source: buchla-68k/orig/GP/NEWLINE.C@ ee49131

/*
   ============================================================================
        newline.c -- standard pagination functions
        Version 6 -- 1988-11-02 -- D.N. Lynx Crowe
   ============================================================================
*/

#include "stdio.h"
#include "stddefs.h"
#include "pageparm.h"

#ifndef VERSION
#define VERSION "0.00 (Experimental)"
#endif

int     pgmhdr();               /* forward declaration */

/* variables for pagination functions */

int     npage    = 1;           /* current page number */
int     nline    = NLPAGE;      /* current line number */
int     nlpage   = NLPAGE;      /* number of lines per page */
int     martop   = MTOP;        /* top margin size -- lines */
int     marbot   = MBOT;        /* bottom margin size -- lines */
int     marsize  = MARGIN;      /* left margin size -- characters */
int     newsub   = 1;           /* flag for new sub-heading */
int     minleft  = MINLEFT;     /* minimum remaining lines on the page */

int (*prhead)()  = pgmhdr;      /* pointer to page heading routine */

char    *hdr     = "?????";     /* pointer to program header (for pgmhdr) */
char    *subhdg  = "";          /* pointer to subheading */
char    *verstr  = VERSION;     /* pointer to version string */

FILE    *printer;               /* printer file pointer */

/* 
 */

/*
   ============================================================================
        newline(fp) -- advance line counter before printing a new line

                Invoke this function BEFORE printing a new line.

                Uses:   nlpage = number of lines per page,
                        nline  = current line number,
                        npage  = current page number

                Invokes (*prhead)(fp) if nline overflows.  

                Initialize:

                        npage  = 1, 
                        nline  = nlpage,
                        prhead = address of page heading routine

                before first line on page is printed.
   ============================================================================
*/

newline(fp)
FILE *fp;
{
        if (nline++ GE (nlpage - (martop + marbot))) {

                nline = 1;              /* set current line number = 1 */
                fprintf(fp, "\f");      /* force new page */
                (*prhead)(fp);          /* call page heading routine */
                npage++;                /* update page number */
        }
}


/* 
 */

/*
   ============================================================================
        margin(fp) -- print spaces for a left margin

                marsize = number of blanks for left margin
   ============================================================================
*/

margin(fp)
FILE *fp;
{
        int n;

        for (n = 0; n < marsize; n++)
                putc(' ', fp);
}

/* 
 */

/*
   ============================================================================
        pgmhdr(fp) -- print program header

                Prints a standard 2+martop line program heading
                including version and page number on the second line.

                hdr = pointer to program heading line (must include a newline)
   ============================================================================
*/

pgmhdr(fp)
FILE *fp;
{
        int     n;

        for (n = 0; n < martop; n++) {
                fprintf(fp, "\n");
                nline++;
        }

        margin(fp);
        fprintf(fp, "%s\n", hdr);
        nline++;

        margin(fp);
        fprintf(fp, "Version %s                                Page %4.4d\n\n", 
                verstr, npage);
        nline++;
        nline++;
}


/* 
 */

/*
   ============================================================================
        skipnl(fp, n) -- output n newlines to fp
   ============================================================================
*/

skipnl(fp, n)
FILE *fp;
int n;
{
        int     j;

        if (n LE 0)
                return;

        for (j = 0; j < n; j++) {

                newline(fp);
                fprintf(fp, "\n");
        }
}

/* 
 */

/*
   ============================================================================
        subhdr(fp) -- standard subheading function
   ============================================================================
*/

subhdr(fp)
FILE *fp;
{
        if (newsub) {           /* new sub-heading */

                newsub = FALSE;
                newline(fp);
                newline(fp);
                margin(fp);
                fprintf(fp, "%s\n\n", subhdg);

        } else {                /* continuation of old sub heading */

                newline(fp);
                newline(fp);
                margin(fp);
                fprintf(fp, "%s -- Continued\n\n", subhdg);
        }
}

/* 
 */

/*
   ============================================================================
        heading(fp) -- standard heading function
   ============================================================================
*/

heading(fp)
FILE *fp;
{
        newline(fp);
        pgmhdr(fp);
        subhdr(fp);
}

/* 
 */

/*
   ============================================================================
        newsect(fp) -- standard new section function

        Invoke to begin a new section BEFORE printing the first line of the
        section, and BEFORE calling newline().  For example,

                subhdg = "Sub-heading for this section.";
                newsect(fp);
                newline(fp);
                printf(fp, "your line goes here");

        This will force a page break if there are not at least 'minleft'
        left on the page.
   ============================================================================
*/

newsect(fp)
FILE *fp;
{
        newsub = TRUE;

        if (nline NE nlpage) {

                if (nline > (nlpage - minleft))
                        nline = nlpage;
                else
                        subhdr(fp);
        }
}