2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 FILE_LICENCE ( GPL2_OR_LATER );
24 #include <ipxe/ansiesc.h>
28 * ANSI escape sequences
33 * Call ANSI escape sequence handler
35 * @v ctx ANSI escape sequence context
36 * @v function Control function identifier
37 * @v count Parameter count
38 * @v params Parameter list
40 static void ansiesc_call_handler ( struct ansiesc_context *ctx,
41 unsigned int function, int count,
43 struct ansiesc_handler *handlers = ctx->handlers;
44 struct ansiesc_handler *handler;
46 for ( handler = handlers ; handler->function ; handler++ ) {
47 if ( handler->function == function ) {
48 handler->handle ( ctx, count, params );
55 * Process character that may be part of ANSI escape sequence
57 * @v ctx ANSI escape sequence context
59 * @ret c Original character if not part of escape sequence
60 * @ret <0 Character was part of escape sequence
62 * ANSI escape sequences will be plucked out of the character stream
63 * and interpreted; once complete they will be passed to the
64 * appropriate handler if one exists in this ANSI escape sequence
67 * In the interests of code size, we are rather liberal about the
68 * sequences we are prepared to accept as valid.
70 int ansiesc_process ( struct ansiesc_context *ctx, int c ) {
72 if ( ctx->count == 0 ) {
74 /* First byte of CSI : begin escape sequence */
76 memset ( ctx->params, 0xff, sizeof ( ctx->params ) );
80 /* Normal character */
85 /* Second byte of CSI : do nothing */
86 } else if ( ( c >= '0' ) && ( c <= '9' ) ) {
87 /* Parameter Byte : part of a parameter value */
88 int *param = &ctx->params[ctx->count - 1];
91 *param = ( ( *param * 10 ) + ( c - '0' ) );
92 } else if ( c == ';' ) {
93 /* Parameter Byte : parameter delimiter */
95 if ( ctx->count > ( sizeof ( ctx->params ) /
96 sizeof ( ctx->params[0] ) ) ) {
97 /* Excessive parameters : abort sequence */
99 DBG ( "Too many parameters in ANSI escape "
102 } else if ( ( ( c >= 0x20 ) && ( c <= 0x2f ) ) ||
104 /* Intermediate Byte */
108 /* Treat as Final Byte. Zero ctx->count before
109 * calling handler to avoid potential infinite loops.
111 int count = ctx->count;
115 ansiesc_call_handler ( ctx, ctx->function,
116 count, ctx->params );