strcpy v/s memcpy

Posted by Sachin Chourasiya on Stack Overflow See other posts from Stack Overflow or by Sachin Chourasiya
Published on 2010-05-24T16:09:10Z Indexed on 2010/05/24 16:11 UTC
Read the original article Hit count: 592

Filed under:

memcpy

|

strcpy

What is the difference between memcpy() and strcpy()? I tried to find it with the help of a program but both are giving the same output.

int main()
{
    char s[5]={'s','a','\0','c','h'};
    char p[5];
    char t[5];
    strcpy(p,s);
    memcpy(t,s,5);
    printf("sachin p is [%s], t is [%s]",p,t);
    return 0;
}

Output

sachin p is [sa], t is [sa]

© Stack Overflow or respective owner

Related posts about memcpy

memcpy segmentation fault on linux but not os x

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm working on implementing a log based file system for a file as a class project. I have a good amount of it working on my 64 bit OS X laptop, but when I try to run the code on the CS department's 32 bit linux machines, I get a seg fault. The API we're given allows writing DISK_SECTOR_SIZE (512)… >>> More
Using memcpy to copy managed structures

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am working in mixed mode (managed C++ and C++ in one assembly). I am in a situation something like this. ManagedStructure ^ managedStructure = gcnew ManagedStructure(); //here i set different properties of managedStructure then I call "Method" given below and pass it "& managedStructure" Method(void… >>> More
memcpy vs assignment in C

as seen on Stack Overflow - Search for 'Stack Overflow'
Under what circumstances should I expect memcpys to outperform assignments on modern INTEL/AMD hardware? I am using GCC 4.2.x on a 32 bit Intel platform (but am interested in 64 bit as well). >>> More
ReadProcessMemory to memcpy conversion. Need help

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using: ReadProcessMemory(hProcess,(PVOID)(dwEngine_DLL+0x2E15C8+i),&memSnap[i],1,NULL); //Store the memory into a byte array To store a section of memory into an array of byte, but I realized this was sloppy since I'm in the same address space, but I'm not sure how to do the same thing… >>> More
memcpy(), what should the value of the size parameter be?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I want to copy an int array to another int array. They use the same define for length so they'll always be of the same length. What are the pros/cons of the following two alternatives of the size parameter to memcpy()? memcpy(dst, src, ARRAY_LENGTH*sizeof(int)); or memcpy(dst, src, sizeof(dst); Will… >>> More

Related posts about strcpy

Strcpy() corrupts the copied string in Solaris but not Linux

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I'm writing a C code for a class. This class requires that our code compile and run on the school server, which is a sparc solaris machine. I'm running Linux x64. I have this line to parse (THIS IS NOT ACTUAL CODE BUT IS INPUT TO MY PROGRAM): while ( cond1 ){ I need to capture the "while"… >>> More
'strcpy' error and warning

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm getting a 'strcpy' error and warning for the following lines: _tcscpy(strCommandLine,_T("MyProgram.exe /param1")); _tcscpy(strApplicationName,_T("MyProgram.exe")); Not sure why I'm getting a 'strcpy' error or warning since I'm not using 'strcpy'. The only lines related to this is: LPCTSTR… >>> More
Segmentation fault in strcpy

as seen on Stack Overflow - Search for 'Stack Overflow'
consider the program below char str[5]; strcpy(str,"Hello12345678"); printf("%s",str); When run this program gives segmentation fault. But when strcpy is replaced with following, program runs fine. strcpy(str,"Hello1234567"); So question is it should crash when trying to copy to… >>> More
snprintf vs strcpy(etc) in c

as seen on Stack Overflow - Search for 'Stack Overflow'
For doing string concatenation I've been doing basic strcpy,strncpy of char* buffers. Then I learned about the snprintf and friends. Should I stick with my strcpy,strcpy + \0 terminiation. Or should I just use snprintf in the future? thanks >>> More
Strcpy and malloc issues

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, i am having trouble getting a method relating to a linked list working, i get the errors: assignment makes pointer from integer without a cast and passing argument 1 of âstrcpyâ makes pointer from integer without a cast. i have tried to include all the relevant code, but let me know if you need… >>> More