FreeCalypso > hg > freecalypso-tools

annotate miscutil/make-imeisv.c @ 745:9e3b1ef1f440

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make-imeisv utility documented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 19 Oct 2020 06:47:13 +0000
parents 2dcfad8a3ed0
children
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2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
2dcfad8a3ed0 make-imeisv utility written
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2 * This utility constructs a 16-digit IMEISV from a 15-digit IMEI
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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3 * (which must have a valid Luhn check digit) and a 2-digit SV field.
2dcfad8a3ed0 make-imeisv utility written
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4 * It is intended for use in shell scripts.
2dcfad8a3ed0 make-imeisv utility written
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5 */
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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6
2dcfad8a3ed0 make-imeisv utility written
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7 #include <stdio.h>
2dcfad8a3ed0 make-imeisv utility written
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8 #include <ctype.h>
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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9 #include <stdlib.h>
2dcfad8a3ed0 make-imeisv utility written
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10
2dcfad8a3ed0 make-imeisv utility written
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11 parse_imei_arg(input, buf)
2dcfad8a3ed0 make-imeisv utility written
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12 char *input, *buf;
2dcfad8a3ed0 make-imeisv utility written
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13 {
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14 char *cp;
2dcfad8a3ed0 make-imeisv utility written
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15 int i;
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16
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Mychaela Falconia <falcon@freecalypso.org>
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17 cp = input;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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18 if (!isdigit(*cp)) {
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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19 inv: fprintf(stderr,
2dcfad8a3ed0 make-imeisv utility written
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20 "error: IMEI argument must have 15 decimal digits\n");
2dcfad8a3ed0 make-imeisv utility written
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21 exit(1);
2dcfad8a3ed0 make-imeisv utility written
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22 }
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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23 for (i = 0; i < 15; i++) {
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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24 if (ispunct(*cp))
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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25 cp++;
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Mychaela Falconia <falcon@freecalypso.org>
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26 if (!isdigit(*cp))
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27 goto inv;
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28 buf[i] = *cp++;
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29 }
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30 if (*cp)
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31 goto inv;
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32 }
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33
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34 check_luhn(digits)
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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35 char *digits;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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36 {
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Mychaela Falconia <falcon@freecalypso.org>
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37 int i, dig, sum;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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38
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39 sum = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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40 for (i = 0; i < 14; i++) {
2dcfad8a3ed0 make-imeisv utility written
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41 dig = digits[i] - '0';
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42 if (i & 1) {
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43 dig *= 2;
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Mychaela Falconia <falcon@freecalypso.org>
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44 if (dig > 9)
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Mychaela Falconia <falcon@freecalypso.org>
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45 dig -= 9;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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46 }
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Mychaela Falconia <falcon@freecalypso.org>
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47 sum += dig;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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48 }
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Mychaela Falconia <falcon@freecalypso.org>
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49 dig = sum % 10;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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50 if (dig)
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Mychaela Falconia <falcon@freecalypso.org>
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51 dig = 10 - dig;
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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52 if (digits[14] != dig + '0') {
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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53 fprintf(stderr, "error: given IMEI fails Luhn check\n");
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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54 exit(1);
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55 }
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Mychaela Falconia <falcon@freecalypso.org>
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56 }
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57
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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58 main(argc, argv)
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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59 char **argv;
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60 {
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Mychaela Falconia <falcon@freecalypso.org>
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61 char imeibuf[15];
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62
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63 if (argc != 3) {
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64 fprintf(stderr, "usage: %s IMEI SV\n", argv[0]);
2dcfad8a3ed0 make-imeisv utility written
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65 exit(1);
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66 }
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Mychaela Falconia <falcon@freecalypso.org>
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67 parse_imei_arg(argv[1], imeibuf);
2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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68 check_luhn(imeibuf);
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69 if (!isdigit(argv[2][0]) || !isdigit(argv[2][1]) || argv[2][2]) {
2dcfad8a3ed0 make-imeisv utility written
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70 fprintf(stderr,
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71 "error: SV argument must have 2 decimal digits\n");
2dcfad8a3ed0 make-imeisv utility written
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72 exit(1);
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73 }
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Mychaela Falconia <falcon@freecalypso.org>
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74 printf("%.8s-%.6s-%s\n", imeibuf, imeibuf + 8, argv[2]);
2dcfad8a3ed0 make-imeisv utility written
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75 exit(0);
2dcfad8a3ed0 make-imeisv utility written
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76 }