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Rev 2001 Rev 2048
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#define is_digit(d)     (((d) >= '0') && ((d) <= '9'))
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#define is_digit(d) (((d) >= '0') && ((d) <= '9'))
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#define is_lower(c)     (((c) >= 'a') && ((c) <= 'z'))
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#define is_lower(c) (((c) >= 'a') && ((c) <= 'z'))
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#define is_upper(c)     (((c) >= 'A') && ((c) <= 'Z'))
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#define is_upper(c) (((c) >= 'A') && ((c) <= 'Z'))
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#define is_alpha(c)     (is_lower(c) || is_upper(c))
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#define is_alpha(c) (is_lower(c) || is_upper(c))
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#define is_alphanum(c)      (is_alpha(c) || is_digit(c))
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#define is_alphanum(c)  (is_alpha(c) || is_digit(c))
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#define is_white(c)     (((c) == ' ') || ((c) == '\t') || ((c) == '\n') || ((c) == '\r'))
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#define is_white(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n') || \
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                ((c) == '\r'))
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#define min(a,b)    ((a) < (b) ? (a) : (b))
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#define min(a,b)    ((a) < (b) ? (a) : (b))
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#define max(a,b)    ((a) > (b) ? (a) : (b))
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#define max(a,b)    ((a) > (b) ? (a) : (b))
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/** Return true if the interlvals overlap.
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/** Return true if the interlvals overlap.