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/*
* putenv.c -- (un)set an envariable
*
* $Id: putenv.c,v 1.1.1.1 1999/04/30 18:08:34 doug Exp $
*/
#include <h/mh.h>
extern char **environ;
/*
* prototypes
*/
int m_putenv (char *, char *);
int unputenv (char *);
static int nvmatch (char *, char *);
int
m_putenv (char *name, char *value)
{
register int i;
register char **ep, **nep, *cp;
if (!(cp = malloc ((size_t) (strlen (name) + strlen (value) + 2))))
return 1;
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 ((size_t) ((i + 2) * sizeof(*nep)))))
return 1;
for (ep = environ, i = 0; *ep; nep[i++] = *ep++)
continue;
nep[i++] = cp;
nep[i] = NULL;
environ = nep;
return 0;
}
int
unputenv (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 int
nvmatch (char *s1, char *s2)
{
while (*s1 == *s2++)
if (*s1++ == '=')
return 1;
return (*s1 == '\0' && *--s2 == '=');
}
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