379 lines
6.8 KiB
C
379 lines
6.8 KiB
C
/* $NetBSD: fpr.c,v 1.9 2011/09/04 20:26:17 joerg Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Robert Corbett.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)fpr.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: fpr.c,v 1.9 2011/09/04 20:26:17 joerg Exp $");
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#endif /* not lint */
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define BLANK ' '
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#define TAB '\t'
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#define NUL '\000'
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#define FF '\f'
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#define BS '\b'
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#define CR '\r'
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#define VTAB '\013'
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#define EOL '\n'
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#define TRUE 1
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#define FALSE 0
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#define MAXCOL 170
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#define TABSIZE 8
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#define INITWIDTH 8
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typedef
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struct column {
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int count;
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int width;
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char *str;
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}
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COLUMN;
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static char cc;
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static char saved;
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static int length;
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static char *text;
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static int highcol;
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static COLUMN *line;
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static int maxpos;
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static int maxcol;
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static void flush(void);
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static void get_text(void);
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static void init(void);
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__dead static void nospace(void);
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static void savech(int);
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int
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main(int argc, char **argv)
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{
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int ch;
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char ateof;
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int i;
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int errorcount;
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init();
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errorcount = 0;
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ateof = FALSE;
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switch (ch = getchar()) {
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case EOF:
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exit(0);
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case EOL:
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cc = NUL;
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ungetc((int) EOL, stdin);
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break;
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case BLANK:
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cc = NUL;
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break;
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case '1':
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cc = FF;
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break;
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case '0':
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cc = EOL;
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break;
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case '+':
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cc = CR;
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break;
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default:
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errorcount = 1;
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cc = NUL;
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ungetc(ch, stdin);
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break;
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}
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while (!ateof) {
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get_text();
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switch (ch = getchar()) {
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case EOF:
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flush();
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ateof = TRUE;
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break;
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case EOL:
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flush();
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cc = NUL;
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ungetc((int) EOL, stdin);
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break;
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case BLANK:
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flush();
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cc = NUL;
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break;
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case '1':
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flush();
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cc = FF;
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break;
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case '0':
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flush();
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cc = EOL;
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break;
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case '+':
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for (i = 0; i < length; i++)
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savech(i);
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break;
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default:
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errorcount++;
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flush();
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cc = NUL;
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ungetc(ch, stdin);
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break;
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}
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}
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if (errorcount)
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fprintf(stderr, "Illegal carriage control - %d line%s.\n",
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errorcount, errorcount == 1 ? "" : "s");
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exit(0);
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}
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static void
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init(void)
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{
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COLUMN *cp;
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COLUMN *cend;
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char *sp;
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length = 0;
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maxpos = MAXCOL;
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sp = malloc((unsigned) maxpos);
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if (sp == NULL)
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nospace();
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text = sp;
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highcol = -1;
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maxcol = MAXCOL;
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line = calloc(maxcol, sizeof(COLUMN));
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if (line == NULL)
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nospace();
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cp = line;
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cend = line + (maxcol - 1);
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while (cp <= cend) {
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cp->width = INITWIDTH;
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sp = calloc(INITWIDTH, sizeof(char));
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if (sp == NULL)
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nospace();
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cp->str = sp;
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cp++;
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}
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}
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static void
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get_text(void)
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{
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int i;
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char ateol;
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int ch;
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int pos;
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char *n;
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i = 0;
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ateol = FALSE;
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while (!ateol) {
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switch (ch = getchar()) {
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case EOL:
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case EOF:
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ateol = TRUE;
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break;
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case TAB:
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pos = (1 + i / TABSIZE) * TABSIZE;
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if (pos > maxpos) {
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n = realloc(text, (unsigned)(pos + 10));
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if (n == NULL)
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nospace();
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text = n;
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maxpos = pos + 10;
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}
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while (i < pos) {
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text[i] = BLANK;
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i++;
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}
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break;
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case BS:
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if (i > 0) {
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i--;
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savech(i);
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}
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break;
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case CR:
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while (i > 0) {
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i--;
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savech(i);
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}
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break;
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case FF:
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case VTAB:
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flush();
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cc = ch;
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i = 0;
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break;
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default:
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if (i >= maxpos) {
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n = realloc(text, (unsigned)(i + 10));
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if (n == NULL)
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nospace();
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maxpos = i + 10;
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}
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text[i] = ch;
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i++;
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break;
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}
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}
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length = i;
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}
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static void
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savech(int col)
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{
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char ch;
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int oldmax;
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COLUMN *cp;
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COLUMN *cend;
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char *sp;
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int newcount;
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COLUMN *newline;
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ch = text[col];
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if (ch == BLANK)
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return;
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saved = TRUE;
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if (col >= highcol)
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highcol = col;
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if (col >= maxcol) {
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newline = realloc(line, (unsigned) (col + 10) * sizeof(COLUMN));
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if (newline == NULL)
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nospace();
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line = newline;
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oldmax = maxcol;
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maxcol = col + 10;
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cp = line + oldmax;
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cend = line + (maxcol - 1);
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while (cp <= cend) {
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cp->width = INITWIDTH;
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cp->count = 0;
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sp = calloc(INITWIDTH, sizeof(char));
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if (sp == NULL)
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nospace();
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cp->str = sp;
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cp++;
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}
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}
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cp = line + col;
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newcount = cp->count + 1;
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if (newcount > cp->width) {
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cp->width = newcount;
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sp = realloc(cp->str, (unsigned) newcount * sizeof(char));
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if (sp == NULL)
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nospace();
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cp->str = sp;
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}
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cp->count = newcount;
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cp->str[newcount - 1] = ch;
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}
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static void
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flush(void)
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{
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int i;
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int anchor;
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int height;
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int j;
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if (cc != NUL)
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putchar(cc);
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if (!saved) {
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i = length;
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while (i > 0 && text[i - 1] == BLANK)
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i--;
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length = i;
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for (i = 0; i < length; i++)
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putchar(text[i]);
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putchar(EOL);
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return;
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}
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for (i = 0; i < length; i++)
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savech(i);
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anchor = 0;
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while (anchor <= highcol) {
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height = line[anchor].count;
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if (height == 0) {
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putchar(BLANK);
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anchor++;
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} else if (height == 1) {
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putchar(*(line[anchor].str));
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line[anchor].count = 0;
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anchor++;
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} else {
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i = anchor;
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while (i < highcol && line[i + 1].count > 1)
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i++;
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for (j = anchor; j <= i; j++) {
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height = line[j].count - 1;
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putchar(line[j].str[height]);
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line[j].count = height;
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}
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for (j = anchor; j <= i; j++)
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putchar(BS);
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}
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}
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putchar(EOL);
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highcol = -1;
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}
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static void
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nospace(void)
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{
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errx(1, "Storage limit exceeded.");
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}
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