xref: /netbsd/bin/ksh/expand.h (revision 6550d01e)
1 /*	$NetBSD: expand.h,v 1.4 2001/07/26 15:05:07 wiz Exp $	*/
2 
3 /*
4  * Expanding strings
5  */
6 /* $Id: expand.h,v 1.4 2001/07/26 15:05:07 wiz Exp $ */
7 
8 #define X_EXTRA		8	/* this many extra bytes in X string */
9 
10 #if 0				/* Usage */
11 	XString xs;
12 	char *xp;
13 
14 	Xinit(xs, xp, 128, ATEMP); /* allocate initial string */
15 	while ((c = generate()) {
16 		Xcheck(xs, xp);	/* expand string if necessary */
17 		Xput(xs, xp, c); /* add character */
18 	}
19 	return Xclose(xs, xp);	/* resize string */
20 /*
21  * NOTE:
22  *     The Xcheck and Xinit macros have a magic + X_EXTRA in the lengths.
23  *     This is so that you can put up to X_EXTRA characters in a XString
24  *     before calling Xcheck. (See yylex in lex.c)
25  */
26 #endif /* 0 */
27 
28 typedef struct XString {
29 	char   *end, *beg;	/* end, begin of string */
30 	size_t	len;		/* length */
31 	Area	*areap;		/* area to allocate/free from */
32 } XString;
33 
34 typedef char * XStringP;
35 
36 /* initialize expandable string */
37 #define	Xinit(xs, xp, length, area) do { \
38 			(xs).len = length; \
39 			(xs).areap = (area); \
40 			(xs).beg = alloc((xs).len + X_EXTRA, (xs).areap); \
41 			(xs).end = (xs).beg + (xs).len; \
42 			xp = (xs).beg; \
43 		} while (0)
44 
45 /* stuff char into string */
46 #define	Xput(xs, xp, c)	(*xp++ = (c))
47 
48 /* check if there are at least n bytes left */
49 #define	XcheckN(xs, xp, n) do { \
50 		    int more = ((xp) + (n)) - (xs).end; \
51 		    if (more > 0) \
52 			xp = Xcheck_grow_(&xs, xp, more); \
53 		} while (0)
54 
55 /* check for overflow, expand string */
56 #define Xcheck(xs, xp)	XcheckN(xs, xp, 1)
57 
58 /* free string */
59 #define	Xfree(xs, xp)	afree((void*) (xs).beg, (xs).areap)
60 
61 /* close, return string */
62 #define	Xclose(xs, xp)	(char*) aresize((void*)(xs).beg, \
63 					(size_t)((xp) - (xs).beg), (xs).areap)
64 /* begin of string */
65 #define	Xstring(xs, xp)	((xs).beg)
66 
67 #define Xnleft(xs, xp) ((xs).end - (xp))	/* may be less than 0 */
68 #define	Xlength(xs, xp) ((xp) - (xs).beg)
69 #define Xsize(xs, xp) ((xs).end - (xs).beg)
70 #define	Xsavepos(xs, xp) ((xp) - (xs).beg)
71 #define	Xrestpos(xs, xp, n) ((xs).beg + (n))
72 
73 char *	Xcheck_grow_	ARGS((XString *xsp, char *xp, int more));
74 
75 /*
76  * expandable vector of generic pointers
77  */
78 
79 typedef struct XPtrV {
80 	void  **cur;		/* next avail pointer */
81 	void  **beg, **end;	/* begin, end of vector */
82 } XPtrV;
83 
84 #define	XPinit(x, n) do { \
85 			register void **vp__; \
86 			vp__ = (void**) alloc(sizeofN(void*, n), ATEMP); \
87 			(x).cur = (x).beg = vp__; \
88 			(x).end = vp__ + n; \
89 		    } while (0)
90 
91 #define	XPput(x, p) do { \
92 			if ((x).cur >= (x).end) { \
93 				int n = XPsize(x); \
94 				(x).beg = (void**) aresize((void*) (x).beg, \
95 						   sizeofN(void*, n*2), ATEMP); \
96 				(x).cur = (x).beg + n; \
97 				(x).end = (x).cur + n; \
98 			} \
99 			*(x).cur++ = (p); \
100 		} while (0)
101 
102 #define	XPptrv(x)	((x).beg)
103 #define	XPsize(x)	((x).cur - (x).beg)
104 
105 #define	XPclose(x)	(void**) aresize((void*)(x).beg, \
106 					 sizeofN(void*, XPsize(x)), ATEMP)
107 
108 #define	XPfree(x)	afree((void*) (x).beg, ATEMP)
109