libcsupport/src/calloc.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Allocate Space for Array in Memory
0007  *  @ingroup libcsupport
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-2014.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #if defined(RTEMS_NEWLIB) && !defined(HAVE_CALLOC)
0041 #include <stdlib.h>
0042
0043 #include <errno.h>
0044 #include <string.h>
0045
0046 #include <rtems/score/basedefs.h>
0047
0048 void *calloc(
0049   size_t nelem,
0050   size_t elsize
0051 )
0052 {
0053   void   *cptr;
0054   size_t  length;
0055
0056   if ( nelem == 0 ) {
0057     return NULL;
0058   }
0059
0060   if ( elsize > SIZE_MAX / nelem ) {
0061     errno = ENOMEM;
0062     return NULL;
0063   }
0064
0065   length = nelem * elsize;
0066   cptr = malloc( length );
0067   RTEMS_OBFUSCATE_VARIABLE( cptr );
0068   if ( RTEMS_PREDICT_FALSE( cptr == NULL ) ) {
0069     return cptr;
0070   }
0071
0072   return memset( cptr, 0, length );
0073 }
0074 #endif