95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
/*
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* $Source$
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* $Revision$
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* $Date$
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*
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* Copyright (C) 1996,97 by CyberSolutions GmbH.
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* All rights reserved.
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*/
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#include <ctype.h>
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#include "text.h"
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/* Wrap a text buffer at a certain column.
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This routine wraps all lines in a text buffer that are longer than
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the specified limit. Paragraphs will remain untouched. Paragraphs
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are separated by an empty line -- a line containing only a line
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feed (\\n) that is.
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AUTHOR: Peter Simons <simons@rhein.de>
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*/
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void
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text_wordwrap(char * buffer /* Pointer to text buffer. */,
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unsigned int line_len /* Maximum line length. */)
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{
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char * p;
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char * q;
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char * lastbreak;
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unsigned int linepos;
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/* First remove all single occurances of a '\n' and crunch
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multiple blanks to one. */
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for (p = q = buffer; *p != '\0'; ) {
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if (*p == '\n') {
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if (p[1] == '\n') {
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*q++ = *p++;
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*q++ = *p++;
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}
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else {
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*q++ = ' ';
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p++;
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}
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} else if (isspace((int)*p)) {
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if (isspace((int)q[-1]))
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p++;
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else
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*q++ = *p++;
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}
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else
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*q++ = *p++;
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}
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/* Wrap the text. */
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for (p = buffer, lastbreak = NULL, linepos = 1; *p != '\0'; p++, linepos++) {
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if (*p == '\n') {
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linepos = 0;
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lastbreak = NULL;
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}
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else if (isspace((int)*p)) {
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if (linepos <= line_len) {
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lastbreak = p;
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}
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else {
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/* Wrap it. */
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if (lastbreak) {
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*lastbreak = '\n';
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p = lastbreak;
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linepos = 0;
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lastbreak = NULL;
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}
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else {
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/* Word is too long. <shrug> */
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*p = '\n';
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linepos = 0;
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lastbreak = NULL;
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}
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}
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}
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}
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if (linepos >= line_len) {
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/* Wrap it one last time. */
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if (lastbreak) {
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*lastbreak = '\n';
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p = lastbreak;
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linepos = 0;
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lastbreak = NULL;
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}
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}
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}
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