INDEX
+	_getenv_r
+INDEX
+	environ
+
+ANSI_SYNOPSIS
+	#include <stdlib.h>
+	char *_getenv_r(struct _reent *<[reent_ptr]>, const char *<[name]>);
+
+TRAD_SYNOPSIS
+	#include <stdlib.h>
+	char *_getenv_r(<[reent_ptr]>, <[name]>)
+	struct _reent *<[reent_ptr]>;
+	char *<[name]>;
+
+DESCRIPTION
+<<_getenv_r>> searches the list of environment variable names and values
+(using the global pointer `<<char **environ>>') for a variable whose
+name matches the string at <[name]>.  If a variable name matches,
+<<_getenv_r>> returns a pointer to the associated value.
+
+RETURNS
+A pointer to the (string) value of the environment variable, or
+<<NULL>> if there is no such environment variable.
+
+PORTABILITY
+<<_getenv_r>> is not ANSI; the rules for properly forming names of environment
+variables vary from one system to another.
+
+<<_getenv_r>> requires a global pointer <<environ>>.
+*/
+
+/* 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 <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include "envlock.h"
+
+extern char **environ;
+
+/*
+ * _findenv --
+ *	Returns pointer to value associated with name, if any, else NULL.
+ *	Sets offset to be the offset of the name/value combination in the
+ *	environmental array, for use by setenv(3) and unsetenv(3).
+ *	Explicitly removes '=' in argument name.
+ *
+ *	This routine *should* be a static; don't use it.
+ */
+
+char *
+_DEFUN (_findenv_r, (reent_ptr, name, offset),
+        struct _reent *reent_ptr   _AND
+	register _CONST char *name _AND
+	int *offset)
+{
+  register int len;
+  register char **p;
+  _CONST char *c;
+
+  ENV_LOCK;
+
+  /* In some embedded systems, this does not get set.  This protects
+     newlib from dereferencing a bad pointer.  */
+  if (!environ)
+    return NULL;
+
+  c = name;
+  len = 0;
+  while (*c && *c != '=')
+    {
+      c++;
+      len++;
+    }
+
+  for (p = environ; *p; ++p)
+    if (!strncmp (*p, name, len))
+      if (*(c = *p + len) == '=')
+	{
+	  *offset = p - environ;
+          ENV_UNLOCK;
+	  return (char *) (++c);
+	}
+  ENV_UNLOCK;
+  return NULL;
+}
+
+/*
+ * _getenv_r --
+ *	Returns ptr to value associated with name, if any, else NULL.
+ */
+
+char *
+_DEFUN (_getenv_r, (reent_ptr, name),
+        struct _reent *reent_ptr _AND
+	_CONST char *name)
+{
+  int offset;
+  char *_findenv_r ();
+
+  return _findenv_r (reent_ptr, name, &offset);
+}