FreeCalypso > hg > freecalypso-tools
annotate target-utils/libcommon/hexstrings.c @ 785:56506e9165bc
simagent: Rx data direction implemented for exchange
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 13 Mar 2021 22:17:39 +0000 |
parents | 0da2cf5a999c |
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Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
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Mychaela Falconia <falcon@freecalypso.org>
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2 * The decode_hex_digits() function contained in this module |
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Mychaela Falconia <falcon@freecalypso.org>
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3 * will be used by the XRAM and flash loading commands |
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Mychaela Falconia <falcon@freecalypso.org>
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4 * which take SREC-like long hex string arguments. |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 */ |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 |
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <ctype.h> |
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include "types.h" |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 |
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Mychaela Falconia <falcon@freecalypso.org>
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10 decode_hex_digits(str, ndigits, valp) |
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Mychaela Falconia <falcon@freecalypso.org>
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11 char *str; |
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12 int ndigits; |
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13 u32 *valp; |
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14 { |
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Mychaela Falconia <falcon@freecalypso.org>
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15 u32 accum; |
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16 int i, c; |
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17 |
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18 accum = 0; |
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19 for (i = 0; i < ndigits; i++) { |
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20 c = *str++; |
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21 if (!isxdigit(c)) |
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22 return(-1); |
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23 accum <<= 4; |
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24 if (isdigit(c)) |
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25 accum += c - '0'; |
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26 else if (islower(c)) |
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27 accum += c - 'a' + 10; |
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28 else |
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29 accum += c - 'A' + 10; |
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30 } |
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31 *valp = accum; |
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32 return(0); |
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33 } |