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*printf-posix: Work around bug with %lc of 0 on many platforms.
* lib/vasnprintf.c (local_wctomb): Define also for
NEED_PRINTF_DIRECTIVE_LC.
(VASNPRINTF): Implement %lc handling ourselves if
NEED_PRINTF_DIRECTIVE_LC.
* m4/printf.m4 (gl_PRINTF_DIRECTIVE_LC): New macro.
* m4/vasnprintf.m4 (gl_PREREQ_VASNPRINTF_DIRECTIVE_LC): New macro.
(gl_PREREQ_VASNPRINTF_WITH_EXTRAS): Invoke it.
* m4/dprintf-posix.m4 (gl_FUNC_DPRINTF_POSIX): Require
gl_PRINTF_DIRECTIVE_LC and test its result. Invoke
gl_PREREQ_VASNPRINTF_DIRECTIVE_LC.
* m4/fprintf-posix.m4 (gl_FUNC_FPRINTF_POSIX): Likewise.
* m4/obstack-printf-posix.m4 (gl_FUNC_OBSTACK_PRINTF_POSIX): Likewise.
* m4/snprintf-posix.m4 (gl_FUNC_SNPRINTF_POSIX): Likewise.
* m4/sprintf-posix.m4 (gl_FUNC_SPRINTF_POSIX): Likewise.
* m4/vasnprintf-posix.m4 (gl_FUNC_VASNPRINTF_POSIX): Likewise.
* m4/vasprintf-posix.m4 (gl_FUNC_VASPRINTF_POSIX): Likewise.
* m4/vdprintf-posix.m4 (gl_FUNC_VDPRINTF_POSIX): Likewise.
* m4/vfprintf-posix.m4 (gl_FUNC_VFPRINTF_POSIX): Likewise.
* m4/vsnprintf-posix.m4 (gl_FUNC_VSNPRINTF_POSIX): Likewise.
* m4/vsprintf-posix.m4 (gl_FUNC_VSPRINTF_POSIX): Likewise.
* tests/test-snprintf-posix.h (test_function): Add more tests for the
%c and %lc directives.
* tests/test-sprintf-posix.h (test_function): Likewise.
* tests/test-vasnprintf-posix.c (test_function): Likewise.
* tests/test-vasprintf-posix.c (test_function): Likewise.
* doc/glibc-functions/asprintf.texi: Mention the %lc 0 bug.
* doc/glibc-functions/obstack_printf.texi: Likewise.
* doc/glibc-functions/obstack_vprintf.texi: Likewise.
* doc/glibc-functions/vasprintf.texi: Likewise.
* doc/posix-functions/dprintf.texi: Likewise.
* doc/posix-functions/fprintf.texi: Likewise.
* doc/posix-functions/printf.texi: Likewise.
* doc/posix-functions/snprintf.texi: Likewise.
* doc/posix-functions/sprintf.texi: Likewise.
* doc/posix-functions/vdprintf.texi: Likewise.
* doc/posix-functions/vfprintf.texi: Likewise.
* doc/posix-functions/vprintf.texi: Likewise.
* doc/posix-functions/vsnprintf.texi: Likewise.
* doc/posix-functions/vsprintf.texi: Likewise.
33 files changed: