when you realloc to a smaller size, most implementations modify the memory immediately following the shortened block; reallocing back to the original size will have some garbage in the added part, it won't be what it was before it was shrunk. In some implementations, some block...
realloc() automatically frees the original memory, or returns it unchanged (aside from metadata) if you realloc() to a smaller size or there is unallocated memory available to simply expand the original allocation in place. shareimprove this answer answered Mar 24 '11 at 23:14 geekosaur28.4...
如果是缩小内存,则释放malloc的,不释放realloc的, realloc()automatically frees the original memory, or returns it unchanged (aside from metadata) if yourealloc()to a smaller size or there is unallocated memory available to simply expand the original allocation in place....
*/ newmem = public_mALLOc(bytes); if (newmem == 0) return 0; /* propagate failure */ MALLOC_COPY(newmem, oldmem, oldsize - 2*SIZE_SZ); munmap_chunk(oldp); return newmem; } (Linux has mremap(), so in practice this is what is done).For smaller requests, a few lines below we...
realloc Syntax: #include <stdlib.h> void *realloc( void *ptr, size_t size ); The realloc() function changes the size of the object pointed to by ptr to the given size. size can be any size, larger or smaller than the original. The return value is a pointer to the new space, or...
A call to realloc() will return NULL on error and the original memory is left untouched, both when requesting a larger or a smaller size that the original, right? But a call to realloc() with size set to zero is equivalent to free(), with returns void. Does that mean that a call ...
SSL libraries: libssl.so libcrypto.so Loaded 196109 LoTW users Loaded 216982 eQSL users realloc(): invalid next size Aborted (core dumped) Game over... Sorry, I've no clue how to deal with that. Any hints? 73 Andy DK9HE
if size is equal to zero, and ptr is not NULL, then the call is equivalent to free(ptr) I am sending in a string like "hmset aa bb cc" (a longer one). I will try to write a smaller program that can reproduce it, but I am not sure if I will be able to consistently reporo...
If the function succeeds, the function returns a pointer to the reallocated block of memory.If the function fails, it returns NULL.RemarksThe existing contents of the memory block are copied to the reallocated block. If the size of the reallocated block of memory is smaller than the size of...
size:The new size (in bytes) for the memory block. It can be larger or smaller than the original size. If size is zero, the memory is freed. Example: Expanding a dynamically allocated array Code: #include <stdio.h> #include <stdlib.h> ...