Annotation of src/usr.bin/tmux/xterm-keys.c, Revision 1.4
1.4 ! nicm 1: /* $OpenBSD: xterm-keys.c,v 1.3 2009/11/05 19:35:16 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
21: #include <string.h>
22:
23: #include "tmux.h"
24:
25: /*
26: * xterm-style function keys append one of the following values before the last
27: * character:
28: *
29: * 2 Shift
30: * 3 Alt
31: * 4 Shift + Alt
32: * 5 Ctrl
33: * 6 Shift + Ctrl
34: * 7 Alt + Ctrl
35: * 8 Shift + Alt + Ctrl
36: *
37: * Rather than parsing them, just match against a table.
38: *
39: * There are two forms for F1-F4 (\\033O_P or \\033[1;_P). We accept either but
40: * always output the latter (it comes first in the table).
41: */
42:
43: int xterm_keys_match(const char *, const char *, size_t);
44: int xterm_keys_modifiers(const char *, const char *, size_t);
45:
46: struct xterm_keys_entry {
47: int key;
48: const char *template;
49: };
50:
51: struct xterm_keys_entry xterm_keys_table[] = {
52: { KEYC_F1, "\033[1;_P" },
1.3 nicm 53: { KEYC_F1, "\033O_P" },
1.1 nicm 54: { KEYC_F2, "\033[1;_Q" },
1.3 nicm 55: { KEYC_F2, "\033O_Q" },
1.1 nicm 56: { KEYC_F3, "\033[1;_R" },
1.3 nicm 57: { KEYC_F3, "\033O_R" },
1.1 nicm 58: { KEYC_F4, "\033[1;_S" },
1.3 nicm 59: { KEYC_F4, "\033O_S" },
1.1 nicm 60: { KEYC_F5, "\033[15;_~" },
61: { KEYC_F6, "\033[17;_~" },
62: { KEYC_F7, "\033[18;_~" },
63: { KEYC_F8, "\033[19;_~" },
64: { KEYC_F9, "\033[20;_~" },
65: { KEYC_F10, "\033[21;_~" },
66: { KEYC_F11, "\033[23;_~" },
67: { KEYC_F12, "\033[24;_~" },
68: { KEYC_F13, "\033[25;_~" },
69: { KEYC_F14, "\033[26;_~" },
70: { KEYC_F15, "\033[28;_~" },
71: { KEYC_F16, "\033[29;_~" },
72: { KEYC_F17, "\033[31;_~" },
73: { KEYC_F18, "\033[32;_~" },
74: { KEYC_F19, "\033[33;_~" },
75: { KEYC_F20, "\033[34;_~" },
76: { KEYC_UP, "\033[1;_A" },
77: { KEYC_DOWN, "\033[1;_B" },
78: { KEYC_RIGHT, "\033[1;_C" },
79: { KEYC_LEFT, "\033[1;_D" },
80: { KEYC_HOME, "\033[1;_H" },
81: { KEYC_END, "\033[1;_F" },
82: { KEYC_PPAGE, "\033[5;_~" },
83: { KEYC_NPAGE, "\033[6;_~" },
84: { KEYC_IC, "\033[2;_~" },
85: { KEYC_DC, "\033[3;_~" },
86: };
87:
1.4 ! nicm 88: /*
! 89: * Match key against buffer, treating _ as a wildcard. Return -1 for no match,
! 90: * 0 for match, 1 if the end of the buffer is reached (need more data).
