File: xreadlink.c

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#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

int xreadlink(char *from, char **to, size_t size) { 

  int retchars;

  if ( !to || !from ) {
    errno = EINVAL;
    return -1;
  }

  if ( !size || !*to ) {
    size = 256;
    *to = (char*)malloc(size);
    if ( !*to ) 
      return -1;

    retchars = readlink(from,*to,size);

    while ( retchars >= size ) { 
      size *= 2;
      free(*to);
      *to = (char*)malloc(size);
      if ( !*to ) { 
	return -1;
      }
      retchars = readlink(from,*to,size);
    }

    return size;
  } else {
    retchars = readlink(from,*to,size);
    (*to)[retchars] = '\0';
    return retchars;
  }
}