1 files changed, 121 insertions, 0 deletions
diff --git a/usr/src/lib/libbc/libc/gen/common/putenv.c b/usr/src/lib/libbc/libc/gen/common/putenv.c
new file mode 100644
index 0000000000..41e2a49b7c
--- /dev/null
+++ b/usr/src/lib/libbc/libc/gen/common/putenv.c
@@ -0,0 +1,121 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 1987 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*      Copyright (c) 1984 AT&T */
+/*        All Rights Reserved   */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from S5R2 1.2 */
+
+/*	LINTLIBRARY	*/
+/*	putenv - change environment variables
+
+	input - char *change = a pointer to a string of the form
+			       "name=value"
+
+	output - 0, if successful
+		 1, otherwise
+*/
+#define NULL 0
+extern char **environ;		/* pointer to enviroment */
+static reall;		/* flag to reallocate space, if putenv is called
+				   more than once */
+
+int
+putenv(change)
+char *change;
+{
+	char **newenv;		    /* points to new environment */
+	register int which;	    /* index of variable to replace */
+	char *realloc(), *malloc(); /* memory alloc routines */
+
+	if ((which = find(change)) < 0)  {
+		/* if a new variable */
+		/* which is negative of table size, so invert and
+		   count new element */
+		which = (-which) + 1;
+		if (reall)  {
+			/* we have expanded environ before */
+			newenv = (char **)realloc(environ,
+				  which*sizeof(char *));
+			if (newenv == NULL)  return -1;
+			/* now that we have space, change environ */
+			environ = newenv;
+		} else {
+			/* environ points to the original space */
+			reall++;
+			newenv = (char **)malloc(which*sizeof(char *));
+			if (newenv == NULL)  return -1;
+			(void)memcpy((char *)newenv, (char *)environ,
+ 				(int)(which*sizeof(char *)));
+			environ = newenv;
+		}
+		environ[which-2] = change;
+		environ[which-1] = NULL;
+	}  else  {
+		/* we are replacing an old variable */
+		environ[which] = change;
+	}
+	return 0;
+}
+
+/*	find - find where s2 is in environ
+ *
+ *	input - str = string of form name=value
+ *
+ *	output - index of name in environ that matches "name"
+ *		 -size of table, if none exists
+*/
+static
+find(str)
+register char *str;
+{
+	register int ct = 0;	/* index into environ */
+
+	while(environ[ct] != NULL)   {
+		if (match(environ[ct], str)  != 0)
+			return ct;
+		ct++;
+	}
+	return -(++ct);
+}
+/*
+ *	s1 is either name, or name=value
+ *	s2 is name=value
+ *	if names match, return value of 1,
+ *	else return 0
+ */
+
+static
+match(s1, s2)
+register char *s1, *s2;
+{
+	while(*s1 == *s2++)  {
+		if (*s1 == '=')
+			return 1;
+		s1++;
+	}
+	return 0;
+}