1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include "libString.h"
5 
6 /* Append an input line to a String.
7  *
8  * Returns a pointer to the character string (or 0).
9  * Trailing newline is left on.
10  */
11 extern char *
12 s_read_line(Biobuf *fp, String *to)
13 {
14 	char *cp;
15 	int llen;
16 
17 	if(to->ref > 1)
18 		sysfatal("can't s_read_line a shared string");
19 	s_terminate(to);
20 	cp = Brdline(fp, '\n');
21 	if(cp == 0)
22 		return 0;
23 	llen = Blinelen(fp);
24 	if(to->end - to->ptr < llen)
25 		s_grow(to, llen);
26 	memmove(to->ptr, cp, llen);
27 	cp = to->ptr;
28 	to->ptr += llen;
29 	s_terminate(to);
30 	return cp;
31 }