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1.1 root 1: /* Copyright (c) 1979 Regents of the University of California */
2: #define CTRL(c) ('c' & 037)
3:
4: char *UP;
5: char *BC;
6:
7: /*
8: * Routine to perform cursor addressing.
9: * CM is a string containing printf type escapes to allow
10: * cursor addressing. We start out ready to print the destination
11: * line, and switch each time we print row or column.
12: * The following escapes are defined for substituting row/column:
13: *
14: * %d as in printf
15: * %2 like %2d
16: * %3 like %3d
17: * %. gives %c hacking special case characters
18: * %+x like %c but adding x first
19: * %<xy if value < x add y, else just use valueindexing)
20: * %r reverses row/column
21: * %i increments row/column (for one origin indexing)
22: * %% gives %
23: *
24: * all other characters are ``self-inserting''.
25: */
26: char *
27: tgoto(CM, destcol, destline)
28: char *CM;
29: int destcol, destline;
30: {
31: static char result[16];
32: static char added[10];
33: char *cp = CM;
34: register char *dp = result;
35: register int c;
36: int oncol = 0;
37: register int which;
38:
39: if (cp == 0) {
40: toohard:
41: /*
42: * ``We don't do that under BOZO's big top''
43: */
44: strcpy(result, "OOPS");
45: return (result);
46: }
47: added[0] = 0;
48: while (c = *cp++) {
49: if (c != '%') {
50: *dp++ = c;
51: continue;
52: }
53: which = oncol ? destcol : destline;
54: switch (c = *cp++) {
55:
56: case 'n':
57: destcol ^= 0140;
58: destline ^= 0140;
59: continue;
60:
61: case 'd':
62: if (which < 10)
63: goto one;
64: if (which < 100)
65: goto two;
66: /* fall into... */
67:
68: case '3':
69: *dp++ = (which / 100) | '0';
70: which %= 100;
71: /* fall into... */
72:
73: case '2':
74: two:
75: *dp++ = which / 10 | '0';
76: one:
77: *dp++ = which % 10 | '0';
78: oncol = 1 - oncol;
79: continue;
80:
81: case '<':
82: if (which < *dp++)
83: which += *dp++;
84: else
85: dp++;
86: goto casedot;
87:
88: case '+':
89: which += *cp++;
90: /* fall into... */
91:
92: case '.':
93: casedot:
94: if (!UP)
95: goto toohard;
96: if (which == 0 || which == CTRL(d) || which == '\t' || which == '\n') {
97: do {
98: strcat(added, oncol ? (BC ? BC : "\b") : UP);
99: which++;
100: } while (which == '\n');
101: }
102: *dp++ = which;
103: /* fall into... */
104:
105: case 'r':
106: oncol = 1 - oncol;
107: continue;
108:
109: case 'i':
110: destcol++;
111: destline++;
112: continue;
113:
114: case '%':
115: *dp++ = c;
116: continue;
117:
118: default:
119: goto toohard;
120: }
121: }
122: strcpy(dp, added);
123: return (result);
124: }
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