#include <u.h>#include <libc.h>#include "String.h" /* grow a String's allocation by at least `incr' bytes */extern String*s_grow(String *s, int incr)	{	char *cp;	int size; 	if(s->fixed)		sysfatal("s_grow of constant string");	s = s_unique(s); 	/*	 *  take a larger increment to avoid mallocing too often	 */	size = s->end-s->base;	if(size/2 < incr)		size += incr;	else		size += size/2; 	cp = realloc(s->base, size);	if (cp == 0)		sysfatal("s_grow: %r");	s->ptr = (s->ptr - s->base) + cp;	s->end = cp + size;	s->base = cp; 	return s;}