root/user/lib/libc/stdio/printf.c

DEFINITIONS

1. __printf_send
2. printf
3. vprintf

   1 /*
   2  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
   3  *      The President and Fellows of Harvard College.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <stdio.h>
  31 #include <stdarg.h>
  33 /*
  34  * printf - C standard I/O function.
  35  */
  38 /*
  39  * Function passed to __vprintf to do the actual output.
  40  */
  41 static
  42 void
__printf_send(void *mydata, const char *data, size_t len)
  44 {
  45         unsigned i;
  46         (void)mydata;  /* not needed */
  48         for (i=0; i<len; i++) {
putchar(data[i]);
  50         }
  51 }
  53 /* printf: hand off to vprintf */
  54 int
printf(const char *fmt, ...)
  56 {
  57         int chars;
va_list ap;
va_start(ap, fmt);
chars = vprintf(fmt, ap);
va_end(ap);
  62         return chars;
  63 }
  65 /* vprintf: call __vprintf to do the work. */
  66 int
vprintf(const char *fmt, va_list ap)
  68 {
  69         return __vprintf(__printf_send, NULL, fmt, ap);
  70 }