FreeCalypso > hg > freecalypso-tools

annotate miscutil/imei-luhn.c @ 921:74d284add54d

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fc-fsio: guard against bogus readdir results from the target If the FFS being operated on contains SE K2x0 extended filenames, readdir will return strings that are bad for printing. We need to guard against this possibility, and also against possible other bogosity that could be sent by other alien firmwares.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Dec 2022 22:55:23 +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>
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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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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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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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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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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>
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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>
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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>
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52 if (!isdigit(*cp))
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Mychaela Falconia <falcon@freecalypso.org>
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53 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
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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>
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57 exit(2);
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Mychaela Falconia <falcon@freecalypso.org>
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58 }
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Mychaela Falconia <falcon@freecalypso.org>
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59 digits[i++] = *cp++ - '0';
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Mychaela Falconia <falcon@freecalypso.org>
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
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61 switch (i) {
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Mychaela Falconia <falcon@freecalypso.org>
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62 case 14:
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Mychaela Falconia <falcon@freecalypso.org>
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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 }