108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/* $NetBSD: expand.h,v 1.4 2001/07/26 15:05:07 wiz Exp $ */
|
|
|
|
/*
|
|
* Expanding strings
|
|
*/
|
|
/* $Id: expand.h,v 1.4 2001/07/26 15:05:07 wiz Exp $ */
|
|
|
|
#define X_EXTRA 8 /* this many extra bytes in X string */
|
|
|
|
#if 0 /* Usage */
|
|
XString xs;
|
|
char *xp;
|
|
|
|
Xinit(xs, xp, 128, ATEMP); /* allocate initial string */
|
|
while ((c = generate()) {
|
|
Xcheck(xs, xp); /* expand string if necessary */
|
|
Xput(xs, xp, c); /* add character */
|
|
}
|
|
return Xclose(xs, xp); /* resize string */
|
|
/*
|
|
* NOTE:
|
|
* The Xcheck and Xinit macros have a magic + X_EXTRA in the lengths.
|
|
* This is so that you can put up to X_EXTRA characters in a XString
|
|
* before calling Xcheck. (See yylex in lex.c)
|
|
*/
|
|
#endif /* 0 */
|
|
|
|
typedef struct XString {
|
|
char *end, *beg; /* end, begin of string */
|
|
size_t len; /* length */
|
|
Area *areap; /* area to allocate/free from */
|
|
} XString;
|
|
|
|
typedef char * XStringP;
|
|
|
|
/* initialize expandable string */
|
|
#define Xinit(xs, xp, length, area) do { \
|
|
(xs).len = length; \
|
|
(xs).areap = (area); \
|
|
(xs).beg = alloc((xs).len + X_EXTRA, (xs).areap); \
|
|
(xs).end = (xs).beg + (xs).len; \
|
|
xp = (xs).beg; \
|
|
} while (0)
|
|
|
|
/* stuff char into string */
|
|
#define Xput(xs, xp, c) (*xp++ = (c))
|
|
|
|
/* check if there are at least n bytes left */
|
|
#define XcheckN(xs, xp, n) do { \
|
|
int more = ((xp) + (n)) - (xs).end; \
|
|
if (more > 0) \
|
|
xp = Xcheck_grow_(&xs, xp, more); \
|
|
} while (0)
|
|
|
|
/* check for overflow, expand string */
|
|
#define Xcheck(xs, xp) XcheckN(xs, xp, 1)
|
|
|
|
/* free string */
|
|
#define Xfree(xs, xp) afree((void*) (xs).beg, (xs).areap)
|
|
|
|
/* close, return string */
|
|
#define Xclose(xs, xp) (char*) aresize((void*)(xs).beg, \
|
|
(size_t)((xp) - (xs).beg), (xs).areap)
|
|
/* begin of string */
|
|
#define Xstring(xs, xp) ((xs).beg)
|
|
|
|
#define Xnleft(xs, xp) ((xs).end - (xp)) /* may be less than 0 */
|
|
#define Xlength(xs, xp) ((xp) - (xs).beg)
|
|
#define Xsize(xs, xp) ((xs).end - (xs).beg)
|
|
#define Xsavepos(xs, xp) ((xp) - (xs).beg)
|
|
#define Xrestpos(xs, xp, n) ((xs).beg + (n))
|
|
|
|
char * Xcheck_grow_ ARGS((XString *xsp, char *xp, int more));
|
|
|
|
/*
|
|
* expandable vector of generic pointers
|
|
*/
|
|
|
|
typedef struct XPtrV {
|
|
void **cur; /* next avail pointer */
|
|
void **beg, **end; /* begin, end of vector */
|
|
} XPtrV;
|
|
|
|
#define XPinit(x, n) do { \
|
|
register void **vp__; \
|
|
vp__ = (void**) alloc(sizeofN(void*, n), ATEMP); \
|
|
(x).cur = (x).beg = vp__; \
|
|
(x).end = vp__ + n; \
|
|
} while (0)
|
|
|
|
#define XPput(x, p) do { \
|
|
if ((x).cur >= (x).end) { \
|
|
int n = XPsize(x); \
|
|
(x).beg = (void**) aresize((void*) (x).beg, \
|
|
sizeofN(void*, n*2), ATEMP); \
|
|
(x).cur = (x).beg + n; \
|
|
(x).end = (x).cur + n; \
|
|
} \
|
|
*(x).cur++ = (p); \
|
|
} while (0)
|
|
|
|
#define XPptrv(x) ((x).beg)
|
|
#define XPsize(x) ((x).cur - (x).beg)
|
|
|
|
#define XPclose(x) (void**) aresize((void*)(x).beg, \
|
|
sizeofN(void*, XPsize(x)), ATEMP)
|
|
|
|
#define XPfree(x) afree((void*) (x).beg, ATEMP)
|