Re: [3.0] UTF-8 and ${#var} or ${var: -1}

[Stephane Chazelas]

On Thu, Sep 02, 2004 at 01:25:00PM +0100, Tim Waugh wrote:
[...]
> +#define MBSLEN(s,n) (((s) && (s)[0]) ? ((s)[1] ? ((s)[2] ?
> mbstowcs(NULL,s,n) : 2) : 1) : 0)
[...]

That doesn't work for strings less that 3 bytes long because of
the optimisation above that can't be applied to multibyte:

$ a=$'\303\251' LC_ALL=fr.UTF-8 truss -t '' -u '*:mbs*' ./bash -c 'echo ${#a}'
2

$ a=$'a\303\251' LC_ALL=fr.UTF-8 truss -t '' -u '*:mbs*' ./bash -c 'echo ${#a}'
-> libc:mbstowcs(0x0, 0xc6278, 0x3, 0x7efefeff)
<- libc:mbstowcs() = 2
2


(in the first case, mbstowcs is not called).

Fix: just disable the optimisation.

-- 
Stephane

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