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author | Florian Weimer <fweimer@redhat.com> | 2017-11-12 09:53:06 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2017-11-12 09:53:06 +0100 |
commit | 1ffe1ccb6ec5771765f1f6f0c439ed07bf345d67 (patch) | |
tree | a5d96c2270d9f919e4cda3c17649e5cec4ff519e /support/xreadlink.c | |
parent | 456b40a97f7e867803b2f47f5fcd3f1fa4bc1f6e (diff) | |
download | glibc-1ffe1ccb6ec5771765f1f6f0c439ed07bf345d67.zip glibc-1ffe1ccb6ec5771765f1f6f0c439ed07bf345d67.tar.gz glibc-1ffe1ccb6ec5771765f1f6f0c439ed07bf345d67.tar.bz2 |
support: Add xstrndup, xunlink, xreadlink, support_create_temp_directory
Diffstat (limited to 'support/xreadlink.c')
-rw-r--r-- | support/xreadlink.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/support/xreadlink.c b/support/xreadlink.c new file mode 100644 index 0000000..aec58a2 --- /dev/null +++ b/support/xreadlink.c @@ -0,0 +1,44 @@ +/* Error-checking, allocating wrapper for readlink. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library 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. + + The GNU C Library 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 the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <scratch_buffer.h> +#include <support/check.h> +#include <support/support.h> +#include <xunistd.h> + +char * +xreadlink (const char *path) +{ + struct scratch_buffer buf; + scratch_buffer_init (&buf); + + while (true) + { + ssize_t count = readlink (path, buf.data, buf.length); + if (count < 0) + FAIL_EXIT1 ("readlink (\"%s\"): %m", path); + if (count < buf.length) + { + char *result = xstrndup (buf.data, count); + scratch_buffer_free (&buf); + return result; + } + if (!scratch_buffer_grow (&buf)) + FAIL_EXIT1 ("scratch_buffer_grow in xreadlink"); + } +} |