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 5.5 (Berkeley) 09/19/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <ttyent.h> 23 #include <stdio.h> 24 #include <ctype.h> 25 #include <strings.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 do { 56 if (!fgets(line, sizeof(line), tf)) 57 return(NULL); 58 /* skip lines that are too big */ 59 if (!index(line, '\n')) { 60 while ((c = getc(tf)) != '\n' && c != EOF) 61 ; 62 continue; 63 } 64 for (p = line; isspace(*p); ++p) 65 ; 66 } while (!*p || *p == '#'); 67 68 zapchar = 0; 69 tty.ty_name = p; 70 p = skip(p); 71 if (!*(tty.ty_getty = p)) 72 tty.ty_getty = tty.ty_type = NULL; 73 else { 74 p = skip(p); 75 if (!*(tty.ty_type = p)) 76 tty.ty_type = NULL; 77 else 78 p = skip(p); 79 } 80 tty.ty_status = 0; 81 tty.ty_window = NULL; 82 83 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1]) 84 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 85 for (; *p; p = skip(p)) { 86 if (scmp(_TTYS_OFF)) 87 tty.ty_status &= ~TTY_ON; 88 else if (scmp(_TTYS_ON)) 89 tty.ty_status |= TTY_ON; 90 else if (scmp(_TTYS_SECURE)) 91 tty.ty_status |= TTY_SECURE; 92 else if (vcmp(_TTYS_WINDOW)) 93 tty.ty_window = value(p); 94 else 95 break; 96 } 97 98 if (zapchar == '#' || *p == '#') 99 while ((c = *++p) == ' ' || c == '\t') 100 ; 101 tty.ty_comment = p; 102 if (*p == 0) 103 tty.ty_comment = 0; 104 if (p = index(p, '\n')) 105 *p = '\0'; 106 return(&tty); 107 } 108 109 #define QUOTED 1 110 111 /* 112 * Skip over the current field, removing quotes, and return a pointer to 113 * the next field. 114 */ 115 static char * 116 skip(p) 117 register char *p; 118 { 119 register char *t; 120 register int c, q; 121 122 for (q = 0, t = p; (c = *p) != '\0'; p++) { 123 if (c == '"') { 124 q ^= QUOTED; /* obscure, but nice */ 125 continue; 126 } 127 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 128 p++; 129 *t++ = *p; 130 if (q == QUOTED) 131 continue; 132 if (c == '#') { 133 zapchar = c; 134 *p = 0; 135 break; 136 } 137 if (c == '\t' || c == ' ' || c == '\n') { 138 zapchar = c; 139 *p++ = 0; 140 while ((c = *p) == '\t' || c == ' ' || c == '\n') 141 p++; 142 break; 143 } 144 } 145 *--t = '\0'; 146 return(p); 147 } 148 149 static char * 150 value(p) 151 register char *p; 152 { 153 return((p = index(p, '=')) ? ++p : NULL); 154 } 155 156 setttyent() 157 { 158 if (tf) { 159 (void)rewind(tf); 160 return(1); 161 } else if (tf = fopen(_PATH_TTYS, "r")) 162 return(1); 163 return(0); 164 } 165 166 endttyent() 167 { 168 int rval; 169 170 if (tf) { 171 rval = !(fclose(tf) == EOF); 172 tf = NULL; 173 return(rval); 174 } 175 return(1); 176 } 177