/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)kdb_format.c	7.4 (Berkeley) 12/15/86
 */

#include "../kdb/defs.h"

char	*BADMOD;
char	*ADWRAP;

char	*lp;
char	lastc,peekc;
long	expv;

scanform(icount,ifp,itype,ptype)
	long icount;
	char *ifp;
{
	register char *fp;
	char modifier;
	register fcount, init=1;
	long savdot;
	int exact;

	while (icount) {
		fp=ifp;
		savdot=dot; init=0;
		if (!init && (exact=(findsym(dot,ptype)==0)) && maxoff)
			printf("\n%s:%16t",cursym->n_un.n_name);
		/*now loop over format*/
		while (*fp && errflg==0) {
			if (isdigit(modifier = *fp)) {
				fcount = 0;
				while (isdigit(modifier = *fp++)) {
				   fcount *= 10;
				   fcount += modifier-'0';
				}
				fp--;
			} else
				fcount = 1;
			if (*fp==0)
				break;
#ifdef	ENTRYMASK
			/* check for entry mask */
			if (exact && dot==savdot && 
			   (cursym->n_type&N_TYPE)==N_TEXT &&
			   cursym->n_un.n_name[0]=='_' && *fp=='i') {
				(void) exform(1,"x",itype,ptype);
				fp++;
				printc(EOR);
			} else
#endif
				fp = exform(fcount,fp,itype,ptype);
		}
		dotinc=dot-savdot;
		dot=savdot;

		if (errflg) {
			if (icount<0) {
				 errflg=0;
				 break;
			}
			error(errflg);
		}
		if (--icount)
			dot=inkdot(dotinc);
		if (mkfault)
			error((char *)0);
	}
}

/*
 * Execute single format item `fcount' times
 * sets `dotinc' and moves `dot'
 * returns address of next format item
 */
char *
exform(fcount,ifp,itype,ptype)
	int fcount;
	char *ifp;
{
	register POS w;
	register long savdot, wx;
	register char *fp;
	char c, modifier, longpr;

	while (fcount>0) {
	  	fp = ifp; c = *fp;
		longpr = (isupper(c) || c=='f' || c=='4' || c=='p');
		if (itype != NSP && *fp != 'a') {
			wx = get(dot, itype);
			w = shorten(wx);
		} else {
			wx = w = dot;
			if (itype == NSP &&
			    (c == 'b' || c == 'B' ||
			     c == 'c' || c == 'C' || c == '1'))
				w = btol(wx);
		}
		if (errflg)
			return (fp);
		if (mkfault)
			error((char *)0);
		var[0] = wx;
		modifier = *fp++;
		dotinc = (longpr ? sizeof (long):sizeof (short));

		if (charpos()==0 && modifier!='a')
			printf("%16m");
		switch (modifier) {

		case SP: case TB:
			break;

		case 't': case 'T':
			printf("%T",fcount); return (fp);

		case 'r': case 'R':
			printf("%M",fcount); return (fp);

		case 'a':
			psymoff(dot,ptype,":%16t"); dotinc=0; break;

		case 'p':
			psymoff(var[0],ptype,"%16t"); break;

		case 'u':
			printf("%-8u",w); break;

		case 'U':
			printf("%-16U",wx); break;

		case 'c': case 'C':
			if (modifier == 'C')
				printesc((int)byte(w));
			else
				printc((char)byte(w));
			dotinc=1; break;

		case 'b': case 'B':
			printf("%-8o", byte(w)); dotinc=1; break;

		case '1':
			printf("%-8R", byte(w)); dotinc=1; break;

		case 'w': case '2':
			printf("%-8R", w); break;

		case 'W': case '4':
			printf("%-16R", wx); break;

		case 's': case 'S':
			savdot=dot; dotinc=1;
			while ((c=byte(get(dot,itype))) && errflg==0) {
				dot=inkdot(1);
				if (modifier == 'S')
					printesc((int)c);
				else
					printc(c);
				endline();
			}
			dotinc=dot-savdot+1; dot=savdot; break;

		case 'x':
			printf("%-8x",w); break;

		case 'X':
			printf("%-16X", wx); break;

		case 'z':
			printf("%-8z",w); break;

		case 'Z':
			printf("%-16Z", wx); break;

		case 'Y':
			printf("%-24Y", wx); break;

		case 'q':
			printf("%-8q", w); break;

		case 'Q':
			printf("%-16Q", wx); break;

		case 'o':
			printf("%-8o", w); break;

		case 'O':
			printf("%-16O", wx); break;

		case 'i': case 'I':
			printins(itype,wx); printc(EOR); break;

		case 'd':
			printf("%-8d", w); break;

		case 'D':
			printf("%-16D", wx); break;

		case 'n': case 'N':
			printc('\n'); dotinc=0; break;

		case '"':
			dotinc=0;
			while (*fp != '"' && *fp)
				printc(*fp++);
			if (*fp)
				fp++;
			break;

		case '^':
			dot=inkdot(-dotinc*fcount); return (fp);

		case '+':
			dot=inkdot(fcount); return (fp);

		case '-':
			dot=inkdot(-fcount); return (fp);

		default:
			error(BADMOD);
		}
		if (itype!=NSP)
			dot=inkdot(dotinc);
		fcount--; endline();
	}
	return (fp);
}

static
printesc(c)
	register int c;
{

	c &= STRIP;
	if (c==0177 || c<SP)
		printf("^%c", c ^ 0100);
	else
		printc(c);
}

long
inkdot(incr)
{
	register long newdot;

	newdot=dot+incr;
	if (addrwrap(dot, newdot))
		error(ADWRAP);
	return (newdot);
}