1 /* 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 #ifndef lint 22 static char rcsid[] = 23 "@(#) $Header: etherent.c,v 1.2 90/09/20 23:16:06 mccanne Exp $ (LBL)"; 24 #endif 25 26 #include <stdio.h> 27 #include <ctype.h> 28 #include <sys/types.h> 29 #include "interface.h" 30 31 #ifndef ETHER_SERVICE 32 33 #include "etherent.h" 34 35 /* Hex digit to integer. */ 36 static inline int 37 xdtoi(c) 38 { 39 if (isdigit(c)) 40 return c - '0'; 41 else if (islower(c)) 42 return c - 'a' + 10; 43 else 44 return c - 'A' + 10; 45 } 46 47 static inline int 48 skip_space(f) 49 FILE *f; 50 { 51 int c; 52 53 do { 54 c = getc(f); 55 } while (isspace(c) && c != '\n'); 56 57 return c; 58 } 59 60 static inline int 61 skip_line(f) 62 FILE *f; 63 { 64 int c; 65 66 do 67 c = getc(f); 68 while (c != '\n' && c != EOF); 69 70 return c; 71 } 72 73 struct etherent * 74 next_etherent(fp) 75 FILE *fp; 76 { 77 register int c, d, i; 78 char *bp; 79 static struct etherent e; 80 static int nline = 1; 81 top: 82 while (nline) { 83 /* Find addr */ 84 c = skip_space(fp); 85 if (c == '\n') 86 continue; 87 /* If this is a comment, or first thing on line 88 cannot be etehrnet address, skip the line. */ 89 else if (!isxdigit(c)) 90 c = skip_line(fp); 91 else { 92 /* must be the start of an address */ 93 for (i = 0; i < 6; i += 1) { 94 d = xdtoi(c); 95 c = getc(fp); 96 if (c != ':') { 97 d <<= 4; 98 d |= xdtoi(c); 99 c = getc(fp); 100 } 101 e.addr[i] = d; 102 if (c != ':') 103 break; 104 c = getc(fp); 105 } 106 nline = 0; 107 } 108 if (c == EOF) 109 return 0; 110 } 111 112 /* If we started a new line, 'c' holds the char past the ether addr, 113 which we assume is white space. If we are continuning a line, 114 'c' is garbage. In either case, we can throw it away. */ 115 116 c = skip_space(fp); 117 if (c == '\n') { 118 nline = 1; 119 goto top; 120 } 121 else if (c == '#') { 122 (void)skip_line(fp); 123 nline = 1; 124 goto top; 125 } 126 else if (c == EOF) 127 return 0; 128 129 /* Must be a name. */ 130 bp = e.name; 131 /* Use 'd' to prevent buffer overflow. */ 132 d = sizeof(e.name) - 1; 133 do { 134 *bp++ = c; 135 c = getc(fp); 136 } while (!isspace(c) && c != EOF && --d > 0); 137 *bp = '\0'; 138 if (c == '\n') 139 nline = 1; 140 141 return &e; 142 } 143 144 #endif 145