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f1985efa52
Make strings buffer one bigger as fgets always succeeds when second argument is 1. Don't use calloc for shells array. Disallow / as shell.
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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/*
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* Local shells should NOT be added here. They should be added in
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* /etc/shells.
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*/
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/* NB: we do not initialize okshells here. The initialization needs
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relocations. These interfaces are used so rarely that this is not
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justified. Instead explicitly initialize the array when it is
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used. */
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#if 0
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static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
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#else
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static const char *okshells[3];
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#endif
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static char **curshell, **shells, *strings;
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static char **initshells (void) __THROW;
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/*
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* Get a list of shells from _PATH_SHELLS, if it exists.
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*/
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char *
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getusershell()
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{
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char *ret;
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if (curshell == NULL)
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curshell = initshells();
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ret = *curshell;
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if (ret != NULL)
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curshell++;
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return (ret);
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}
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void
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endusershell()
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{
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free(shells);
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shells = NULL;
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free(strings);
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strings = NULL;
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curshell = NULL;
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}
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void
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setusershell()
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{
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curshell = initshells();
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}
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static char **
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initshells()
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{
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register char **sp, *cp;
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register FILE *fp;
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struct stat64 statb;
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size_t flen;
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free(shells);
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shells = NULL;
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free(strings);
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strings = NULL;
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if ((fp = fopen(_PATH_SHELLS, "rc")) == NULL)
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goto init_okshells_noclose;
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if (fstat64(fileno(fp), &statb) == -1) {
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init_okshells:
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(void)fclose(fp);
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init_okshells_noclose:
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okshells[0] = _PATH_BSHELL;
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okshells[1] = _PATH_CSHELL;
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return (char **) okshells;
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}
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if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3)
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goto init_okshells;
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if ((strings = malloc(statb.st_size + 2)) == NULL)
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goto init_okshells;
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shells = malloc(statb.st_size / 3 * sizeof (char *));
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if (shells == NULL) {
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free(strings);
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strings = NULL;
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goto init_okshells;
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}
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sp = shells;
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cp = strings;
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flen = statb.st_size + 2;
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while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
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while (*cp != '#' && *cp != '/' && *cp != '\0')
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cp++;
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if (*cp == '#' || *cp == '\0' || cp[1] == '\0')
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continue;
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*sp++ = cp;
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while (!isspace(*cp) && *cp != '#' && *cp != '\0')
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cp++;
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*cp++ = '\0';
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}
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*sp = NULL;
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(void)fclose(fp);
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return (shells);
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}
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