Here's something I've found a useful upgrade to asprintf, as it frees the passed-in buffer after expanding the format string. You can just pass the same char **

Here's something I've found a useful upgrade to asprintf, as it frees the passed-in buffer after expanding the format string. You can just pass the same char ** repeatedly (and also pass it as one of the string arguments corresponding to a %s!) and it'll update the pointer appropriately each time. Makes many kinds of string manipulation very simple. int xasprintf(char**p,const char *fmt,..) { int n=0; char *p2=nullptr; if(fmt) { va_list v; va_start(v); n=asprintf(&p2,fmt,v); va_end(v); } if(n>=0) { free(*p); *p=p2; } return n; } If you thought asprintf was inefficient, this is worse. But it's very convenient!