diff options
| author | Rich Felker <dalias@aerifal.cx> | 2011-09-04 00:08:32 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-09-04 00:08:32 -0400 |
| commit | c88f36f55623124d09f48631974ca38aaec00057 (patch) | |
| tree | 3d205e48775df6e9b13f2e765267facf12553bd5 /src/stdio | |
| parent | 32d67e938e8da0f37c59247acee8b10eaf9a113c (diff) | |
| download | musl-c88f36f55623124d09f48631974ca38aaec00057.tar.gz musl-c88f36f55623124d09f48631974ca38aaec00057.tar.bz2 musl-c88f36f55623124d09f48631974ca38aaec00057.tar.xz musl-c88f36f55623124d09f48631974ca38aaec00057.zip | |
optimize seek function for memory streams
Diffstat (limited to 'src/stdio')
| -rw-r--r-- | src/stdio/open_memstream.c | 15 | ||||
| -rw-r--r-- | src/stdio/open_wmemstream.c | 15 |
2 files changed, 6 insertions, 24 deletions
diff --git a/src/stdio/open_memstream.c b/src/stdio/open_memstream.c index 57737098..7fc16204 100644 --- a/src/stdio/open_memstream.c +++ b/src/stdio/open_memstream.c @@ -13,21 +13,12 @@ static off_t ms_seek(FILE *f, off_t off, int whence) { ssize_t base; struct cookie *c = f->cookie; - switch (whence) { - case SEEK_SET: - base = 0; - break; - case SEEK_CUR: - base = c->pos; - break; - case SEEK_END: - base = c->len; - break; - default: - fail: + if (whence>2U) { +fail: errno = EINVAL; return -1; } + base = (size_t [3]){0, c->pos, c->len}[whence]; if (off < -base || off > SSIZE_MAX-base) goto fail; return c->pos = base+off; } diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c index 41b92d21..0db77416 100644 --- a/src/stdio/open_wmemstream.c +++ b/src/stdio/open_wmemstream.c @@ -14,21 +14,12 @@ static off_t wms_seek(FILE *f, off_t off, int whence) { ssize_t base; struct cookie *c = f->cookie; - switch (whence) { - case SEEK_SET: - base = 0; - break; - case SEEK_CUR: - base = c->pos; - break; - case SEEK_END: - base = c->len; - break; - default: - fail: + if (whence>2U) { +fail: errno = EINVAL; return -1; } + base = (size_t [3]){0, c->pos, c->len}[whence]; if (off < -base || off > SSIZE_MAX/4-base) goto fail; memset(&c->mbs, 0, sizeof c->mbs); return c->pos = base+off; |