memcpy

/* // Implementation of the strcpy function. Note that the name must be different from that of the original database function # include # include # include using namespace STD; char * mystrcpy (char * strdest, const char * strsrc) {If (strdest =

Void * memcpy1 (void * DEST, const void * SRC, size_t N){Assert (DEST! = NULL & SRC! = NULL ); If (DEST = SRC)Return DEST;Else if (DEST {Const char * c_src = static_cast ; (SRC );Char * c_dest = static_cast ; (DEST );While (n --) * c_dest ++ = *

Without considering the possible duplication of objectives and source addresses, do you know if there is a faster way to do this without compiling the method? At least I can't think of anything at the moment:

1. /*** 2. * char * strcpy (DST, Src)-copy one string over another 3. * 4. * purpose: 5. * copies the string SRC into the spot specified by 6. * DEST; assumes enough room. 7. * 8. * entry: 9. * char * DST-string over which "src" is to be

#include #include "dmemcpy.h"#define DEF_OPT_FLAG_NONE 0#define DEF_OPT_FLAG_NOPT 1#define DEF_OPT_FLAG_MMX 5#define DEF_OPT_FLAG_SSE 6#define DEF_OPT_FLAG_SSE2 7static int opt_flag = DEF_OPT_FLAG_NONE;void * _memcpy(void *to, const void

GCC 4.4.6 compiled and tested # GCC fast_memcpy.c-O fast_memcpy #include #include /** * Copy 16 bytes from one location to another using optimised SSE * instructions. The locations should not overlap. * * @param s1 * Pointer to the destination of

The Code is as follows: Copy codeThe Code is as follows: // MemMove. cpp: defines the entry point of the console application. // # Include "stdafx. h" # Include Using namespace std; Copy codeThe Code is as follows: void * memmove (void * dest,

# Include int main (INT argc, const char * argv []) {unsigned char * c = NULL; C = (unsigned char *) malloc (15 ); unsigned char d [5] = {1, 2, 3, 4, 5}; unsigned char E [5] = {11, 22, 33,44, 55}; memcpy (c, d, sizeof (d); memcpy (C + 5, E, sizeof (

/* $ NetBSD: bcopy. c, V 1.6 20:24:12 Christos exp $ */... /* * Copy a block of memory, handling overlap. * This is the routine that actually implements * (the portable versions of) bcopy, memcpy, and memmove. */ # ifdef memcopy void * memcpy (

C ++ is the best way to promote brain death. Writing code is sometimes the most uncomfortable thing if faith breaks down, just like believing in religion. In my early years, I read an article about Optimization of memcpy by VC and Efficiency geek 2: copying data in C/C ++, optimisation. therefore, I firmly believe that it is difficult to write memcpy faster than the C Runtime Library. But there are two thin

Common Linux C functions-memory and string operations-general Linux technology-Linux programming and kernel information. For more information, see the following. Bcmp (memory content comparison) Related functions: bcmp, strcasecmp, strcmp, strcoll, strncmp, strncasecmp Header file # include Define the function int bcmp (const void * s1, const void * s2, int n ); Function Description: bcmp () is used to compare the first n bytes in the memory interval specified by s1 and s2. If the par

Bcmp (memory content comparison) Related functions: bcmp, strcasecmp, strcmp, strcoll, strncmp, strncasecmp Header file # include Define the function int bcmp (const void * S1, const void * S2, int N ); Function Description: bcmp () is used to compare the first n bytes in the memory interval specified by S1 and S2. If the parameter n is 0, 0 is returned. If the memory content of parameters S1 and S2 are identical, the return value is 0. Otherwise, the return value is non-zero. We recommend that

");}****************** ******/ Void RandomNum (){Int I;Srand (int) time (NULL ));For (I = 0; I RandArray [I] = (int) rand ();Return;} /*************************************** ***************/ Void InitLinkList (LinkList * L){Int I;Memset (L, 0, sizeof (LinkList ));RandomNum ();For (I = 0; I L-> Record [I]. num = RandArray [I];L-> Length = I;} Bool lt (int I, int j, int * CmpNum){(* CmpNum) ++;If (I Return FALSE;} Void Display (LinkList * L){FILE * f;Int I;If (f = fopen ("SortRes.txt", "w") = NU

********************************* *********");Getchar ();System ("cls.exe ");}****************** ******/Void randomnum (){Int I;Srand (INT) Time (null ));For (I = 0; I Randarray [I] = (INT) rand ();Return;}/*************************************** ***************/Void initlinklist (linklist * l){Int I;Memset (L, 0, sizeof (linklist ));Randomnum ();For (I = 0; I L-> record [I]. num = randarray [I];L-> length = I;}Bool LT (int I, Int J, int * cmpnum){(* Cmpnum) ++;If (I Return false;}Void display

, the void pointer can be assigned a value for any type of data, so the void pointer can also be used as a function parameter, in this way, the function can accept any data type pointer as a parameter. For example:Void * memcpy (void * DEST, const void * SRC, size_t Len );Void * memset (void * buffer, int C, size_t num ); ------------------------------------------------------------------------------ 1. Many beginners do not quite understand the void a

GPS decoding is actually very simple. Generally, if the GPS module is powered on, it will not stop sending packets. You can check the next few packets to understand it. For more information, see the NMEA protocol. Most useful packages are strings starting with $ uplmc. Replace the UTC time plus 8 with the UTC time in the UTC time zone, and then replace the latitude and longitude speed, the height, and other turtles in the zone with memcpy! For more

Memory and String functions 1) bcmp Compare memory contentsCorrelation function bcmp,strcasecmp,strcmp,strcoll,strncmp,strncasecmpTable header file #include Defines the function int bcmp (const void *s1,const void * s2,int N);The function Description bcmp () is used to compare the first n bytes of the memory interval referred to by S1 and S2, or 0 if the parameter n is 0.Return value returns a value of 0 if the contents of the memory referred to by the parameter S1 and S2 are identical, otherwis

"my_img_arm"# Define group_devide_flag "|"# Define str_tail "at91rm"# Define name_len strlen (gh_dbname)Typedef struct{Unsigned short ID; // command IDChar parameter1; // parameter1Char parameter2; // parameter2Char parameter3; // parameter3Char parameter4; // parameter4} _ Comedia_cmd;// _ Comedia_cmd;_ Comedia_cmd comedia_cmd2;Typedef struct{Unsigned short ID;Unsigned short datasize;Char data [506];Unsigned short verifycode;} _ PKG;_ PKG;_ PKG pkg2;# Pragma pack (1)Typedef struct{Char bufhead

"my_img_arm"# Define group_devide_flag "|"# Define str_tail "at91rm"# Define name_len strlen (gh_dbname)Typedef struct{Unsigned short ID; // command IDChar parameter1; // parameter1Char parameter2; // parameter2Char parameter3; // parameter3Char parameter4; // parameter4} _ Comedia_cmd;// _ Comedia_cmd;_ Comedia_cmd comedia_cmd2;Typedef struct{Unsigned short ID;Unsigned short datasize;Char data [506];Unsigned short verifycode;} _ PKG;_ PKG;_ PKG pkg2;# Pragma pack (1)Typedef struct{Char bufhead

strcpy and memcpy are standard C library functions that have the following characteristics. strcpy provides a copy of the string. That is, strcpy is used only for string copying, and it also copies the end character of the string, not just the string content. MEMCPY provides a common memory copy. That is, memcpy has no limitations on what needs to be replicated