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| author | Rich Felker <dalias@aerifal.cx> | 2014-07-01 18:27:19 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2014-07-01 18:27:19 -0400 |
| commit | e89cfe51d2001af08fc2a13e5133ba8157f90beb (patch) | |
| tree | dbb44c888d9c0933b4006123f5d5b3c42689e026 /src/multibyte/mbrtowc.c | |
| parent | 2d8cc92a7cb4a3256ed07d86843388ffd8a882b1 (diff) | |
| download | musl-e89cfe51d2001af08fc2a13e5133ba8157f90beb.tar.gz musl-e89cfe51d2001af08fc2a13e5133ba8157f90beb.tar.xz musl-e89cfe51d2001af08fc2a13e5133ba8157f90beb.zip | |
fix aliasing violations in mbtowc and mbrtowc
these functions were setting wc to point to wchar_t aliasing itself as a "cheap" way to support null wc arguments. doing so was anything but cheap, since even without the aliasing violation, it would limit the compiler's ability to optimize. making wc point to a dummy object is equally easy and does not suffer from the above problems.
Diffstat (limited to 'src/multibyte/mbrtowc.c')
| -rw-r--r-- | src/multibyte/mbrtowc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c index 35e834ee..e7b36540 100644 --- a/src/multibyte/mbrtowc.c +++ b/src/multibyte/mbrtowc.c @@ -14,6 +14,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate unsigned c; const unsigned char *s = (const void *)src; const unsigned N = n; + wchar_t dummy; if (!st) st = (void *)&internal_state; c = *(unsigned *)st; @@ -21,7 +22,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate if (!s) { if (c) goto ilseq; return 0; - } else if (!wc) wc = (void *)&wc; + } else if (!wc) wc = &dummy; if (!n) return -2; if (!c) { |