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Date:	Fri, 27 Jan 2012 12:19:44 +0000
From:	Chris January <chris AT atomice DOT net>
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On 27.01.2012 10:46, Václav Zeman wrote:
>> +#define is_dos_path(s) (isdrive(s) \
>> +			|| ((s)[0] == '\\' \
>> +			    && (s)[1] == '\\' \
>> +			    && isalpha ((s)[2]) \
>> +			    && strchr ((s) + 3, '\\')))
> Is it safe to access 2nd, 3rd and 4th characters of the word without
> checking the length first?

Yes, if s is a NUL-terminated string. If s[0] != '\0' (because, e.g., 
s[0] == '\\') then s[1] is valid; if s[1] != '\0' then s[2] is valid, 
and so on.

Chris


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