strdup.c

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#include <sys/types.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

char *strdup(const char *s)
{
        char *ret;

        ret = malloc(strlen(s) + 1);
        if (!ret) {
                return NULL;
        }

        strcpy(ret, s);
        return ret;
}

char *strndup(const char *s, size_t n)
{
        char *ret;
        int len;

        len = strlen(s);
        len = len < n ? len : n;

        ret = malloc(len + 1);
        if (!ret) {
                return NULL;
        }

        strncpy(ret, (char*)s, n);
        ret[n] = '\0';
        return ret;
}

char *strdupa(const char *s)
{
        return NULL;
}

char *strndupa(const char *s, size_t n)
{
        return NULL;
}

/* End of a file */