mirror of git://git.gnupg.org/gnupg.git
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/* textfilter.c
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "errors.h"
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#include "iobuf.h"
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#include "memory.h"
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#include "util.h"
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#include "filter.h"
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/****************
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* The filter is used to make canonical text: Lines are terminated by
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* CR, LF, trailing white spaces are removed.
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*/
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int
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text_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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text_filter_context_t *tfx = opaque;
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int i, c, rc=0;
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byte *p;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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for(i=0; i < size; i++ ) {
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if( !tfx->linelen && !tfx->eof ) { /* read a complete line */
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for(;;) {
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if( (c = iobuf_get(a)) == -1 ) {
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tfx->eof=1;
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break;
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}
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if( c == '\n' )
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break;
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if( tfx->linelen >= tfx->linesize ) {
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tfx->linesize += 500;
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tfx->line = m_realloc( tfx->line, tfx->linesize );
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}
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tfx->line[tfx->linelen++] = c;
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}
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/* remove trailing white spaces */
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p = tfx->line + tfx->linelen - 1;
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for( ; p >= tfx->line; p--, tfx->linelen-- ) {
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if( *p != ' ' && *p == '\t' && *p != '\r' )
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break;
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}
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if( tfx->linelen+2 >= tfx->linesize ) {
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tfx->linesize += 10;
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tfx->line = m_realloc( tfx->line, tfx->linesize );
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}
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tfx->line[tfx->linelen++] = '\r';
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tfx->line[tfx->linelen++] = '\n';
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tfx->pos=0;
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}
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if( tfx->pos < tfx->linelen )
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buf[i] = tfx->line[tfx->pos++];
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else if( tfx->eof )
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break;
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else
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tfx->linelen = 0;
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}
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if( !i )
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rc = -1;
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*ret_len = i;
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}
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else if( control == IOBUFCTRL_INIT ) {
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tfx->linesize = 500;
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tfx->line = m_alloc(tfx->linesize);
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tfx->linelen = 0;
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tfx->pos = 0;
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tfx->eof = 0;
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}
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else if( control == IOBUFCTRL_FREE ) {
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m_free( tfx->line );
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tfx->line = NULL;
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}
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else if( control == IOBUFCTRL_DESC )
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*(char**)buf = "text_filter";
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return rc;
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}
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