3f5e3f5d06
This is a variant of fgets which fails with ERANGE if the buffer is too small, and the buffer length is given as an argument of type size_t. This function will be useful for implementing NSS file reading operations. Compared to a direct implementation using the public API, it avoids an lseek system call in case the line terminator can be found in the internal read buffer.
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <errno.h>
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#include "libioP.h"
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#include "stdio.h"
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/* fseeko.c defines this as an alias if __OFF_T_MATCHES_OFF64_T. */
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#ifndef __OFF_T_MATCHES_OFF64_T
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int
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__fseeko64 (FILE *fp, off64_t offset, int whence)
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{
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int result;
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CHECK_FILE (fp, -1);
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_IO_acquire_lock (fp);
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result = _IO_fseek (fp, offset, whence);
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_IO_release_lock (fp);
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return result;
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}
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libc_hidden_def (__fseeko64)
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weak_alias (__fseeko64, fseeko64)
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#endif
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