gen/getttyent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1989, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <ttyent.h>
  60 #include <stdio.h>
  61 #include <ctype.h>
  62 #include <string.h>
  63 #include <stdlib.h>
  64
  65 static char zapchar;
  66 static FILE *tf;
  67
  68 struct ttyent *
  69 getttynam(tty)
  70         const char *tty;
  71 {
  72         register struct ttyent *t;
  73
  74         setttyent();
  75         while (t = getttyent())
  76                 if (!strcmp(tty, t->ty_name))
  77                         break;
  78         endttyent();
  79         return (t);
  80 }
  81
  82 struct ttyent *
  83 getttyent()
  84 {
  85         static struct ttyent tty;
  86         register int c;
  87         register char *p;
  88 #define MAXLINELENGTH   1024
  89         static char *line = NULL;
  90         static char *skip(), *value();
  91
  92         if ( line == NULL ) {
  93                 line = malloc(MAXLINELENGTH);
  94                 if( line == NULL )
  95                         return NULL;
  96         }
  97
  98         if (!tf && !setttyent())
  99                 return (NULL);
 100         for (;;) {
 101                 if (!fgets(p = line, MAXLINELENGTH, tf))
 102                         return (NULL);
 103                 /* skip lines that are too big */
 104                 if (!index(p, '\n')) {
 105                         while ((c = getc(tf)) != '\n' && c != EOF)
 106                                 ;
 107                         continue;
 108                 }
 109                 while (isspace(*p))
 110                         ++p;
 111                 if (*p && *p != '#')
 112                         break;
 113         }
 114
 115         zapchar = 0;
 116         tty.ty_name = p;
 117         p = skip(p);
 118         if (!*(tty.ty_getty = p))
 119                 tty.ty_getty = tty.ty_type = NULL;
 120         else {
 121                 p = skip(p);
 122                 if (!*(tty.ty_type = p))
 123                         tty.ty_type = NULL;
 124                 else
 125                         p = skip(p);
 126         }
 127         tty.ty_status = 0;
 128         tty.ty_window = NULL;
 129         tty.ty_onerror = NULL;
 130         tty.ty_onoption = NULL;
 131
 132 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
 133 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 134         for (; *p; p = skip(p)) {
 135                 if (scmp(_TTYS_OFF))
 136                         tty.ty_status &= ~TTY_ON;
 137                 else if (scmp(_TTYS_ON))
 138                         tty.ty_status |= TTY_ON;
 139                 else if (scmp(_TTYS_SECURE))
 140                         tty.ty_status |= TTY_SECURE;
 141                 else if (vcmp(_TTYS_WINDOW))
 142                         tty.ty_window = value(p);
 143                 else if (vcmp(_TTYS_ONERROR))
 144                         tty.ty_onerror = value(p);
 145                 else if (vcmp(_TTYS_ONOPTION))
 146                         tty.ty_onoption = value(p);
 147                 else
 148                         break;
 149         }
 150
 151         if (zapchar == '#' || *p == '#')
 152                 while ((c = *++p) == ' ' || c == '\t')
 153                         ;
 154         tty.ty_comment = p;
 155         if (*p == 0)
 156                 tty.ty_comment = 0;
 157         if (p = index(p, '\n'))
 158                 *p = '\0';
 159         return (&tty);
 160 }
 161
 162 #define QUOTED  1
 163
 164 /*
 165  * Skip over the current field, removing quotes, and return a pointer to
 166  * the next field.
 167  */
 168 static char *
 169 skip(p)
 170         register char *p;
 171 {
 172         register char *t;
 173         register int c, q;
 174
 175         for (q = 0, t = p; (c = *p) != '\0'; p++) {
 176                 if (c == '"') {
 177                         q ^= QUOTED;    /* obscure, but nice */
 178                         continue;
 179                 }
 180                 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
 181                         p++;
 182                 *t++ = *p;
 183                 if (q == QUOTED)
 184                         continue;
 185                 if (c == '#') {
 186                         zapchar = c;
 187                         *p = 0;
 188                         break;
 189                 }
 190                 if (c == '\t' || c == ' ' || c == '\n') {
 191                         zapchar = c;
 192                         *p++ = 0;
 193                         while ((c = *p) == '\t' || c == ' ' || c == '\n')
 194                                 p++;
 195                         break;
 196                 }
 197         }
 198         *--t = '\0';
 199         return (p);
 200 }
 201
 202 static char *
 203 value(p)
 204         register char *p;
 205 {
 206
 207         return ((p = index(p, '=')) ? ++p : NULL);
 208 }
 209
 210 int
 211 setttyent()
 212 {
 213
 214         if (tf) {
 215                 (void)rewind(tf);
 216                 return (1);
 217         } else if (tf = fopen(_PATH_TTYS, "r"))
 218                 return (1);
 219         return (0);
 220 }
 221
 222 int
 223 endttyent()
 224 {
 225         int rval;
 226
 227         if (tf) {
 228                 rval = !(fclose(tf) == EOF);
 229                 tf = NULL;
 230                 return (rval);
 231         }
 232         return (1);
 233 }