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annotate libutil/number_encode.c @ 6:86b4f288862d

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libutil: functions for encoding MSISDN record
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 Feb 2021 00:41:12 +0000
parents
children
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6
86b4f288862d libutil: functions for encoding MSISDN record
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
86b4f288862d libutil: functions for encoding MSISDN record
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2 * This module implements functions for encoding phone numbers.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9
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10 digit_char_to_gsm(ch)
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11 {
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12 switch (ch) {
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13 case '0':
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14 case '1':
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15 case '2':
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16 case '3':
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17 case '4':
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18 case '5':
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19 case '6':
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20 case '7':
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21 case '8':
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22 case '9':
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23 return (ch - '0');
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24 case '*':
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25 return 0xA;
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26 case '#':
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27 return 0xB;
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28 case 'a':
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29 case 'b':
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30 case 'c':
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31 return (ch - 'a' + 0xC);
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32 case 'A':
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33 case 'B':
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34 case 'C':
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35 return (ch - 'A' + 0xC);
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36 }
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37 return (-1);
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38 }
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39
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40 void
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41 pack_digit_bytes(digits, dest, num_digit_bytes)
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42 u_char *digits, *dest;
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43 unsigned num_digit_bytes;
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44 {
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45 u_char *sp, *dp;
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46 unsigned n;
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47
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48 sp = digits;
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49 dp = dest;
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50 for (n = 0; n < num_digit_bytes; n++) {
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51 *dp++ = sp[0] | (sp[1] << 4);
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52 sp += 2;
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53 }
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54 }
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55
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56 encode_phone_number_arg(arg, fixp, mode)
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57 char *arg;
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58 u_char *fixp;
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59 {
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60 u_char digits[20];
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61 unsigned ndigits, num_digit_bytes;
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62 char *cp, *endp;
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63 int c;
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64
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65 cp = arg;
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66 if (*cp == '+') {
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67 fixp[1] = 0x91;
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68 cp++;
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69 } else
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70 fixp[1] = 0x81;
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71 if (digit_char_to_gsm(*cp) < 0) {
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72 inv_arg: fprintf(stderr, "error: invalid phone number argument\n");
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73 return(-1);
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74 }
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75 for (ndigits = 0; ; ndigits++) {
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76 c = digit_char_to_gsm(*cp);
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77 if (c < 0)
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78 break;
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79 cp++;
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80 if (ndigits >= 20) {
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81 fprintf(stderr, "error: too many number digits\n");
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82 return(-1);
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83 }
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84 digits[ndigits] = c;
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85 }
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86 if (mode)
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87 fixp[0] = ndigits;
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88 if (ndigits & 1)
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89 digits[ndigits++] = 0xF;
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90 num_digit_bytes = ndigits >> 1;
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91 if (!mode)
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92 fixp[0] = num_digit_bytes + 1;
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93 pack_digit_bytes(digits, fixp + 2, num_digit_bytes);
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94 if (*cp == ',') {
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95 cp++;
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96 if (!isdigit(*cp))
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97 goto inv_arg;
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98 fixp[1] = strtoul(cp, &endp, 0);
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99 if (*endp)
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100 goto inv_arg;
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101 } else if (*cp)
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102 goto inv_arg;
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103 return(0);
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104 }