Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 143 insertions, 0 deletions

diff --git a/REORG.TODO/misc/getusershell.c b/REORG.TODO/misc/getusershell.c
new file mode 100644
index 0000000000..fc2c43b771
--- /dev/null
+++ b/REORG.TODO/misc/getusershell.c
@@ -0,0 +1,143 @@
+/*
+ * 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)getusershell.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#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.
+ */
+
+/* NB: we do not initialize okshells here.  The initialization needs
+   relocations.  These interfaces are used so rarely that this is not
+   justified.  Instead explicitly initialize the array when it is
+   used.  */
+#if 0
+static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
+#else
+static const char *okshells[3];
+#endif
+static char **curshell, **shells, *strings;
+static char **initshells (void) __THROW;
+
+/*
+ * 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);
+}
+
+void
+endusershell (void)
+{
+
+	free(shells);
+	shells = NULL;
+	free(strings);
+	strings = NULL;
+	curshell = NULL;
+}
+
+void
+setusershell (void)
+{
+
+	curshell = initshells();
+}
+
+static char **
+initshells (void)
+{
+	char **sp, *cp;
+	FILE *fp;
+	struct stat64 statb;
+	size_t flen;
+
+	free(shells);
+	shells = NULL;
+	free(strings);
+	strings = NULL;
+	if ((fp = fopen(_PATH_SHELLS, "rce")) == NULL)
+		goto init_okshells_noclose;
+	if (fstat64(fileno(fp), &statb) == -1) {
+	init_okshells:
+		(void)fclose(fp);
+	init_okshells_noclose:
+		okshells[0] = _PATH_BSHELL;
+		okshells[1] = _PATH_CSHELL;
+		return (char **) okshells;
+	}
+	if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3)
+		goto init_okshells;
+	flen = statb.st_size + 3;
+	if ((strings = malloc(flen)) == NULL)
+		goto init_okshells;
+	shells = malloc(statb.st_size / 3 * sizeof (char *));
+	if (shells == NULL) {
+		free(strings);
+		strings = NULL;
+		goto init_okshells;
+	}
+	sp = shells;
+	cp = strings;
+	while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
+		while (*cp != '#' && *cp != '/' && *cp != '\0')
+			cp++;
+		if (*cp == '#' || *cp == '\0' || cp[1] == '\0')
+			continue;
+		*sp++ = cp;
+		while (!isspace(*cp) && *cp != '#' && *cp != '\0')
+			cp++;
+		*cp++ = '\0';
+	}
+	*sp = NULL;
+	(void)fclose(fp);
+	return (shells);
+}