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authorRich Felker <dalias@aerifal.cx>2011-09-04 00:08:32 -0400
committerRich Felker <dalias@aerifal.cx>2011-09-04 00:08:32 -0400
commitc88f36f55623124d09f48631974ca38aaec00057 (patch)
tree3d205e48775df6e9b13f2e765267facf12553bd5 /src/stdio
parent32d67e938e8da0f37c59247acee8b10eaf9a113c (diff)
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optimize seek function for memory streams
Diffstat (limited to 'src/stdio')
-rw-r--r--src/stdio/open_memstream.c15
-rw-r--r--src/stdio/open_wmemstream.c15
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;