Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>
#include "String.h"

enum
{
        Minread=        256,
};

/* Append up to 'len' input bytes to the string 'to'.
 *
 * Returns the number of characters read.
 */ 
extern int
s_read(Biobuf *fp, String *to, int len)
{
        int rv;
        int n;

        if(to->ref > 1)
                sysfatal("can't s_read a shared string");
        for(rv = 0; rv < len; rv += n){
                n = to->end - to->ptr;
                if(n < Minread){
                        s_grow(to, Minread);
                        n = to->end - to->ptr;
                }
                if(n > len - rv)
                        n = len - rv;
                n = Bread(fp, to->ptr, n);
                if(n <= 0)
                        break;
                to->ptr += n;
        }
        s_terminate(to);
        return rv;
}