/* extensible Strings */
typedef struct String {
	char *base;	/* base of String */
	char *end;	/* end of allocated space+1 */
	char *ptr;	/* ptr into String */
} String;

#define s_putc(s,c)\
	if (s->ptr<s->end) *(s->ptr)++ = c; else s_grow(s,c)
#define s_terminate(s)\
	if (s->ptr<s->end) *s->ptr = 0; else{ s_grow(s,0); s->ptr--; }
#define s_restart(s) (s->ptr = s->base , s)
#define s_reset(s) (s ? (*(s->ptr = s->base) = '\0' , s) : s_new())
#define s_clone(s) s_copy(s->ptr)
#define s_to_c(s) s->base

extern String	*s_alloc(void);
extern void	s_simplegrow(String*, int);
extern int	s_grow(String*, int);
extern String	*s_new(void);
extern void	s_free(String*);
extern String	*s_append(String*, char*);
extern String	*s_nappend(String*, char*, int);
extern String	*s_array(char*, int);
extern String	*s_copy(char*);
extern String	*s_parse(String*, String*);
extern void	s_tolower(String*);

#ifdef BGETC
extern int	s_read(Biobuf*, String*, int);
extern char	*s_read_line(Biobuf*, String*);
extern char	*s_getline(Biobuf*, String*);
#endif BGETC