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Make major improvements to stdio

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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
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29
libc/stdio/fseek.c
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@ -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);
}