FreeCalypso > hg > freecalypso-tools

annotate target-utils/simagent/stringarg.c @ 845:aec320fe2653

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fc-tmsync: new madc command reads all 8 MADC channels
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Jul 2021 22:23:05 +0000
parents 0cffc53991f9
children
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1 /*
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2 * This module contains the function that parses our hex string arguments.
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3 */
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4
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5 #include <ctype.h>
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6 #include "types.h"
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7
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8 static
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9 decode_hex_digit(c)
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10 {
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11 if (isdigit(c))
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12 return c - '0';
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13 else if (islower(c))
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14 return c - 'a' + 10;
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15 else
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16 return c - 'A' + 10;
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17 }
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18
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19 decode_hex_string_arg(arg, buf, maxlen)
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20 char *arg;
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21 u8 *buf;
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22 unsigned maxlen;
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23 {
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24 unsigned count;
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25
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26 for (count = 0; ; ) {
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27 while (isspace(*arg))
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28 arg++;
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29 if (!*arg)
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30 break;
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31 if (!isxdigit(arg[0]) || !isxdigit(arg[1])) {
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32 printf("ERROR: invalid hex string input\n");
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33 return(-1);
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34 }
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35 if (count >= maxlen) {
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36 printf("ERROR: hex string input is too long\n");
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37 return(-1);
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38 }
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39 buf[count++] = (decode_hex_digit(arg[0]) << 4) |
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40 decode_hex_digit(arg[1]);
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41 arg += 2;
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42 }
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43 return count;
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44 }