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62 lines
2.8 KiB
62 lines
2.8 KiB
/*-*- 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/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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