guarantees of u8_mbtouc/u8_strmbtouc (was Re: [PATCH v2 0/5] Speed up uNN_chr and uNN_strchr with Boyer-Moore algorithm)

[Paolo Bonzini]

On 07/29/2010 05:36 PM, Bruno Haible wrote:
> You should better use u8_strmbtouc in this case.

Aha, that's true.  This function is a better match, but only because it 
supports CONFIG_UNICODE_SAFETY and is faster in that case (because it 
can just compare with zero).

Still, without safety u8_strmbtouc(puc, s) uses the same code as 
u8_mbtouc(puc, s, SIZE_MAX), which makes pretty much my point.  I think 
it is safe and actually very useful to document u8_mbtouc/u16_mbtouc as 
looking only one byte (resp. one short) beyond the first complete character.

Paolo