Malloc to void pointer fails Post: 302906601

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Top Forums Programming Malloc to void pointer fails Post 302906601 by lsatenstein on Saturday 21st of June 2014 08:08:18 AM

06-21-2014

Registered User

When wanting to provide an address to a called pointer

Your code crashes because you are passing the address that "name" is pointing to
which is null.

So what you must do is pass the address of name as

int ConvertIDToName(void *id, void *&name, size_t *size) { int status = 0; unsigned char *xIDname = "user4.microsoft.com"; *name = (unsigned char*)malloc(30); /* this will work with the change */ memcpy(*name, xIDName, *size); ... return(0); }

---------- Post updated at 08:08 AM ---------- Previous update was at 08:05 AM ----------

int ConvertIDToName(void *id, void *&name, size_t *size) { int status = 0; unsigned char *xIDname = "user4.microsoft.com"; *name = (unsigned char*)malloc(30); memcpy(*name, xIDName, *size); ... return(0); }

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LEARN ABOUT DEBIAN

reallocf

MALLOC(3)						   BSD Library Functions Manual 						 MALLOC(3)

NAME

     reallocf -- general purpose memory allocation functions

LIBRARY

     Utility functions from BSD systems (libbsd, -lbsd)

SYNOPSIS

     #include <bsd/stdlib.h>

     void *
     reallocf(void *ptr, size_t size);

DESCRIPTION

     The reallocf() function changes the size of the previously allocated memory referenced by ptr to size bytes.  The contents of the memory are
     unchanged up to the lesser of the new and old sizes.  If the new size is larger, the contents of the newly allocated portion of the memory
     are undefined.  Upon success, the memory referenced by ptr is freed and a pointer to the newly allocated memory is returned.  Note that
     reallocf() may move the memory allocation, resulting in a different return value than ptr.  If ptr is NULL, the reallocf() function behaves
     identically to malloc() for the specified size.  Upon failure, when the requested memory cannot be allocated, the passed pointer is freed to
     ease the problems with traditional coding styles for reallocf() causing memory leaks in libraries.

RETURN VALUES

     The reallocf() function returns a pointer, possibly identical to ptr, to the allocated memory if successful; otherwise a NULL pointer is
     returned, and errno is set to ENOMEM if the error was the result of an allocation failure.  The buffer is deallocated in this case.

SEE ALSO

     brk(2), mmap(2), alloca(3), calloc(3), free(3), malloc(3), posix_memalign(3), realloc(3),

HISTORY

     The reallocf() function first appeared in FreeBSD 3.0.

BSD
								September 26, 2009							       BSD