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syscalls: Add fallback case for ‘terminal-string-width’. 

This makes ‘terminal-string-width’ synonymous with ‘string-length’ when
running one a statically-linked Guile, as is the case in some unit
tests, instead of throwing ENOSYS.

* guix/build/syscalls.scm (terminal-string-width): Use ‘dynamic-func’
and ‘pointer->procedure’ instead of ‘syscall->procedure’.  Return
‘string-length’ when one of the ‘dynamic-func’ calls fails.

Change-Id: Icf55c9e7c34b46fac91b665fb4a2ecb02160f22e
This commit is contained in:
Ludovic Courtès 2023-11-23 15:18:32 +01:00
parent 1566e00fbc
commit a14dafaa01
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 16 additions and 10 deletions
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26
guix/build/syscalls.scm
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@ -2338,18 +2338,24 @@ always a positive integer."
(terminal-dimension window-size-rows port (const 25)))
(define terminal-string-width
(let ((mbstowcs (syscall->procedure int "mbstowcs" (list '* '* size_t)))
(wcswidth (syscall->procedure int "wcswidth" (list '* size_t))))
(lambda (str)
"Return the width of a string as it would be printed on the terminal.
(let ((mbstowcs (and=> (false-if-exception
(dynamic-func "mbstowcs" (dynamic-link)))
(cute pointer->procedure int <> (list '* '* size_t))))
(wcswidth (and=> (false-if-exception
(dynamic-func "wcswidth" (dynamic-link)))
(cute pointer->procedure int <> (list '* size_t)))))
(if (and mbstowcs wcswidth)
(lambda (str)
"Return the width of a string as it would be printed on the terminal.
This procedure accounts for characters that have a different width than 1, such
as CJK double-width characters."
(let ((wchar (make-bytevector (* (+ (string-length str) 1) 4))))
(mbstowcs (bytevector->pointer wchar)
(string->pointer str)
(string-length str))
(wcswidth (bytevector->pointer wchar)
(string-length str))))))
(let ((wchar (make-bytevector (* (+ (string-length str) 1) 4))))
(mbstowcs (bytevector->pointer wchar)
(string->pointer str)
(string-length str))
(wcswidth (bytevector->pointer wchar)
(string-length str))))
string-length))) ;using a statically-linked Guile
(define openpty
(let ((proc (syscall->procedure int "openpty" '(* * * * *)