1 /* $NetBSD: parse.c,v 1.26 2011/08/16 16:25:15 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "config.h"
36 #if !defined(lint) && !defined(SCCSID)
37 #if 0
38 static char sccsid[] = "@(#)parse.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: parse.c,v 1.26 2011/08/16 16:25:15 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43
44 /*
45 * parse.c: parse an editline extended command
46 *
47 * commands are:
48 *
49 * bind
50 * echotc
51 * edit
52 * gettc
53 * history
54 * settc
55 * setty
56 */
57 #include "el.h"
58 #include <stdlib.h>
59
60 private const struct {
61 const Char *name;
62 int (*func)(EditLine *, int, const Char **);
63 } cmds[] = {
64 { STR("bind"), map_bind },
65 { STR("echotc"), terminal_echotc },
66 { STR("edit"), el_editmode },
67 { STR("history"), hist_command },
68 { STR("telltc"), terminal_telltc },
69 { STR("settc"), terminal_settc },
70 { STR("setty"), tty_stty },
71 { NULL, NULL }
72 };
73
74
75 /* parse_line():
76 * Parse a line and dispatch it
77 */
78 protected int
parse_line(EditLine * el,const Char * line)79 parse_line(EditLine *el, const Char *line)
80 {
81 const Char **argv;
82 int argc;
83 TYPE(Tokenizer) *tok;
84
85 tok = FUN(tok,init)(NULL);
86 FUN(tok,str)(tok, line, &argc, &argv);
87 argc = FUN(el,parse)(el, argc, argv);
88 FUN(tok,end)(tok);
89 return argc;
90 }
91
92
93 /* el_parse():
94 * Command dispatcher
95 */
96 public int
FUN(el,parse)97 FUN(el,parse)(EditLine *el, int argc, const Char *argv[])
98 {
99 const Char *ptr;
100 int i;
101
102 if (argc < 1)
103 return -1;
104 ptr = Strchr(argv[0], ':');
105 if (ptr != NULL) {
106 Char *tprog;
107 size_t l;
108
109 if (ptr == argv[0])
110 return 0;
111 l = (size_t)(ptr - argv[0] - 1);
112 tprog = el_malloc((l + 1) * sizeof(*tprog));
113 if (tprog == NULL)
114 return 0;
115 (void) Strncpy(tprog, argv[0], l);
116 tprog[l] = '\0';
117 ptr++;
118 l = (size_t)el_match(el->el_prog, tprog);
119 el_free(tprog);
120 if (!l)
121 return 0;
122 } else
123 ptr = argv[0];
124
125 for (i = 0; cmds[i].name != NULL; i++)
126 if (Strcmp(cmds[i].name, ptr) == 0) {
127 i = (*cmds[i].func) (el, argc, argv);
128 return -i;
129 }
130 return -1;
131 }
132
133
134 /* parse__escape():
135 * Parse a string of the form ^<char> \<odigit> \<char> \U+xxxx and return
136 * the appropriate character or -1 if the escape is not valid
137 */
138 protected int
parse__escape(const Char ** ptr)139 parse__escape(const Char **ptr)
140 {
141 const Char *p;
142 Int c;
143
144 p = *ptr;
145
146 if (p[1] == 0)
147 return -1;
148
149 if (*p == '\\') {
150 p++;
151 switch (*p) {
152 case 'a':
153 c = '\007'; /* Bell */
154 break;
155 case 'b':
156 c = '\010'; /* Backspace */
157 break;
158 case 't':
159 c = '\011'; /* Horizontal Tab */
160 break;
161 case 'n':
162 c = '\012'; /* New Line */
163 break;
164 case 'v':
165 c = '\013'; /* Vertical Tab */
166 break;
167 case 'f':
168 c = '\014'; /* Form Feed */
169 break;
170 case 'r':
171 c = '\015'; /* Carriage Return */
172 break;
173 case 'e':
174 c = '\033'; /* Escape */
175 break;
176 case 'U': /* Unicode \U+xxxx or \U+xxxxx format */
177 {
178 int i;
179 const Char hex[] = STR("0123456789ABCDEF");
180 const Char *h;
181 ++p;
182 if (*p++ != '+')
183 return -1;
184 c = 0;
185 for (i = 0; i < 5; ++i) {
186 h = Strchr(hex, *p++);
187 if (!h && i < 4)
188 return -1;
189 else if (h)
190 c = (c << 4) | ((int)(h - hex));
191 else
192 --p;
193 }
194 if (c > 0x10FFFF) /* outside valid character range */
195 return -1;
196 break;
197 }
198 case '0':
199 case '1':
200 case '2':
201 case '3':
202 case '4':
203 case '5':
204 case '6':
205 case '7':
206 {
207 int cnt, ch;
208
209 for (cnt = 0, c = 0; cnt < 3; cnt++) {
210 ch = *p++;
211 if (ch < '0' || ch > '7') {
212 p--;
213 break;
214 }
215 c = (c << 3) | (ch - '0');
216 }
217 if ((c & (wint_t)0xffffff00) != (wint_t)0)
218 return -1;
219 --p;
220 break;
221 }
222 default:
223 c = *p;
224 break;
225 }
226 } else if (*p == '^') {
227 p++;
228 c = (*p == '?') ? '\177' : (*p & 0237);
229 } else
230 c = *p;
231 *ptr = ++p;
232 return c;
233 }
234
235 /* parse__string():
236 * Parse the escapes from in and put the raw string out
237 */
238 protected Char *
parse__string(Char * out,const Char * in)239 parse__string(Char *out, const Char *in)
240 {
241 Char *rv = out;
242 int n;
243
244 for (;;)
245 switch (*in) {
246 case '\0':
247 *out = '\0';
248 return rv;
249
250 case '\\':
251 case '^':
252 if ((n = parse__escape(&in)) == -1)
253 return NULL;
254 *out++ = n;
255 break;
256
257 case 'M':
258 if (in[1] == '-' && in[2] != '\0') {
259 *out++ = '\033';
260 in += 2;
261 break;
262 }
263 /*FALLTHROUGH*/
264
265 default:
266 *out++ = *in++;
267 break;
268 }
269 }
270
271
272 /* parse_cmd():
273 * Return the command number for the command string given
274 * or -1 if one is not found
275 */
276 protected int
parse_cmd(EditLine * el,const Char * cmd)277 parse_cmd(EditLine *el, const Char *cmd)
278 {
279 el_bindings_t *b;
280
281 for (b = el->el_map.help; b->name != NULL; b++)
282 if (Strcmp(b->name, cmd) == 0)
283 return b->func;
284 return -1;
285 }
286