usr/src/lib/libc/port/print/vsprintf.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 <values.h>
  36 #include <errno.h>
  37 #include <synch.h>
  38 #include <thread.h>
  39 #include <sys/types.h>
  40 #include "print.h"
  41 #include "libc.h"
  42
  43 /*
  44  * 32-bit shadow function of vsprintf() is included here.
  45  * When using the c89 compiler to build 32-bit applications, the size
  46  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
  47  * The shadow function uses 32-bit size of intmax_t for %j conversion.
  48  * The #pragma redefine_extname in <stdio.h> selects the proper routine
  49  * at compile time for the user application.
  50  * NOTE: this function is only available in the 32-bit library.
  51  */
  52
  53 /*VARARGS2*/
  54 int
  55 #ifdef _C89_INTMAX32
  56 _vsprintf_c89(char *string, const char *format, va_list ap)
  57 #else
  58 vsprintf(char *string, const char *format, va_list ap)
  59 #endif
  60 {
  61         ssize_t count;
  62         FILE siop;
  63
  64         siop._cnt = MAXINT;
  65         siop._base = siop._ptr = (unsigned char *)string;
  66         siop._flag = _IOREAD; /* distinguish dummy file descriptor */
  67 #ifdef _C89_INTMAX32
  68         count = _ndoprnt(format, ap, &siop, _F_INTMAX32);
  69 #else
  70         count = _ndoprnt(format, ap, &siop, 0);
  71 #endif
  72         *siop._ptr = '\0'; /* plant terminating null character */
  73
  74         if (count == EOF) {
  75                 return (EOF);
  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 }