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Workaround for MSVCRT stdio on MS-Windows for CJK locales

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MSVCRT implementation of stdio functions which output
characters one by one fails for CJK double-byte encodings.
Gnulib provides replacement functions which work around
those bugs.  This change makes Emacs and lib-src programs
use the replacements when Emacs is linked against MSVCRT.
* src/conf_post.h (fwrite, fprintf, printf, vfprintf, vprintf)
[WINDOWSNT]: Redirect to Gnulib replacements when Emacs is linked
against MSVCRT (as opposed to UCRT).  Suggested by Bruno Haible
<bruno@clisp.org>.
This commit is contained in:
Eli Zaretskii 2025-11-16 09:36:03 +02:00
parent cc9ec87e53
commit 2ab07033ea
1 changed files with 38 additions and 0 deletions
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38
src/conf_post.h
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@ -396,3 +396,41 @@ extern int emacs_setenv_TZ (char const *);
: S_ISCHR (mode) ? DT_CHR : S_ISFIFO (mode) ? DT_FIFO \
: S_ISSOCK (mode) ? DT_SOCK : DT_UNKNOWN)
#endif /* MSDOS */
#if defined WINDOWSNT
# if !defined _UCRT
# include <stdarg.h>
# include <stdio.h>
# include <stddef.h>
/* Workarounds for MSVCRT bugs.
The functions below are in Gnulib, but their prototypes and
redirections must be here because the MS-Windows build omits the
Gnulib stdio-h module, which does the below in Gnulib's stdio.h
file, which is not used by the MS-Windows build. */
extern size_t gl_consolesafe_fwrite (const void *ptr, size_t size,
size_t nmemb, FILE *fp)
ARG_NONNULL ((1, 4));
extern int gl_consolesafe_fprintf (FILE *restrict fp,
const char *restrict format, ...)
ATTRIBUTE_FORMAT_PRINTF (2, 3)
ARG_NONNULL ((1, 2));
extern int gl_consolesafe_printf (const char *restrict format, ...)
ATTRIBUTE_FORMAT_PRINTF (1, 2)
ARG_NONNULL ((1));
extern int gl_consolesafe_vfprintf (FILE *restrict fp,
const char *restrict format, va_list args)
ATTRIBUTE_FORMAT_PRINTF (2, 0)
ARG_NONNULL ((1, 2));
extern int gl_consolesafe_vprintf (const char *restrict format, va_list args)
ATTRIBUTE_FORMAT_PRINTF (1, 0)
ARG_NONNULL ((1));
# define fwrite gl_consolesafe_fwrite
# define fprintf gl_consolesafe_fprintf
# define printf gl_consolesafe_printf
# define vfprintf gl_consolesafe_vfprintf
# define vprintf gl_consolesafe_vprintf
# endif /* !_UCRT */
#endif /* WINDOWSNT */