gen/getttyent.c

   1 /*
   2  * Copyright (c) 1999 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
  64 static char zapchar;
  65 static FILE *tf;
  66
  67 struct ttyent *
  68 getttynam(tty)
  69         const char *tty;
  70 {
  71         register struct ttyent *t;
  72
  73         setttyent();
  74         while (t = getttyent())
  75                 if (!strcmp(tty, t->ty_name))
  76                         break;
  77         endttyent();
  78         return (t);
  79 }
  80
  81 static char *skip(), *value();
  82
  83 struct ttyent *
  84 getttyent()
  85 {
  86         static struct ttyent tty;
  87         register int c;
  88         register char *p;
  89 #define MAXLINELENGTH   1024
  90         static char *line = NULL;
  91         locale_t loc = __current_locale();
  92
  93         if ( line == NULL ) {
  94                 line = malloc(MAXLINELENGTH);
  95                 if( line == NULL )
  96                         return NULL;
  97         }
  98
  99         if (!tf && !setttyent())
 100                 return (NULL);
 101         for (;;) {
 102                 if (!fgets(p = line, MAXLINELENGTH, tf))
 103                         return (NULL);
 104                 /* skip lines that are too big */
 105                 if (!index(p, '\n')) {
 106                         while ((c = getc(tf)) != '\n' && c != EOF)
 107                                 ;
 108                         continue;
 109                 }
 110                 while (isspace_l(*p, loc))
 111                         ++p;
 112                 if (*p && *p != '#')
 113                         break;
 114         }
 115
 116         zapchar = 0;
 117         tty.ty_name = p;
 118         p = skip(p);
 119         if (!*(tty.ty_getty = p))
 120                 tty.ty_getty = tty.ty_type = NULL;
 121         else {
 122                 p = skip(p);
 123                 if (!*(tty.ty_type = p))
 124                         tty.ty_type = NULL;
 125                 else
 126                         p = skip(p);
 127         }
 128         tty.ty_status = 0;
 129         tty.ty_window = NULL;
 130         tty.ty_onerror = NULL;
 131         tty.ty_onoption = NULL;
 132
 133 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace_l(p[sizeof(e) - 1], loc)
 134 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 135         for (; *p; p = skip(p)) {
 136                 if (scmp(_TTYS_OFF))
 137                         tty.ty_status &= ~TTY_ON;
 138                 else if (scmp(_TTYS_ON))
 139                         tty.ty_status |= TTY_ON;
 140                 else if (scmp(_TTYS_SECURE))
 141                         tty.ty_status |= TTY_SECURE;
 142                 else if (vcmp(_TTYS_WINDOW))
 143                         tty.ty_window = value(p);
 144                 else if (vcmp(_TTYS_ONERROR))
 145                         tty.ty_onerror = value(p);
 146                 else if (vcmp(_TTYS_ONOPTION))
 147                         tty.ty_onoption = value(p);
 148                 else
 149                         break;
 150         }
 151
 152         if (zapchar == '#' || *p == '#')
 153                 while ((c = *++p) == ' ' || c == '\t')
 154                         ;
 155         tty.ty_comment = p;
 156         if (*p == 0)
 157                 tty.ty_comment = 0;
 158         if (p = index(p, '\n'))
 159                 *p = '\0';
 160         return (&tty);
 161 }
 162
 163 #define QUOTED  1
 164
 165 /*
 166  * Skip over the current field, removing quotes, and return a pointer to
 167  * the next field.
 168  */
 169 static char *
 170 skip(p)
 171         register char *p;
 172 {
 173         register char *t;
 174         register int c, q;
 175
 176         for (q = 0, t = p; (c = *p) != '\0'; p++) {
 177                 if (c == '"') {
 178                         q ^= QUOTED;    /* obscure, but nice */
 179                         continue;
 180                 }
 181                 if (q == QUOTED && *p == '\\' && *(p+1) == '"')
 182                         p++;
 183                 *t++ = *p;
 184                 if (q == QUOTED)
 185                         continue;
 186                 if (c == '#') {
 187                         zapchar = c;
 188                         *p = 0;
 189                         break;
 190                 }
 191                 if (c == '\t' || c == ' ' || c == '\n') {
 192                         zapchar = c;
 193                         *p++ = 0;
 194                         while ((c = *p) == '\t' || c == ' ' || c == '\n')
 195                                 p++;
 196                         break;
 197                 }
 198         }
 199         *--t = '\0';
 200         return (p);
 201 }
 202
 203 static char *
 204 value(p)
 205         register char *p;
 206 {
 207
 208         return ((p = index(p, '=')) ? ++p : NULL);
 209 }
 210
 211 int
 212 setttyent()
 213 {
 214
 215         if (tf) {
 216                 (void)rewind(tf);
 217                 return (1);
 218         } else if (tf = fopen(_PATH_TTYS, "r"))
 219                 return (1);
 220         return (0);
 221 }
 222
 223 int
 224 endttyent()
 225 {
 226         int rval;
 227
 228         if (tf) {
 229                 rval = !(fclose(tf) == EOF);
 230                 tf = NULL;
 231                 return (rval);
 232         }
 233         return (1);
 234 }