[unix-history] / usr / src / usr.bin / f77 / libI77 / fmt.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
*      @(#)fmt.c       5.3     %G%
*/

/*
* fortran format parser
*/

#include "fio.h"
#include "format.h"

#define isdigit(x)      (x>='0' && x<='9')
#define isspace(s)      (s==' ')
#define skip(s)         while(isspace(*s)) s++

#ifdef interdata
#define SYLMX 300
#endif

#ifdef pdp11
#define SYLMX 300
#endif

#ifdef vax
#define SYLMX 300
#endif

#ifdef tahoe
#define SYLMX 300
#endif

#ifdef hp300
#define SYLMX 300
#endif

LOCAL struct syl syl_vec[SYLMX];
struct syl *syl_ptr;
LOCAL int parenlvl,revloc;
int low_case[256];
short pc;
char *f_s(), *f_list(), *i_tem(), *gt_num(), *ap_end();
char *s_init;

pars_f()
{
       short *s_ptr;
       long  *l_ptr;
       int i;

       /* first time, initialize low_case[] */
       if( low_case[1] == 0 ) {
           for(i = 0; i<256; i++) low_case[i]=i;
           for(i = 'A'; i<='Z'; i++) low_case[i]=i-'A'+'a';
       }

       parenlvl=revloc=pc=0;

       s_ptr = (short *) fmtbuf;
       if( *s_ptr == FMT_COMP ) {
               /* already compiled - copy value of pc */
               pc = *(s_ptr+1);
               /* get address of the format */
               l_ptr = (long *) fmtbuf;
               fmtbuf = s_init = (char *) *(l_ptr+1);
               /* point syl_ptr to the compiled format */
               syl_ptr = (struct syl *) (l_ptr + 2);
               return(OK);
       } else {
               syl_ptr = syl_vec;
               s_init = fmtbuf;
               return((f_s(fmtbuf,0)==FMTERR)? ERROR : OK);
       }
}

LOCAL
char *f_s(s,curloc) char *s;
{
       skip(s);
       if(*s++!='(')
       {
               fmtptr = s;
               return(FMTERR);
       }
       if(parenlvl++ ==1) revloc=curloc;
       op_gen(RET,curloc,0,0,s);
       if((s=f_list(s))==FMTERR)
       {
               return(FMTERR);
       }
       skip(s);
       return(s);
}

LOCAL
char *f_list(s) char *s;
{
       while (*s)
       {       skip(s);
               if((s=i_tem(s))==FMTERR) return(FMTERR);
               skip(s);
               if(*s==',') s++;
               else if(*s==')')
               {       if(--parenlvl==0)
                               op_gen(REVERT,revloc,0,0,s);
                       else
                               op_gen(GOTO,0,0,0,s);
                       return(++s);
               }
       }
       fmtptr = s;
       return(FMTERR);
}

LOCAL
char *i_tem(s) char *s;
{       char *t;
       int n,curloc;
       if(*s==')') return(s);
       if ((n=ne_d(s,&t))==FMTOK)
               return(t);
       else if (n==FMTERR)
               return(FMTERR);
       if ((n=e_d(s,&t))==FMTOK)
               return(t);
       else if (n==FMTERR)
               return(FMTERR);
       s=gt_num(s,&n);
       if (n == 0) { fmtptr = s; return(FMTERR); }
       curloc = op_gen(STACK,n,0,0,s);
       return(f_s(s,curloc));
}

LOCAL
ne_d(s,p) char *s,**p;
{       int n,x,sign=0,pp1,pp2;
       switch(low_case[*s])
       {
       case ':': op_gen(COLON,(int)('\n'),0,0,s); break;
#ifndef KOSHER
       case '$': op_gen(DOLAR,(int)('\0'),0,0,s); break;  /*** NOT STANDARD FORTRAN ***/
#endif
       case 'b':
               switch(low_case[*(s+1)])
               {
                       case 'n': s++; op_gen(BNZ,0,0,0,s); break;
                       case 'z': s++; op_gen(BNZ,1,0,0,s); break;
#ifndef KOSHER
                       default: op_gen(B,0,0,0,s); break;  /*** NOT STANDARD FORTRAN ***/
#else
                       default: fmtptr = s; return(FMTUNKN);
#endif
               }
               break;
       case 's':
               switch(low_case[*(s+1)])
               {
                       case 'p': s++; x=SP; pp1=1; pp2=1; break;
#ifndef KOSHER
                       case 'u': s++; x=SU; pp1=0; pp2=0; break;  /*** NOT STANDARD FORTRAN ***/
#endif
                       case 's': s++; x=SS; pp1=0; pp2=1; break;
                       default:  x=S; pp1=0; pp2=1; break;
               }
               op_gen(x,pp1,pp2,0,s);
               break;
       case '/': op_gen(SLASH,0,0,0,s); break;

