home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
C/C++ Users Group Library 1996 July
/
C-C++ Users Group Library July 1996.iso
/
vol_100
/
128_01
/
roff47.c
< prev
next >
Wrap
Text File
|
1985-03-09
|
8KB
|
312 lines
/********************************************************/
/* */
/* ROFF4, Version 1.60 */
/* */
/*(C) 1983,4 by Ernest E. Bergmann */
/* Physics, Building #16 */
/* Lehigh Univerisity */
/* Bethlehem, Pa. 18015 */
/* */
/* Permission is hereby granted for all commercial and */
/* non-commercial reproduction and distribution of this */
/* material provided this notice is included. */
/* */
/********************************************************/
/*Feb 15, 1984*/
/*January 9, 1984*/
#include "roff4.h"
/*assuming REVSCROLL is FALSE*/
/*output OUTBUF2 whith the vertical height of the mainline
specified by VLINENO,FVLINENO[they must not be changed here].
Excessive superscripting will be pushed down.*/
printout()
{int level,top,bot; /*"up" is negative;units fractional*/
int lsave,fsave;
OUTBUF2[BPOS]='\0';
fsave=FVLINENO;
lsave=VLINENO;
level=FRVAL*(PLINENO-VLINENO)+FPLINENO-FVLINENO;
if(!OLDBOT) level++;
excurs(&OUTBUF2[0],&top,&bot);
if(top>level) level=top;
if(!REVSCROLL) FVLINENO += level;
padv();
for(;level<=bot;level++)
{OCNT=0;
do {OCNT++; flp(level,FALSE); }
while(retype());
if(level<bot)
{fraction();
putchar('\n');
FPLINENO++;
}
}
flp(level,TRUE); /*update UF, XF, MCNT*/
OUTBUF2[0]=BPOS=0;
OLDLN=VLINENO=lsave;
OLDBOT=bot;
FVLINENO=fsave;
}
/****************************************/
/*moves printer vertically so that its position is specified
by VLINENO,FVLINENO*/
padv()
{int w,f; /*whole,fractional lines*/
w=VLINENO-PLINENO;
f=FVLINENO-FPLINENO;
while(f<0) {w--; f += FRVAL; }
while(f>=FRVAL) {w++; f -= FRVAL; }
if(w<0){fprintf(STDERR,"padv():VL=%d,PL=%d\n",
VLINENO,PLINENO);
if(REVSCROLL) backup(w*FRVAL+f);
else {VLINENO +=w;
FVLINENO +=f;
while(FVLINENO<0){VLINENO++;FVLINENO+=FRVAL;}
while(FVLINENO<FRVAL){VLINENO--;FVLINENO-=FRVAL;}
return;
}
}
if(FRQ) {while(f--){putchar('\n'); FPLINENO++; }
if(w){whole();while(w--){putchar('\n');PLINENO++;}}
}
else {while(w--){putchar('\n'); PLINENO++; }
if(f){fraction();while(f--){putchar('\n');FPLINENO++;}}
}
while(FPLINENO>=FRVAL) {PLINENO++; FPLINENO -= FRVAL; }
}
/****************************************/
backup(i) /*not yet implemented*/
int i; /*# of fractional lines(probably negative)*/
{fprintf(STDERR,"\nCan't back up yet\n");
}
/**************************************************/
excurs(str,t,b) /*finds the topmost and bottommost line
positions of str*/
char *str;
int *t,*b;
{int l;
char c;
*t=*b=l=0; /*current line position */
c=*str;
while(c){if(c==CFVAL){if(c=*(++str))
switch(c)
{case '+':l--; if(l<*t) *t=l;
c=*(++str); break;
case '-':l++; if(l>*b) *b=l;
c=*(++str); break;
default : c=*(++str); break;
}
}
else c=*(++str);
}
}
/**************************************************/
flp(level,updat)/*fancy line print at a given vertical level
the string in OUTBUF2[] with backspacing,
underlining, and strikout. To permit boldface
it modifies DBUF[],DPOS so that retype can be
used to patch up OUTBUF2 for resubmittal to
flp()*/
int level; /* current vertical level to print*/
int updat; /* boolean for update of UF,XF,MCNT*/
{int i;
BLKCNT=lbc(level,OUTBUF2);
FIRST=TRUE;
while((BLKCNT>0)||updat)
{prpass(level,updat); putchar('\r');
updat=FIRST=FALSE;
}
if(XCOL>-1){for(i=0;i<=XCOL;i++)
putchar(XBUF[i]);
putchar('\r');
}
if(UCOL>-1){for(i=0;i<=UCOL;i++)
putchar(UBUF[i]);
putchar('\r');
}
if((UCOL>-1)||(XCOL>-1)) initxu();
}
/**************************************************/
retype() /*restores characters into OUTBUF2 from DBUF
that need to be overstruck again*/
{int i;
if(DPOS==-1) return(FALSE);
else {for(i=0;i<=DPOS;i++)
{if(DBUF[i])
{OUTBUF2[i]=DBUF[i];
DBUF[i]=FALSE;
}
}
DPOS=-1;
