[bug #31650] ice-9 regexp doesn't work with multibyte chars

[Andy Wingo <INVALID.NOREPLY@gnu.org>]

URL:
  <http://savannah.gnu.org/bugs/?31650>

                 Summary: ice-9 regexp doesn't work with multibyte chars
                 Project: Guile
            Submitted by: wingo
            Submitted on: Sun 14 Nov 2010 10:59:13 AM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Steps to reproduce:

> (setlocale LC_ALL)
> (match:substring (string-match ".*" "calçot") 0)

Expected results:

"calçot"

Actual results:

ERROR: In procedure substring:
ERROR: Value out of range 0 to 6: 7

I think what is happening is that as per
http://www.gnu.org/software/libc/manual/html_node/Regexp-Subexpressions.html#Regexp-Subexpressions,
the regmatch_t structure gives us *byte offsets* at which the string matched,
but Guile's match structures need *char offsets*. So we need to be able to do
a reverse mapping between byte index of a string as encoded in the current
locale to the character index.




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