- (djm) Add getusershell() functions from OpenBSD CVS

1 files changed, 138 insertions, 0 deletions

diff --git a/openbsd-compat/getusershell.c b/openbsd-compat/getusershell.c
new file mode 100644
index 000000000..b334ba2e7
--- /dev/null
+++ b/openbsd-compat/getusershell.c
@@ -0,0 +1,138 @@
+/*
+ * 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 "includes.h"
+#include "getusershell.h"
+
+#ifndef HAVE_GETUSERSHELL
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$OpenBSD: getusershell.c,v 1.2 1996/08/19 08:24:15 tholo Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/file.h>
+#include <ctype.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);
+}
+
+#endif /* HAVE_GETUSERSHELL */