#define BLOCK (1 << 14)

char *text;
int i, nelem;
FILE *file;

/* qua apro file */

text = (char *)malloc(BLOCK * sizeof(char));
i = 0;
while((nelem = fread(text + i * BLOCK, BLOCK, sizeof(char), &file)) == BLOCK)
    malloc(text, ++i * BLOCK * text);
text[i * BLOCK + nelem] = '\0';