| 0,0 → 1,164 |
|---|
| /* |
| * Copyright (c) 2001-2004 Jakub Jermar |
| * Copyright (c) 2008 Jiri Svoboda |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - 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. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| */ |
| |
| /** @addtogroup generic |
| * @{ |
| */ |
| |
| /** |
| * @file |
| * @brief Memory string operations. |
| * |
| * This file provides architecture independent functions to manipulate blocks of |
| * memory. These functions are optimized as much as generic functions of this |
| * type can be. However, architectures are free to provide even more optimized |
| * versions of these functions. |
| */ |
| |
| #include <memstr.h> |
| #include <arch/types.h> |
| #include <align.h> |
| |
| /** Copy block of memory. |
| * |
| * Copy cnt bytes from src address to dst address. The copying is done |
| * word-by-word and then byte-by-byte. The source and destination memory areas |
| * cannot overlap. |
| * |
| * @param src Source address to copy from. |
| * @param dst Destination address to copy to. |
| * @param cnt Number of bytes to copy. |
| * |
| * @return Destination address. |
| */ |
| void *_memcpy(void *dst, const void *src, size_t cnt) |
| { |
| unsigned int i, j; |
| |
| if (ALIGN_UP((uintptr_t) src, sizeof(unative_t)) != (uintptr_t) src || |
| ALIGN_UP((uintptr_t) dst, sizeof(unative_t)) != (uintptr_t) dst) { |
| for (i = 0; i < cnt; i++) |
| ((uint8_t *) dst)[i] = ((uint8_t *) src)[i]; |
| } else { |
| for (i = 0; i < cnt / sizeof(unative_t); i++) |
| ((unative_t *) dst)[i] = ((unative_t *) src)[i]; |
| |
| for (j = 0; j < cnt % sizeof(unative_t); j++) |
| ((uint8_t *)(((unative_t *) dst) + i))[j] = |
| ((uint8_t *)(((unative_t *) src) + i))[j]; |
| } |
| |
| return (char *) dst; |
| } |
| |
| /** Move memory block with possible overlapping. |
| * |
| * Copy cnt bytes from src address to dst address. The source and destination |
| * memory areas may overlap. |
| * |
| * @param src Source address to copy from. |
| * @param dst Destination address to copy to. |
| * @param cnt Number of bytes to copy. |
| * |
| * @return Destination address. |
| */ |
| void *memmove(void *dst, const void *src, size_t n) |
| { |
| const uint8_t *sp; |
| uint8_t *dp; |
| |
| /* Nothing to do? */ |
| if (src == dst) |
| return dst; |
| |
| /* Non-overlapping? */ |
| if (dst >= src + n || src >= dst + n) { |
| return memcpy(dst, src, n); |
| } |
| |
| /* Which direction? */ |
| if (src > dst) { |
| /* Forwards. */ |
| sp = src; |
| dp = dst; |
| |
| while (n-- != 0) |
| *dp++ = *sp++; |
| } else { |
| /* Backwards. */ |
| sp = src + (n - 1); |
| dp = dst + (n - 1); |
| |
| while (n-- != 0) |
| *dp-- = *sp--; |
| } |
| |
| return dst; |
| } |
| |
| /** Fill block of memory |
| * |
| * Fill cnt bytes at dst address with the value x. The filling is done |
| * byte-by-byte. |
| * |
| * @param dst Destination address to fill. |
| * @param cnt Number of bytes to fill. |
| * @param x Value to fill. |
| * |
| */ |
| void _memsetb(void *dst, size_t cnt, uint8_t x) |
| { |
| unsigned int i; |
| uint8_t *p = (uint8_t *) dst; |
| |
| for (i = 0; i < cnt; i++) |
| p[i] = x; |
| } |
| |
| /** Fill block of memory. |
| * |
| * Fill cnt words at dst address with the value x. The filling is done |
| * word-by-word. |
| * |
| * @param dst Destination address to fill. |
| * @param cnt Number of words to fill. |
| * @param x Value to fill. |
| * |
| */ |
| void _memsetw(void *dst, size_t cnt, uint16_t x) |
| { |
| unsigned int i; |
| uint16_t *p = (uint16_t *) dst; |
| |
| for (i = 0; i < cnt; i++) |
| p[i] = x; |
| } |
| |
| /** @} |
| */ |