66 lines
3.0 KiB
C
66 lines
3.0 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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│ 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/nt/files.h"
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#include "libc/sysv/errfuns.h"
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#define DBUFSIZ 1460 /* tcp ethernet frame < -Wframe-larger-than=4096 */
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struct dfile {
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int fd;
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unsigned idx;
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unsigned toto;
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unsigned char buf[DBUFSIZ];
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};
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static int vdprintf_flush(struct dfile *df) {
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ssize_t wrote;
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do {
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wrote = write(df->fd, &df->buf[0], df->idx);
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if (wrote == -1) return -1;
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df->toto += (unsigned)wrote;
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df->idx -= (unsigned)wrote;
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if (df->toto > INT_MAX) return eoverflow();
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} while (df->idx);
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return 0;
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}
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static int vdprintfputchar(unsigned char c, struct dfile *df) {
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df->buf[df->idx++] = c;
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if (df->idx == DBUFSIZ && vdprintf_flush(df) == -1) return -1;
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return 0;
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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 dfile df;
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df.fd = fd;
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df.idx = 0;
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df.toto = 0;
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if (palandprintf(vdprintfputchar, &df, fmt, va) == -1) return -1;
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if (df.idx && vdprintf_flush(&df) == -1) return -1;
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return df.toto;
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}
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