blob: 7745d677a0d5afea8b4e843acf60fa5afa8c1a7f [file] [log] [blame]
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "libString.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;
}