FreeCalypso > hg > freecalypso-tools

annotate target-utils/simagent/stringarg.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 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 }