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/* tb.c: check which entries exist, also storage allocation */
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# include "t.h"
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void
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checkuse(void)
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{
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	int	i, c, k;
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	for (c = 0; c < ncol; c++) {
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		used[c] = lused[c] = rused[c] = 0;
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		for (i = 0; i < nlin; i++) {
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			if (instead[i] || fullbot[i])
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				continue;
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			k = ctype(i, c);
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			if (k == '-' || k == '=')
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				continue;
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			if ((k == 'n' || k == 'a')) {
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				rused[c] |= real(table[i][c].rcol);
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				if ( !real(table[i][c].rcol))
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					used[c] |= real(table[i][c].col);
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				if (table[i][c].rcol)
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					lused[c] |= real(table[i][c].col);
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			} else
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				used[c] |= real(table[i][c].col);
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		}
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	}
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}
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int
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real(char *s)
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{
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	if (s == 0)
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		return(0);
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	if (!point(s))
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		return(1);
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	if (*s == 0)
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		return(0);
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	return(1);
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}
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int	spcount = 0;
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# define MAXVEC 20
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char	*spvecs[MAXVEC];
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char	*
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chspace(void)
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{
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	char	*pp;
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	if (spvecs[spcount])
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		return(spvecs[spcount++]);
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	if (spcount >= MAXVEC)
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		error("Too many characters in table");
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	spvecs[spcount++] = pp = calloc(MAXCHS + MAXLINLEN, 1);
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	if (pp == (char *) - 1 || pp == (char *)0)
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		error("no space for characters");
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	return(pp);
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}
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# define MAXPC 50
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char	*thisvec;
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int	tpcount = -1;
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char	*tpvecs[MAXPC];
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int	*
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alocv(int n)
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{
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	int	*tp, *q;
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	if (tpcount < 0 || thisvec + n > tpvecs[tpcount] + MAXCHS) {
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		tpcount++;
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		if (tpvecs[tpcount] == 0) {
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			tpvecs[tpcount] = calloc(MAXCHS, 1);
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		}
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		thisvec = tpvecs[tpcount];
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		if (thisvec == (char *)0)
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			error("no space for vectors");
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	}
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	tp = (int *)thisvec;
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	thisvec += n;
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	for (q = tp; q < (int *)thisvec; q++)
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		*q = 0;
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	return(tp);
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}
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void
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release(void)
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{
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			/* give back unwanted space in some vectors */
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			/* this should call free; it does not because
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				alloc() is so buggy */
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	spcount = 0;
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	tpcount = -1;
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	exstore = 0;
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}
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