gen.subproj/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
  61 static char zapchar;
  62 static FILE *tf;
  63
  64 struct ttyent *
  65 getttynam(tty)
  66         const char *tty;
  67 {
  68         register struct ttyent *t;
  69
  70         setttyent();
  71         while (t = getttyent())
  72                 if (!strcmp(tty, t->ty_name))
  73                         break;
  74         endttyent();
  75         return (t);
  76 }
  77
  78 struct ttyent *
  79 getttyent()
  80 {
  81         static struct ttyent tty;
  82         register int c;
  83         register char *p;
  84 #define MAXLINELENGTH   1024
  85         static char line[MAXLINELENGTH];
  86         static char *skip(), *value();
  87
  88         if (!tf && !setttyent())
  89                 return (NULL);
  90         for (;;) {
  91                 if (!fgets(p = line, sizeof(line), tf))
  92                         return (NULL);
  93                 /* skip lines that are too big */
  94                 if (!index(p, '\n')) {
  95                         while ((c = getc(tf)) != '\n' && c != EOF)
  96                                 ;
  97                         continue;
  98                 }
  99                 while (isspace(*p))
 100                         ++p;
 101                 if (*p && *p != '#')
 102                         break;
 103         }
 104
 105         zapchar = 0;
 106         tty.ty_name = p;
 107         p = skip(p);
 108         if (!*(tty.ty_getty = p))
 109                 tty.ty_getty = tty.ty_type = NULL;
 110         else {
 111                 p = skip(p);
 112                 if (!*(tty.ty_type = p))
 113                         tty.ty_type = NULL;
 114                 else
 115                         p = skip(p);
 116         }
 117         tty.ty_status = 0;
 118         tty.ty_window = NULL;
 119         tty.ty_onerror = NULL;
 120         tty.ty_onoption = NULL;
 121
 122 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
 123 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 124         for (; *p; p = skip(p)) {
 125                 if (scmp(_TTYS_OFF))
 126                         tty.ty_status &= ~TTY_ON;
 127                 else if (scmp(_TTYS_ON))
 128                         tty.ty_status |= TTY_ON;
 129                 else if (scmp(_TTYS_SECURE))
 130                         tty.ty_status |= TTY_SECURE;
 131                 else if (vcmp(_TTYS_WINDOW))
 132                         tty.ty_window = value(p);
 133                 else if (vcmp(_TTYS_ONERROR))
 134                         tty.ty_onerror = value(p);
 135                 else if (vcmp(_TTYS_ONOPTION))
 136                         tty.ty_onoption = value(p);
 137                 else
 138                         break;
 139         }
 140
 141         if (zapchar == '#' || *p == '#')
 142                 while ((c = *++p) == ' ' || c == '\t')
 143                         ;
 144         tty.ty_comment = p;
 145         if (*p == 0)
 146                 tty.ty_comment = 0;
 147         if (p = index(p, '\n'))
 148                 *p = '\0';
 149         return (&tty);
 150 }
 151
 152 #define QUOTED  1
 153
 154 /*
 155  * Skip over the current field, removing quotes, and return a pointer to
 156  * the next field.
 157  */
 158 static char *
 159 skip(p)
 160         register char *p;
 161 {
 162         register char *t;
 163         register int c, q;
 164
 165         for (q = 0, t = p; (c = *p) != '\0'; p++) {
 166                 if (c == '"') {
 167                         q ^= QUOTED;    /* obscure, but nice */
 168                         continue;
 169                 }
 170                 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
 171                         p++;
 172                 *t++ = *p;
 173                 if (q == QUOTED)
 174                         continue;
 175                 if (c == '#') {
 176                         zapchar = c;
 177                         *p = 0;
 178                         break;
 179                 }
 180                 if (c == '\t' || c == ' ' || c == '\n') {
 181                         zapchar = c;
 182                         *p++ = 0;
 183                         while ((c = *p) == '\t' || c == ' ' || c == '\n')
 184                                 p++;
 185                         break;
 186                 }
 187         }
 188         *--t = '\0';
 189         return (p);
 190 }
 191
 192 static char *
 193 value(p)
 194         register char *p;
 195 {
 196
 197         return ((p = index(p, '=')) ? ++p : NULL);
 198 }
 199
 200 int
 201 setttyent()
 202 {
 203
 204         if (tf) {
 205                 (void)rewind(tf);
 206                 return (1);
 207         } else if (tf = fopen(_PATH_TTYS, "r"))
 208                 return (1);
 209         return (0);
 210 }
 211
 212 int
 213 endttyent()
 214 {
 215         int rval;
 216
 217         if (tf) {
 218                 rval = !(fclose(tf) == EOF);
 219                 tf = NULL;
 220                 return (rval);
 221         }
 222         return (1);
 223 }