ref: 5d202d345616907d511b46e395226958fe66a2c3
dir: /sys/src/cmd/tbl/tc.c/
/* tc.c: find character not in table to delimit fields */ # include "t.h" # define COMMON "\002\003\005\006\007!%&#/?,:;<=>@`^~_{}+-*" \ "ABCDEFGHIJKMNOPQRSTUVWXZabcdefgjkoqrstwxyz" void choochar(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"); } int point(char *ss) { vlong s = (uintptr)ss; return(s >= 128 || s < 0); }