108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
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* Copyright (c) 2000, 2002, 2012 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 <config.h>
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#ifndef HAVE_PW_DUP
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#include <sys/types.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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# include <malloc.h>
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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#include <pwd.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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size_t nsize = 0, psize = 0, gsize = 0, dsize = 0, ssize = 0, total;
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#ifdef HAVE_LOGIN_CAP_H
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size_t csize;
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#endif
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struct passwd *newpw;
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char *cp;
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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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#ifdef HAVE_LOGIN_CAP_H
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PW_SIZE(pw_class, csize);
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#endif
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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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#ifdef HAVE_LOGIN_CAP_H
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PW_COPY(pw_class, csize);
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#endif
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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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#endif /* HAVE_PW_DUP */
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