mirror of git://sourceware.org/git/glibc.git
109 lines
3.0 KiB
C
109 lines
3.0 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 "libioP.h"
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#include <string.h>
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size_t
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_IO_getline (FILE *fp, char *buf, size_t n, int delim,
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int extract_delim)
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{
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return _IO_getline_info (fp, buf, n, delim, extract_delim, (int *) 0);
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}
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libc_hidden_def (_IO_getline)
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/* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
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Read chars into buf (of size n), until delim is seen.
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Return number of chars read (at most n).
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Does not put a terminating '\0' in buf.
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If extract_delim < 0, leave delimiter unread.
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If extract_delim > 0, insert delim in output. */
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size_t
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_IO_getline_info (FILE *fp, char *buf, size_t n, int delim,
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int extract_delim, int *eof)
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{
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char *ptr = buf;
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if (eof != NULL)
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*eof = 0;
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if (__builtin_expect (fp->_mode, -1) == 0)
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_IO_fwide (fp, -1);
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while (n != 0)
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{
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ssize_t len = fp->_IO_read_end - fp->_IO_read_ptr;
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if (len <= 0)
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{
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int c = __uflow (fp);
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if (c == EOF)
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{
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if (eof)
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*eof = c;
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break;
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}
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if (c == delim)
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{
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if (extract_delim > 0)
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*ptr++ = c;
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else if (extract_delim < 0)
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_IO_sputbackc (fp, c);
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if (extract_delim > 0)
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++len;
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return ptr - buf;
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}
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*ptr++ = c;
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n--;
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}
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else
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{
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char *t;
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if ((size_t) len >= n)
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len = n;
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t = (char *) memchr ((void *) fp->_IO_read_ptr, delim, len);
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if (t != NULL)
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{
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size_t old_len = ptr-buf;
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len = t - fp->_IO_read_ptr;
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if (extract_delim >= 0)
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{
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++t;
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if (extract_delim > 0)
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++len;
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}
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memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
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fp->_IO_read_ptr = t;
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return old_len + len;
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}
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memcpy ((void *) ptr, (void *) fp->_IO_read_ptr, len);
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fp->_IO_read_ptr += len;
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ptr += len;
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n -= len;
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}
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}
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return ptr - buf;
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}
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libc_hidden_def (_IO_getline_info)
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