getttyent.c revision 1.25
1 /* $NetBSD: getttyent.c,v 1.25 2013/06/30 07:50:54 matt 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 1.25 2013/06/30 07:50:54 matt 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 #include <sys/sysctl.h> 53 #include <sys/utsname.h> 54 55 #ifdef __weak_alias 56 __weak_alias(endttyent,_endttyent) 57 __weak_alias(getttyent,_getttyent) 58 __weak_alias(getttynam,_getttynam) 59 __weak_alias(setttyent,_setttyent) 60 __weak_alias(setttyentpath,_setttyentpath) 61 #endif 62 63 static FILE *tf; 64 static size_t lineno = 0; 65 static char *skip(char *, char *); 66 static char *value(char *); 67 68 struct ttyent * 69 getttynam(const char *tty) 70 { 71 struct ttyent *t; 72 73 _DIAGASSERT(tty != NULL); 74 75 setttyent(); 76 while ((t = getttyent()) != NULL) 77 if (!strcmp(tty, t->ty_name)) 78 break; 79 endttyent(); 80 return (t); 81 } 82 83 struct ttyent * 84 getttyent(void) 85 { 86 static struct ttyent tty; 87 int c; 88 char *p; 89 size_t len; 90 static char *line = NULL; 91 char zapchar; 92 93 if (line) 94 free(line); 95 96 if (!tf && !setttyent()) 97 return NULL; 98 99 for (;;) { 100 errno = 0; 101 line = fparseln(tf, &len, &lineno, NULL, FPARSELN_UNESCALL); 102 if (line == NULL) { 103 if (errno != 0) 104 warn(__func__); 105 return NULL; 106 } 107 for (p = line; *p && isspace((unsigned char)*p); p++) 108 continue; 109 if (*p && *p != '#') 110 break; 111 free(line); 112 } 113 114 tty.ty_name = p; 115 p = skip(p, &zapchar); 116 if (*(tty.ty_getty = p) == '\0') 117 tty.ty_getty = tty.ty_type = NULL; 118 else { 119 p = skip(p, &zapchar); 120 if (*(tty.ty_type = p) == '\0') 121 tty.ty_type = NULL; 122 else 123 p = skip(p, &zapchar); 124 } 125 tty.ty_status = 0; 126 tty.ty_window = NULL; 127 tty.ty_class = NULL; 128 129 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && (isspace((unsigned char) p[sizeof(e) - 1]) || p[sizeof(e) - 1] == '\0') 130 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 131 for (; *p; p = skip(p, &zapchar)) { 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 (scmp(_TTYS_LOCAL)) 139 tty.ty_status |= TTY_LOCAL; 140 else if (scmp(_TTYS_RTSCTS)) 141 tty.ty_status |= TTY_RTSCTS; 142 else if (scmp(_TTYS_DTRCTS)) 143 tty.ty_status |= TTY_DTRCTS; 144 else if (scmp(_TTYS_SOFTCAR)) 145 tty.ty_status |= TTY_SOFTCAR; 146 else if (scmp(_TTYS_MDMBUF)) 147 tty.ty_status |= TTY_MDMBUF; 148 else if (vcmp(_TTYS_WINDOW)) 149 tty.ty_window = value(p); 150 else if (vcmp(_TTYS_CLASS)) 151 tty.ty_class = value(p); 152 else 153 warnx("%s: %s, %lu: unknown option `%s'", 154 __func__, _PATH_TTYS, (unsigned long)lineno, p); 155 } 156 157 if (zapchar == '#' || *p == '#') 158 while ((c = *++p) == ' ' || c == '\t') 159 continue; 160 tty.ty_comment = p; 161 if (*p == '\0') 162 tty.ty_comment = NULL; 163 if ((p = strchr(p, '\n')) != NULL) 164 *p = '\0'; 165 return &tty; 166 } 167 168 #define QUOTED 1 169 170 /* 171 * Skip over the current field, removing quotes, and return a pointer to 172 * the next field. 173 */ 174 static char * 175 skip(char *p, char *zapchar) 176 { 177 char *t; 178 int c, q; 179 180 _DIAGASSERT(p != NULL); 181 *zapchar = '\0'; 182 183 for (q = 0, t = p; (c = *p) != '\0'; p++) { 184 if (c == '"') { 185 q ^= QUOTED; /* obscure, but nice */ 186 continue; 187 } 188 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 189 p++; 190 *t++ = *p; 191 if (q == QUOTED) 192 continue; 193 if (c == '#') { 194 *zapchar = c; 195 *p = '\0'; 196 *--t = '\0'; 197 return p; 198 } 199 if (c == '\t' || c == ' ' || c == '\n') { 200 *zapchar = c; 201 *p++ = '\0'; 202 while ((c = *p) == '\t' || c == ' ' || c == '\n') 203 p++; 204 *--t = '\0'; 205 return p; 206 } 207 } 208 if (t != p) 209 *t = '\0'; 210 return p; 211 } 212 213 static char * 214 value(char *p) 215 { 216 217 _DIAGASSERT(p != NULL); 218 219 return (p = strchr(p, '=')) != NULL ? ++p : NULL; 220 } 221 222 int 223 setttyentpath(const char *path) 224 { 225 lineno = 0; 226 if (tf) { 227 rewind(tf); 228 return 1; 229 } 230 231 /* 232 * Try <path>.$MACHINE (e.g. etc/ttys.amd64) 233 */ 234 char machine[_SYS_NMLN]; 235 const int mib[] = { [0] = CTL_HW, [1] = HW_MACHINE, }; 236 size_t len = sizeof(machine); 237 238 if (sysctl(mib, __arraycount(mib), machine, &len, NULL, 0) != -1) { 239 char npath[PATH_MAX]; 240 (void)snprintf(npath, sizeof(npath), "%s.%s", path, machine); 241 if ((tf = fopen(npath, "re")) != NULL) 242 return 1; 243 } 244 245 if ((tf = fopen(path, "re")) != NULL) 246 return 1; 247 return 0; 248 } 249 250 int 251 setttyent(void) 252 { 253 return setttyentpath(_PATH_TTYS); 254 } 255 256 int 257 endttyent(void) 258 { 259 int rval; 260 261 if (tf) { 262 rval = !(fclose(tf) == EOF); 263 tf = NULL; 264 return rval; 265 } 266 return 1; 267 } 268
Indexes created Thu Sep 25 08:09:54 GMT 2025