FreeCalypso > hg > freecalypso-tools

annotate miscutil/imei-luhn.c @ 416:30f6d1c32c6f

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doc/Flash-boot-defect article removed (no longer relevant) This article is no longer relevant because the issue in question only affected one (1) defective FCDEV3B board which was not and never will be sold.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 26 Oct 2018 07:11:08 +0000
parents e7502631a0f9
children
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e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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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Mychaela Falconia <falcon@freecalypso.org>
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4 * given a 15-digit number as input.
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Mychaela Falconia <falcon@freecalypso.org>
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5 *
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Mychaela Falconia <falcon@freecalypso.org>
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6 * The number given on the command line may optionally include punctuation,
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Mychaela Falconia <falcon@freecalypso.org>
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7 * which is skipped and ignored.
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Mychaela Falconia <falcon@freecalypso.org>
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8 */
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Mychaela Falconia <falcon@freecalypso.org>
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9
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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14 char digits[15];
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Mychaela Falconia <falcon@freecalypso.org>
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15
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Mychaela Falconia <falcon@freecalypso.org>
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16 compute_cd()
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Mychaela Falconia <falcon@freecalypso.org>
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17 {
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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21 for (i = 0; i < 14; i++) {
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Mychaela Falconia <falcon@freecalypso.org>
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22 dig = digits[i];
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Mychaela Falconia <falcon@freecalypso.org>
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23 if (i & 1) {
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Mychaela Falconia <falcon@freecalypso.org>
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24 dig *= 2;
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Mychaela Falconia <falcon@freecalypso.org>
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25 if (dig > 9)
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Mychaela Falconia <falcon@freecalypso.org>
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26 dig -= 9;
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Mychaela Falconia <falcon@freecalypso.org>
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27 }
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Mychaela Falconia <falcon@freecalypso.org>
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28 sum += dig;
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Mychaela Falconia <falcon@freecalypso.org>
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29 }
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Mychaela Falconia <falcon@freecalypso.org>
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30 dig = sum % 10;
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Mychaela Falconia <falcon@freecalypso.org>
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31 if (dig)
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Mychaela Falconia <falcon@freecalypso.org>
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32 dig = 10 - dig;
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Mychaela Falconia <falcon@freecalypso.org>
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33 return dig;
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Mychaela Falconia <falcon@freecalypso.org>
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34 }
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Mychaela Falconia <falcon@freecalypso.org>
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35
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Mychaela Falconia <falcon@freecalypso.org>
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36 main(argc, argv)
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Mychaela Falconia <falcon@freecalypso.org>
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37 char **argv;
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Mychaela Falconia <falcon@freecalypso.org>
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38 {
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Mychaela Falconia <falcon@freecalypso.org>
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39 char *cp;
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Mychaela Falconia <falcon@freecalypso.org>
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40 int i;
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Mychaela Falconia <falcon@freecalypso.org>
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41
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Mychaela Falconia <falcon@freecalypso.org>
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42 if (argc != 2) {
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Mychaela Falconia <falcon@freecalypso.org>
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43 usage: fprintf(stderr, "usage: %s number\n", argv[0]);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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44 exit(2);
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Mychaela Falconia <falcon@freecalypso.org>
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45 }
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Mychaela Falconia <falcon@freecalypso.org>
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46 cp = argv[1];
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Mychaela Falconia <falcon@freecalypso.org>
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47 if (!isdigit(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
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48 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
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49 for (i = 0; *cp; ) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 if (ispunct(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
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51 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 if (!isdigit(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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54 if (i >= 15) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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55 wrong_len: fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
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56 "error: argument must have 14 or 15 digits\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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57 exit(2);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59 digits[i++] = *cp++ - '0';
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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61 switch (i) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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62 case 14:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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63 printf("%d\n", compute_cd());
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 exit(0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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65 case 15:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 if (digits[14] == compute_cd()) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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67 printf("IMEI OK\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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68 exit(0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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69 } else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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70 printf("Check digit mismatch!\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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72 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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73 default:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 goto wrong_len;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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75 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 }