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73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/* Construct a full filename from a directory and a relative filename.
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Copyright (C) 2001-2004, 2006-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <haible@clisp.cons.org>. */
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#include <config.h>
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/* Specification. */
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#include "concat-filename.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "filename.h"
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/* Concatenate a directory filename, a relative filename and an optional
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suffix. The directory may end with the directory separator. The second
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argument may not start with the directory separator (it is relative).
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Return a freshly allocated filename. Return NULL and set errno
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upon memory allocation failure. */
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char *
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concatenated_filename (const char *directory, const char *filename,
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const char *suffix)
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{
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char *result;
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char *p;
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if (strcmp (directory, ".") == 0)
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{
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/* No need to prepend the directory. */
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result = (char *) malloc (strlen (filename)
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+ (suffix != NULL ? strlen (suffix) : 0)
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+ 1);
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if (result == NULL)
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return NULL; /* errno is set here */
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p = result;
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}
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else
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{
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size_t directory_len = strlen (directory);
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int need_slash =
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(directory_len > FILE_SYSTEM_PREFIX_LEN (directory)
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&& !ISSLASH (directory[directory_len - 1]));
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result = (char *) malloc (directory_len + need_slash
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+ strlen (filename)
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+ (suffix != NULL ? strlen (suffix) : 0)
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+ 1);
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if (result == NULL)
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return NULL; /* errno is set here */
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memcpy (result, directory, directory_len);
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p = result + directory_len;
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if (need_slash)
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*p++ = '/';
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}
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p = stpcpy (p, filename);
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if (suffix != NULL)
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stpcpy (p, suffix);
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return result;
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}
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