FreeCalypso > hg > freecalypso-sw
annotate loadtools/hexdecode.c @ 278:f77480d3dd21
fc-fsio: first ffs2ver command implemented
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 24 Feb 2014 04:41:57 +0000 |
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1 /* |
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2 * This module contains the decode_hex_byte() function, |
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3 * which is used by the SREC file reader and will likely be used |
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4 * by other code as well, such as the dump-to-file function |
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5 * of loadtool. |
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6 */ |
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7 |
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8 #include <ctype.h> |
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9 |
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10 decode_hex_byte(s) |
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11 char *s; |
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12 { |
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13 register int u, l; |
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14 |
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15 if (!isxdigit(s[0]) || !isxdigit(s[1])) |
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16 return(-1); |
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17 if (isdigit(s[0])) |
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18 u = s[0] - '0'; |
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19 else if (isupper(s[0])) |
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20 u = s[0] - 'A' + 10; |
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21 else |
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22 u = s[0] - 'a' + 10; |
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23 if (isdigit(s[1])) |
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24 l = s[1] - '0'; |
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25 else if (isupper(s[1])) |
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26 l = s[1] - 'A' + 10; |
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27 else |
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28 l = s[1] - 'a' + 10; |
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29 return((u << 4) | l); |
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30 } |