| 1 | /* Compute checksum Author: Johan W. Stevenson */
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| 2 |
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| 3 | /* Copyright 1988 by Johan W. Stevenson */
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| 4 |
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| 5 | #include <stdlib.h>
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| 6 | #include <string.h>
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| 7 | #include <stdio.h>
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| 8 | #include <string.h>
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| 9 | #include <errno.h>
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| 10 |
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| 11 | int errs;
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| 12 |
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| 13 | #if __STDC__
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| 14 | int main(int argc, char **argv);
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| 15 | void crc(char *fname);
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| 16 | #else
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| 17 | void crc();
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| 18 | #endif
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| 19 |
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| 20 | int main(argc, argv)
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| 21 | int argc;
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| 22 | char **argv;
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| 23 | {
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| 24 | char line[256];
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| 25 |
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| 26 | if (argc <= 1)
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| 27 | crc((char *) 0);
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| 28 | else if (argc == 2 && strcmp(argv[1], "-") == 0)
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| 29 | while (fgets(line, sizeof line, stdin) != NULL) {
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| 30 | if (line[strlen(line) - 1] == '\n')
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| 31 | line[strlen(line) - 1] = '\0';
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| 32 | crc(line);
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| 33 | }
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| 34 | else
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| 35 | do {
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| 36 | crc(argv[1]);
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| 37 | argv++;
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| 38 | argc--;
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| 39 | } while (argc > 1);
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| 40 | return(errs != 0);
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| 41 | }
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| 42 |
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| 43 | /* Crctab calculated by Mark G. Mendel, Network Systems Corporation */
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| 44 | static unsigned short crctab[256] = {
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| 45 | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
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| 46 | 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
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| 47 | 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
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| 48 | 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
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| 49 | 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
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| 50 | 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
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| 51 | 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
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| 52 | 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
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| 53 | 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
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| 54 | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
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| 55 | 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
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| 56 | 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
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| 57 | 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
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| 58 | 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
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| 59 | 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
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| 60 | 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
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| 61 | 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
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| 62 | 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
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| 63 | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
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| 64 | 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
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| 65 | 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
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| 66 | 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
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| 67 | 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
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| 68 | 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
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| 69 | 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
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| 70 | 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
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| 71 | 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
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| 72 | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
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| 73 | 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
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| 74 | 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
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| 75 | 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
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| 76 | 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
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| 77 | };
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| 78 |
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| 79 | /* Updcrc macro derived from article Copyright (C) 1986 Stephen Satchell.
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| 80 | * NOTE: First argument must be in range 0 to 255.
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| 81 | * Second argument is referenced twice.
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| 82 | *
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| 83 | * Programmers may incorporate any or all code into their programs,
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| 84 | * giving proper credit within the source. Publication of the
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| 85 | * source routines is permitted so long as proper credit is given
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| 86 | * to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
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| 87 | * Omen Technology.
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| 88 | */
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| 89 |
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| 90 | #define updcrc(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
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| 91 |
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| 92 | void crc(fname)
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| 93 | char *fname;
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| 94 | {
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| 95 | register int c;
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| 96 | register long len = 0;
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| 97 | register unsigned short crc = 0;
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| 98 | register FILE *fp;
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| 99 |
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| 100 | if (fname == NULL)
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| 101 | fp = stdin;
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| 102 | else if ((fp = fopen(fname, "r")) == NULL) {
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| 103 | fprintf(stderr, "crc: Can't open %s: %s\n", fname, strerror(errno));
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| 104 | errs++;
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| 105 | return;
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| 106 | }
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| 107 | while ((c = getc(fp)) != EOF) {
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| 108 | len++;
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| 109 | crc = updcrc(c, crc);
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| 110 | }
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| 111 | printf("%05u %6ld", crc, len);
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| 112 | if (fname) {
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| 113 | printf(" %s", fname);
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| 114 | fclose(fp);
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| 115 | }
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| 116 | printf("\n");
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| 117 | }
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