56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/*
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* Copyright (c) 1991 by Silicon Graphics, Inc.
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* Copyright (c) 1985 by Sun Microsystems, Inc.
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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/*
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* Filter to convert addresses in /etc/hosts file to standard form.
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*/
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main(argc, argv)
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char **argv;
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{
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char line[256];
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char adr[256];
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char *trailer;
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register char *cp;
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FILE *fp;
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if (argc > 1) {
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fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "stdhosts: can't open %s\n", argv[1]);
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exit(1);
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}
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}
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else
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fp = stdin;
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while (fgets(line, sizeof(line), fp)) {
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struct in_addr in;
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if ((cp = strpbrk(line, "#\n")) != NULL)
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*cp = '\0';
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if ((trailer = strpbrk(line, " \t")) == NULL)
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continue;
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sscanf(line, "%s", adr);
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if (inet_isaddr(adr, &in.s_addr)) {
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fputs(inet_ntoa(in), stdout);
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fputs(trailer, stdout);
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fputc('\n', stdout);
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} else {
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fprintf(stderr,
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"%s: Warning: ignoring invalid IP address '%s' for '%s'\n",
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argv[0], adr, trailer);
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}
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}
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exit(0);
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/* NOTREACHED */
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}
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