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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
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23
libc/stdio/ftell.c
View file

@ -16,33 +16,14 @@
│ 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"
/**
* Returns current position of stream.
*
* @param stream is a non-null stream handle
* @returns current byte offset from beginning of file, or -1
* @returns current byte offset from beginning, or -1 w/ errno
*/
long ftell(FILE *f) {
int64_t pos;
if (f->fd != -1) {
if (f->beg && !f->end) {
f->writer(f);
}
if ((pos = lseek(f->fd, 0, SEEK_CUR)) != -1) {
f->state = 0;
f->beg = 0;
f->end = 0;
return pos;
} else {
f->state = errno == ESPIPE ? EBADF : errno;
return -1;
}
} else {
errno = f->state;
return -1;
}
return ftello(f);
}