lib/libedit/parse.c

   1 /*      $NetBSD: parse.c,v 1.22 2005/05/29 04:58:15 lukem 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 1.22 2005/05/29 04:58:15 lukem 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"),        term_echotc     },
  66         { STR("edit"),          el_editmode     },
  67         { STR("history"),       hist_command    },
  68         { STR("telltc"),        term_telltc     },
  69         { STR("settc"),         term_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
  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
  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 = 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 = 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
 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 & 0xffffff00) != 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 *
 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
 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 }