207 lines
3.4 KiB
C
207 lines
3.4 KiB
C
/* $Id$ */
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* I N T E R M E D I A T E C O D E
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*
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* I C _ I O . C
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*/
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#include <stdio.h>
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#include <em_pseu.h>
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#include <em_spec.h>
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#include <arch.h>
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#include "../share/types.h"
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#include "../share/debug.h"
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#include "ic.h"
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#include "ic_lookup.h"
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#include "../share/alloc.h"
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#include "ic_io.h"
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STATIC short libstate;
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STATIC long bytecnt;
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STATIC FILE *infile; /* The current EM input file */
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STATIC int readbyte()
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{
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if (libstate == ARCHIVE && bytecnt-- == 0L) {
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/* If we're reading from an archive file, we'll
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* have to count the number of characters read,
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* to know where the current module ends.
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*/
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return EOF;
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}
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return getc(infile);
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}
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short readshort() {
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register int l_byte, h_byte;
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l_byte = readbyte();
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h_byte = readbyte();
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if ( h_byte>=128 ) h_byte -= 256 ;
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return l_byte | (h_byte*256) ;
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}
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#ifdef LONGOFF
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offset readoffset() {
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register long l;
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register int h_byte;
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l = readbyte();
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l |= ((unsigned) readbyte())*256 ;
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l |= readbyte()*256L*256L ;
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h_byte = readbyte() ;
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if ( h_byte>=128 ) h_byte -= 256 ;
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return l | (h_byte*256L*256*256L) ;
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}
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#endif
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short get_int() {
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switch(table2()) {
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default: error("int expected");
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case CSTX1:
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return(tabval);
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}
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}
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char readchar()
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{
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return(readbyte());
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}
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offset get_off() {
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switch (table2()) {
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default: error("offset expected");
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case CSTX1:
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return((offset) tabval);
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#ifdef LONGOFF
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case CSTX2:
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return(tabval2);
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#endif
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}
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}
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STATIC make_string(n) int n; {
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sprintf(string,".%u",n);
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}
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STATIC inident() {
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register n;
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register char *p = string;
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register c;
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n = get_int();
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while (n--) {
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c = readbyte();
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if (p<&string[IDL])
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*p++ = c;
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}
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*p++ = 0;
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}
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int table3(n) int n; {
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switch (n) {
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case sp_ilb1: tabval = readbyte(); return(ILBX);
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case sp_ilb2: tabval = readshort(); return(ILBX);
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case sp_dlb1: make_string(readbyte()); return(DLBX);
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case sp_dlb2: make_string(readshort()); return(DLBX);
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case sp_dnam: inident(); return(DLBX);
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case sp_pnam: inident(); return(n);
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case sp_cst2: tabval = readshort(); return(CSTX1);
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#ifdef LONGOFF
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case sp_cst4: tabval2 = readoffset(); return(CSTX2);
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#endif
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case sp_doff: if (table2()!=DLBX) error("symbol expected");
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switch(table2()) {
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default: error("offset expected");
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case CSTX1: return(VALX1);
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#ifdef LONGOFF
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case CSTX2: return(VALX2);
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#endif
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}
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default: return(n);
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}
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}
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int table1() {
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register n;
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n = readbyte();
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if (n == EOF)
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return(ATEOF);
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if ((n <= sp_lmnem) && (n >= sp_fmnem)) {
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tabval = n;
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return(INST);
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}
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if ((n <= sp_lpseu) && (n >= sp_fpseu)) {
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tabval = n;
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return(PSEU);
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}
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if ((n < sp_filb0 + sp_nilb0) && (n >= sp_filb0)) {
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tabval = n - sp_filb0;
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return(ILBX);
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}
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return(table3(n));
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}
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int table2() {
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register n;
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n = readbyte();
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if ((n < sp_fcst0 + sp_ncst0) && (n >= sp_fcst0)) {
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tabval = n - sp_zcst0;
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return(CSTX1);
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}
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return(table3(n));
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}
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file_init(f,state,length)
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FILE *f;
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short state;
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long length;
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{
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short n;
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infile = f;
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libstate = state;
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bytecnt = length;
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linecount = 0;
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n = readshort();
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if (n != (short) sp_magic) {
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error("wrong magic number: %d", n);
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}
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}
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arch_init(arch)
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FILE *arch;
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{
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short n;
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infile = arch;
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n = readshort();
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if (n != (short)ARMAG && n != (short)AALMAG) {
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error("wrong archive magic number: %d",n);
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}
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}
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