| #ifndef _GPXE_ANSIESC_H |
| #define _GPXE_ANSIESC_H |
| |
| /** @file |
| * |
| * ANSI escape sequences |
| * |
| * ANSI X3.64 (aka ECMA-48 or ISO/IEC 6429, available from |
| * http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-048.pdf) |
| * defines escape sequences consisting of: |
| * |
| * A Control Sequence Introducer (CSI) |
| * |
| * Zero or more Parameter Bytes (P) |
| * |
| * Zero or more Intermediate Bytes (I) |
| * |
| * A Final Byte (F) |
| * |
| * The CSI consists of ESC (0x1b) followed by "[" (0x5b). The |
| * Parameter Bytes, for a standardised (i.e. not private or |
| * experimental) sequence, consist of a list of ASCII decimal integers |
| * separated by semicolons. The Intermediate Bytes (in the range 0x20 |
| * to 0x2f) and the Final Byte (in the range 0x40 to 0x4f) determine |
| * the control function. |
| * |
| */ |
| |
| FILE_LICENCE ( GPL2_OR_LATER ); |
| |
| /** A handler for an escape sequence */ |
| struct ansiesc_handler { |
| /** The control function identifier |
| * |
| * The control function identifier consists of the |
| * Intermediate Bytes (if any) and the Final Byte. In |
| * practice, no more than one immediate byte is ever used, so |
| * the byte combination can be efficiently expressed as a |
| * single integer, in the obvious way (with the Final Byte |
| * being the least significant byte). |
| */ |
| unsigned int function; |
| /** Handle escape sequence |
| * |
| * @v count Parameter count |
| * @v params Parameter list |
| * |
| * A negative parameter value indicates that the parameter was |
| * omitted and that the default value for this control |
| * function should be used. |
| * |
| * Since all parameters are optional, there is no way to |
| * distinguish between "zero parameters" and "single parameter |
| * omitted". Consequently, the parameter list will always |
| * contain at least one item. |
| */ |
| void ( * handle ) ( unsigned int count, int params[] ); |
| }; |
| |
| /** Maximum number of parameters within a single escape sequence */ |
| #define ANSIESC_MAX_PARAMS 4 |
| |
| /** |
| * ANSI escape sequence context |
| * |
| * This provides temporary storage for processing escape sequences, |
| * and points to the list of escape sequence handlers. |
| */ |
| struct ansiesc_context { |
| /** Array of handlers |
| * |
| * Must be terminated by a handler with @c function set to |
| * zero. |
| */ |
| struct ansiesc_handler *handlers; |
| /** Parameter count |
| * |
| * Will be zero when not currently in an escape sequence. |
| */ |
| unsigned int count; |
| /** Parameter list */ |
| int params[ANSIESC_MAX_PARAMS]; |
| /** Control function identifier */ |
| unsigned int function; |
| }; |
| |
| /** Escape character */ |
| #define ESC 0x1b |
| |
| /** Control Sequence Introducer */ |
| #define CSI "\033[" |
| |
| /** |
| * @defgroup ansifuncs ANSI escape sequence function identifiers |
| * @{ |
| */ |
| |
| /** Cursor position */ |
| #define ANSIESC_CUP 'H' |
| |
| /** Erase in page */ |
| #define ANSIESC_ED 'J' |
| |
| /** Erase from cursor to end of page */ |
| #define ANSIESC_ED_TO_END 0 |
| |
| /** Erase from start of page to cursor */ |
| #define ANSIESC_ED_FROM_START 1 |
| |
| /** Erase whole page */ |
| #define ANSIESC_ED_ALL 2 |
| |
| /** Select graphic rendition */ |
| #define ANSIESC_SGR 'm' |
| |
| /** @} */ |
| |
| extern int ansiesc_process ( struct ansiesc_context *ctx, int c ); |
| |
| #endif /* _GPXE_ANSIESC_H */ |