/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* tc.c: find character not in table to delimit fields */# include "t.h" # define COMMON "\002\003\005\006\007!%&#/?,:;<=>@`^~_{}+-*" \	"ABCDEFGHIJKMNOPQRSTUVWXZabcdefgjkoqrstwxyz" voidchoochar(void){				/* choose funny characters to delimit fields */	int	had[128], ilin, icol, k;	char	*s; 	for (icol = 0; icol < 128; icol++)		had[icol] = 0;	F1 = F2 = 0;	for (ilin = 0; ilin < nlin; ilin++) {		if (instead[ilin] || fullbot[ilin])			continue;		for (icol = 0; icol < ncol; icol++) {			k = ctype(ilin, icol);			if (k == 0 || k == '-' || k == '=')				continue;			s = table[ilin][icol].col;			if (point(s))				for (; *s; s++)					if((unsigned char)*s < 128)						had[(unsigned char)*s] = 1;			s = table[ilin][icol].rcol;			if (point(s))				for (; *s; s++)					if((unsigned char)*s < 128)						had[(unsigned char)*s] = 1;		}	}				/* choose first funny character */	for (s = COMMON "Y"; *s; s++) {		if (had[*s] == 0) {			F1 = *s;			had[F1] = 1;			break;		}	}				/* choose second funny character */	for (s = COMMON "u"; *s; s++) {		if (had[*s] == 0) {			F2 = *s;			break;		}	}	if (F1 == 0 || F2 == 0)		error("couldn't find characters to use for delimiters");} intpoint(char *ss){	vlong s = (uintptr)ss; 	return(s >= 128 || s < 0);}