mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-28 08:12:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make major improvements to stdio

Browse source 
Buffering now has optimal performance, bugs have been fixed, and some
missing apis have been introduced. This implementation is also now more
production worthy since it's less brittle now in terms of system errors.
That's going to help redbean since lua i/o is all based on stdio.

See #97
This commit is contained in:
Justine Tunney 2021-03-26 22:31:41 -07:00
parent 09bcfa23d5
commit da36e7e256
69 changed files with 1595 additions and 735 deletions
Download patch file Download diff file Expand all files Collapse all files

29
libc/stdio/fseek.c
View file

@ -16,10 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/o.h"
/**
* Repositions open file stream.
@ -32,28 +29,8 @@
* @param f is a non-null stream handle
* @param offset is the byte delta
* @param whence can be SEET_SET, SEEK_CUR, or SEEK_END
* @returns new offset or -1 on error
* @returns 0 on success or -1 on error
*/
long fseek(FILE *f, long offset, int whence) {
int64_t pos;
if (f->fd != -1) {
if (whence == SEEK_CUR && f->beg < f->end) {
offset -= f->end - f->beg;
}
if (f->beg && !f->end) {
f->writer(f);
}
if (lseek(f->fd, offset, whence) != -1) {
f->state = 0;
f->beg = 0;
f->end = 0;
return 0;
} else {
f->state = errno == ESPIPE ? EBADF : errno;
return -1;
}
} else {
f->beg = (offset & 0xffffffff) % f->size;
return -1;
}
int fseek(FILE *f, long offset, int whence) {
return fseeko(f, offset, whence);
}