mirror of
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141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
/* textfilter.c
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG 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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* GNUPG 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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static int
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read_line( byte *buf, size_t *r_buflen, IOBUF a )
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{
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int c;
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int rc = 0;
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byte *p;
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size_t buflen;
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int no_lf=0;
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size_t n;
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buflen = *r_buflen;
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assert(buflen >= 20 );
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buflen -= 3; /* leave some room for CR,LF and one extra */
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for(c=0, n=0; n < buflen && (c=iobuf_get2(a)) != -1 && c != '\n'; )
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buf[n++] = c;
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buf[n] = 0;
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if( c == -1 )
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rc = -1;
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else if( c != '\n' ) {
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IOBUF b = iobuf_temp();
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while( (c=iobuf_get2(a)) != -1 && c != '\n' ) {
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iobuf_put(b,c);
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if( c != ' ' && c != '\t' && c != '\r' )
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break;
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}
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if( c == '\n' ) { /* okay we can skip the rest of the line */
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iobuf_close(b);
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}
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else {
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iobuf_unget_and_close_temp(a,b);
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no_lf = 1;
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}
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}
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if( !no_lf ) {
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/* append CR,LF after removing trailing wspaces */
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for(p=buf+n-1; n; n--, p-- ) {
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assert( *p != '\n' );
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if( *p != ' ' && *p != '\t' && *p != '\r' ) {
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p[1] = '\r';
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p[2] = '\n';
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n += 2;
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break;
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}
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}
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if( !n ) {
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buf[0] = '\r';
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buf[1] = '\n';
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n = 2;
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}
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}
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*r_buflen = n;
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return rc;
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}
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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 rc=0;
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size_t len, n, nn;
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if( control == IOBUFCTRL_UNDERFLOW ) {
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assert( size > 30 );
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len = 0;
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while( !rc && len < size ) {
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if( tfx->idx < tfx->len ) { /* flush the last buffer */
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n = tfx->len;
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for(nn=tfx->idx; len < size && nn < n ; nn++ )
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buf[len++] = tfx->buf[nn];
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tfx->idx = nn;
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continue;
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}
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if( tfx->eof ) {
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rc = -1;
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continue;
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}
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n = DIM(tfx->buf);
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tfx->idx = 0;
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if( read_line( tfx->buf, &n, a ) == -1 )
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tfx->eof = 1;
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tfx->len = n;
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}
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*ret_len = len;
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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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