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- --- a/gnu/vasnprintf.c
- +++ b/gnu/vasnprintf.c
- @@ -4858,7 +4858,11 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *
- #endif
- *fbp = dp->conversion;
- #if USE_SNPRINTF
- -# if !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
- +# if ! (((__GLIBC__ > 2 \
- + || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) \
- + && !defined __UCLIBC__) \
- + || (defined __APPLE__ && defined __MACH__) \
- + || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
- fbp[1] = '%';
- fbp[2] = 'n';
- fbp[3] = '\0';
- @@ -4872,6 +4876,9 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *
- in format strings in writable memory may crash the program
- (if compiled with _FORTIFY_SOURCE=2), so we should avoid it
- in this situation. */
- + /* macOS 10.13 High Sierra behaves like glibc with
- + _FORTIFY_SOURCE=2, and older macOS releases
- + presumably do not need %n. */
- /* On native Windows systems (such as mingw), we can avoid using
- %n because:
- - Although the gl_SNPRINTF_TRUNCATION_C99 test fails,
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