setenv(SubstrateSafeMode_, "1", true);

char *dil(getenv(SubstrateVariable_));

if (dil == NULL) {

MSLog(MSLogLevelError, "MS:Error: %s is unset?", SubstrateVariable_);

return;

}

size_t length(strlen(dil));

char buffer[length + 3];

buffer[0] = ':';

memcpy(buffer + 1, dil, length);

buffer[length + 1] = ':';

buffer[length + 2] = '\0';

char *index(strstr(buffer, ":" SubstrateLibrary_ ":"));

if (index == NULL) {

MSLog(MSLogLevelError, "MS:Error: dylib not in %s", SubstrateVariable_);

return;

}

size_t skip(sizeof(SubstrateLibrary_));

if (length == skip - 1) {

unsetenv(SubstrateVariable_);

return;

}

buffer[length + 1] = '\0';

memmove(index + 1, index + 1 + skip, length - (index - buffer) - skip + 2);

setenv(SubstrateVariable_, buffer + 1, true);