return(TRUE);
}
}
/**************************************************/
int lbc(lev,str) /*counts printable chars in line level and
above; parity must be reset*/
int lev; /*=0 main line,=-1 superscripts,=+1 subscripts, etc.*/
char *str;
{char c,n;
int l;
l=n=0;
c=*str;
while(c){if(c==CFVAL){if(c=*(++str))
switch(c)
{case '+':l--;c=*(++str);break;
case '-':l++;c=*(++str);break;
default: c=*(++str);break;
} }
else {if((c>' ')&&(l<=lev)) if(c!=TCVAL) n++;
c=*(++str);
}
}
return(n);
}
/**************************************************/
prpass(lev,updat) /*printer pass initial cr; no lf anywhere*/
int lev; /*=0 main line,=-1 superscripts,=+1 subscripts, etc.*/
int updat;/*boolean to update UF,XF,MCNT*/
{char ch;
int l;
int xfs,ufs,mcnts; /*save variables*/
int p1,p2,p3; /*position holders*/
int cp2; /*for tabulation calculation*/
xfs=XF; ufs=UF; mcnts=MCNT;
p1=p2=p3=l=BPOS=CP=PP=0;
while(ch=OUTBUF2[BPOS])
{switch (class(ch))
{case BLACK:/*print it if posssible*/
if((PP>CP)||(l>lev)){CP++;BPOS++;break;}
else {while(CP>PP){putchar(' ');PP++;}
if(ch==SCVAL)putchar(' ');
else putchar(ch);PP++;
if(MCNT>OCNT)
{DBUF[BPOS]=OUTBUF2[BPOS];
if(BPOS>DPOS) DPOS=BPOS;
}
OUTBUF2[BPOS++]=' ';
if(UF&&FIRST)UBUF[UCOL=CP]=UCHAR;
if(XF&&FIRST)XBUF[XCOL=CP]=XCHAR;
BLKCNT--; CP++;
} break;
case WHITE:/*assume blank*/ CP++;BPOS++;break;
case TRANSLATE:/*similar to BLACK and WHITE*/
ch=OUTBUF2[++BPOS];
if((PP>CP)||(l>lev)||(ch==' '))
{CP++;BPOS++;break;}
else
{while(CP>PP){putchar(' ');PP++;}
trch(ch);PP++;
if(MCNT>OCNT)
{DBUF[BPOS]=OUTBUF2[BPOS];
DBUF[BPOS-1]=OUTBUF2[BPOS-1];
if(BPOS>DPOS) DPOS=BPOS;
}
OUTBUF2[BPOS++]=' ';
if(UF&&FIRST)UBUF[UCOL=CP]=UCHAR;
if(XF&&FIRST)XBUF[XCOL=CP]=XCHAR;
BLKCNT--; CP++;
} break;
case CONTROL:/*decode on following letter*/
ch=OUTBUF2[++BPOS];
if(CPTR[ch-' ']) pcont(ch);
else switch(ch)
{case 'h':
case 'H':/*backspace*/
if(CP)CP--;break;
case '+': l--; break;
case '-': l++; break;
case 'U': UF=TRUE;break;
case 'u': UF=FALSE;break;
case 'X': XF=TRUE;break;
case 'x': XF=FALSE;break;
case 'B': MCNT *=3;break;
case 'b': if(!(MCNT /=3))MCNT=1;
break;
case 'D': MCNT *=2;break;
case 'd': if(!(MCNT /=2))MCNT=1;
break;
case '(': p1=CP;break;
case ')': CP=p1;break;
case '[': p2=CP;break;
case ']': CP=p2;break;
case '{': p3=CP;break;
case '}': CP=p3;break;
default:/*?,ignore*/;break;
} BPOS++; break;
case SENTINEL: OUTBUF2[BPOS]=0;break;
case HTAB: for(cp2=0;CP>=0;cp2+=TABSIZ)CP-=TABSIZ;
CP=cp2; BPOS++; break;
case OTHERS:
fprintf(STDERR,"\nweird character value: %o\n",ch);
BPOS++;
break;
}}
if(!updat){/*restore original values*/
XF=xfs;
UF=ufs;
MCNT=mcnts;
}
}
/**************************************************/
int class(c)
char c;
{if(c==TCVAL) return(TRANSLATE);
if (c==CFVAL) return(CONTROL);
if(c>' ') return(BLACK);
if(c==' ') return(WHITE);
if(c=='\n') return(SENTINEL);
if(c=='\r') return(SENTINEL);
if(c==TAB) return(HTAB);
if(!c) return(SENTINEL);
return(OTHERS);
}
/**************************************************/
fraction() /*put printer in fractional spcing mode;
set FRQ*/
{if(!FRQ && FRSTRING && (FRVAL!=1))
{outstr(FRSTRING);
FRQ = TRUE;
}
}
/**************************************************/
whole() /*put printer in whole line spacing;
reset FRQ */
{if(FRQ && WHSTRING)
{outstr(WHSTRING);
FRQ = FALSE;
}
}
/**************************************************/
trch(c) /*output string translation of c*/
char c;
{char *p;
if(c<' ') {putchar(TCVAL);putchar(c);return;}
p = TPTR[c-' '];
if(p) outstr(p);
else {/*not initialized*/
putchar(TCVAL);
putchar('?');
}
}
/****************************************/
pcont(c) /*output printer control string for c*/
char c;
{char *p;
if(c<' ') {putchar(CFVAL);putchar(c);return;}
p = CPTR[c-' '];
if(p) outstr(p);
else {/*not initialized*/
putchar(CFVAL);
putchar('?');
}
}
return(SENTINEL);
if(c==TAB) return(