       case '-': sign=1;       /* OUTRAGEOUS CODING */
       case '+': s++;          /* OUTRAGEOUS CODING */
       case '0': case '1': case '2': case '3': case '4':
       case '5': case '6': case '7': case '8': case '9':
               s=gt_num(s,&n);
               switch(low_case[*s])
               {
               case 'p': if(sign) n= -n; op_gen(P,n,0,0,s); break;
#ifndef KOSHER
               case 'r': if(n<=1)              /*** NOT STANDARD FORTRAN ***/
                       {       fmtptr = --s; return(FMTERR); }
                       op_gen(R,n,0,0,s); break;
               case 't': op_gen(T,0,n,0,s); break;     /* NOT STANDARD FORT */
#endif
               case 'x': op_gen(X,n,0,0,s); break;
               case 'h': op_gen(H,n,(s+1)-s_init,0,s);
                       s+=n;
                       break;
               default: fmtptr = s; return(FMTUNKN);
               }
               break;
       case GLITCH:
       case '"':
       case '\'': op_gen(APOS,s-s_init,0,0,s);
               *p = ap_end(s);
               return(FMTOK);
       case 't':
               switch(low_case[*(s+1)])
               {
                       case 'l': s++; x=TL; break;
                       case 'r': s++; x=TR; break;
                       default:  x=T; break;
               }
               if(isdigit(*(s+1))) {s=gt_num(s+1,&n); s--;}
#ifdef KOSHER
               else { fmtptr = s; return(FMTERR); }
#else
               else n = 0;     /* NOT STANDARD FORTRAN, should be error */
#endif
               op_gen(x,n,1,0,s);
               break;
       case 'x': op_gen(X,1,0,0,s); break;
       case 'p': op_gen(P,0,0,0,s); break;
#ifndef KOSHER
       case 'r': op_gen(R,10,1,0,s); break;  /*** NOT STANDARD FORTRAN ***/
#endif

       default: fmtptr = s; return(FMTUNKN);
       }
       s++;
       *p=s;
       return(FMTOK);
}

LOCAL
e_d(s,p) char *s,**p;
{       int n,w,d,e,x=0, rep_count;
       char *sv=s;
       char c;
       s=gt_num(s,&rep_count);
       if (rep_count == 0) goto ed_err;
       c = low_case[*s]; s++;
       switch(c)
       {
       case 'd':
       case 'e':
       case 'g':
               s = gt_num(s, &w);
               if (w==0) goto ed_err;
               if(*s=='.')
               {       s++;
                       s=gt_num(s,&d);
               }
               else d=0;
               if(low_case[*s] == 'e'
#ifndef KOSHER
               || *s == '.'             /*** '.' is NOT STANDARD FORTRAN ***/
#endif
               )
               {       s++;
                       s=gt_num(s,&e);
                       if (e==0 || e>127 || d>127 ) goto ed_err;
                       if(c=='e') n=EE; else if(c=='d') n=DE; else n=GE;
                       op_gen(n,w,d + (e<<8),rep_count,s);
               }
               else
               {
                       if(c=='e') n=E; else if(c=='d') n=D; else n=G;
                       op_gen(n,w,d,rep_count,s);
               }
               break;
       case 'l':
               s = gt_num(s, &w);
               if (w==0) goto ed_err;
               op_gen(L,w,0,rep_count,s);
               break;
       case 'a':
               skip(s);
               if(isdigit(*s))
               {       s=gt_num(s,&w);
#ifdef  KOSHER
                       if (w==0) goto ed_err;
#else
                       if (w==0) op_gen(A,0,0,rep_count,s);
                       else
#endif
                       op_gen(AW,w,0,rep_count,s);
                       break;
               }
               op_gen(A,0,0,rep_count,s);
               break;
       case 'f':
               s = gt_num(s, &w);
               if (w==0) goto ed_err;
               if(*s=='.')
               {       s++;
                       s=gt_num(s,&d);
               }
               else d=0;
               op_gen(F,w,d,rep_count,s);
               break;
#ifndef KOSHER
       case 'o':       /*** octal format - NOT STANDARD FORTRAN ***/
       case 'z':       /*** hex   format - NOT STANDARD FORTRAN ***/
#endif
       case 'i':
               s = gt_num(s, &w);
               if (w==0) goto ed_err;
               if(*s =='.')
               {
                       s++;
                       s=gt_num(s,&d);
                       x = IM;
               }
               else
               {       d = 1;
                       x = I;
               }
#ifndef KOSHER
               if (c == 'o')
                       op_gen(R,8,1,rep_count,s);
               else if (c == 'z')
                       op_gen(R,16,1,rep_count,s);
#endif
               op_gen(x,w,d,rep_count,s);
#ifndef KOSHER
               if (c == 'o' || c == 'z')
                       op_gen(R,10,1,rep_count,s);
#endif
               break;
       default:
               *p = sv;
               fmtptr = s;
               return(FMTUNKN);
       }
       *p = s;
       return(FMTOK);
ed_err:
       fmtptr = --s;
       return(FMTERR);
}

LOCAL
op_gen(a,b,c,rep,s) char *s;
{       struct syl *p= &syl_ptr[pc];
       if(pc>=SYLMX)
       {       fmtptr = s;
               fatal(F_ERFMT,"format too complex");
       }
       if( b>32767 || c>32767 || rep>32767 )
       {       fmtptr = s;
               fatal("field width or repeat count too large");
       }
#ifdef DEBUG
       fprintf(stderr,"%3d opgen: %d %d %d %d %c\n",
               pc,a,b,c,rep,*s==GLITCH?'"':*s); /* for debug */
#endif
       p->op=a;
       p->p1=b;
       p->p2=c;
       p->rpcnt=rep;
       return(pc++);
}

LOCAL
char *gt_num(s,n) char *s; int *n;
{       int m=0,a_digit=NO;
       skip(s);
       while(isdigit(*s) || isspace(*s))
       {
               if (isdigit(*s))
               {
                       m = 10*m + (*s)-'0';
                       a_digit = YES;
               }
               s++;
       }
       if(a_digit) *n=m;
       else *n=1;
       return(s);
}

LOCAL
char *ap_end(s) char *s;
{
       char quote;
       quote = *s++;
       for(;*s;s++)
       {
               if(*s==quote && *++s!=quote) return(s);
       }
       fmtptr = s;
       fatal(F_ERFMT,"bad string");
}