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/* $OpenBSD: pw_dup.c,v 1.8 2015/09/13 15:33:48 guenther Exp $ */ |
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/* |
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* Copyright (c) 2000, 2002 Todd C. Miller <Todd.Miller@courtesan.com> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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* |
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* Sponsored in part by the Defense Advanced Research Projects |
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* Agency (DARPA) and Air Force Research Laboratory, Air Force |
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* Materiel Command, USAF, under agreement number F39502-99-1-0512. |
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*/ |
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#include <sys/types.h> |
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#include <pwd.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#define PW_SIZE(name, size) \ |
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do { \ |
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if (pw->name) { \ |
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size = strlen(pw->name) + 1; \ |
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total += size; \ |
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} \ |
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} while (0) |
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#define PW_COPY(name, size) \ |
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do { \ |
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if (pw->name) { \ |
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(void)memcpy(cp, pw->name, size); \ |
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newpw->name = cp; \ |
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cp += size; \ |
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} \ |
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} while (0) |
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struct passwd * |
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pw_dup(const struct passwd *pw) |
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{ |
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char *cp; |
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size_t nsize, psize, csize, gsize, dsize, ssize, total; |
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struct passwd *newpw; |
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/* Allocate in one big chunk for easy freeing */ |
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total = sizeof(struct passwd); |
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PW_SIZE(pw_name, nsize); |
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PW_SIZE(pw_passwd, psize); |
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PW_SIZE(pw_class, csize); |
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PW_SIZE(pw_gecos, gsize); |
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PW_SIZE(pw_dir, dsize); |
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PW_SIZE(pw_shell, ssize); |
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if ((cp = malloc(total)) == NULL) |
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return (NULL); |
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newpw = (struct passwd *)cp; |
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/* |
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* Copy in passwd contents and make strings relative to space |
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* at the end of the buffer. |
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*/ |
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(void)memcpy(newpw, pw, sizeof(struct passwd)); |
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cp += sizeof(struct passwd); |
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PW_COPY(pw_name, nsize); |
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PW_COPY(pw_passwd, psize); |
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PW_COPY(pw_class, csize); |
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PW_COPY(pw_gecos, gsize); |
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PW_COPY(pw_dir, dsize); |
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PW_COPY(pw_shell, ssize); |
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return (newpw); |
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} |
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DEF_WEAK(pw_dup); |