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/* $OpenBSD: pw_dup.c,v 1.9 2019/01/25 00:19:25 millert Exp $ */
/*
* Copyright (c) 2000, 2002 Todd C. Miller <millert@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <sys/types.h>
#include <pwd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define PW_SIZE(name, size) \
do { \
if (pw->name) { \
size = strlen(pw->name) + 1; \
total += size; \
} \
} while (0)
#define PW_COPY(name, size) \
do { \
if (pw->name) { \
(void)memcpy(cp, pw->name, size); \
newpw->name = cp; \
cp += size; \
} \
} while (0)
struct passwd *
pw_dup(const struct passwd *pw)
{
char *cp;
size_t nsize, psize, csize, gsize, dsize, ssize, total;
struct passwd *newpw;
/* Allocate in one big chunk for easy freeing */
total = sizeof(struct passwd);
PW_SIZE(pw_name, nsize);
PW_SIZE(pw_passwd, psize);
PW_SIZE(pw_class, csize);
PW_SIZE(pw_gecos, gsize);
PW_SIZE(pw_dir, dsize);
PW_SIZE(pw_shell, ssize);
if ((cp = malloc(total)) == NULL)
return (NULL);
newpw = (struct passwd *)cp;
/*
* Copy in passwd contents and make strings relative to space
* at the end of the buffer.
*/
(void)memcpy(newpw, pw, sizeof(struct passwd));
cp += sizeof(struct passwd);
PW_COPY(pw_name, nsize);
PW_COPY(pw_passwd, psize);
PW_COPY(pw_class, csize);
PW_COPY(pw_gecos, gsize);
PW_COPY(pw_dir, dsize);
PW_COPY(pw_shell, ssize);
return (newpw);
}
DEF_WEAK(pw_dup);
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