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krb5/SOURCES/Add-k5_dir_filenames-to-lib...

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From 9010a0dbf59771cb0a9c1e6fd5a18a92a1200ca7 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 5 Jun 2018 14:01:05 -0400
Subject: [PATCH] Add k5_dir_filenames() to libkrb5support
Add a support function to get a list of filenames from a directory in
sorted order.
(cherry picked from commit 27534121eb39089ff4335d8b465027e9ba783682)
---
src/include/k5-platform.h | 7 +
src/util/support/Makefile.in | 3 +
src/util/support/dir_filenames.c | 135 ++++++++++++++++++
src/util/support/libkrb5support-fixed.exports | 2 +
4 files changed, 147 insertions(+)
create mode 100644 src/util/support/dir_filenames.c
diff --git a/src/include/k5-platform.h b/src/include/k5-platform.h
index 07ef6a4ca..763408a09 100644
--- a/src/include/k5-platform.h
+++ b/src/include/k5-platform.h
@@ -44,6 +44,8 @@
* + constant time memory comparison
* + path manipulation
* + _, N_, dgettext, bindtextdomain (for localization)
+ * + getopt_long
+ * + fetching filenames from a directory
*/
#ifndef K5_PLATFORM_H
@@ -1148,4 +1150,9 @@ extern int k5_getopt_long(int nargc, char **nargv, char *options,
#define getopt_long k5_getopt_long
#endif /* HAVE_GETOPT_LONG */
+/* Set *fnames_out to a null-terminated list of filenames within dirname,
+ * sorted according to strcmp(). Return 0 on success, or ENOENT/ENOMEM. */
+int k5_dir_filenames(const char *dirname, char ***fnames_out);
+void k5_free_filenames(char **fnames);
+
#endif /* K5_PLATFORM_H */
diff --git a/src/util/support/Makefile.in b/src/util/support/Makefile.in
index caaf15822..4715e0391 100644
--- a/src/util/support/Makefile.in
+++ b/src/util/support/Makefile.in
@@ -85,6 +85,7 @@ STLIBOBJS= \
hex.o \
bcmp.o \
strerror_r.o \
+ dir_filenames.o \
$(GETTIMEOFDAY_ST_OBJ) \
$(IPC_ST_OBJ) \
$(STRLCPY_ST_OBJ) \
@@ -111,6 +112,7 @@ LIBOBJS= \
$(OUTPRE)hex.$(OBJEXT) \
$(OUTPRE)bcmp.$(OBJEXT) \
$(OUTPRE)strerror_r.$(OBJEXT) \
+ $(OUTPRE)dir_filenames.$(OBJEXT) \
$(GETTIMEOFDAY_OBJ) \
$(IPC_OBJ) \
$(STRLCPY_OBJ) \
@@ -147,6 +149,7 @@ SRCS=\
$(srcdir)/hex.c \
$(srcdir)/bcmp.c \
$(srcdir)/strerror_r.c \
+ $(srcdir)/dir_filenames.c \
$(srcdir)/t_utf8.c \
$(srcdir)/t_utf16.c \
$(srcdir)/getopt.c \
diff --git a/src/util/support/dir_filenames.c b/src/util/support/dir_filenames.c
new file mode 100644
index 000000000..9312b0238
--- /dev/null
+++ b/src/util/support/dir_filenames.c
@@ -0,0 +1,135 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* util/support/dir_filenames.c - fetch filenames in a directory */
+/*
+ * Copyright (C) 2018 by the Massachusetts Institute of Technology.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDER 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 "k5-platform.h"
+
+void
+k5_free_filenames(char **fnames)
+{
+ char **fn;
+
+ for (fn = fnames; fn != NULL && *fn != NULL; fn++)
+ free(*fn);
+ free(fnames);
+}
+
+/* Resize the filename list and add a name. */
+static int
+add_filename(char ***fnames, int *n_fnames, const char *name)
+{
+ char **newlist;
+
+ newlist = realloc(*fnames, (*n_fnames + 2) * sizeof(*newlist));
+ if (newlist == NULL)
+ return ENOMEM;
+ *fnames = newlist;
+ newlist[*n_fnames] = strdup(name);
+ if (newlist[*n_fnames] == NULL)
+ return ENOMEM;
+ (*n_fnames)++;
+ newlist[*n_fnames] = NULL;
+ return 0;
+}
+
+static int
+compare_with_strcmp(const void *a, const void *b)
+{
+ return strcmp(*(char **)a, *(char **)b);
+}
+
+#ifdef _WIN32
+
+int
+k5_dir_filenames(const char *dirname, char ***fnames_out)
+{
+ char *wildcard;
+ WIN32_FIND_DATA ffd;
+ HANDLE handle;
+ char **fnames = NULL;
+ int n_fnames = 0;
+
+ *fnames_out = NULL;
+
+ if (asprintf(&wildcard, "%s\\*", dirname) < 0)
+ return ENOMEM;
+ handle = FindFirstFile(wildcard, &ffd);
+ free(wildcard);
+ if (handle == INVALID_HANDLE_VALUE)
+ return ENOENT;
+
+ do {
+ if (add_filename(&fnames, &n_fnames, &ffd.cFileName) != 0) {
+ k5_free_filenames(fnames);
+ FindClose(handle);
+ return ENOMEM;
+ }
+ } while (FindNextFile(handle, &ffd) != 0);
+
+ FindClose(handle);
+ qsort(fnames, n_fnames, sizeof(*fnames), compare_with_strcmp);
+ *fnames_out = fnames;
+ return 0;
+}
+
+#else /* _WIN32 */
+
+#include <dirent.h>
+
+int
+k5_dir_filenames(const char *dirname, char ***fnames_out)
+{
+ DIR *dir;
+ struct dirent *ent;
+ char **fnames = NULL;
+ int n_fnames = 0;
+
+ *fnames_out = NULL;
+
+ dir = opendir(dirname);
+ if (dir == NULL)
+ return ENOENT;
+
+ while ((ent = readdir(dir)) != NULL) {
+ if (add_filename(&fnames, &n_fnames, ent->d_name) != 0) {
+ k5_free_filenames(fnames);
+ closedir(dir);
+ return ENOMEM;
+ }
+ }
+
+ closedir(dir);
+ qsort(fnames, n_fnames, sizeof(*fnames), compare_with_strcmp);
+ *fnames_out = fnames;
+ return 0;
+}
+
+#endif /* not _WIN32 */
diff --git a/src/util/support/libkrb5support-fixed.exports b/src/util/support/libkrb5support-fixed.exports
index a5e2ade04..16ed5a6c1 100644
--- a/src/util/support/libkrb5support-fixed.exports
+++ b/src/util/support/libkrb5support-fixed.exports
@@ -58,6 +58,8 @@ k5_path_split
k5_strerror_r
k5_utf8_to_utf16le
k5_utf16le_to_utf8
+k5_dir_filenames
+k5_free_filenames
krb5int_key_register
krb5int_key_delete
krb5int_getspecific
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