1 7f11104a 2003-12-11 devnull #include <u.h>
 2 7f11104a 2003-12-11 devnull #include <libc.h>
 3 7f11104a 2003-12-11 devnull #include <bio.h>
 4 7f11104a 2003-12-11 devnull #include "libString.h"
 5 7f11104a 2003-12-11 devnull 
 6 7f11104a 2003-12-11 devnull enum
 7 7f11104a 2003-12-11 devnull {
 8 cbeb0b26 2006-04-01 devnull 	Minread=	256
 9 7f11104a 2003-12-11 devnull };
10 7f11104a 2003-12-11 devnull 
11 7f11104a 2003-12-11 devnull /* Append up to 'len' input bytes to the string 'to'.
12 7f11104a 2003-12-11 devnull  *
13 7f11104a 2003-12-11 devnull  * Returns the number of characters read.
14 fa325e9b 2020-01-10 cross  */
15 7f11104a 2003-12-11 devnull extern int
16 7f11104a 2003-12-11 devnull s_read(Biobuf *fp, String *to, int len)
17 7f11104a 2003-12-11 devnull {
18 7f11104a 2003-12-11 devnull 	int rv;
19 7f11104a 2003-12-11 devnull 	int n;
20 7f11104a 2003-12-11 devnull 
21 7f11104a 2003-12-11 devnull 	if(to->ref > 1)
22 7f11104a 2003-12-11 devnull 		sysfatal("can't s_read a shared string");
23 7f11104a 2003-12-11 devnull 	for(rv = 0; rv < len; rv += n){
24 7f11104a 2003-12-11 devnull 		n = to->end - to->ptr;
25 7f11104a 2003-12-11 devnull 		if(n < Minread){
26 7f11104a 2003-12-11 devnull 			s_grow(to, Minread);
27 7f11104a 2003-12-11 devnull 			n = to->end - to->ptr;
28 7f11104a 2003-12-11 devnull 		}
29 7f11104a 2003-12-11 devnull 		if(n > len - rv)
30 7f11104a 2003-12-11 devnull 			n = len - rv;
31 7f11104a 2003-12-11 devnull 		n = Bread(fp, to->ptr, n);
32 7f11104a 2003-12-11 devnull 		if(n <= 0)
33 7f11104a 2003-12-11 devnull 			break;
34 7f11104a 2003-12-11 devnull 		to->ptr += n;
35 7f11104a 2003-12-11 devnull 	}
36 7f11104a 2003-12-11 devnull 	s_terminate(to);
37 7f11104a 2003-12-11 devnull 	return rv;
38 7f11104a 2003-12-11 devnull }