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annotate libcoding/gsmtime_dec.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/gsmtime.c@7418ca2e9949
children
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7418ca2e9949 libcoding: add functions from freecalypso-tools/uptools/libcoding
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1 /*
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2 * This library module implements decoding of GSM timestamps.
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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 <stdio.h>
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7
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8 gsm_timestamp_decode(inbuf, outbuf)
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9 u_char *inbuf;
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10 char *outbuf;
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11 {
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12 u_char rev[7];
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13 int i, d1, d2, tzsign;
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14
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15 for (i = 0; i < 7; i++) {
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16 d1 = inbuf[i] & 0xF;
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17 d2 = inbuf[i] >> 4;
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18 rev[i] = (d1 << 4) | d2;
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19 }
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20 if (rev[6] & 0x80) {
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21 rev[6] &= 0x7F;
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22 tzsign = '-';
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23 } else
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24 tzsign = '+';
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25 sprintf(outbuf, "%02X/%02X/%02X,%02X:%02X:%02X%c%02X", rev[0], rev[1],
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26 rev[2], rev[3], rev[4], rev[5], tzsign, rev[6]);
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27 }