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/* $Id: wordwrap.cc,v 1.5 1997/03/23 13:52:15 dps Exp $ */
/* Wordwrap function for library */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "tblock.h"
#define __EXCLUDE_READER_CLASSES
#include "lib.h"
/* Word wrap text into lines of length room */
tblock *word_wrap(const char *txt, const char *nl, const char *expl_nl,
const int room, const int ilen=0)
{
struct tblock *ans;
const char *wptr, *sc;
int wlen, croom, flg;
int nl_len; // Performance hack
ans=new(tblock);
wlen=0;
wptr=sc=txt;
croom=room-ilen;
nl_len=strlen(nl);
flg=0;
while (1)
{
/* FIXME: huge words might cause an oversize line */
/* (this is not a typesetting program like *roff) */
if (isspace(*sc) || *sc=='\n' || *sc=='\0')
{
if (wlen+flg>croom)
{
ans->add(nl,nl_len);
croom=room;
flg=0;
}
if (wlen>0)
{
if (flg)
{
ans->add(' ');
croom--;
}
ans->add(wptr, wlen);
croom-=wlen;
flg=1;
}
if (*sc=='\n')
{
ans->add(expl_nl);
croom=room;
flg=0;
}
wlen=0;
}
else
{
if (wlen==0)
wptr=sc;
wlen++;
}
if (*sc=='\0') break; // Stop condition
sc++;
}
return ans;
}
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