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annotate smsc-sendmt/hexdecode.c @ 15:ce6bcb84ca30

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doc/Proto-SMSC-testing: document written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Aug 2023 21:47:19 -0800
parents 7543aa173634
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This library module implements decoding of long hex strings,
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3 * such as SMS PDUs.
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4 */
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5
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6 #include <ctype.h>
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7 #include <stdint.h>
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8
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9 int decode_hex_line(const char *inbuf, uint8_t *outbuf, unsigned outmax)
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10 {
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11 const char *inp = inbuf;
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12 uint8_t *outp = outbuf;
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13 unsigned outcnt = 0;
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14 int c, d[2], i;
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15
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16 while (*inp) {
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17 if (!isxdigit(inp[0]) || !isxdigit(inp[1]))
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18 return(-1);
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19 if (outcnt >= outmax)
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20 break;
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21 for (i = 0; i < 2; i++) {
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22 c = *inp++;
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23 if (isdigit(c))
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24 d[i] = c - '0';
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25 else if (isupper(c))
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26 d[i] = c - 'A' + 10;
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27 else
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28 d[i] = c - 'a' + 10;
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29 }
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30 *outp++ = (d[0] << 4) | d[1];
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31 outcnt++;
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32 }
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33 return outcnt;
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34 }