strdup.c\string\src - musl - musl - an implementation of the standard library for Linux-based systems

#include <stdlib.h>
#include <string.h>
char *strdup(const char *s)
{
	size_t l = strlen(s);
	char *d = malloc(l+1);
	if (!d) return NULL;
	return memcpy(d, s, l+1);
}