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annotate libcommon/number_decode.c @ 8:4a9bf783491d

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phone number decoding factored out
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Feb 2021 00:07:24 +0000
parents
children f5a26c1d0b93
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8
4a9bf783491d phone number decoding factored out
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1 /*
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2 * This module implements functions for decoding 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
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7 static char gsm_address_digits[16] =
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8 {'0','1','2','3','4','5','6','7','8','9','*','#','a','b','c','?'};
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9
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10 decode_phone_number(data, nbytes, out)
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11 u_char *data;
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12 unsigned nbytes;
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13 char *out;
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14 {
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15 u_char *dp, *endp;
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16 int c;
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17
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18 dp = data;
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19 endp = data + nbytes;
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20 while (dp < endp) {
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21 c = *dp & 0xF;
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22 if (c == 0xF)
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23 return(-1);
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24 *out++ = gsm_address_digits[c];
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25 c = *dp >> 4;
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26 if (c == 0xF) {
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27 if (dp + 1 == endp)
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28 break;
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29 else
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30 return(-1);
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31 }
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32 *out++ = gsm_address_digits[c];
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33 dp++;
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34 }
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35 *out = '\0';
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36 return(0);
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37 }