FreeCalypso > hg > freecalypso-tools

annotate miscutil/imei-luhn.c @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents e7502631a0f9
children
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Mychaela Falconia <falcon@freecalypso.org>
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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 }