[console] Do not share ANSI escape context between lineconsole users

An ANSI escape sequence context cannot be shared between multiple
users.  Make the ANSI escape sequence context part of the line console
definition and provide individual contexts for each user.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/interface/vmware/vmconsole.c

 	.prefix = "log ",
 };
 
+/** VMware logfile console ANSI escape sequence handlers */
+static struct ansiesc_handler vmconsole_handlers[] = {
+	{ 0, NULL }
+};
+
 /** VMware logfile line console */
 static struct line_console vmconsole_line = {
 	.buffer = vmconsole_buffer.message,
 	.len = sizeof ( vmconsole_buffer.message ),
+	.ctx = {
+		.handlers = vmconsole_handlers,
+	},
 };
 
 /** VMware logfile console recursion marker */

src/core/lineconsole.c

 #include <ipxe/ansiesc.h>
 #include <ipxe/lineconsole.h>
 
-/** Line-based console ANSI escape sequence handlers */
-static struct ansiesc_handler line_ansiesc_handlers[] = {
-	{ 0, NULL }
-};
-
-/** Line-based console ANSI escape sequence context */
-static struct ansiesc_context line_ansiesc_ctx = {
-	.handlers = line_ansiesc_handlers,
-};
-
 /**
  * Print a character to a line-based console
  *
 size_t line_putchar ( struct line_console *line, int character ) {
 
 	/* Strip ANSI escape sequences */
-	character = ansiesc_process ( &line_ansiesc_ctx, character );
+	character = ansiesc_process ( &line->ctx, character );
 	if ( character < 0 )
 		return 0;
 

src/include/ipxe/lineconsole.h

 FILE_LICENCE ( GPL2_OR_LATER );
 
 #include <stdint.h>
+#include <ipxe/ansiesc.h>
 
 /** A line-based console */
 struct line_console {
 	 * a potential terminating NUL.
 	 */
 	size_t len;
+	/** ANSI escape sequence context */
+	struct ansiesc_context ctx;
 };
 
 extern size_t line_putchar ( struct line_console *line, int character );

src/net/udp/syslog.c

 /** Syslog line buffer */
 static char syslog_buffer[SYSLOG_BUFSIZE];
 
+/** Syslog ANSI escape sequence handlers */
+static struct ansiesc_handler syslog_handlers[] = {
+	{ 0, NULL }
+};
+
 /** Syslog line console */
 static struct line_console syslog_line = {
 	.buffer = syslog_buffer,
 	.len = sizeof ( syslog_buffer ),
+	.ctx = {
+		.handlers = syslog_handlers,
+	},
 };
 
 /** Syslog recursion marker */