/*
	history...
		19 Sept 84  Can send output to a file using
			putc() or STDOUT using putchar().
		3 Aug 84  Calling putchar() directly rather
			than through cout().
		10 Aug 83  changed back to &argcnt+i-1.
		8 Aug 83  Changed addr of first arg to
			&argcnt + i + 1.
*/
#include iolib.h
#include printf1.h
#define NULL 0
#define ERR -1

int device;

/*
** printf(controlstring, arg, arg, ...)  or 
** printf(file, controlstring, arg, arg, ...) -- formatted print
**        operates as described by Kernighan & Ritchie
**        only d, x, c, s, and u specs are supported.
*/
printf(argcnt) int argcnt; {
  int i, width, prec, preclen, len, *nxtarg;
  char *ctl, *cx, c, right, str[7], *sptr, pad;
  i = argc();   /* fetch arg count from A reg first */
  nxtarg = &argcnt + i - 1;
  ctl = device = *nxtarg;
  if (device==(device&31))	/* *small* value must be device # */
	{ctl=*--nxtarg;}
  else device=0;
  while(c=*ctl++) {
    if(c!='%') {_outc(c); continue;}
    if(*ctl=='%') {_outc(*ctl++); continue;}
    cx=ctl;
    if(*cx=='-') {right=0; ++cx;} else right=1;
    if(*cx=='0') {pad='0'; ++cx;} else pad=' ';
    if((i=utoi(cx, &width)) >= 0) cx=cx+i; else continue;
    if(*cx=='.') {
      if((preclen=utoi(++cx, &prec)) >= 0) cx=cx+preclen;
      else continue;
      }
    else preclen=0;
    sptr=str; c=*cx++; i=*(--nxtarg);
    if(c=='d') itod(i, str, 7);
    else if(c=='x') itox(i, str, 7);
    else if(c=='c') {str[0]=i; str[1]=NULL;}
    else if(c=='s') sptr=i;
    else if(c=='u') itou(i, str, 7);
    else continue;
    ctl=cx; /* accept conversion spec */
    if(c!='s') while(*sptr==' ') ++sptr;
    len=-1; while(sptr[++len]); /* get length */
    if((c=='s')&(len>prec)&(preclen>0)) len=prec;
    if(right) while(((width--)-len)>0) _outc(pad);
    while(len) {_outc(*sptr++); --len; --width;}
    while(((width--)-len)>0) _outc(pad);
    }
  }


/*
** utoi -- convert unsigned decimal string to integer nbr
**          returns field size, else ERR on error
*/
utoi(decstr, nbr)  char *decstr;  int *nbr;  {
  int d,t; d=0;
  *nbr=0;
  while((*decstr>='0')&(*decstr<='9')) {
    t=*nbr;t=(10*t) + (*decstr++ - '0');
    if ((t>=0)&(*nbr<0)) return ERR;
    d++; *nbr=t;
    }
  return d;
  }


/*
** itod -- convert nbr to signed decimal string of width sz
**         right adjusted, blank filled; returns str
**
**        if sz > 0 terminate with null byte
**        if sz = 0 find end of string
**        if sz < 0 use last byte for data
*/
itod(nbr, str, sz)  int nbr;  char str[];  int sz;  {
  char sgn;
  if(nbr<0) {nbr = -nbr; sgn='-';}
  else sgn=' ';
  if(sz>0) str[--sz]=NULL;
  else if(sz<0) sz = -sz;
  else while(str[sz]!=NULL) ++sz;
  while(sz) {
    str[--sz]=(nbr%10+'0');
    if((nbr=nbr/10)==0) break;
    }
  if(sz) str[--sz]=sgn;
  while(sz>0) str[--sz]=' ';
  return str;
  }


/*
** itou -- convert nbr to unsigned decimal string of width sz
**         right adjusted, blank filled; returns str
**
**        if sz > 0 terminate with null byte
**        if sz = 0 find end of string
**        if sz < 0 use last byte for data
*/
itou(nbr, str, sz)  int nbr;  char str[];  int sz;  {
  int lowbit;
  if(sz>0) str[--sz]=NULL;
  else if(sz<0) sz = -sz;
  else while(str[sz]!=NULL) ++sz;
  while(sz) {
    lowbit=nbr&1;
    nbr=(nbr>>1)&32767;  /* divide by 2 */
    str[--sz]=((nbr%5)<<1)+lowbit+'0';
    if((nbr=nbr/5)==0) break;
    }
  while(sz) str[--sz]=' ';
  return str;
  }


/*
** itox -- converts nbr to hex string of length sz
**         right adjusted and blank filled, returns str
**
**        if sz > 0 terminate with null byte
**        if sz = 0 find end of string
**        if sz < 0 use last byte for data
*/
itox(nbr, str, sz)  int nbr;  char str[];  int sz;  {
  int digit, offset;
  if(sz>0) str[--sz]=NULL;
  else if(sz<0) sz = -sz;
  else while(str[sz]!=NULL) ++sz;
  while(sz) {
    digit=nbr&15; nbr=(nbr>>4)&4095;
    if(digit<10) offset=48; else offset=55;
    str[--sz]=digit+offset;
    if(nbr==0) break;
    }
  while(sz) str[--sz]=' ';
  return str;
  }

_outc(c) char c;
{	if(device) putc(c,device);
	else putchar(c);
}
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