1 5cedca1b 2004-05-15 devnull /* te.c: error message control, input line count */
 2 5cedca1b 2004-05-15 devnull # include "t.h"
 3 5cedca1b 2004-05-15 devnull 
 4 5cedca1b 2004-05-15 devnull void
 5 5cedca1b 2004-05-15 devnull error(char *s)
 6 5cedca1b 2004-05-15 devnull {
 7 8a3cbc15 2004-05-17 devnull 	fprint(2, "\n%s:%d: %s\n", ifile, iline, s);
 8 8a3cbc15 2004-05-17 devnull 	fprint(2, "tbl quits\n");
 9 8a3cbc15 2004-05-17 devnull 	exits(s);
10 5cedca1b 2004-05-15 devnull }
11 5cedca1b 2004-05-15 devnull 
12 5cedca1b 2004-05-15 devnull 
13 5cedca1b 2004-05-15 devnull char	*
14 5cedca1b 2004-05-15 devnull gets1(char *s, int size)
15 5cedca1b 2004-05-15 devnull {
16 5cedca1b 2004-05-15 devnull 	char	*p, *ns;
17 5cedca1b 2004-05-15 devnull 	int	nbl;
18 5cedca1b 2004-05-15 devnull 
19 5cedca1b 2004-05-15 devnull 	iline++;
20 5cedca1b 2004-05-15 devnull 	ns = s;
21 8a3cbc15 2004-05-17 devnull 	p = Brdline(tabin, '\n');
22 5cedca1b 2004-05-15 devnull 	while (p == 0) {
23 5cedca1b 2004-05-15 devnull 		if (swapin() == 0)
24 5cedca1b 2004-05-15 devnull 			return(0);
25 8a3cbc15 2004-05-17 devnull 		p = Brdline(tabin, '\n');
26 5cedca1b 2004-05-15 devnull 	}
27 8a3cbc15 2004-05-17 devnull 	nbl = Blinelen(tabin)-1;
28 5cedca1b 2004-05-15 devnull 	if(nbl >= size)
29 5cedca1b 2004-05-15 devnull 		error("input buffer too small");
30 5cedca1b 2004-05-15 devnull 	p[nbl] = 0;
31 5cedca1b 2004-05-15 devnull 	strcpy(s, p);
32 5cedca1b 2004-05-15 devnull 	s += nbl;
33 5cedca1b 2004-05-15 devnull 	for (nbl = 0; *s == '\\' && s > ns; s--)
34 5cedca1b 2004-05-15 devnull 		nbl++;
35 5cedca1b 2004-05-15 devnull 	if (linstart && nbl % 2) /* fold escaped nl if in table */
36 5cedca1b 2004-05-15 devnull 		gets1(s + 1, size - (s-ns));
37 5cedca1b 2004-05-15 devnull 
38 5cedca1b 2004-05-15 devnull 	return(p);
39 5cedca1b 2004-05-15 devnull }
40 5cedca1b 2004-05-15 devnull 
41 5cedca1b 2004-05-15 devnull 
42 5cedca1b 2004-05-15 devnull # define BACKMAX 500
43 5cedca1b 2004-05-15 devnull char	backup[BACKMAX];
44 5cedca1b 2004-05-15 devnull char	*backp = backup;
45 5cedca1b 2004-05-15 devnull 
46 5cedca1b 2004-05-15 devnull void
47 5cedca1b 2004-05-15 devnull un1getc(int c)
48 5cedca1b 2004-05-15 devnull {
49 5cedca1b 2004-05-15 devnull 	if (c == '\n')
50 5cedca1b 2004-05-15 devnull 		iline--;
51 5cedca1b 2004-05-15 devnull 	*backp++ = c;
52 5cedca1b 2004-05-15 devnull 	if (backp >= backup + BACKMAX)
53 5cedca1b 2004-05-15 devnull 		error("too much backup");
54 5cedca1b 2004-05-15 devnull }
55 5cedca1b 2004-05-15 devnull 
56 5cedca1b 2004-05-15 devnull 
57 5cedca1b 2004-05-15 devnull int
58 5cedca1b 2004-05-15 devnull get1char(void)
59 5cedca1b 2004-05-15 devnull {
60 5cedca1b 2004-05-15 devnull 	int	c;
61 5cedca1b 2004-05-15 devnull 	if (backp > backup)
62 5cedca1b 2004-05-15 devnull 		c = *--backp;
63 5cedca1b 2004-05-15 devnull 	else
64 8a3cbc15 2004-05-17 devnull 		c = Bgetc(tabin);
65 5cedca1b 2004-05-15 devnull 	if (c == 0) /* EOF */ {
66 5cedca1b 2004-05-15 devnull 		if (swapin() == 0)
67 5cedca1b 2004-05-15 devnull 			error("unexpected EOF");
68 8a3cbc15 2004-05-17 devnull 		c = Bgetc(tabin);
69 5cedca1b 2004-05-15 devnull 	}
70 5cedca1b 2004-05-15 devnull 	if (c == '\n')
71 5cedca1b 2004-05-15 devnull 		iline++;
72 5cedca1b 2004-05-15 devnull 	return(c);
73 5cedca1b 2004-05-15 devnull }