{
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;
}
- if (-off > base || off > SSIZE_MAX/4-base) goto fail;
+ 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;
}
struct cookie *c = f->cookie;
size_t len2;
wchar_t *newbuf;
- if (len > c->space - c->pos) {
- len2 = 2*c->space+1 | c->space+len+1;
+ if (len + c->pos >= c->space) {
+ len2 = 2*c->space+1 | c->pos+len+1;
if (len2 > SSIZE_MAX/4) return 0;
newbuf = realloc(c->buf, len2*4);
if (!newbuf) return 0;
*c->bufp = c->buf = newbuf;
- memset(c->buf + c->space, 0, len2 - c->space);
+ memset(c->buf + c->space, 0, 4*(len2 - c->space));
c->space = len2;
}