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Annotation of 43BSDReno/usr.bin/vis/foldit.c, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1990 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[] = "@(#)foldit.c   1.1 (Berkeley) 5/23/90";
                     22: #endif /* not lint */
                     23: 
                     24: foldit(chunk, col, max)
                     25:        char *chunk;
                     26: {
                     27:        register char *cp;
                     28: 
                     29:        /*
                     30:         * Keep track of column position. Insert hidden newline
                     31:         * if this chunk puts us over the limit.
                     32:         */
                     33: again:
                     34:        cp = chunk;
                     35:        while (*cp) {
                     36:                switch(*cp) {
                     37:                case '\n':
                     38:                case '\r':
                     39:                        col = 0;
                     40:                        break;
                     41:                case '\t':
                     42:                        col = col + 8 &~ 07;
                     43:                        break;
                     44:                case '\b':
                     45:                        col = col ? col - 1 : 0;
                     46:                        break;
                     47:                default:
                     48:                        col++;
                     49:                }
                     50:                if (col > (max - 2)) {
                     51:                        printf("\\\n");
                     52:                        col = 0;
                     53:                        goto again;
                     54:                } 
                     55:                cp++;
                     56:        }
                     57:        return (col);
                     58: }

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