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 "libString.h"
 4 7f11104a 2003-12-11 devnull 
 5 7f11104a 2003-12-11 devnull /* grow a String's allocation by at least `incr' bytes */
 6 7f11104a 2003-12-11 devnull extern String*
 7 fa325e9b 2020-01-10 cross s_grow(String *s, int incr)
 8 7f11104a 2003-12-11 devnull {
 9 7f11104a 2003-12-11 devnull 	char *cp;
10 7f11104a 2003-12-11 devnull 	int size;
11 7f11104a 2003-12-11 devnull 
12 7f11104a 2003-12-11 devnull 	if(s->fixed)
13 7f11104a 2003-12-11 devnull 		sysfatal("s_grow of constant string");
14 7f11104a 2003-12-11 devnull 	s = s_unique(s);
15 7f11104a 2003-12-11 devnull 
16 7f11104a 2003-12-11 devnull 	/*
17 7f11104a 2003-12-11 devnull 	 *  take a larger increment to avoid mallocing too often
18 7f11104a 2003-12-11 devnull 	 */
19 7f11104a 2003-12-11 devnull 	size = s->end-s->base;
20 7f11104a 2003-12-11 devnull 	if(size/2 < incr)
21 7f11104a 2003-12-11 devnull 		size += incr;
22 7f11104a 2003-12-11 devnull 	else
23 7f11104a 2003-12-11 devnull 		size += size/2;
24 7f11104a 2003-12-11 devnull 
25 7f11104a 2003-12-11 devnull 	cp = realloc(s->base, size);
26 7f11104a 2003-12-11 devnull 	if (cp == 0)
27 7f11104a 2003-12-11 devnull 		sysfatal("s_grow: %r");
28 7f11104a 2003-12-11 devnull 	s->ptr = (s->ptr - s->base) + cp;
29 7f11104a 2003-12-11 devnull 	s->end = cp + size;
30 7f11104a 2003-12-11 devnull 	s->base = cp;
31 7f11104a 2003-12-11 devnull 
32 7f11104a 2003-12-11 devnull 	return s;
33 7f11104a 2003-12-11 devnull }