getenv.c

linux下用PCMCIA无线网卡虚拟无线AP的程序源码

/* Copyright (C) 1995,1996 Robert de Bath <[e-mail]>
 * This file is part of the Linux-8086 C library and is distributed
 * under the GNU Library General Public License.
 */
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <malloc.h>

char *getenv(var)
const char *var;
{
	char **p;
	int len;

	len = strlen(var);

	if (!__environ)
		return 0;

	for (p = __environ; *p; p++) {
		if (memcmp(var, *p, len) == 0 && (*p)[len] == '=')
			return *p + len + 1;
	}
	return 0;
}