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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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33
libc/stdio/fputc.c
View file

@ -17,33 +17,22 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/stdio/internal.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/o.h"
/**
* Writes byte to stream.
* @return c (as unsigned char) if written or -1 w/ errno
* @see putc() if called within loop
*
* @param c is byte to buffer or write, which is masked
* @return c as unsigned char if written or -1 w/ errno
*/
noinstrument int fputc(int c, FILE *f) {
if ((f->iomode & O_ACCMODE) != O_RDONLY) {
if (f->beg < f->size) {
f->buf[f->beg++] = c;
if (f->beg == f->size || f->bufmode == _IONBF ||
(f->bufmode == _IOLBF && c == '\n')) {
if (f->writer) {
if (f->writer(f) == -1) return -1;
} else if (f->beg == f->size) {
f->beg = 0;
}
}
return c & 0xff;
} else {
return __fseteof(f);
}
int fputc(int c, FILE *f) {
unsigned char b;
if (c != '\n' && f->beg < f->size && f->bufmode != _IONBF) {
f->buf[f->beg++] = c;
return c & 0xff;
} else {
return __fseterr(f, EBADF);
b = c;
if (!fwrite(&b, 1, 1, f)) return -1;
return b;
}
}