FreeCalypso > hg > freecalypso-tools
annotate target-utils/simagent/stringarg.c @ 994:ad3041e19884
fc-loadtool flash: implement PPB ops for Spansion PL-N
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 03 Dec 2023 06:16:30 +0000 |
parents | 0cffc53991f9 |
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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 } |