gen/getttyent.c

   1 /*
   2  * Copyright (c) 1999, 2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1989, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56 #include "xlocale_private.h"
  57
  58 #include <ttyent.h>
  59 #include <stdio.h>
  60 #include <ctype.h>
  61 #include <string.h>
  62 #include <stdlib.h>
  63 #include <regex.h>
  64 #include <limits.h>
  65
  66 static char zapchar;
  67 static FILE *tf;
  68
  69 struct ttyent *
  70 getttynam(tty)
  71         const char *tty;
  72 {
  73         register struct ttyent *t;
  74
  75         setttyent();
  76         while ((t = getttyent()) != NULL)
  77                 if (!strcmp(tty, t->ty_name))
  78                         break;
  79         endttyent();
  80         return (t);
  81 }
  82
  83 static char *skip(), *value();
  84
  85 /*
  86  * 4372480: Support for sequences in the tty name.  Expressions like [000-999]
  87  * for decimal sequences and [0x0-0xf] for hexidecimal sequences causes a
  88  * sequence of all combinations of names to be returned by getttyent().
  89  *
  90  * There is also a slot=nn option, which will cause getttyent() to return
  91  * non-existent ttyent structs until the slot number nn is reached.  Note, slot
  92  * numbers begin at 1.
  93  */
  94 struct seq {
  95         int first;
  96         int count;
  97         int index;
  98         char fmt[NAME_MAX + 17];
  99 };
 100
 101 static const char *brapat = "\\[(.*)]";
 102 static regex_t brapreg;
 103 static const char *decpat = "^([0-9]+)-([0-9]+)$";
 104 static regex_t decpreg;
 105 static const char *hexpat = "^0x([0-9a-f]+)-0x([0-9a-f]+)$";
 106 static regex_t hexpreg;
 107 static struct seq *seq = NULL;
 108 static int slot;
 109
 110 struct ttyent *
 111 getttyent(void)
 112 {
 113         static struct ttyent tty;
 114         static const struct ttyent nonexistent = {
 115                 "\01",  /* this shouldn't match anything */
 116                 NULL,
 117                 NULL,
 118                 0,
 119                 NULL,
 120                 NULL,
 121                 NULL
 122         };
 123         register int c;
 124         register char *p;
 125 #define MAXLINELENGTH   1024
 126         static char *line = NULL;
 127         locale_t loc = __current_locale();
 128         int newslot, hex;
 129         long b, e;
 130         regmatch_t match[3], save, bracket;
 131
 132         if ( line == NULL ) {
 133                 line = malloc(MAXLINELENGTH);
 134                 if( line == NULL )
 135                         return NULL;
 136         }
 137
 138         if (!tf && !setttyent())
 139                 return (NULL);
 140
 141 restart:
 142         if (slot < seq->first) {
 143                 /*
 144                  * the slot= option was set, and we are returning non-existent
 145                  * entries until we catch up.
 146                  */
 147                 slot++;
 148                 return (struct ttyent *)&nonexistent;
 149         }
 150
 151         if (seq->count > 0) {
 152                 /*
 153                  * generate the next tty name; the rest of the tty entries
 154                  * is the same.
 155                  */
 156                 sprintf(tty.ty_name, seq->fmt, seq->index++);
 157                 slot++;
 158                 seq->count--;
 159                 return &tty;
 160         }
 161
 162         if (slot == seq->first) {
 163                 /*
 164                  * this was a regular entry with slot=
 165                  */
 166                 slot++;
 167                 return &tty;
 168         }
 169
 170         for (;;) {
 171                 if (!fgets(p = line, MAXLINELENGTH, tf))
 172                         return (NULL);
 173                 /* skip lines that are too big */
 174                 if (!index(p, '\n')) {
 175                         while ((c = getc(tf)) != '\n' && c != EOF)
 176                                 ;
 177                         continue;
 178                 }
 179                 while (isspace_l(*p, loc))
 180                         ++p;
 181                 if (*p && *p != '#')
 182                         break;
 183         }
 184
 185         zapchar = 0;
 186         tty.ty_name = p;
 187         p = skip(p);
 188         if (!*(tty.ty_getty = p))
 189                 tty.ty_getty = tty.ty_type = NULL;
 190         else {
 191                 p = skip(p);
 192                 if (!*(tty.ty_type = p))
 193                         tty.ty_type = NULL;
 194                 else
 195                         p = skip(p);
 196         }
 197         tty.ty_status = 0;
 198         tty.ty_window = NULL;
 199         tty.ty_onerror = NULL;
 200         tty.ty_onoption = NULL;
 201
 202 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace_l(p[sizeof(e) - 1], loc)
 203 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 204         newslot = -1;
 205         for (; *p; p = skip(p)) {
 206                 if (scmp(_TTYS_OFF))
 207                         tty.ty_status &= ~TTY_ON;
 208                 else if (scmp(_TTYS_ON))
 209                         tty.ty_status |= TTY_ON;
 210                 else if (scmp(_TTYS_SECURE))
 211                         tty.ty_status |= TTY_SECURE;
 212                 else if (vcmp(_TTYS_WINDOW))
 213                         tty.ty_window = value(p);
 214                 else if (vcmp(_TTYS_ONERROR))
 215                         tty.ty_onerror = value(p);
 216                 else if (vcmp(_TTYS_ONOPTION))
 217                         tty.ty_onoption = value(p);
 218                 else if (vcmp(_TTYS_SLOT)) {
 219                         char *slotstr = value(p);
 220                         if (slotstr)
 221                                 newslot = atoi(slotstr);
 222                 } else
