/********************************************************/
/*							*/
/*	ro_word.c	word-handling routines for ro	*/
/*							*/
/*	ro version 1.00					*/
/*							*/
/*	Portions copyright (c) 1989 by Ted A. Campbell	*/
/*		Bywater Software			*/
/*		P. O. Box 4023				*/
/*		Duke Station				*/
/*		Durham, NC  27706			*/
/*							*/
/*	Contains portions of ROFF4, Version 1.60	*/
/*      (c) 1983, 4 by Ernest E. Bergmann               */
/*		Physics, Building #16			*/
/*		Lehigh University			*/
/*		Bethlehem, Pa. 18015			*/
/*							*/
/*	Contains portions of ROFF4, Version 1.61	*/
/*      (c) 1985 by Konrad Kwok                         */
/*		20 3rd Street, Section M		*/
/*		Fariview Park,				*/
/*		Hong Kong				*/
/*							*/
/*	ro and its predecessor ROFF4 are based on 	*/
/*	the ROFF text processor described in Kernigan	*/
/*	and Plauger's now-classic text <Software Tools> */
/*							*/
/* Permission is hereby granted for all commercial and	*/
/* non-commercial reproduction and distribution of this */
/* material provided this notice is included.		*/
/*							*/
/********************************************************/

#include "ro.h"

/****************************************/

puttl3( s1, s2, s3, pageno )
	char *s1, *s2, *s3;
	int pageno;			 /*put out three part title, none
					containing '\n', with
					optional page numbering; aligning
					with page margins,0 & ro_rmval[0];*/
	{
	int size1, gap1, size2, gap2, size3, gaps, remain;
	size1 = strln3( s1, FALSE, pageno );
	ro_outtop = ro_ltop;
	ro_outbot = ro_lbot;
	size2 = strln3(s2,FALSE,pageno);
	if (ro_ltop<ro_outtop)
		ro_outtop=ro_ltop;
	size3 = strln3(s3,FALSE,pageno);
	if (ro_ltop<ro_outtop)
		ro_outtop=ro_ltop;
	gaps = ro_max( 0, ro_rmval[0]-size1-size2-size3);
	gap1 = gaps/2;
	gap2 = gaps-gap1;
	remain = ro_rmval[0];
	if ( size1 <= remain )
		{
		puttl( s1, pageno);
		remain -= size1;
		}
	if ( gap1 < remain )
		{
		blanks( gap1 );
		remain -= gap1;
		}
	if ( size2 <= remain )
		{
		puttl( s2, pageno );
		remain -= size2;
		}
	if ( gap2 < remain )
		{
		blanks( gap2 );
		remain -= gap2;
		}
	if ( size3 <= remain )
		{
		puttl( s3, pageno );
		remain -= size3;
		}
	printout();
	putchar('\r');
	}

/****************************************/

blanks( i )
	int i;	/*sends i blanks to ro_out2buf*/
	{		
	if(i<0) return;
	for( ; i ; i--) putout( BLANK );
	}

/****************************************/
/* Gets from source line three part title that it
	transfers to buffer delineated by ttl1 which has
	capacity for all three strings; none of the strings
	will contain '\n' */

gettl3( sl, ttl1, ttl2, ttl3 )
	char *sl, *ttl1, *ttl2, *ttl3;
	{
	char c, cc, *dp;

	if DEBUG fprintf( stderr,"DEBUG:  gettl3() sl = <%s> \n", sl );

	/*pass over command*/

	for ( c = *sl; c != ' ' && c != '\n' && c != '\t'; sl++ )
		{
		c = *sl;
		}

	/*advance to first non-blank or '\n' */

	for ( ; c == ' ' || c == '\t'; sl++ )
		{
		c = *sl;
		}

	/* c should now be set to the delimiter */
	/* advance beyond delimiter, if present */

	if ( c != '\n' && !c ) 
		{
		sl++;
		}

	dp = ttl1;
	transfer( &sl, &dp, c );
	dp = ttl2;
	transfer( &sl, &dp, c);
	dp = ttl3;
	transfer( &sl, &dp, c);

	if DEBUG
		{
		fprintf( stderr,"DEBUG:  delim=<%c>\nT1=<%s>\nT2=<%s>\nT3=<%s>;\n",
			c, ttl1, ttl2, ttl3);
		}

	}

/****************************************/
/* Copy string from source to destination.	Original delim.
can be \0, \n, or char.	The pointer to the source is updated
to point at the \0, \n, or past char.	In destination, delim.
is always replaced by \0.	The destination pointer always
points past this \0. */

transfer( src, dst, c )
	char c;     		/* terminal character */
	char **src;		/* source string */
	char **dst;		/* destination string */
	{
	char a;

	a = **src;
	while ( a != c && a != '\n' && a != '\0' && a )
		{
		**dst = a;	
		(*dst)++;
		(*src)++;	
		a = **src;
		}
	**dst = '\0';
	(*dst)++;
	if ( a != '\n' ) 
		{
		(*src)++;
		}
	}

/**********************************************************
 centers a line of text
**********************************************************/

center (line)
	char *line;
	{
	ro_tival = ro_max(( ro_rmval[0]+ro_tival-strln3(line,FALSE,1))/2, 0 );
	ro_outtop=ro_ltop;
	ro_outbot=ro_lbot;
	return;
	}

