FreeCalypso > hg > freecalypso-tools

annotate miscutil/imei-luhn.c @ 505:7bf0d909c87e

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fc-loadtool flash ID check: change of reset after the check logic This change only affects those flash configurations that have ID checks enabled. The logic for resetting the flash after the ID check has been changed as follows: 1) If the check fails, we return without attempting to reset the flash. 2) If the check is successful, we reset the flash using the configured method (could be AMD or Intel or Intel W30) instead of always doing an AMD flash reset as the original code did.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 May 2019 19:58:01 +0000
parents e7502631a0f9
children
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1 /*
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2 * This program computes the Luhn check digit for an IMEI number given
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Mychaela Falconia <falcon@freecalypso.org>
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3 * the first 14 digits, or verifies the correctness of this check digit
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4 * given a 15-digit number as input.
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5 *
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6 * The number given on the command line may optionally include punctuation,
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7 * which is skipped and ignored.
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8 */
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9
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10 #include <stdio.h>
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11 #include <ctype.h>
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12 #include <stdlib.h>
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13
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14 char digits[15];
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15
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16 compute_cd()
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17 {
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18 int i, dig, sum;
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19
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20 sum = 0;
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21 for (i = 0; i < 14; i++) {
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22 dig = digits[i];
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23 if (i & 1) {
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24 dig *= 2;
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25 if (dig > 9)
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26 dig -= 9;
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27 }
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28 sum += dig;
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29 }
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30 dig = sum % 10;
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31 if (dig)
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32 dig = 10 - dig;
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33 return dig;
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34 }
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35
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36 main(argc, argv)
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37 char **argv;
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38 {
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39 char *cp;
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40 int i;
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41
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42 if (argc != 2) {
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43 usage: fprintf(stderr, "usage: %s number\n", argv[0]);
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44 exit(2);
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45 }
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46 cp = argv[1];
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47 if (!isdigit(*cp))
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48 goto usage;
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49 for (i = 0; *cp; ) {
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50 if (ispunct(*cp))
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51 cp++;
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52 if (!isdigit(*cp))
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53 goto usage;
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54 if (i >= 15) {
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55 wrong_len: fprintf(stderr,
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56 "error: argument must have 14 or 15 digits\n");
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57 exit(2);
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58 }
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59 digits[i++] = *cp++ - '0';
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60 }
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61 switch (i) {
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62 case 14:
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63 printf("%d\n", compute_cd());
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64 exit(0);
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65 case 15:
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66 if (digits[14] == compute_cd()) {
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67 printf("IMEI OK\n");
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68 exit(0);
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69 } else {
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70 printf("Check digit mismatch!\n");
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71 exit(1);
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72 }
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73 default:
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74 goto wrong_len;
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75 }
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76 }