! 91: */
1.1 nicm 92: int
93: xterm_keys_match(const char *template, const char *buf, size_t len)
94: {
95: size_t pos;
96:
1.4 ! nicm 97: if (len == 0)
1.1 nicm 98: return (0);
99:
100: pos = 0;
101: do {
102: if (*template != '_' && buf[pos] != *template)
1.4 ! nicm 103: return (-1);
1.1 nicm 104: } while (pos++ != len && *++template != '\0');
105:
1.4 ! nicm 106: if (*template != '\0') /* partial */
! 107: return (1);
! 108:
! 109: return (0);
1.1 nicm 110: }
111:
112: /* Find modifiers based on template. */
113: int
114: xterm_keys_modifiers(const char *template, const char *buf, size_t len)
115: {
116: size_t idx;
117:
118: idx = strcspn(template, "_");
119: if (idx >= len)
120: return (0);
121: switch (buf[idx]) {
122: case '2':
123: return (KEYC_SHIFT);
124: case '3':
125: return (KEYC_ESCAPE);
126: case '4':
127: return (KEYC_SHIFT|KEYC_ESCAPE);
128: case '5':
129: return (KEYC_CTRL);
130: case '6':
131: return (KEYC_SHIFT|KEYC_CTRL);
132: case '7':
133: return (KEYC_ESCAPE|KEYC_CTRL);
134: case '8':
135: return (KEYC_SHIFT|KEYC_ESCAPE|KEYC_CTRL);
136: }
137: return (0);
138: }
139:
1.4 ! nicm 140: /*
! 141: * Lookup key from a buffer against the table. Returns 0 for found (and the
! 142: * key), -1 for not found, 1 for partial match.
! 143: */
1.1 nicm 144: int
1.4 ! nicm 145: xterm_keys_find(const char *buf, size_t len, size_t *size, int *key)
1.1 nicm 146: {
147: struct xterm_keys_entry *entry;
148: u_int i;
149:
150: for (i = 0; i < nitems(xterm_keys_table); i++) {
151: entry = &xterm_keys_table[i];
1.4 ! nicm 152: switch (xterm_keys_match(entry->template, buf, len)) {
! 153: case 0:
! 154: *size = strlen(entry->template);
! 155: *key = entry->key;
! 156: *key |= xterm_keys_modifiers(entry->template, buf, len);
! 157: return (0);
! 158: case 1:
! 159: return (1);
! 160: }
1.1 nicm 161: }
1.4 ! nicm 162: return (-1);
1.1 nicm 163: }
164:
165: /* Lookup a key number from the table. */
166: char *
167: xterm_keys_lookup(int key)
168: {
169: struct xterm_keys_entry *entry;
170: u_int i;
171: int modifiers;
172: char *out;
173:
174: #define KEY_MODIFIERS(key, modifiers) \
175: (((key) & (KEYC_SHIFT|KEYC_ESCAPE|KEYC_CTRL)) == (modifiers))
176: modifiers = 0;
177: if (KEY_MODIFIERS(key, KEYC_SHIFT))
178: modifiers = 2;
179: else if (KEY_MODIFIERS(key, KEYC_ESCAPE))
180: modifiers = 3;
181: else if (KEY_MODIFIERS(key, KEYC_SHIFT|KEYC_ESCAPE))
182: modifiers = 4;
183: else if (KEY_MODIFIERS(key, KEYC_CTRL))
184: modifiers = 5;
185: else if (KEY_MODIFIERS(key, KEYC_SHIFT|KEYC_CTRL))
186: modifiers = 6;
187: else if (KEY_MODIFIERS(key, KEYC_ESCAPE|KEYC_CTRL))
188: modifiers = 7;
189: else if (KEY_MODIFIERS(key, KEYC_SHIFT|KEYC_ESCAPE|KEYC_CTRL))
190: modifiers = 8;
191: #undef KEY_MODIFIERS
192:
193: /*
194: * If the key has no modifiers, return NULL and let it fall through to
195: * the normal lookup.
196: */
197: if (modifiers == 0)
198: return (NULL);
199:
200: /* Otherwise, find the key in the table. */
201: key &= ~(KEYC_SHIFT|KEYC_ESCAPE|KEYC_CTRL);
202: for (i = 0; i < nitems(xterm_keys_table); i++) {
203: entry = &xterm_keys_table[i];
204: if (key == entry->key)
205: break;
206: }
207: if (i == nitems(xterm_keys_table))
208: return (NULL);
209:
210: /* Copy the template and replace the modifier. */
211: out = xstrdup(entry->template);
212: out[strcspn(out, "_")] = '0' + modifiers;
213: return (out);
214: }
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