| /* ----------------------------------------------------------------------- * |
| * |
| * 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; |
| } |
| } |
| } |