81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2015
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <kern/secret.h>
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/*
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* printf - C standard I/O function.
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*/
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/*
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* Function passed to __vprintf to do the actual output.
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*/
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static
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void
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__printf_send(void *mydata, const char *data, size_t len)
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{
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ssize_t ret;
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int *err = mydata;
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ret = write(STDOUT_FILENO, data, len);
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*err = (ret == -1) ? errno : 0;
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}
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/* printf: hand off to vprintf */
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int
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printf(const char *fmt, ...)
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{
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int chars;
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va_list ap;
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va_start(ap, fmt);
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chars = vprintf(fmt, ap);
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va_end(ap);
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return chars;
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}
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/* vprintf: call __vprintf to do the work. */
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int
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vprintf(const char *fmt, va_list ap)
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{
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int chars, err;
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chars = __vprintf(__printf_send, &err, fmt, ap);
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if (err) {
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errno = err;
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return -1;
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}
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return chars;
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}
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