1 /* $NetBSD: parse.c,v 1.35 2016/02/17 19:47:49 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 1.35 2016/02/17 19:47:49 christos Exp $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 /* 47 * parse.c: parse an editline extended command 48 * 49 * commands are: 50 * 51 * bind 52 * echotc 53 * edit 54 * gettc 55 * history 56 * settc 57 * setty 58 */ 59 #include <stdlib.h> 60 #include <string.h> 61 62 #include "el.h" 63 #include "parse.h" 64 65 private const struct { 66 const Char *name; 67 int (*func)(EditLine *, int, const Char **); 68 } cmds[] = { 69 { STR("bind"), map_bind }, 70 { STR("echotc"), terminal_echotc }, 71 { STR("edit"), el_editmode }, 72 { STR("history"), hist_command }, 73 { STR("telltc"), terminal_telltc }, 74 { STR("settc"), terminal_settc }, 75 { STR("setty"), tty_stty }, 76 { NULL, NULL } 77 }; 78 79 80 /* parse_line(): 81 * Parse a line and dispatch it 82 */ 83 protected int 84 parse_line(EditLine *el, const Char *line) 85 { 86 const Char **argv; 87 int argc; 88 TYPE(Tokenizer) *tok; 89 90 tok = FUN(tok,init)(NULL); 91 FUN(tok,str)(tok, line, &argc, &argv); 92 argc = FUN(el,parse)(el, argc, argv); 93 FUN(tok,end)(tok); 94 return argc; 95 } 96 97 98 /* el_parse(): 99 * Command dispatcher 100 */ 101 public int 102 FUN(el,parse)(EditLine *el, int argc, const Char *argv[]) 103 { 104 const Char *ptr; 105 int i; 106 107 if (argc < 1) 108 return -1; 109 ptr = Strchr(argv[0], ':'); 110 if (ptr != NULL) { 111 Char *tprog; 112 size_t l; 113 114 if (ptr == argv[0]) 115 return 0; 116 l = (size_t)(ptr - argv[0] - 1); 117 tprog = el_malloc((l + 1) * sizeof(*tprog)); 118 if (tprog == NULL) 119 return 0; 120 (void) Strncpy(tprog, argv[0], l); 121 tprog[l] = '\0'; 122 ptr++; 123 l = (size_t)el_match(el->el_prog, tprog); 124 el_free(tprog); 125 if (!l) 126 return 0; 127 } else 128 ptr = argv[0]; 129 130 for (i = 0; cmds[i].name != NULL; i++) 131 if (Strcmp(cmds[i].name, ptr) == 0) { 132 i = (*cmds[i].func) (el, argc, argv); 133 return -i; 134 } 135 return -1; 136 } 137 138 139 /* parse__escape(): 140 * Parse a string of the form ^<char> \<odigit> \<char> \U+xxxx and return 141 * the appropriate character or -1 if the escape is not valid 142 */ 143 protected int 144 parse__escape(const Char **ptr) 145 { 146 const Char *p; 147 wint_t c; 148 149 p = *ptr; 150 151 if (p[1] == 0) 152 return -1; 153 154 if (*p == '\\') { 155 p++; 156 switch (*p) { 157 case 'a': 158 c = '\007'; /* Bell */ 159 break; 160 case 'b': 161 c = '\010'; /* Backspace */ 162 break; 163 case 't': 164 c = '\011'; /* Horizontal Tab */ 165 break; 166 case 'n': 167 c = '\012'; /* New Line */ 168 break; 169 case 'v': 170 c = '\013'; /* Vertical Tab */ 171 break; 172 case 'f': 173 c = '\014'; /* Form Feed */ 174 break; 175 case 'r': 176 c = '\015'; /* Carriage Return */ 177 break; 178 case 'e': 179 c = '\033'; /* Escape */ 180 break; 181 case 'U': /* Unicode \U+xxxx or \U+xxxxx format */ 182 { 183 int i; 184 const Char hex[] = STR("0123456789ABCDEF"); 185 const Char *h; 186 ++p; 187 if (*p++ != '+') 188 return -1; 189 c = 0; 190 for (i = 0; i < 5; ++i) { 191 h = Strchr(hex, *p++); 192 if (!h && i < 4) 193 return -1; 194 else if (h) 195 c = (c << 4) | ((int)(h - hex)); 196 else 197 --p; 198 } 199 if (c > 0x10FFFF) /* outside valid character range */ 200 return -1; 201 break; 202 } 203 case '0': 204 case '1': 205 case '2': 206 case '3': 207 case '4': 208 case '5': 209 case '6': 210 case '7': 211 { 212 int cnt, ch; 213 214 for (cnt = 0, c = 0; cnt < 3; cnt++) { 215 ch = *p++; 216 if (ch < '0' || ch > '7') { 217 p--; 218 break; 219 } 220 c = (c << 3) | (ch - '0'); 221 } 222 if ((c & (wint_t)0xffffff00) != (wint_t)0) 223 return -1; 224 --p; 225 break; 226 } 227 default: 228 c = *p; 229 break; 230 } 231 } else if (*p == '^') { 232 p++; 233 c = (*p == '?') ? '\177' : (*p & 0237); 234 } else 235 c = *p; 236 *ptr = ++p; 237 return c; 238 } 239 240 /* parse__string(): 241 * Parse the escapes from in and put the raw string out 242 */ 243 protected Char * 244 parse__string(Char *out, const Char *in) 245 { 246 Char *rv = out; 247 int n; 248 249 for (;;) 250 switch (*in) { 251 case '\0': 252 *out = '\0'; 253 return rv; 254 255 case '\\': 256 case '^': 257 if ((n = parse__escape(&in)) == -1) 258 return NULL; 259 *out++ = (Char)n; 260 break; 261 262 case 'M': 263 if (in[1] == '-' && in[2] != '\0') { 264 *out++ = '\033'; 265 in += 2; 266 break; 267 } 268 /*FALLTHROUGH*/ 269 270 default: 271 *out++ = *in++; 272 break; 273 } 274 } 275 276 277 /* parse_cmd(): 278 * Return the command number for the command string given 279 * or -1 if one is not found 280 */ 281 protected int 282 parse_cmd(EditLine *el, const Char *cmd) 283 { 284 el_bindings_t *b = el->el_map.help; 285 size_t i; 286 287 for (i = 0; i < el->el_map.nfunc; i++) 288 if (Strcmp(b[i].name, cmd) == 0) 289 return b[i].func; 290 return -1; 291 } 292