head	1.6;
access;
symbols;
locks; strict;
comment	@ * @;


1.6
date	92.12.15.00.20.22;	author jromine;	state Exp;
branches;
next	1.5;

1.5
date	92.11.04.00.37.05;	author jromine;	state Exp;
branches;
next	1.4;

1.4
date	90.04.05.15.32.08;	author sources;	state Exp;
branches;
next	1.3;

1.3
date	90.04.05.14.49.34;	author sources;	state Exp;
branches;
next	1.2;

1.2
date	90.02.06.13.08.41;	author sources;	state Exp;
branches;
next	1.1;

1.1
date	90.02.06.13.06.05;	author sources;	state Exp;
branches;
next	;


desc
@
@


1.6
log
@endif sugar
@
text
@/* putenv.c - (un) set an envariable */
#ifndef	lint
static char ident[] = "@@(#)$Id: putenv.c,v 1.5 1992/11/04 00:37:05 jromine Exp jromine $";
#endif	/* lint */

#include "../h/mh.h"
#include <stdio.h>


extern  char **environ;

static nvmatch();

int     m_putenv (name, value)
register char  *name,
               *value;
{
    register int    i;
    register char **ep,
                  **nep,
                   *cp;

    if ((cp = malloc ((unsigned) (strlen (name) + strlen (value) + 2)))
	    == NULL)
	return 1;
    (void) sprintf (cp, "%s=%s", name, value);

    for (ep = environ, i = 0; *ep; ep++, i++)
	if (nvmatch (name, *ep)) {
	    *ep = cp;
	    return 0;
	}

    if ((nep = (char **) malloc ((unsigned) ((i + 2) * sizeof *nep))) == NULL)
	return 1;
    for (ep = environ, i = 0; *ep; nep[i++] = *ep++)
	continue;
    nep[i++] = cp;
    nep[i] = NULL;
    environ = nep;
    return 0;
}


int	unputenv (name)
char   *name;
{
    char  **ep,
          **nep;

    for (ep = environ; *ep; ep++)
	if (nvmatch (name, *ep))
	    break;
    if (*ep == NULL)
	return 1;

    for (nep = ep + 1; *nep; nep++)
	continue;
    *ep = *--nep;
    *nep = NULL;
    return 0;
}

/*  */

static nvmatch (s1, s2)
register char  *s1,
               *s2;
{
    while (*s1 == *s2++)
	if (*s1++ == '=')
	    return 1;

    return (*s1 == '\0' && *--s2 == '=');
}
@


1.5
log
@putenv -> m_putenv
@
text
@d3 2
a4 2
static char ident[] = "@@(#)$Id: putenv.c,v 1.4 1990/04/05 15:32:08 sources Exp jromine $";
#endif	lint
@


1.4
log
@add ID
@
text
@d3 1
a3 1
static char ident[] = "@@(#)$Id:$";
d14 1
a14 1
int     putenv (name, value)
@


1.3
log
@add ID
@
text
@d3 1
a3 1
static char ident[] = "$Id:";
@


1.2
log
@ANSI Compilance
@
text
@d2 3
@


1.1
log
@Initial revision
@
text
@d9 1
@