64 lines
2.9 KiB
C
64 lines
2.9 KiB
C
/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/fmt/fmt.h"
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#include "libc/limits.h"
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#include "libc/macros.h"
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#include "libc/nt/files.h"
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#include "libc/sysv/errfuns.h"
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struct VdprintfState {
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int n;
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int fd;
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unsigned char buf[1024];
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};
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static int vdprintf_flush(struct VdprintfState *df, int n) {
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int i, rc;
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for (i = 0; i < n; i += rc) {
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if ((rc = write(df->fd, df->buf + i, n - i)) == -1) {
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return -1;
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}
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}
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return 0;
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}
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static int vdprintfputchar(int c, struct VdprintfState *df) {
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df->buf[df->n++ & (ARRAYLEN(df->buf) - 1)] = c & 0xff;
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if ((df->n & (ARRAYLEN(df->buf) - 1))) {
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return 0;
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} else {
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return vdprintf_flush(df, ARRAYLEN(df->buf));
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}
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}
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/**
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* Formats string directly to system i/o device.
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*/
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int(vdprintf)(int fd, const char *fmt, va_list va) {
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struct VdprintfState df;
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df.n = 0;
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df.fd = fd;
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if (palandprintf(vdprintfputchar, &df, fmt, va) == -1) return -1;
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if (vdprintf_flush(&df, df.n & (ARRAYLEN(df.buf) - 1)) == -1) return -1;
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return df.n;
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}
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