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-rw-r--r--lib/getcwd-lgpl.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/lib/getcwd-lgpl.c b/lib/getcwd-lgpl.c
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+++ b/lib/getcwd-lgpl.c
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+/* Copyright (C) 2011-2023 Free Software Foundation, Inc.
+ This file is part of gnulib.
+
+ 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/>. */
+
+#include <config.h>
+
+/* Specification */
+#include <unistd.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if GNULIB_GETCWD
+/* Favor GPL getcwd.c if both getcwd and getcwd-lgpl modules are in use. */
+typedef int dummy;
+#else
+
+/* Get the name of the current working directory, and put it in SIZE
+ bytes of BUF. Returns NULL if the directory couldn't be determined
+ (perhaps because the absolute name was longer than PATH_MAX, or
+ because of missing read/search permissions on parent directories)
+ or SIZE was too small. If successful, returns BUF. If BUF is
+ NULL, an array is allocated with 'malloc'; the array is SIZE bytes
+ long, unless SIZE == 0, in which case it is as big as
+ necessary. */
+
+# undef getcwd
+# if defined _WIN32 && !defined __CYGWIN__
+# define getcwd _getcwd
+# endif
+
+char *
+rpl_getcwd (char *buf, size_t size)
+{
+ char *ptr;
+ char *result;
+
+ /* Handle single size operations. */
+ if (buf)
+ {
+ if (!size)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+ return getcwd (buf, size);
+ }
+
+ if (size)
+ {
+ buf = malloc (size);
+ if (!buf)
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ result = getcwd (buf, size);
+ if (!result)
+ free (buf);
+ return result;
+ }
+
+ /* Flexible sizing requested. Avoid over-allocation for the common
+ case of a name that fits within a 4k page, minus some space for
+ local variables, to be sure we don't skip over a guard page. */
+ {
+ char tmp[4032];
+ size = sizeof tmp;
+ ptr = getcwd (tmp, size);
+ if (ptr)
+ {
+ result = strdup (ptr);
+ if (!result)
+ errno = ENOMEM;
+ return result;
+ }
+ if (errno != ERANGE)
+ return NULL;
+ }
+
+ /* My what a large directory name we have. */
+ do
+ {
+ size <<= 1;
+ ptr = realloc (buf, size);
+ if (ptr == NULL)
+ {
+ free (buf);
+ errno = ENOMEM;
+ return NULL;
+ }
+ buf = ptr;
+ result = getcwd (buf, size);
+ }
+ while (!result && errno == ERANGE);
+
+ if (!result)
+ free (buf);
+ else
+ {
+ /* Here result == buf. */
+ /* Shrink result before returning it. */
+ size_t actual_size = strlen (result) + 1;
+ if (actual_size < size)
+ {
+ char *shrinked_result = realloc (result, actual_size);
+ if (shrinked_result != NULL)
+ result = shrinked_result;
+ }
+ }
+ return result;
+}
+
+#endif