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annotate libcoding/gsmtime_enc.c @ 28:6e925aa54727

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libcoding: more sensible naming of GSM time encoding and decoding modules
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Jun 2024 02:32:11 +0000
parents libcoding/timestamp.c@b831ee7d512c
children
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6
b831ee7d512c libcoding: add absolute time encoding function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * The function implemented in this module encodes a GSM SMS absolute timestamp
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3 * from ASCII representation into PDU octets.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <ctype.h>
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8
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9 encode_gsm_sms_abstime(str, bin)
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10 char *str;
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11 u_char *bin;
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12 {
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13 u_char digits[14];
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14
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15 if (!isdigit(str[0]) || !isdigit(str[1]))
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16 return(-1);
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17 digits[0] = str[0] - '0';
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18 digits[1] = str[1] - '0';
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19 if (str[2] != '/')
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20 return(-1);
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21 if (!isdigit(str[3]) || !isdigit(str[4]))
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22 return(-1);
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23 digits[2] = str[3] - '0';
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24 digits[3] = str[4] - '0';
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25 if (str[5] != '/')
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26 return(-1);
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27 if (!isdigit(str[6]) || !isdigit(str[7]))
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28 return(-1);
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29 digits[4] = str[6] - '0';
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30 digits[5] = str[7] - '0';
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31 if (str[8] != ',')
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32 return(-1);
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33 if (!isdigit(str[9]) || !isdigit(str[10]))
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34 return(-1);
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35 digits[6] = str[9] - '0';
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36 digits[7] = str[10] - '0';
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37 if (str[11] != ':')
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38 return(-1);
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39 if (!isdigit(str[12]) || !isdigit(str[13]))
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40 return(-1);
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41 digits[8] = str[12] - '0';
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42 digits[9] = str[13] - '0';
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43 if (str[14] != ':')
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44 return(-1);
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45 if (!isdigit(str[15]) || !isdigit(str[16]))
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46 return(-1);
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47 digits[10] = str[15] - '0';
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48 digits[11] = str[16] - '0';
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49 if (str[17] != '+' && str[17] != '-')
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50 return(-1);
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51 if (!isdigit(str[18]) || !isdigit(str[19]))
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52 return(-1);
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53 digits[12] = str[18] - '0';
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54 digits[13] = str[19] - '0';
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55 if (str[20])
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56 return(-1);
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57 if (str[17] == '-')
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58 digits[12] |= 8;
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59 pack_digit_bytes(digits, bin, 7);
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60 return(0);
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61 }