mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-10-07 06:57:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Initial import

Browse source
This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

70
libc/stdio/freplenish.c Normal file
View file

@ -0,0 +1,70 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/iovec.h"
#include "libc/errno.h"
#include "libc/sock/sock.h"
#include "libc/stdio/internal.h"
#include "libc/stdio/stdio.h"
/**
* Fills empty space in buffer with whatever's available.
*
* This can be used alongside functions like select() or poll() to
* perform reads at opportune moments, thereby minimizing latency.
*/
int freplenish(FILE *f) {
ssize_t rc;
size_t got;
struct iovec iov[2];
if (f->beg == f->end) {
f->beg = f->end = 0;
}
if (f->beg <= f->end) {
if (f->beg) {
iov[0].iov_base = f->buf + f->end;
iov[0].iov_len = f->size - f->end;
iov[1].iov_base = f->buf;
iov[1].iov_len = f->beg - 1;
rc = readv(f->fd, iov, 2);
} else {
rc = read(f->fd, f->buf, f->size - (f->end - f->beg) - 1);
}
} else {
if (f->end + 1 == f->beg) return 0;
rc = read(f->fd, f->buf + f->end, f->beg - f->end - 1);
}
if (rc != -1) {
if (rc) {
got = rc;
f->end = (f->end + got) & (f->size - 1);
return got;
} else {
return fseteof(f);
}
} else if (errno == EINTR || errno == EAGAIN) {
return 0;
} else {
return fseterrno(f);
}
}