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optimize seek function for memory streams
[musl]
/
src
/
stdio
/
open_wmemstream.c
diff --git
a/src/stdio/open_wmemstream.c
b/src/stdio/open_wmemstream.c
index
41b92d2
..
0db7741
100644
(file)
--- 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;
{
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;
}
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;
if (off < -base || off > SSIZE_MAX/4-base) goto fail;
memset(&c->mbs, 0, sizeof c->mbs);
return c->pos = base+off;