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/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
* 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 <malloc.h>
extern char ** environ;
#define ADD_NUM 4
int
setenv(var, value, overwrite)
const char * var;
const char * value;
int overwrite;
{
static char ** mall_env = 0;
static int extras = 0;
char **p, **d;
char * t;
int len;
len = strlen(var);
if (!environ) {
environ = (char**)malloc(ADD_NUM * sizeof(char*));
memset(environ, 0, sizeof(char*)*ADD_NUM);
extras = ADD_NUM;
}
for(p=environ; *p; p++)
{
if( memcmp(var, *p, len) == 0 && (*p)[len] == '=' )
{
if (!overwrite)
return -1;
/* Overwrite stuff */
while( (p[0] = p[1]) ) p++;
extras++;
break;
}
}
if( extras <= 0 ) /* Need more space */
{
d = malloc((p-environ+1+ADD_NUM)*sizeof(char*));
if( d == 0 ) return -1;
memcpy((void*) d, (void*) environ, (p-environ+1)*sizeof(char*));
p = d + (p-environ);
extras=ADD_NUM;
if( mall_env ) free(mall_env);
environ = d;
mall_env = d;
}
t = malloc(len + 1 + strlen(value) + 1);
if (!t)
return -1;
strcpy(t, var);
strcat(t, "=");
strcat(t, value);
*p++ = (char*)t;
*p = '\0';
extras--;
return 0;
}
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