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-rw-r--r--lib/concat-filename.c73
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diff --git a/lib/concat-filename.c b/lib/concat-filename.c
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+/* Construct a full filename from a directory and a relative filename.
+ Copyright (C) 2001-2004, 2006-2023 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <haible@clisp.cons.org>. */
+
+#include <config.h>
+
+/* Specification. */
+#include "concat-filename.h"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "filename.h"
+
+/* Concatenate a directory filename, a relative filename and an optional
+ suffix. The directory may end with the directory separator. The second
+ argument may not start with the directory separator (it is relative).
+ Return a freshly allocated filename. Return NULL and set errno
+ upon memory allocation failure. */
+char *
+concatenated_filename (const char *directory, const char *filename,
+ const char *suffix)
+{
+ char *result;
+ char *p;
+
+ if (strcmp (directory, ".") == 0)
+ {
+ /* No need to prepend the directory. */
+ result = (char *) malloc (strlen (filename)
+ + (suffix != NULL ? strlen (suffix) : 0)
+ + 1);
+ if (result == NULL)
+ return NULL; /* errno is set here */
+ p = result;
+ }
+ else
+ {
+ size_t directory_len = strlen (directory);
+ int need_slash =
+ (directory_len > FILE_SYSTEM_PREFIX_LEN (directory)
+ && !ISSLASH (directory[directory_len - 1]));
+ result = (char *) malloc (directory_len + need_slash
+ + strlen (filename)
+ + (suffix != NULL ? strlen (suffix) : 0)
+ + 1);
+ if (result == NULL)
+ return NULL; /* errno is set here */
+ memcpy (result, directory, directory_len);
+ p = result + directory_len;
+ if (need_slash)
+ *p++ = '/';
+ }
+ p = stpcpy (p, filename);
+ if (suffix != NULL)
+ stpcpy (p, suffix);
+ return result;
+}