FreeCalypso > hg > freecalypso-tools

annotate uptools/libcoding/hexdecode.c @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents 18c692984549
children
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18c692984549 uptools/libcoding: hex line decoding implemented
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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 <sys/types.h>
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7 #include <ctype.h>
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8
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9 decode_hex_line(inbuf, outbuf, outmax)
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10 char *inbuf;
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11 u_char *outbuf;
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12 unsigned outmax;
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13 {
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14 char *inp = inbuf;
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15 u_char *outp = outbuf;
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16 unsigned outcnt = 0;
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17 int c, d[2], i;
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18
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19 while (*inp) {
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20 if (!isxdigit(inp[0]) || !isxdigit(inp[1]))
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21 return(-1);
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22 if (outcnt >= outmax)
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23 break;
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24 for (i = 0; i < 2; i++) {
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25 c = *inp++;
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26 if (isdigit(c))
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27 d[i] = c - '0';
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28 else if (isupper(c))
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29 d[i] = c - 'A' + 10;
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30 else
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31 d[i] = c - 'a' + 10;
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32 }
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33 *outp++ = (d[0] << 4) | d[1];
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34 outcnt++;
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35 }
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36 return outcnt;
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37 }