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25 lines
471 B
C
25 lines
471 B
C
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int
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hextobyte (const char *s)
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{
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int c;
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if ( *s >= '0' && *s <= '9' )
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c = 16 * (*s - '0');
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else if ( *s >= 'A' && *s <= 'F' )
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c = 16 * (10 + *s - 'A');
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else if ( *s >= 'a' && *s <= 'f' )
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c = 16 * (10 + *s - 'a');
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else
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return -1;
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s++;
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if ( *s >= '0' && *s <= '9' )
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c += *s - '0';
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else if ( *s >= 'A' && *s <= 'F' )
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c += 10 + *s - 'A';
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else if ( *s >= 'a' && *s <= 'f' )
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c += 10 + *s - 'a';
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else
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return -1;
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return c;
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}
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