1 /* $NetBSD: getttyent.c,v 1.21 2004/11/10 23:59:06 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: getttyent.c,v 1.21 2004/11/10 23:59:06 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <ctype.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <ttyent.h> 48 #include <errno.h> 49 #include <err.h> 50 #include <stdlib.h> 51 52 #ifdef __weak_alias 53 __weak_alias(endttyent,_endttyent) 54 __weak_alias(getttyent,_getttyent) 55 __weak_alias(getttynam,_getttynam) 56 __weak_alias(setttyent,_setttyent) 57 #endif 58 59 static FILE *tf; 60 static size_t lineno = 0; 61 static char *skip(char *, char *); 62 static char *value(char *); 63 64 struct ttyent * 65 getttynam(const char *tty) 66 { 67 struct ttyent *t; 68 69 _DIAGASSERT(tty != NULL); 70 71 setttyent(); 72 while ((t = getttyent()) != NULL) 73 if (!strcmp(tty, t->ty_name)) 74 break; 75 endttyent(); 76 return (t); 77 } 78 79 struct ttyent * 80 getttyent(void) 81 { 82 static struct ttyent tty; 83 int c; 84 char *p; 85 size_t len; 86 static char *line = NULL; 87 char zapchar; 88 89 if (line) 90 free(line); 91 92 if (!tf && !setttyent()) 93 return NULL; 94 95 for (;;) { 96 errno = 0; 97 line = fparseln(tf, &len, &lineno, NULL, FPARSELN_UNESCALL); 98 if (line == NULL) { 99 if (errno != 0) 100 warn(__func__); 101 return NULL; 102 } 103 for (p = line; *p && isspace((unsigned char)*p); p++) 104 continue; 105 if (*p && *p != '#') 106 break; 107 free(line); 108 } 109 110 tty.ty_name = p; 111 p = skip(p, &zapchar); 112 if (*(tty.ty_getty = p) == '\0') 113 tty.ty_getty = tty.ty_type = NULL; 114 else { 115 p = skip(p, &zapchar); 116 if (*(tty.ty_type = p) == '\0') 117 tty.ty_type = NULL; 118 else 119 p = skip(p, &zapchar); 120 } 121 tty.ty_status = 0; 122 tty.ty_window = NULL; 123 124 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && (isspace((unsigned char) p[sizeof(e) - 1]) || p[sizeof(e) - 1] == '\0') 125 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 126 for (; *p; p = skip(p, &zapchar)) { 127 if (scmp(_TTYS_OFF)) 128 tty.ty_status &= ~TTY_ON; 129 else if (scmp(_TTYS_ON)) 130 tty.ty_status |= TTY_ON; 131 else if (scmp(_TTYS_SECURE)) 132 tty.ty_status |= TTY_SECURE; 133 else if (scmp(_TTYS_LOCAL)) 134 tty.ty_status |= TTY_LOCAL; 135 else if (scmp(_TTYS_RTSCTS)) 136 tty.ty_status |= TTY_RTSCTS; 137 else if (scmp(_TTYS_DTRCTS)) 138 tty.ty_status |= TTY_DTRCTS; 139 else if (scmp(_TTYS_SOFTCAR)) 140 tty.ty_status |= TTY_SOFTCAR; 141 else if (scmp(_TTYS_MDMBUF)) 142 tty.ty_status |= TTY_MDMBUF; 143 else if (vcmp(_TTYS_WINDOW)) 144 tty.ty_window = value(p); 145 else if (vcmp(_TTYS_CLASS)) 146 tty.ty_class = value(p); 147 else 148 warnx("%s: %s, %lu: unknown option `%s'", 149 __func__, _PATH_TTYS, (unsigned long)lineno, p); 150 } 151 152 if (zapchar == '#' || *p == '#') 153 while ((c = *++p) == ' ' || c == '\t') 154 continue; 155 tty.ty_comment = p; 156 if (*p == '\0') 157 tty.ty_comment = NULL; 158 if ((p = strchr(p, '\n')) != NULL) 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(char *p, char *zapchar) 171 { 172 char *t; 173 int c, q; 174 175 _DIAGASSERT(p != NULL); 176 *zapchar = '\0'; 177 178 for (q = 0, t = p; (c = *p) != '\0'; p++) { 179 if (c == '"') { 180 q ^= QUOTED; /* obscure, but nice */ 181 continue; 182 } 183 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 184 p++; 185 *t++ = *p; 186 if (q == QUOTED) 187 continue; 188 if (c == '#') { 189 *zapchar = c; 190 *p = '\0'; 191 *--t = '\0'; 192 return p; 193 } 194 if (c == '\t' || c == ' ' || c == '\n') { 195 *zapchar = c; 196 *p++ = '\0'; 197 while ((c = *p) == '\t' || c == ' ' || c == '\n') 198 p++; 199 *--t = '\0'; 200 return p; 201 } 202 } 203 if (t != p) 204 *t = '\0'; 205 return p; 206 } 207 208 static char * 209 value(char *p) 210 { 211 212 _DIAGASSERT(p != NULL); 213 214 return (p = strchr(p, '=')) != NULL ? ++p : NULL; 215 } 216 217 int 218 setttyent(void) 219 { 220 lineno = 0; 221 if (tf) { 222 rewind(tf); 223 return 1; 224 } else if ((tf = fopen(_PATH_TTYS, "r")) != NULL) 225 return 1; 226 return 0; 227 } 228 229 int 230 endttyent(void) 231 { 232 int rval; 233 234 if (tf) { 235 rval = !(fclose(tf) == EOF); 236 tf = NULL; 237 return rval; 238 } 239 return 1; 240 } 241