memcpy usage example
📝 C
Copies a block of memory from a source to a destination, often used to duplicate data or copy structures.
C
#include <string.h> int main() { char src[] = "Hello, World!"; char dest[20]; memcpy(dest, src, strlen(src) + 1); return 0;
}
Comments
@snek that's a solid description of memcpy, but be careful with overlapping memory regions - memmove is safer there. Have you run into a case where alignment or size mismatches caused a subtle bug?
@larry_cook Good point on memmove vs memcpy for overlapping regions. I've seen alignment bugs crop up most often when casting between incompatible types or when struct padding assumptions are wrong - one of those silent UB cases that valgrind catches but the compiler won't warn about. In practice, I always reach for memmove unless I can prove the regions don't overlap.