getttyent.c revision 1.20
1 /* $NetBSD: getttyent.c,v 1.20 2003/08/07 16:42:51 agc 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 1.20 2003/08/07 16:42:51 agc 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 char zapchar; 60 static FILE *tf; 61 static size_t lineno = 0; 62 static char *skip __P((char *)); 63 static char *value __P((char *)); 64 65 struct ttyent * 66 getttynam(tty) 67 const char *tty; 68 { 69 struct ttyent *t; 70 71 _DIAGASSERT(tty != NULL); 72 73 setttyent(); 74 while ((t = getttyent()) != NULL) 75 if (!strcmp(tty, t->ty_name)) 76 break; 77 endttyent(); 78 return (t); 79 } 80 81 struct ttyent * 82 getttyent() 83 { 84 static struct ttyent tty; 85 int c; 86 char *p; 87 size_t len; 88 static char *line = NULL; 89 90 if (!tf && !setttyent()) 91 return (NULL); 92 if (line) 93 free(line); 94 for (;;) { 95 errno = 0; 96 line = fparseln(tf, &len, &lineno, NULL, FPARSELN_UNESCALL); 97 if (line == NULL) { 98 if (errno != 0) 99 warn("gettyent"); 100 return NULL; 101 } 102 for (p = line; *p && isspace((unsigned char) *p); p++) 103 continue; 104 if (*p && *p != '#') 105 break; 106 free(line); 107 } 108 109 zapchar = 0; 110 tty.ty_name = p; 111 p = skip(p); 112 if (!*(tty.ty_getty = p)) 113 tty.ty_getty = tty.ty_type = NULL; 114 else { 115 p = skip(p); 116 if (!*(tty.ty_type = p)) 117 tty.ty_type = NULL; 118 else 119 p = skip(p); 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)) { 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("gettyent: %s, %lu: unknown option `%s'", 149 _PATH_TTYS, (unsigned long)lineno, p); 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 = 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(p) 171 char *p; 172 { 173 char *t; 174 int c, q; 175 176 _DIAGASSERT(p != NULL); 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 break; 192 } 193 if (c == '\t' || c == ' ' || c == '\n') { 194 zapchar = c; 195 *p++ = 0; 196 while ((c = *p) == '\t' || c == ' ' || c == '\n') 197 p++; 198 break; 199 } 200 } 201 *--t = '\0'; 202 return (p); 203 } 204 205 static char * 206 value(p) 207 char *p; 208 { 209 210 _DIAGASSERT(p != NULL); 211 212 return ((p = strchr(p, '=')) ? ++p : NULL); 213 } 214 215 int 216 setttyent() 217 { 218 lineno = 0; 219 if (tf) { 220 rewind(tf); 221 return (1); 222 } else if ((tf = fopen(_PATH_TTYS, "r")) != NULL) 223 return (1); 224 return (0); 225 } 226 227 int 228 endttyent() 229 { 230 int rval; 231 232 if (tf) { 233 rval = !(fclose(tf) == EOF); 234 tf = NULL; 235 return (rval); 236 } 237 return (1); 238 } 239
Indexes created Mon Sep 29 21:09:56 GMT 2025