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annotate libutil/hexdigits.c @ 222:8c151bb01d28

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doc/GrcardSIM2-WEKI-file: update for partial understanding and implementation
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 09 Mar 2021 03:13:41 +0000
parents 3698c8192d2d
children
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3698c8192d2d libutil: hex digit functions factored out
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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 }