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+/****************************************************************/
+/*								*/
+/*	putenv(3)						*/
+/*								*/
+/*		Change or add an environment entry		*/
+/*								*/
+/****************************************************************/
+/*   origination        1987-Oct-7               T. Holm	*/
+/****************************************************************/
+
+/*
+From pacbell!ames!ll-xn!mit-eddie!uw-beaver!ssc-vax!uvicctr!tholm Wed May  4 23:40:52 1988
+Path: hoptoad!pacbell!ames!ll-xn!mit-eddie!uw-beaver!ssc-vax!uvicctr!tholm
+From: tholm@uvicctr.UUCP (Terrence W. Holm)
+Newsgroups: comp.os.minix
+Subject: putenv(3)
+Message-ID: <395@uvicctr.UUCP>
+Date: 5 May 88 06:40:52 GMT
+Reply-To: tholm@uvicctr.UUCP (Terrence W. Holm)
+Organization: University of Victoria, Victoria B.C. Canada
+Lines: 296
+
+
+EFTH Minix report #2  - May 1988 -  putenv(3)
+
+
+This is an implementation of putenv(3) that we
+wrote for Minix. Please consider this a public
+domain program.
+*/
+
+#include <stdio.h>
+
+
+#define  PSIZE  sizeof(char *)
+
+
+extern  char  **environ;
+
+
+char  *index();
+char  *malloc();
+
+
+/****************************************************************/
+/*								*/
+/*	putenv( entry )						*/
+/*								*/
+/*		The "entry" should follow the form 		*/
+/*		"NAME=VALUE". This routine will search the 	*/
+/*		user environment for "NAME" and replace its 	*/
+/*		value with "VALUE".				*/
+/*								*/
+/*		Note that "entry" is not copied, it is used 	*/
+/*		as the environment entry. This means that it 	*/
+/*		must not be unallocated or otherwise modifed 	*/
+/*		by the caller, unless it is replaced by a 	*/
+/*		subsequent putenv().				*/
+/*								*/
+/*		If the name is not found in the environment, 	*/
+/*		then a new vector of pointers is allocated, 	*/
+/*		"entry" is put at the end and the global 	*/
+/*		variable "environ" is updated.			*/
+/*								*/
+/*		This function normally returns NULL, but -1	*/
+/*		is returned if it can not allocate enough 	*/
+/*		space using malloc(3), or "entry" does not	*/
+/*		contain a '='.					*/
+/*								*/
+/****************************************************************/
+
+
+putenv( entry )
+  char *entry;
+
+  {
+  unsigned length;
+  unsigned size;
+  char     **p;
+  char     **new_environ;
+
+  /*  Find the length of the "NAME="  */
+
+  if ( (length=(unsigned) index(entry,'=')) == NULL )
+    return( -1 );
+
+  length = length - (unsigned) entry + 1;
+
+
+  /*  Scan through the environment looking for "NAME="  */
+
+  for ( p=environ; *p != 0 ; p++ )
+    if ( strncmp( entry, *p, length ) == 0 )
+      {
+      *p = entry;
+      return( NULL );
+      }
+
+
+  /*  The name was not found, build a bigger environment  */
+
+  size = p - environ;
+
+  new_environ = (char **) malloc( (size+2)*PSIZE );
+
+  if ( new_environ == NULL )
+    return( -1 );
+
+  bcopy( (char *) environ, (char *) new_environ, size*PSIZE );
+
+  new_environ[size]   = entry;
+  new_environ[size+1] = NULL;
+
+  environ = new_environ;
+
+  return(NULL);
+  }