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Annotation of GNUtools/libg++/libio/isgetline.cc, revision 1.1

1.1     ! root        1: /* This is part of libio/iostream, providing -*- C++ -*- input/output.
        !             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 "iostream.h"
        !            27: #include <string.h>
        !            28: 
        !            29: istream& istream::getline(char* buf, int len, char delim)
        !            30: {
        !            31:   _gcount = 0;
        !            32:   if (ipfx1())
        !            33:     {
        !            34:       streambuf *sb = rdbuf();
        !            35:       long count = _IO_getline(sb, buf, len, delim, -1);
        !            36:       if (count == len-1)
        !            37:        set(ios::failbit);
        !            38:       else {
        !            39:        int ch = sb->sbumpc();
        !            40:        if (ch == EOF)
        !            41:          set(ios::failbit|ios::eofbit);
        !            42:        else if (ch == (unsigned char)delim)
        !            43:          count++;
        !            44:        else
        !            45:          sb->sungetc(); // Leave delimiter unread.
        !            46:       }
        !            47:       _gcount = count;
        !            48:     }
        !            49:   return *this;
        !            50: }
        !            51: 
        !            52: istream& istream::get(char* buf, int len, char delim)
        !            53: {
        !            54:   _gcount = 0;
        !            55:   if (ipfx1())
        !            56:     {
        !            57:       streambuf *sbuf = rdbuf();
        !            58:       long count = _IO_getline(sbuf, buf, len, delim, -1);
        !            59:       if (count < 0 || (count == 0 && sbuf->sgetc() == EOF))
        !            60:        set(ios::failbit|ios::eofbit);
        !            61:       else
        !            62:        _gcount = count;
        !            63:     }
        !            64:   return *this;
        !            65: }
        !            66: 
        !            67: 
        !            68: // from Doug Schmidt
        !            69: 
        !            70: #define CHUNK_SIZE 512
        !            71: 
        !            72: /* Reads an arbitrarily long input line terminated by a user-specified
        !            73:    TERMINATOR.  Super-nifty trick using recursion avoids unnecessary calls
        !            74:    to NEW! */
        !            75: 
        !            76: char *_sb_readline (streambuf *sb, long& total, char terminator) 
        !            77: {
        !            78:     char buf[CHUNK_SIZE+1];
        !            79:     char *ptr;
        !            80:     int ch;
        !            81:     
        !            82:     long count = sb->sgetline(buf, CHUNK_SIZE+1, terminator, -1);
        !            83:     if (count == EOF)
        !            84:        return NULL;
        !            85:     ch = sb->sbumpc();
        !            86:     long old_total = total;
        !            87:     total += count;
        !            88:     if (ch != EOF && ch != terminator) {
        !            89:        total++; // Include ch in total.
        !            90:        ptr = _sb_readline(sb, total, terminator);
        !            91:        if (ptr) {
        !            92:            memcpy(ptr + old_total, buf, count);
        !            93:            ptr[old_total+count] = ch;
        !            94:        }
        !            95:        return ptr;
        !            96:     }
        !            97:     
        !            98:     if (ptr = new char[total+1]) {
        !            99:        ptr[total] = '\0';
        !           100:        memcpy(ptr + total - count, buf, count);
        !           101:        return ptr;
        !           102:     } 
        !           103:     else 
        !           104:        return NULL;
        !           105: }
        !           106: 
        !           107: /* Reads an arbitrarily long input line terminated by TERMINATOR.
        !           108:    This routine allocates its own memory, so the user should
        !           109:    only supply the address of a (char *). */
        !           110: 
        !           111: istream& istream::gets(char **s, char delim /* = '\n' */)
        !           112: {
        !           113:     if (ipfx1()) {
        !           114:        long size = 0;
        !           115:        streambuf *sb = rdbuf();
        !           116:        *s = _sb_readline (sb, size, delim);
        !           117:        _gcount = *s ? size : 0;
        !           118:        if (sb->_flags & _IO_EOF_SEEN) {
        !           119:            set(ios::eofbit);
        !           120:            if (_gcount == 0)
        !           121:                set(ios::failbit);
        !           122:        }
        !           123:     }
        !           124:     else {
        !           125:        _gcount = 0;
        !           126:        *s = NULL;
        !           127:     }
        !           128:     return *this;
        !           129: }

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