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Annotation of 43BSDReno/lib/libterm/tgoto.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)tgoto.c    5.4 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #define        CTRL(c) ((c) & 037)
        !            25: 
        !            26: #define MAXRETURNSIZE 64
        !            27: 
        !            28: char   *UP;
        !            29: char   *BC;
        !            30: 
        !            31: /*
        !            32:  * Routine to perform cursor addressing.
        !            33:  * CM is a string containing printf type escapes to allow
        !            34:  * cursor addressing.  We start out ready to print the destination
        !            35:  * line, and switch each time we print row or column.
        !            36:  * The following escapes are defined for substituting row/column:
        !            37:  *
        !            38:  *     %d      as in printf
        !            39:  *     %2      like %2d
        !            40:  *     %3      like %3d
        !            41:  *     %.      gives %c hacking special case characters
        !            42:  *     %+x     like %c but adding x first
        !            43:  *
        !            44:  *     The codes below affect the state but don't use up a value.
        !            45:  *
        !            46:  *     %>xy    if value > x add y
        !            47:  *     %r      reverses row/column
        !            48:  *     %i      increments row/column (for one origin indexing)
        !            49:  *     %%      gives %
        !            50:  *     %B      BCD (2 decimal digits encoded in one byte)
        !            51:  *     %D      Delta Data (backwards bcd)
        !            52:  *
        !            53:  * all other characters are ``self-inserting''.
        !            54:  */
        !            55: char *
        !            56: tgoto(CM, destcol, destline)
        !            57:        char *CM;
        !            58:        int destcol, destline;
        !            59: {
        !            60:        static char result[MAXRETURNSIZE];
        !            61:        static char added[10];
        !            62:        char *cp = CM;
        !            63:        register char *dp = result;
        !            64:        register int c;
        !            65:        int oncol = 0;
        !            66:        register int which = destline;
        !            67: 
        !            68:        if (cp == 0) {
        !            69: toohard:
        !            70:                /*
        !            71:                 * ``We don't do that under BOZO's big top''
        !            72:                 */
        !            73:                return ("OOPS");
        !            74:        }
        !            75:        added[0] = 0;
        !            76:        while (c = *cp++) {
        !            77:                if (c != '%') {
        !            78:                        *dp++ = c;
        !            79:                        continue;
        !            80:                }
        !            81:                switch (c = *cp++) {
        !            82: 
        !            83: #ifdef CM_N
        !            84:                case 'n':
        !            85:                        destcol ^= 0140;
        !            86:                        destline ^= 0140;
        !            87:                        goto setwhich;
        !            88: #endif
        !            89: 
        !            90:                case 'd':
        !            91:                        if (which < 10)
        !            92:                                goto one;
        !            93:                        if (which < 100)
        !            94:                                goto two;
        !            95:                        /* fall into... */
        !            96: 
        !            97:                case '3':
        !            98:                        *dp++ = (which / 100) | '0';
        !            99:                        which %= 100;
        !           100:                        /* fall into... */
        !           101: 
        !           102:                case '2':
        !           103: two:   
        !           104:                        *dp++ = which / 10 | '0';
        !           105: one:
        !           106:                        *dp++ = which % 10 | '0';
        !           107: swap:
        !           108:                        oncol = 1 - oncol;
        !           109: setwhich:
        !           110:                        which = oncol ? destcol : destline;
        !           111:                        continue;
        !           112: 
        !           113: #ifdef CM_GT
        !           114:                case '>':
        !           115:                        if (which > *cp++)
        !           116:                                which += *cp++;
        !           117:                        else
        !           118:                                cp++;
        !           119:                        continue;
        !           120: #endif
        !           121: 
        !           122:                case '+':
        !           123:                        which += *cp++;
        !           124:                        /* fall into... */
        !           125: 
        !           126:                case '.':
        !           127: casedot:
        !           128:                        /*
        !           129:                         * This code is worth scratching your head at for a
        !           130:                         * while.  The idea is that various weird things can
        !           131:                         * happen to nulls, EOT's, tabs, and newlines by the
        !           132:                         * tty driver, arpanet, and so on, so we don't send
        !           133:                         * them if we can help it.
        !           134:                         *
        !           135:                         * Tab is taken out to get Ann Arbors to work, otherwise
        !           136:                         * when they go to column 9 we increment which is wrong
        !           137:                         * because bcd isn't continuous.  We should take out
        !           138:                         * the rest too, or run the thing through more than
        !           139:                         * once until it doesn't make any of these, but that
        !           140:                         * would make termlib (and hence pdp-11 ex) bigger,
        !           141:                         * and also somewhat slower.  This requires all
        !           142:                         * programs which use termlib to stty tabs so they
        !           143:                         * don't get expanded.  They should do this anyway
        !           144:                         * because some terminals use ^I for other things,
        !           145:                         * like nondestructive space.
        !           146:                         */
        !           147:                        if (which == 0 || which == CTRL('d') || /* which == '\t' || */ which == '\n') {
        !           148:                                if (oncol || UP) /* Assumption: backspace works */
        !           149:                                        /*
        !           150:                                         * Loop needed because newline happens
        !           151:                                         * to be the successor of tab.
        !           152:                                         */
        !           153:                                        do {
        !           154:                                                strcat(added, oncol ? (BC ? BC : "\b") : UP);
        !           155:                                                which++;
        !           156:                                        } while (which == '\n');
        !           157:                        }
        !           158:                        *dp++ = which;
        !           159:                        goto swap;
        !           160: 
        !           161:                case 'r':
        !           162:                        oncol = 1;
        !           163:                        goto setwhich;
        !           164: 
        !           165:                case 'i':
        !           166:                        destcol++;
        !           167:                        destline++;
        !           168:                        which++;
        !           169:                        continue;
        !           170: 
        !           171:                case '%':
        !           172:                        *dp++ = c;
        !           173:                        continue;
        !           174: 
        !           175: #ifdef CM_B
        !           176:                case 'B':
        !           177:                        which = (which/10 << 4) + which%10;
        !           178:                        continue;
        !           179: #endif
        !           180: 
        !           181: #ifdef CM_D
        !           182:                case 'D':
        !           183:                        which = which - 2 * (which%16);
        !           184:                        continue;
        !           185: #endif
        !           186: 
        !           187:                default:
        !           188:                        goto toohard;
        !           189:                }
        !           190:        }
        !           191:        strcpy(dp, added);
        !           192:        return (result);
        !           193: }

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