FreeCalypso > hg > fc-sim-tools

annotate libutil/hexdigits.c @ 53:fbedb67d234f

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serial: fix parity for inverse coding convention Important note: it is my (Mother Mychaela's) understanding that SIM cards with inverse coding convention are extremely rare, and I have never seen such a card. Therefore, our support for the inverse coding convention will likely remain forever untested.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Mar 2021 20:46:09 +0000
parents 34bbb0585cab
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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8
34bbb0585cab libutil: import from previous fc-pcsc-tools version
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1 /*
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2 * This module contains elementary functions for working with hex digits.
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3 */
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4
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5 decode_hex_digit(c)
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6 {
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7 if (c >= '0' && c <= '9')
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8 return(c - '0');
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9 if (c >= 'A' && c <= 'F')
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10 return(c - 'A' + 10);
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11 if (c >= 'a' && c <= 'f')
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12 return(c - 'a' + 10);
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13 return(-1);
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14 }
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15
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16 encode_hex_digit(d)
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17 unsigned d;
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18 {
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19 if (d <= 9)
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20 return(d + '0');
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21 else
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22 return(d - 10 + 'A');
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23 }