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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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