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#include <stdlib.h>
#include <string.h>
#include <errno.h>
int putenv(const char *string) {
size_t len;
int envc;
int remove=0;
char *tmp;
const char **ep;
char **newenv;
static char **origenv;
if (!origenv) origenv=environ;
if (!(tmp=strchr(string,'='))) {
len=strlen(string);
remove=1;
} else
len=tmp-string+1;
for (envc=0, ep=(const char**)environ; *ep; ++ep) {
if (*string == **ep && !memcmp(string,*ep,len)) {
if (remove) {
for (; ep[1]; ++ep) ep[0]=ep[1];
ep[0]=0;
return 0;
}
*ep=string;
return 0;
}
++envc;
}
if (tmp) {
newenv = (char**) realloc(environ==origenv?0:origenv,
(envc+2)*sizeof(char*));
if (!newenv) return -1;
newenv[0]=(char*)string;
memcpy(newenv+1,environ,(envc+1)*sizeof(char*));
environ=newenv;
}
return 0;
}
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