DataMuseum.dk

Presents historical artifacts from the history of:

DKUUG/EUUG Conference tapes

This is an automatic "excavation" of a thematic subset of
artifacts from Datamuseum.dk's BitArchive.

See our Wiki for more about DKUUG/EUUG Conference tapes

Excavated with: AutoArchaeologist - Free & Open Source Software. 

top - metrics - download
Index: T p

⟦2073f668f⟧ TextFile

    Length: 1235 (0x4d3)
    Types: TextFile
    Names: »putenv.c«

Derivation

└─⟦9ae75bfbd⟧ Bits:30007242 EUUGD3: Starter Kit
    └─⟦3658e588a⟧ »EurOpenD3/mail/mh/mh-6.7.tar.Z« 
        └─⟦c75e36ecb⟧ 
            └─⟦this⟧ »mh-6.7/sbr/putenv.c«

TextFile

/* putenv.c - (un) set an envariable */

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


extern  char **environ;

static nvmatch();

int     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;
}

/* \f

 */

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

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