ref: c8afd04d4c9e32b9e234e33e80b4a365cd408919
dir: /sys/src/cmd/python/Python/strdup.c/
/* strdup() replacement (from stdwin, if you must know) */
#include "pgenheaders.h"
char *
strdup(const char *str)
{
	if (str != NULL) {
		register char *copy = malloc(strlen(str) + 1);
		if (copy != NULL)
			return strcpy(copy, str);
	}
	return NULL;
}