 223                         break;
 224         }
 225
 226         if (zapchar == '#' || *p == '#')
 227                 while ((c = *++p) == ' ' || c == '\t')
 228                         ;
 229         tty.ty_comment = p;
 230         if (*p == 0)
 231                 tty.ty_comment = 0;
 232         if ((p = index(p, '\n')) != NULL)
 233                 *p = '\0';
 234
 235         /* check if tty.tyname has a sequence */
 236         if (regexec(&brapreg, tty.ty_name, 3, match, 0) != 0)
 237                 goto out;
 238
 239         /*
 240          * save the range of the bracketed range, so we can find the strings
 241          * before and after
 242          */
 243         bracket = match[0];
 244         /* use REG_STARTEND to limit matching with the bracketed range */
 245         match[0] = save = match[1];
 246         if (regexec(&decpreg, tty.ty_name, 3, match, REG_STARTEND) == 0) {
 247                 /* a decimal range */
 248                 b = strtol(tty.ty_name + match[1].rm_so, NULL, 10);
 249                 e = strtol(tty.ty_name + match[2].rm_so, NULL, 10);
 250                 hex = 0;
 251         } else {
 252                 match[0] = save;
 253                 if (regexec(&hexpreg, tty.ty_name, 3, match, REG_STARTEND) == 0) {
 254                         /* a hexidecimal range */
 255                         b = strtol(tty.ty_name + match[1].rm_so, NULL, 16);
 256                         e = strtol(tty.ty_name + match[2].rm_so, NULL, 16);
 257                         hex = 1;
 258                 } else
 259                         goto out;
 260         }
 261         if (b > e)      /* skip */
 262                 goto restart;
 263
 264         /* seq->first is already less than slot, so just leave it */
 265         seq->count = e - b + 1;
 266         seq->index = b;
 267         /*
 268          * The fmt string contains the characters before the bracket, the
 269          * a format specifier (either decimal or hex) and any characters
 270          * after the bracket.  Note that the length of the lower range is
 271          * use as a minimum digit length, with zero fill, so the format
 272          * specifier will look something like %03d.
 273          */
 274         sprintf(seq->fmt, "%.*s%%0%d%c%s",
 275                 (int)bracket.rm_so, tty.ty_name,
 276                 (int)(match[1].rm_eo - match[1].rm_so),
 277                 hex ? 'x' : 'd',
 278                 tty.ty_name + bracket.rm_eo);
 279
 280 out:
 281         if (newslot > slot) {
 282                 /* set up to skip until newslot */
 283                 seq->first = newslot;
 284                 goto restart;
 285         }
 286         if (seq->count > 0)     /* restart if we are doing a sequence */
 287                 goto restart;
 288         /* regular single value return */
 289         slot++;
 290         return (&tty);
 291 }
 292
 293 #define QUOTED  1
 294
 295 /*
 296  * Skip over the current field, removing quotes, and return a pointer to
 297  * the next field.
 298  */
 299 static char *
 300 skip(p)
 301         register char *p;
 302 {
 303         register char *t;
 304         register int c, q;
 305
 306         for (q = 0, t = p; (c = *p) != '\0'; p++) {
 307                 if (c == '"') {
 308                         q ^= QUOTED;    /* obscure, but nice */
 309                         continue;
 310                 }
 311                 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
 312                         p++;
 313                 *t++ = *p;
 314                 if (q == QUOTED)
 315                         continue;
 316                 if (c == '#') {
 317                         zapchar = c;
 318                         *p = 0;
 319                         break;
 320                 }
 321                 if (c == '\t' || c == ' ' || c == '\n') {
 322                         zapchar = c;
 323                         *p++ = 0;
 324                         while ((c = *p) == '\t' || c == ' ' || c == '\n')
 325                                 p++;
 326                         break;
 327                 }
 328         }
 329         *--t = '\0';
 330         return (p);
 331 }
 332
 333 static char *
 334 value(p)
 335         register char *p;
 336 {
 337
 338         return ((p = index(p, '=')) ? ++p : NULL);
 339 }
 340
 341 int
 342 setttyent()
 343 {
 344
 345         /* initialize seq and the three regexp patterns */
 346         if (!seq) {
 347                 if (regcomp(&brapreg, brapat, REG_EXTENDED) != 0)
 348                         return 0;
 349                 if (regcomp(&decpreg, decpat, REG_EXTENDED) != 0) {
 350                         regfree(&brapreg);
 351                         return 0;
 352                 }
 353                 if (regcomp(&hexpreg, hexpat, REG_EXTENDED | REG_ICASE) != 0) {
 354                         regfree(&decpreg);
 355                         regfree(&brapreg);
 356                         return 0;
 357                 }
 358                 if ((seq = malloc(sizeof(struct seq))) == NULL) {
 359                         regfree(&hexpreg);
 360                         regfree(&decpreg);
 361                         regfree(&brapreg);
 362                         return 0;
 363                 }
 364         }
 365         seq->first = seq->count = 0;
 366         slot = 1;
 367
 368         if (tf) {
 369                 (void)rewind(tf);
 370                 return (1);
 371         } else if ((tf = fopen(_PATH_TTYS, "r")) != NULL)
 372                 return (1);
 373         return (0);
 374 }
 375
 376 int
 377 endttyent()
 378 {
 379         int rval;
 380
 381         if (tf) {
 382                 rval = !(fclose(tf) == EOF);
 383                 tf = NULL;
 384                 return (rval);
 385         }
 386         return (1);
 387 }