ucx: src/cx/utils.h@929016224c3c (annotated)

src/cx/utils.h@929016224c3c (annotated)

src/cx/utils.h

Mon, 27 Dec 2021 16:51:10 +0100

author: Mike Becker <universe@uap-core.de>
date: Mon, 27 Dec 2021 16:51:10 +0100
changeset 483: 929016224c3c
child 509: 0d3c6075f82c
permissions: -rw-r--r--

add ported UCX buffer implementation

Notes:
* ucx_buffer_extend has been removed
in favor of cxBufferMinimumCapacity
* the buffer struct now has a union for
char* and unsigned char* buffers

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 /**
  * \file utils.h
  *
  * \brief General purpose utility functions.
  *
  * \author Mike Becker
  * \author Olaf Wintermann
  * \version 3.0
  * \copyright 2-Clause BSD License
  */
 #ifndef UCX_UTILS_H
 #define UCX_UTILS_H
 #include "common.h"
 #ifdef __cplusplus
 extern "C" {
 #endif
 /* ----------------------
  * cx_szmul() definition.
  * ---------------------- */
 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN)
 #define CX_SZMUL_BUILTIN
 #if __WORDSIZE == 32
 /**
  * Alias for \c __builtin_umul_overflow.
  *
  * Performs a multiplication of size_t values and checks for overflow.
  *
  * @param a first operand
  * @param b second operand
  * @param result a pointer to a size_t, where the result should
  * be stored
  * @return zero, if no overflow occurred and the result is correct, non-zero
  * otherwise
  */
 #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result)
 #else /* __WORDSIZE != 32 */
 /**
  * Alias for \c __builtin_umull_overflow.
  *
  * Performs a multiplication of size_t values and checks for overflow.
  *
  * @param a first operand
  * @param b second operand
  * @param result a pointer to a size_t, where the result should
  * be stored
  * @return zero, if no overflow occurred and the result is correct, non-zero
  * otherwise
  */
 #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result)
 #endif /* __WORDSIZE */
 #else /* no GNUC or clang bultin */
 /**
  * Performs a multiplication of size_t values and checks for overflow.
   *
  * @param a first operand
  * @param b second operand
  * @param result a pointer to a size_t, where the result should
  * be stored
  * @return zero, if no overflow occurred and the result is correct, non-zero
  * otherwise
  */
 #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result)
 /**
  * Performs a multiplication of size_t values and checks for overflow.
  *
  * This is a custom implementation in case there is no compiler builtin
  * available.
  *
  * @param a first operand
  * @param b second operand
  * @param result a pointer to a size_t where the result should be stored
  * @return zero, if no overflow occurred and the result is correct, non-zero
  * otherwise
  */
 int cx_szmul_impl(size_t a, size_t b, size_t *result);
 #endif
 #ifdef __cplusplus
 }
 #endif
 #endif /* UCX_UTILS_H */

Mercurial > hg > ucx / annotate

src/cx/utils.h@929016224c3c (annotated)

src/cx/utils.h