usr/src/lib/libc/port/print/vprintf.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "lint.h"
  33 #include <mtlib.h>
  34 #include <stdarg.h>
  35 #include <errno.h>
  36 #include <thread.h>
  37 #include <values.h>
  38 #include <synch.h>
  39 #include <sys/types.h>
  40 #include "print.h"
  41 #include "libc.h"
  42 #include "mse.h"
  43
  44 /*VARARGS1*/
  45 int
  46 vprintf(const char *format, va_list ap)
  47 {
  48         ssize_t count;
  49         rmutex_t *lk;
  50
  51         /* Use F*LOCKFILE() macros because vprintf() is not async-safe. */
  52         FLOCKFILE(lk, stdout);
  53
  54         _SET_ORIENTATION_BYTE(stdout);
  55
  56         if (!(stdout->_flag & _IOWRT)) {
  57                 /* if no write flag */
  58                 if (stdout->_flag & _IORW) {
  59                         /* if ok, cause read-write */
  60                         stdout->_flag |= _IOWRT;
  61                 } else {
  62                         /* else error */
  63                         FUNLOCKFILE(lk);
  64                         errno = EBADF;
  65                         return (EOF);
  66                 }
  67         }
  68         count = _ndoprnt(format, ap, stdout, 0);
  69         /* check for error or EOF */
  70         if (FERROR(stdout) || count == EOF) {
  71                 FUNLOCKFILE(lk);
  72                 return (EOF);
  73         }
  74
  75         FUNLOCKFILE(lk);
  76
  77         /* check for overflow */
  78         if ((size_t)count > MAXINT) {
  79                 errno = EOVERFLOW;
  80                 return (EOF);
  81         } else {
  82                 return ((int)count);
  83         }
  84 }