91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
#ident "$Id: line_input.c,v 1.6 2005/01/20 18:41:12 hpa Exp $"
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 2004 H. Peter Anvin - All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* line_input.c
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*
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* Line-oriented input discupline
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*/
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#include "file.h"
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#include <errno.h>
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#include <syslinux.h>
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ssize_t __line_input(struct file_info *fp, char *buf, size_t bufsize,
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ssize_t (*get_char)(struct file_info *, void *, size_t))
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{
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size_t n = 0;
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char ch;
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int rv;
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ssize_t (* const Write)(struct file_info *, const void *, size_t) =
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fp->oop->write;
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for(;;) {
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rv = get_char(fp, &ch, 1);
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if ( rv != 1 ) {
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syslinux_idle();
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continue;
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}
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switch ( ch ) {
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case '\n': /* Ignore incoming linefeed */
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break;
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case '\r':
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*buf = '\n';
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Write(fp, "\n", 1);
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return n+1;
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case '\b':
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if ( n > 0 ) {
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n--; buf--;
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Write(fp, "\b \b", 3);
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}
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break;
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case '\x15': /* Ctrl-U */
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while ( n ) {
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n--; buf--;
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Write(fp, "\b \b", 3);
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}
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break;
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default:
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if ( n < bufsize-1 ) {
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*buf = ch;
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Write(fp, buf, 1);
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n++;
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buf++;
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}
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break;
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}
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}
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}
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