Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / core / ansiesc.c

diff --git a/qemu/roms/ipxe/src/core/ansiesc.c b/qemu/roms/ipxe/src/core/ansiesc.c
new file mode 100644 (file)
index 0000000..ca9a73c
--- /dev/null
+++ b/qemu/roms/ipxe/src/core/ansiesc.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <string.h>
+#include <assert.h>
+#include <ipxe/ansiesc.h>
+
+/** @file
+ *
+ * ANSI escape sequences
+ *
+ */
+
+/**
+ * Call ANSI escape sequence handler
+ *
+ * @v ctx              ANSI escape sequence context
+ * @v function         Control function identifier
+ * @v count            Parameter count
+ * @v params           Parameter list
+ */
+static void ansiesc_call_handler ( struct ansiesc_context *ctx,
+                                  unsigned int function, int count,
+                                  int params[] ) {
+       struct ansiesc_handler *handlers = ctx->handlers;
+       struct ansiesc_handler *handler;
+
+       for ( handler = handlers ; handler->function ; handler++ ) {
+               if ( handler->function == function ) {
+                       handler->handle ( ctx, count, params );
+                       break;
+               }
+       }
+}
+
+/**
+ * Process character that may be part of ANSI escape sequence
+ *
+ * @v ctx              ANSI escape sequence context
+ * @v c                        Character
+ * @ret c              Original character if not part of escape sequence
+ * @ret <0             Character was part of escape sequence
+ *
+ * ANSI escape sequences will be plucked out of the character stream
+ * and interpreted; once complete they will be passed to the
+ * appropriate handler if one exists in this ANSI escape sequence
+ * context.
+ *
+ * In the interests of code size, we are rather liberal about the
+ * sequences we are prepared to accept as valid.
+ */
+int ansiesc_process ( struct ansiesc_context *ctx, int c ) {
+
+       if ( ctx->count == 0 ) {
+               if ( c == ESC ) {
+                       /* First byte of CSI : begin escape sequence */
+                       ctx->count = 1;
+                       memset ( ctx->params, 0xff, sizeof ( ctx->params ) );
+                       ctx->function = 0;
+                       return -1;
+               } else {
+                       /* Normal character */
+                       return c;
+               }
+       } else {
+               if ( c == '[' ) {
+                       /* Second byte of CSI : do nothing */
+               } else if ( ( c >= '0' ) && ( c <= '9' ) ) {
+                       /* Parameter Byte : part of a parameter value */
+                       int *param = &ctx->params[ctx->count - 1];
+                       if ( *param < 0 )
+                               *param = 0;
+                       *param = ( ( *param * 10 ) + ( c - '0' ) );
+               } else if ( c == ';' ) {
+                       /* Parameter Byte : parameter delimiter */
+                       ctx->count++;
+                       if ( ctx->count > ( sizeof ( ctx->params ) /
+                                           sizeof ( ctx->params[0] ) ) ) {
+                               /* Excessive parameters : abort sequence */
+                               ctx->count = 0;
+                               DBG ( "Too many parameters in ANSI escape "
+                                     "sequence\n" );
+                       }
+               } else if ( ( ( c >= 0x20 ) && ( c <= 0x2f ) ) ||
+                           ( c == '?' ) ) {
+                       /* Intermediate Byte */
+                       ctx->function <<= 8;
+                       ctx->function |= c;
+               } else {
+                       /* Treat as Final Byte.  Zero ctx->count before 
+                        * calling handler to avoid potential infinite loops.
+                        */
+                       int count = ctx->count;
+                       ctx->count = 0;
+                       ctx->function <<= 8;
+                       ctx->function |= c;
+                       ansiesc_call_handler ( ctx, ctx->function,
+                                              count, ctx->params );
+               }
+               return -1;
+       }
+}