1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)getttyent.c 5.7 (Berkeley) 05/15/90"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <ttyent.h> 23 #include <stdio.h> 24 #include <ctype.h> 25 #include <string.h> 26 27 static char zapchar; 28 static FILE *tf; 29 30 struct ttyent * 31 getttynam(tty) 32 char *tty; 33 { 34 register struct ttyent *t; 35 36 setttyent(); 37 while (t = getttyent()) 38 if (!strcmp(tty, t->ty_name)) 39 break; 40 return(t); 41 } 42 43 struct ttyent * 44 getttyent() 45 { 46 static struct ttyent tty; 47 register int c; 48 register char *p; 49 #define MAXLINELENGTH 100 50 static char line[MAXLINELENGTH]; 51 char *skip(), *value(); 52 53 if (!tf && !setttyent()) 54 return(NULL); 55 for (;;) { 56 if (!fgets(p = line, sizeof(line), tf)) 57 return(NULL); 58 /* skip lines that are too big */ 59 if (!index(p, '\n')) { 60 while ((c = getc(tf)) != '\n' && c != EOF) 61 ; 62 continue; 63 } 64 while (isspace(*p)) 65 ++p; 66 if (*p && *p != '#') 67 break; 68 } 69 70 zapchar = 0; 71 tty.ty_name = p; 72 p = skip(p); 73 if (!*(tty.ty_getty = p)) 74 tty.ty_getty = tty.ty_type = NULL; 75 else { 76 p = skip(p); 77 if (!*(tty.ty_type = p)) 78 tty.ty_type = NULL; 79 else 80 p = skip(p); 81 } 82 tty.ty_status = 0; 83 tty.ty_window = NULL; 84 85 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 86 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 87 for (; *p; p = skip(p)) { 88 if (scmp(_TTYS_OFF)) 89 tty.ty_status &= ~TTY_ON; 90 else if (scmp(_TTYS_ON)) 91 tty.ty_status |= TTY_ON; 92 else if (scmp(_TTYS_SECURE)) 93 tty.ty_status |= TTY_SECURE; 94 else if (vcmp(_TTYS_WINDOW)) 95 tty.ty_window = value(p); 96 else 97 break; 98 } 99 100 if (zapchar == '#' || *p == '#') 101 while ((c = *++p) == ' ' || c == '\t') 102 ; 103 tty.ty_comment = p; 104 if (*p == 0) 105 tty.ty_comment = 0; 106 if (p = index(p, '\n')) 107 *p = '\0'; 108 return(&tty); 109 } 110 111 #define QUOTED 1 112 113 /* 114 * Skip over the current field, removing quotes, and return a pointer to 115 * the next field. 116 */ 117 static char * 118 skip(p) 119 register char *p; 120 { 121 register char *t; 122 register int c, q; 123 124 for (q = 0, t = p; (c = *p) != '\0'; p++) { 125 if (c == '"') { 126 q ^= QUOTED; /* obscure, but nice */ 127 continue; 128 } 129 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 130 p++; 131 *t++ = *p; 132 if (q == QUOTED) 133 continue; 134 if (c == '#') { 135 zapchar = c; 136 *p = 0; 137 break; 138 } 139 if (c == '\t' || c == ' ' || c == '\n') { 140 zapchar = c; 141 *p++ = 0; 142 while ((c = *p) == '\t' || c == ' ' || c == '\n') 143 p++; 144 break; 145 } 146 } 147 *--t = '\0'; 148 return(p); 149 } 150 151 static char * 152 value(p) 153 register char *p; 154 { 155 return((p = index(p, '=')) ? ++p : NULL); 156 } 157 158 setttyent() 159 { 160 if (tf) { 161 (void)rewind(tf); 162 return(1); 163 } else if (tf = fopen(_PATH_TTYS, "r")) 164 return(1); 165 return(0); 166 } 167 168 endttyent() 169 { 170 int rval; 171 172 if (tf) { 173 rval = !(fclose(tf) == EOF); 174 tf = NULL; 175 return(rval); 176 } 177 return(1); 178 } 179