May 24, 2010 · Behavior difference: strcpy stops when it encounters a NULL or '\0' Performance difference: memcpy is usually more efficient than strcpy, which always scan the data it copies Jun 11, 2018 · If you know both those, as you should, then strcpy() is merely wasteful; you could use memmove() — or memcpy() — to do the copying. The trouble is, people often use strcpy() where they don't know the sizes in advance, and that can lead to problems, but it is ultimately "careless coding causes crashes" rather than anything wrong with strcpy Oct 10, 2018 · 1 Answer. strcpy performs deep copy. It copies data contained in memory at address, which is equal to value of pointer, to memory at address, which is equal to second pointer. Assignment simply assigns second pointer value of the first pointer. Mind the fact that memory for strcpy to copy to must be allocated beforehand. Dec 28, 2022 · The main difference between strcpy and memcpy is that strcpy is specifically designed to copy strings, while memcpy can copy any type of data. strcpy copies the contents of a string from one memory location to another, including the null terminator at the end of the string. memcpy copies a specified number of bytes from one memory location to Jan 9, 2017 · I wanted to see if restrict would prevent memcpy from accessing overlapping memory. The memcpy function copies n bytes from memory area src to memory area dest directly. The memory areas should not overlap. memmove uses a buffer so there is no risk of overlapping memory. Feb 19, 2013 · memcpy (&profile.friendly_name, &string, 16); // Wrong! First of all, &string is wrong. It should be string, because string is a pointer to the string data you want to copy. If you copy &string, you will get a pointer and some random bits of stack data copied instead. In other words, you'll get garbage. Secondly, 16 is wrong. Sep 17, 2013 · Now you can do strcat, because the first character of 'stuff' is the null-terminator, so it will append to the right place. In C, you still need to initialize 'stuff', which can be done a couple of ways: char stuff [100]; // not initialized stuff [0] = '\0'; // first character is now the null terminator, // so 'stuff' is effectively "" strcpy 1BB3uI.

difference between memcpy and strcpy