gen/getttyent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1989, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55
  56 #include <ttyent.h>
  57 #include <stdio.h>
  58 #include <ctype.h>
  59 #include <string.h>
  60 #include <stdlib.h>
  61
  62 static char zapchar;
  63 static FILE *tf;
  64
  65 struct ttyent *
  66 getttynam(tty)
  67         const char *tty;
  68 {
  69         register struct ttyent *t;
  70
  71         setttyent();
  72         while (t = getttyent())
  73                 if (!strcmp(tty, t->ty_name))
  74                         break;
  75         endttyent();
  76         return (t);
  77 }
  78
  79 struct ttyent *
  80 getttyent()
  81 {
  82         static struct ttyent tty;
  83         register int c;
  84         register char *p;
  85 #define MAXLINELENGTH   1024
  86         static char *line = NULL;
  87         static char *skip(), *value();
  88
  89         if ( line == NULL ) {
  90                 line = malloc(MAXLINELENGTH);
  91                 if( line == NULL )
  92                         return NULL;
  93         }
  94
  95         if (!tf && !setttyent())
  96                 return (NULL);
  97         for (;;) {
  98                 if (!fgets(p = line, MAXLINELENGTH, tf))
  99                         return (NULL);
 100                 /* skip lines that are too big */
 101                 if (!index(p, '\n')) {
 102                         while ((c = getc(tf)) != '\n' && c != EOF)
 103                                 ;
 104                         continue;
 105                 }
 106                 while (isspace(*p))
 107                         ++p;
 108                 if (*p && *p != '#')
 109                         break;
 110         }
 111
 112         zapchar = 0;
 113         tty.ty_name = p;
 114         p = skip(p);
 115         if (!*(tty.ty_getty = p))
 116                 tty.ty_getty = tty.ty_type = NULL;
 117         else {
 118                 p = skip(p);
 119                 if (!*(tty.ty_type = p))
 120                         tty.ty_type = NULL;
 121                 else
 122                         p = skip(p);
 123         }
 124         tty.ty_status = 0;
 125         tty.ty_window = NULL;
 126         tty.ty_onerror = NULL;
 127         tty.ty_onoption = NULL;
 128
 129 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
 130 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 131         for (; *p; p = skip(p)) {
 132                 if (scmp(_TTYS_OFF))
 133                         tty.ty_status &= ~TTY_ON;
 134                 else if (scmp(_TTYS_ON))
 135                         tty.ty_status |= TTY_ON;
 136                 else if (scmp(_TTYS_SECURE))
 137                         tty.ty_status |= TTY_SECURE;
 138                 else if (vcmp(_TTYS_WINDOW))
 139                         tty.ty_window = value(p);
 140                 else if (vcmp(_TTYS_ONERROR))
 141                         tty.ty_onerror = value(p);
 142                 else if (vcmp(_TTYS_ONOPTION))
 143                         tty.ty_onoption = value(p);
 144                 else
 145                         break;
 146         }
 147
 148         if (zapchar == '#' || *p == '#')
 149                 while ((c = *++p) == ' ' || c == '\t')
 150                         ;
 151         tty.ty_comment = p;
 152         if (*p == 0)
 153                 tty.ty_comment = 0;
 154         if (p = index(p, '\n'))
 155                 *p = '\0';
 156         return (&tty);
 157 }
 158
 159 #define QUOTED  1
 160
 161 /*
 162  * Skip over the current field, removing quotes, and return a pointer to
 163  * the next field.
 164  */
 165 static char *
 166 skip(p)
 167         register char *p;
 168 {
 169         register char *t;
 170         register int c, q;
 171
 172         for (q = 0, t = p; (c = *p) != '\0'; p++) {
 173                 if (c == '"') {
 174                         q ^= QUOTED;    /* obscure, but nice */
 175                         continue;
 176                 }
 177                 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
 178                         p++;
 179                 *t++ = *p;
 180                 if (q == QUOTED)
 181                         continue;
 182                 if (c == '#') {
 183                         zapchar = c;
 184                         *p = 0;
 185                         break;
 186                 }
 187                 if (c == '\t' || c == ' ' || c == '\n') {
 188                         zapchar = c;
 189                         *p++ = 0;
 190                         while ((c = *p) == '\t' || c == ' ' || c == '\n')
 191                                 p++;
 192                         break;
 193                 }
 194         }
 195         *--t = '\0';
 196         return (p);
 197 }
 198
 199 static char *
 200 value(p)
 201         register char *p;
 202 {
 203
 204         return ((p = index(p, '=')) ? ++p : NULL);
 205 }
 206
 207 int
 208 setttyent()
 209 {
 210
 211         if (tf) {
 212                 (void)rewind(tf);
 213                 return (1);
 214         } else if (tf = fopen(_PATH_TTYS, "r"))
 215                 return (1);
 216         return (0);
 217 }
 218
 219 int
 220 endttyent()
 221 {
 222         int rval;
 223
 224         if (tf) {
 225                 rval = !(fclose(tf) == EOF);
 226                 tf = NULL;
 227                 return (rval);
 228         }
 229         return (1);
 230 }