From: Antoine Leca (Antoine10646@leca-marti.org)
Date: Fri Dec 10 2004 - 11:38:23 CST
Arcane Jill va escriure:
> And yet, in an expression such as tolower(trim(s)), the second
> validation is unnecessary. The input to tolower() /must/ be valid,
> because it is the output of trim(). But on the other hand, tolower()
> could be called with arbitrary input, so I can't skip the validation.
What is a "string" ?
If you are using C as language, this is a particularly valid question, since
the output can be larger than the input in general, so you will be resorted
to add a maximum length parameter, or allowing realloc() which means that
the strings are required to be malloc'ed on first place.
As a result, your strings are likely to be some stuctures.
Then, it is pretty easy to add some s_valid flag, and you are done.
Antoine
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