Libc-262.tar.gz

[apple/libc.git] / gen / getusershell.c

diff --git a/gen/getusershell.c b/gen/getusershell.c
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+++ b/gen/getusershell.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 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.
+ */
+
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <stdio.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 char *okshells[] = { _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()
+{
+       char *ret;
+
+       if (curshell == NULL)
+               curshell = initshells();
+       ret = *curshell;
+       if (ret != NULL)
+               curshell++;
+       return (ret);
+}
+
+void
+endusershell()
+{
+       
+       if (shells != NULL)
+               free(shells);
+       shells = NULL;
+       if (strings != NULL)
+               free(strings);
+       strings = NULL;
+       curshell = NULL;
+}
+
+void
+setusershell()
+{
+
+       curshell = initshells();
+}
+
+static char **
+initshells()
+{
+       register char **sp, *cp;
+       register FILE *fp;
+       struct stat statb;
+
+       if (shells != NULL)
+               free(shells);
+       shells = NULL;
+       if (strings != NULL)
+               free(strings);
+       strings = NULL;
+       if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
+               return (okshells);
+       if (fstat(fileno(fp), &statb) == -1) {
+               (void)fclose(fp);
+               return (okshells);
+       }
+       if ((strings = malloc((u_int)statb.st_size)) == NULL) {
+               (void)fclose(fp);
+               return (okshells);
+       }
+       shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
+       if (shells == NULL) {
+               (void)fclose(fp);
+               free(strings);
+               strings = NULL;
+               return (okshells);
+       }
+       sp = shells;
+       cp = strings;
+       while (fgets(cp, MAXPATHLEN + 1, 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;
+       (void)fclose(fp);
+       return (shells);
+}