| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | #include <ctype.h> |
| 5 | |
| 6 | #include "tweak.h" |
| 7 | |
| 8 | typedef union keytab keytab; |
| 9 | |
| 10 | union keytab { |
| 11 | enum {ACTION, EXTENDED} type; |
| 12 | struct { |
| 13 | int type; |
| 14 | keyact action; |
| 15 | } a; |
| 16 | struct { |
| 17 | int type; |
| 18 | keytab *extended[256]; |
| 19 | } e; |
| 20 | }; |
| 21 | |
| 22 | keytab *base[256] = { NULL256 }; |
| 23 | |
| 24 | /* |
| 25 | * Bind a key sequence to an action. |
| 26 | */ |
| 27 | void bind_key (char *sequence, int len, keyact action) { |
| 28 | keytab *(*table)[256]; |
| 29 | int k, i; |
| 30 | |
| 31 | table = &base; |
| 32 | while (--len) { |
| 33 | k = (unsigned char) *sequence++; |
| 34 | if ( !(*table)[k] ) { |
| 35 | /* |
| 36 | * We must create an EXTENDED entry. |
| 37 | */ |
| 38 | (*table)[k] = malloc(sizeof(base[0]->e)); |
| 39 | (*table)[k]->type = EXTENDED; |
| 40 | for (i=0; i<256; i++) |
| 41 | (*table)[k]->e.extended[i] = NULL; |
| 42 | } else if ( (*table)[k]->type == ACTION ) { |
| 43 | /* |
| 44 | * A subsequence is already bound: fail. |
| 45 | */ |
| 46 | return; |
| 47 | } |
| 48 | table = &(*table)[k]->e.extended; |
| 49 | } |
| 50 | k = (unsigned char) *sequence; |
| 51 | if ( !(*table)[k] ) { |
| 52 | /* |
| 53 | * We can bind the key. |
| 54 | */ |
| 55 | (*table)[k] = malloc(sizeof(base[0]->a)); |
| 56 | (*table)[k]->type = ACTION; |
| 57 | (*table)[k]->a.action = action; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Format an ASCII code into a printable description of the key stroke. |
| 63 | */ |
| 64 | static void strkey (char *s, int k) { |
| 65 | k &= 255; /* force unsigned */ |
| 66 | if (k==27) |
| 67 | strcpy(s, " ESC"); |
| 68 | else if (k<32 || k==127) |
| 69 | sprintf(s, " ^%c", k ^ 64); |
| 70 | else if (k<127) |
| 71 | sprintf(s, " %c", k); |
| 72 | else |
| 73 | sprintf(s, " <0x%2X>", k); |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Get and process a key stroke. |
| 78 | */ |
| 79 | void proc_key (void) { |
| 80 | keytab *kt; |
| 81 | |
| 82 | #if defined(unix) && !defined(GO32) |
| 83 | if (update_required) |
| 84 | update(); |
| 85 | safe_update = TRUE; |
| 86 | #endif |
| 87 | last_char = display_getkey(); |
| 88 | #if defined(unix) && !defined(GO32) |
| 89 | safe_update = FALSE; |
| 90 | #endif |
| 91 | strcpy(message, "Unknown key sequence"); |
| 92 | strkey(message+strlen(message), last_char); |
| 93 | kt = base[(unsigned char) last_char]; |
| 94 | if (!kt) { |
| 95 | display_beep(); |
| 96 | while (display_input_to_flush()) |
| 97 | strkey(message+strlen(message), display_getkey()); |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | while (kt->type == EXTENDED) { |
| 102 | #if defined(unix) && !defined(GO32) |
| 103 | if (update_required) |
| 104 | update(); |
| 105 | safe_update = TRUE; |
| 106 | #endif |
| 107 | last_char = display_getkey(); |
| 108 | #if defined(unix) && !defined(GO32) |
| 109 | safe_update = FALSE; |
| 110 | #endif |
| 111 | strkey(message+strlen(message), last_char); |
| 112 | kt = kt->e.extended[(unsigned char) last_char]; |
| 113 | if (!kt) { |
| 114 | display_beep(); |
| 115 | while (display_input_to_flush()) |
| 116 | strkey(message+strlen(message), display_getkey()); |
| 117 | return; |
| 118 | } |
| 119 | } |
| 120 | message[0] = '\0'; /* clear the "unknown" message */ |
| 121 | (*kt->a.action)(); |
| 122 | } |