/************************************************************
Revised April 24,83.Transfers next word from in to out.	Scans
off leading white space from in.	If there is no word, returns
FALSE.	Otherwise, input is truncated on left of word which is
transfered to out without leading or trailling blanks.
WE_HAVE_A_WORD will be returned.	If the transfered word
terminates a sentence then ro_sentence is set to 1, otherwise it
is reset to FALSE.
**************************************************************/

int getwrd (in,	out )
	char *in, *out;
	{
	char *pin, *pout, c, cm, cp;

	skip_blanks(in);
	replace_char(in,TAB,BLANK);
	pin = in;
	pout = out;
	c = *pin;
	ro_sentence=FALSE;
	if(c==NEWLINE || c=='\0')
		{
		*out='\0';
		if DEBUG fprintf( stderr,"DEBUG:  getwrd() = <%s> \n", out );
		return(FALSE);
		}
	while(c!=BLANK && c!=NEWLINE && c)
		{
		*(pout++) = c;
		*pin = BLANK;
		c=*(++pin);
		}
	*pout = '\0';	/*terminate out string*/
	cm=*(pout-1);
	cp=*(pin+1);
	switch (cm)
		{
	case ':' :
	case ';' :
	case '?' :
	case '!' :
			ro_sentence=1;
			break;
	case '.' :
			if(cp==BLANK||cp==NEWLINE||c==NEWLINE)
				 ro_sentence=1;
		}
	if DEBUG fprintf( stderr, "DEBUG:  getwrd() = <%s> \n", out );
	return(WE_HAVE_A_WORD);
	}

/*******************************************************
Truncates white-space characters at the end of a string.
********************************************************/

trunc_bl (string)
	char *string;
	{
	char *ptr;
	int k;
	k = strlen (string);
	ptr = &string[ k-1 ];	 /* char before terminating nul */
	while (*ptr==BLANK || *ptr==TAB || *ptr==NEWLINE)		
			*ptr--	= '\0';
	}

/*********************************************
		 distribute words evenly across a line
**********************************************/

spread ( line, nextra, no_words)
	char *line;
	int nextra;	/* no. extra places left in line */
	int no_words;	 /* no. words in the line		*/
	{
	int i, j, nblanks, nholes;

	if DEBUG fprintf( stderr,"DEBUG:  spread(): line = <%s>,\n        nextra = %d, no_words = %d\n",
		 line, nextra, no_words	);

	if (nextra <= 0 || no_words <= 1)
		return;
	ro_dir = !(ro_dir);
	nholes = no_words - 1;
	trunc_bl (line);
	i = strlen(line) - 1 ; /* last character of string */
	j = ro_min(MAXLINE-2,i+nextra);	/* last	position in output */
	line[j+1] = '\0';
	for ( ; i<j ; i--, j-- )
		{ 
			line[j] = line[i];
			if ( line[i] == BLANK)
				{ 
				 if (ro_dir == 0) nblanks=(nextra-1)/nholes+1;
				 else			nblanks = nextra/nholes;
				 nextra = nextra - nblanks;
				 nholes = nholes - 1;
				 for ( ; nblanks > 0;	nblanks-- )
					line[--j] = BLANK;
				}
		}
	}

/************************************************
place portion of title line with optional page no. in ro_out2buf
*************************************************/

puttl ( str, num )
	char *str;
	int num;
	{
	int i;
	char c;
	for (i=0;c= *str; str++)
		{
			if ( c != NUMSIGN ) putout(c);
			else putnum(num);
		}
	}

/*******************************************
 put out num to ro_out2buf (conversion)
********************************************/
putnum ( num, w )
	int num;
	{
	int i, nd;
	char chars[10];
	nd = itoc ( num, chars, 10 );
	for ( i=0;i<nd; i++) putout(chars[i]);
	}

/************************************************
 convert int num to char string in numstr
*************************************************/

itoc ( num, numstr, size )
	int num;
	char *numstr;
	int size;		/* largest size of numstr */
	{
	int absnum, i, j, k, d;
	absnum = abs (num);
	numstr[0] = '\0';
	i = 0;
	do	 	{ 
			i++;
			d = absnum % 10;
			numstr[i] = d + '0';
			absnum = absnum/10;
		}
	while ( absnum != 0 && i<size );
	if ( num < 0 && i<size )
		{ 
			i++;
			numstr[i] = '-';
		}
	for( j=0; j<i; j++ )
		{ 
			k = numstr[i];
			numstr[i] = numstr[j];
			numstr[j] = k;
			i--;
		}
	return ( strlen(numstr) );
	}

/****************************************/

putout(c)		/*places c in ro_out2buf[]*/
	char c;
	{
	if(c==ro_scval[0]) c= BLANK;
	if(c==NEWLINE)c='\0';
	ro_out2buf[ro_bpos++]=c;
	ro_out2buf[ro_bpos]='\0';/*safty net*/
	}

/************************************
 replace c1 in string with c2
*************************************/

replace_char (string, c1, c2)
	char *string, c1, c2;
	{
	int i;
	for (i=0; string[i]; i++)
			if (string[i] == c1)	string[i] = c2;
	}