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-rw-r--r--libc/unistd/usershell.c157
1 files changed, 114 insertions, 43 deletions
diff --git a/libc/unistd/usershell.c b/libc/unistd/usershell.c
index dcd95fb6d..13351de9f 100644
--- a/libc/unistd/usershell.c
+++ b/libc/unistd/usershell.c
@@ -1,63 +1,134 @@
-/* vi: set sw=4 ts=4: */
-/* getusershell and friends for uClibc
+/*
+ * Copyright (c) 1985, 1993
+ * The Regents of the University of California. All rights reserved.
*
- * Copyright (C) 2002 by Robert Griebl <griebl@gmx.de>
+ * 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 program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Library General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
+ * 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 program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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.
+ */
-/* Rely on the .bss to zero these */
-static FILE *fp;
-static int isopen;
-static char **cursh;
-static char *validsh [] = { "/bin/sh", "/bin/csh", 0 };
+static const char * const validsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
+static char **curshell, **shells, *strings;
+static char **initshells __P((void));
-void endusershell ( void )
+/*
+ * Get a list of shells from _PATH_SHELLS, if it exists.
+ */
+char * getusershell(void)
{
- if ( fp && isopen )
- fclose ( fp );
- isopen = 0;
+ char *ret;
+
+ if (curshell == NULL)
+ curshell = initshells();
+ ret = *curshell;
+ if (ret != NULL)
+ curshell++;
+ return (ret);
}
-void setusershell ( void )
+static void __free_initshell_memory(void)
{
- if ( isopen )
- endusershell ( );
- fp = fopen ( "/etc/shells", "r" );
- cursh = validsh;
- isopen = 1;
+ if (shells != NULL) {
+ free(shells);
+ }
+ shells = NULL;
+ if (strings != NULL) {
+ free(strings);
+ }
+ strings = NULL;
}
-char *getusershell ( void )
+void endusershell(void)
{
- char line [BUFSIZ];
-
- if ( !isopen )
- setusershell ( );
+ __free_initshell_memory();
+ curshell = NULL;
+}
- if ( fp ) {
- return fgets ( line, sizeof( line ) - 1, fp );
- } else {
- char *result = *cursh;
+void setusershell(void)
+{
- if ( result )
- cursh++;
- return result;
- }
+ 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. */
+ __fsetlocking (fp, FSETLOCKING_BYCALLER);
+ 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;
+}