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#include <stdlib.h>
#include <string.h>
int putenv(char *string)
{
const char *const name_end = strchr(string, '=');
if (name_end) {
char name[name_end - string + 1];
memcpy(name, string, name_end - string);
name[name_end - string] = '\0';
return setenv(name, name_end + 1, 1);
}
unsetenv(string);
return 0;
}
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