wcswidth, mbswidth: Avoid integer overflow.

[pspp] / ChangeLog

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+2011-03-12  Bruno Haible  <bruno@clisp.org>
+
+       wcswidth, mbswidth: Avoid integer overflow.
+       * lib/wcswidth.c: Include <limits.h>.
+       * lib/wcswidth-impl.h (wcswidth): Avoid 'int' overflow.
+       * lib/mbswidth.c: Include <limits.h>.
+       (mbsnwidth): Avoid 'int' overflow.
+       Reported by Jim Meyering.
+
 2011-03-12  Bruno Haible  <bruno@clisp.org>
 
        futimens, utimensat: Avoid endless recursion on Solaris 10.