?? getenv.c
字號:
/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/* $Header: getenv.c,v 1.4 91/04/24 12:18:03 ceriel Exp $ */
#include <stdlib.h>
extern const char ***_penviron;
char *
getenv(const char *name)
{
register const char **v = *_penviron;
register const char *p, *q;
if (v == NULL || name == NULL)
return (char *)NULL;
while ((p = *v++) != NULL) {
q = name;
while (*q && (*q == *p++))
q++;
if (*q || (*p != '='))
continue;
return (char *)p + 1;
}
return (char *)NULL;
}
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