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/* ----------------------------------------------------------------------- *
*
* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* line_input.c
*
* Line-oriented input discupline
*/
#include "file.h"
#include <errno.h>
#include <syslinux/idle.h>
ssize_t __line_input(struct file_info * fp, char *buf, size_t bufsize,
ssize_t(*get_char) (struct file_info *, void *, size_t))
{
size_t n = 0;
char ch;
int rv;
ssize_t(*const Write) (struct file_info *, const void *, size_t) =
fp->oop->write;
for (;;) {
rv = get_char(fp, &ch, 1);
if (rv != 1) {
syslinux_idle();
continue;
}
switch (ch) {
case '\n': /* Ignore incoming linefeed */
break;
case '\r':
*buf = '\n';
Write(fp, "\n", 1);
return n + 1;
case '\b':
if (n > 0) {
n--;
buf--;
Write(fp, "\b \b", 3);
}
break;
case '\x15': /* Ctrl-U */
while (n) {
n--;
buf--;
Write(fp, "\b \b", 3);
}
break;
default:
if (n < bufsize - 1) {
*buf = ch;
Write(fp, buf, 1);
n++;
buf++;
}
break;
}
}
}
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