diff options
Diffstat (limited to 'nuttx/libc/string/lib_memset.c')
| -rw-r--r-- | nuttx/libc/string/lib_memset.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/nuttx/libc/string/lib_memset.c b/nuttx/libc/string/lib_memset.c deleted file mode 100644 index 0b98ebf96..000000000 --- a/nuttx/libc/string/lib_memset.c +++ /dev/null @@ -1,188 +0,0 @@ - -/**************************************************************************** - * libc/string/lib_memset.c - * - * Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * 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. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * 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 OWNER 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. - * - ****************************************************************************/ - - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> - -#include <stdint.h> -#include <string.h> -#include <assert.h> - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/* Can't support CONFIG_MEMSET_64BIT if the platform does not have 64-bit - * integer types. - */ - -#ifndef CONFIG_HAVE_LONG_LONG -# undef CONFIG_MEMSET_64BIT -#endif - -/**************************************************************************** - * Global Functions - ****************************************************************************/ - -#ifndef CONFIG_ARCH_MEMSET -void *memset(void *s, int c, size_t n) -{ -#ifdef CONFIG_MEMSET_OPTSPEED - /* This version is optimized for speed (you could do better - * still by exploiting processor caching or memory burst - * knowledge.) - */ - - uintptr_t addr = (uintptr_t)s; - uint16_t val16 = ((uint16_t)c << 8) | (uint16_t)c; - uint32_t val32 = ((uint32_t)val16 << 16) | (uint32_t)val16; -#ifdef CONFIG_MEMSET_64BIT - uint64_t val64 = ((uint64_t)val32 << 32) | (uint64_t)val32; -#endif - - /* Make sure that there is something to be cleared */ - - if (n > 0) - { - /* Align to a 16-bit boundary */ - - if ((addr & 1) != 0) - { - *(uint8_t*)addr = (uint8_t)c; - addr += 1; - n -= 1; - } - - /* Check if there are at least 16-bits left to be written */ - - if (n >= 2) - { - /* Align to a 32-bit boundary (we know that the destination - * address is already aligned to at least a 16-bit boundary). - */ - - if ((addr & 3) != 0) - { - *(uint16_t*)addr = val16; - addr += 2; - n -= 2; - } - -#ifndef CONFIG_MEMSET_64BIT - /* Loop while there are at least 32-bits left to be written */ - - while (n >= 4) - { - *(uint32_t*)addr = val32; - addr += 4; - n -= 4; - } -#else - /* Check if there are at least 32-bits left to be written */ - - if (n >= 4) - { - /* Align to a 64-bit boundary (we know that the destination - * address is already aligned to at least a 32-bit boundary). - */ - - if ((addr & 7) != 0) - { - *(uint32_t*)addr = val32; - addr += 4; - n -= 4; - } - - /* Loop while there are at least 64-bits left to be written */ - - while (n >= 8) - { - *(uint64_t*)addr = val64; - addr += 8; - n -= 8; - } - } -#endif - } - -#ifdef CONFIG_MEMSET_64BIT - /* We may get here with n in the range 0..7. If n >= 4, then we should - * have 64-bit alignment. - */ - - if (n >= 4) - { - *(uint32_t*)addr = val32; - addr += 4; - n -= 4; - } -#endif - - /* We may get here under the following conditions: - * - * n = 0, addr may or may not be aligned - * n = 1, addr is aligned to at least a 16-bit boundary - * n = 2, addr is aligned to a 32-bit boundary - * n = 3, addr is aligned to a 32-bit boundary - */ - - if (n >= 2) - { - *(uint16_t*)addr = val16; - addr += 2; - n -= 2; - } - - if (n >= 1) - { - *(uint8_t*)addr = (uint8_t)c; - } - } -#else - /* This version is optimized for size */ - - unsigned char *p = (unsigned char*)s; - while (n-- > 0) *p++ = c; -#endif - return s; -} -#endif |