mirror of
https://github.com/jart/cosmopolitan.git
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62 lines
2.7 KiB
C
62 lines
2.7 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/fmt/fmt.h"
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#include "libc/limits.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/errfuns.h"
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struct state {
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FILE *f;
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int n;
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};
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static int vfprintfputchar(const char *s, struct state *t, size_t n) {
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int rc;
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if (n) {
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if (n == 1 && *s != '\n' && t->f->beg < t->f->size &&
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t->f->bufmode != _IONBF) {
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t->f->buf[t->f->beg++] = *s;
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t->n += n;
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rc = 0;
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} else if (!fwrite_unlocked(s, 1, n, t->f)) {
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rc = -1;
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} else {
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t->n += n;
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rc = 0;
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}
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} else {
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rc = 0;
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}
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return 0;
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}
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/**
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* Formats and writes text to stream.
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* @see printf() for further documentation
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*/
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int(vfprintf_unlocked)(FILE *f, const char *fmt, va_list va) {
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int rc;
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struct state st[1] = {{f, 0}};
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if ((rc = __fmt(vfprintfputchar, st, fmt, va)) != -1) {
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rc = st->n;
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}
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return rc;
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}
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