arrays - C how to modify memory of structs that are inside other structs -

if have 2 structs:

typedef struct{     unsigned int time;     double rate;  }quote;  typedef struct{      unsigned int freeslots;     unsigned int end;     unsigned int start;     unsigned int currsize;     unsigned int maxsize;     unsigned int startat;     //unsigned int currindex;     quote quotebuffer[1];  }cbuf; 

and wanted make function modify size of quotebuffer array inside cbuf, how go doing that? have tried few approaches none have worked far. keep returning same format of:

quote *newquotebuffer = malloc(sizeof(quote) * newsize); 

and if have existing cbuf somewhere (for example, call "a" pointer cbuf):

a->quotebuffer = newquotebuffer; 

but doesn't work. hints?

this:

quote quotebuffer[1]; 

should be:

quote *quotebuffer; 

then assignment work.

dereferencing quote looks this:

a->quotebuffer->time; 

if later have multiple elements of quote allocated malloc() can access them this:

a->quotebuffer[i].time;