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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [unistd/] [usershell.c] - Rev 1771
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/* * Copyright (c) 1985, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This version has been hevily modified for use with uClibc * November 2002, Erik Andersen <andersen@codepoet.org> */ #include <sys/param.h> #include <sys/file.h> #include <sys/stat.h> #include <stdio.h> #include <stdio_ext.h> #include <ctype.h> #include <stdlib.h> #include <unistd.h> #include <paths.h> /* * Local shells should NOT be added here. They should be added in * /etc/shells. */ static const char * const validsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; static char **curshell, **shells, *strings; static char **initshells __P((void)); /* * Get a list of shells from _PATH_SHELLS, if it exists. */ char * getusershell(void) { char *ret; if (curshell == NULL) curshell = initshells(); ret = *curshell; if (ret != NULL) curshell++; return (ret); } static void __free_initshell_memory(void) { if (shells != NULL) { free(shells); } shells = NULL; if (strings != NULL) { free(strings); } strings = NULL; } void endusershell(void) { __free_initshell_memory(); curshell = NULL; } void setusershell(void) { curshell = initshells(); } static char ** initshells(void) { register char **sp, *cp; register FILE *fp; struct stat statb; int flen; __free_initshell_memory(); if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) return (char **) validsh; if (fstat(fileno(fp), &statb) == -1) { goto cleanup; } if ((strings = malloc((unsigned)statb.st_size + 1)) == NULL) { goto cleanup; } if ((shells = calloc((unsigned)statb.st_size / 3, sizeof (char *))) == NULL) { goto cleanup; } /* No threads using this stream. */ #ifdef __UCLIBC_HAS_THREADS__ __fsetlocking (fp, FSETLOCKING_BYCALLER); #endif sp = shells; cp = strings; flen = statb.st_size; while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) { while (*cp != '#' && *cp != '/' && *cp != '\0') cp++; if (*cp == '#' || *cp == '\0') continue; *sp++ = cp; while (!isspace(*cp) && *cp != '#' && *cp != '\0') cp++; *cp++ = '\0'; } *sp = NULL; fclose(fp); return (shells); cleanup: __free_initshell_memory(); fclose(fp); return (char **) validsh; }
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