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Annotation of GNUtools/libg++/libio/iogetline.c, revision 1.1

1.1     ! root        1: /* 
        !             2: Copyright (C) 1993 Free Software Foundation
        !             3: 
        !             4: This file is part of the GNU IO Library.  This library is free
        !             5: software; you can redistribute it and/or modify it under the
        !             6: terms of the GNU General Public License as published by the
        !             7: Free Software Foundation; either version 2, or (at your option)
        !             8: any later version.
        !             9: 
        !            10: This library is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13: GNU General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU General Public License
        !            16: along with GNU CC; see the file COPYING.  If not, write to
        !            17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            18: 
        !            19: As a special exception, if you link this library with files
        !            20: compiled with a GNU compiler to produce an executable, this does not cause
        !            21: the resulting executable to be covered by the GNU General Public License.
        !            22: This exception does not however invalidate any other reasons why
        !            23: the executable file might be covered by the GNU General Public License. */
        !            24: 
        !            25: #include "libioP.h"
        !            26: #include <string.h>
        !            27: 
        !            28: /* Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
        !            29: 
        !            30:    Read chars into buf (of size n), until delim is seen.
        !            31:    Return number of chars read (at most n-1).
        !            32:    If extract_delim < 0, leave delimiter unread.
        !            33:    If extract_delim > 0, insert delim in output. */
        !            34: 
        !            35: _IO_size_t
        !            36: _IO_getline(fp, buf, n, delim, extract_delim)
        !            37:      _IO_FILE *fp;
        !            38:      char* buf;
        !            39:      _IO_size_t n;
        !            40:      int delim;
        !            41:      int extract_delim;
        !            42: {
        !            43:   register char *ptr = buf;
        !            44:   if (n <= 0)
        !            45:     return EOF;
        !            46:   n--; /* Leave space for final '\0'. */
        !            47:   do
        !            48:     {
        !            49:       _IO_size_t len = fp->_IO_read_end - fp->_IO_read_ptr;
        !            50:       char *t;
        !            51:       if (len <= 0)
        !            52:        if (__underflow(fp) == EOF)
        !            53:          break;
        !            54:        else
        !            55:          len = fp->_IO_read_end - fp->_IO_read_ptr;
        !            56:       if (len >= n)
        !            57:        len = n;
        !            58:       t = (char*)memchr((void*)fp->_IO_read_ptr, delim, len);
        !            59:       if (t != NULL)
        !            60:        {
        !            61:          _IO_size_t old_len = ptr-buf;
        !            62:          len = t - fp->_IO_read_ptr;
        !            63:          if (extract_delim >= 0)
        !            64:            {
        !            65:              t++;
        !            66:              old_len++;
        !            67:              if (extract_delim > 0)
        !            68:                len++;
        !            69:            }
        !            70:          memcpy((void*)ptr, (void*)fp->_IO_read_ptr, len);
        !            71:          ptr[len] = 0;
        !            72:          fp->_IO_read_ptr = t;
        !            73:          return old_len + len;
        !            74:        }
        !            75:       memcpy((void*)ptr, (void*)fp->_IO_read_ptr, len);
        !            76:       fp->_IO_read_ptr += len;
        !            77:       ptr += len;
        !            78:       n -= len;
        !            79:     } while (n != 0);
        !            80:   *ptr = 0;
        !            81:   return ptr - buf;
        !            82: }

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