1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <ttyent.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <ctype.h> 42 #include <string.h> 43 44 static char zapchar; 45 static FILE *tf; 46 static size_t lbsize; 47 static char *line; 48 49 #define MALLOCCHUNK 100 50 51 static char *skip __P((char *)); 52 static char *value __P((char *)); 53 54 struct ttyent * 55 getttynam(tty) 56 const char *tty; 57 { 58 register struct ttyent *t; 59 60 setttyent(); 61 while ( (t = getttyent()) ) 62 if (!strcmp(tty, t->ty_name)) 63 break; 64 endttyent(); 65 return (t); 66 } 67 68 struct ttyent * 69 getttyent() 70 { 71 static struct ttyent tty; 72 register char *p; 73 register int c; 74 size_t i; 75 76 if (!tf && !setttyent()) 77 return (NULL); 78 for (;;) { 79 if (!fgets(p = line, lbsize, tf)) 80 return (NULL); 81 /* extend buffer if line was too big, and retry */ 82 while (!index(p, '\n')) { 83 i = strlen(p); 84 lbsize += MALLOCCHUNK; 85 if ((p = realloc(line, lbsize)) == NULL) { 86 (void)endttyent(); 87 return (NULL); 88 } 89 line = p; 90 if (!fgets(&line[i], lbsize - i, tf)) 91 return (NULL); 92 } 93 while (isspace(*p)) 94 ++p; 95 if (*p && *p != '#') 96 break; 97 } 98 99 zapchar = 0; 100 tty.ty_name = p; 101 p = skip(p); 102 if (!*(tty.ty_getty = p)) 103 tty.ty_getty = tty.ty_type = NULL; 104 else { 105 p = skip(p); 106 if (!*(tty.ty_type = p)) 107 tty.ty_type = NULL; 108 else 109 p = skip(p); 110 } 111 tty.ty_status = 0; 112 tty.ty_window = NULL; 113 tty.ty_group = _TTYS_NOGROUP; 114 115 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 116 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 117 for (; *p; p = skip(p)) { 118 if (scmp(_TTYS_OFF)) 119 tty.ty_status &= ~TTY_ON; 120 else if (scmp(_TTYS_ON)) 121 tty.ty_status |= TTY_ON; 122 else if (scmp(_TTYS_SECURE)) 123 tty.ty_status |= TTY_SECURE; 124 else if (vcmp(_TTYS_WINDOW)) 125 tty.ty_window = value(p); 126 else if (vcmp(_TTYS_GROUP)) 127 tty.ty_group = value(p); 128 else 129 break; 130 } 131 132 if (zapchar == '#' || *p == '#') 133 while ((c = *++p) == ' ' || c == '\t') 134 ; 135 tty.ty_comment = p; 136 if (*p == 0) 137 tty.ty_comment = 0; 138 if ( (p = index(p, '\n')) ) 139 *p = '\0'; 140 return (&tty); 141 } 142 143 #define QUOTED 1 144 145 /* 146 * Skip over the current field, removing quotes, and return a pointer to 147 * the next field. 148 */ 149 static char * 150 skip(p) 151 register char *p; 152 { 153 register char *t; 154 register int c, q; 155 156 for (q = 0, t = p; (c = *p) != '\0'; p++) { 157 if (c == '"') { 158 q ^= QUOTED; /* obscure, but nice */ 159 continue; 160 } 161 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 162 p++; 163 *t++ = *p; 164 if (q == QUOTED) 165 continue; 166 if (c == '#') { 167 zapchar = c; 168 *p = 0; 169 break; 170 } 171 if (c == '\t' || c == ' ' || c == '\n') { 172 zapchar = c; 173 *p++ = 0; 174 while ((c = *p) == '\t' || c == ' ' || c == '\n') 175 p++; 176 break; 177 } 178 } 179 *--t = '\0'; 180 return (p); 181 } 182 183 static char * 184 value(p) 185 register char *p; 186 { 187 188 return ((p = index(p, '=')) ? ++p : NULL); 189 } 190 191 int 192 setttyent() 193 { 194 195 if (line == NULL) { 196 if ((line = malloc(MALLOCCHUNK)) == NULL) 197 return (0); 198 lbsize = MALLOCCHUNK; 199 } 200 if (tf) { 201 rewind(tf); 202 return (1); 203 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 204 return (1); 205 return (0); 206 } 207 208 int 209 endttyent() 210 { 211 int rval; 212 213 /* 214 * NB: Don't free `line' because getttynam() 215 * may still be referencing it 216 */ 217 if (tf) { 218 rval = (fclose(tf) != EOF); 219 tf = NULL; 220 return (rval); 221 } 222 return (1); 223 } 224