File:  [gforth] / gforth / Attic / main.c
Revision 1.58: download - view: text, annotated - select for diffs
Sun Mar 23 21:22:03 1997 UTC (25 years, 3 months ago) by pazsan
Branches: MAIN
CVS tags: v0-3-0, HEAD
Added DOS-gforth-makeimage
Changes for DOS

    1: /* command line interpretation, image loading etc. for Gforth
    2: 
    3: 
    4:   Copyright (C) 1995 Free Software Foundation, Inc.
    5: 
    6:   This file is part of Gforth.
    7: 
    8:   Gforth is free software; you can redistribute it and/or
    9:   modify it under the terms of the GNU General Public License
   10:   as published by the Free Software Foundation; either version 2
   11:   of the License, or (at your option) any later version.
   12: 
   13:   This program is distributed in the hope that it will be useful,
   14:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   15:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16:   GNU General Public License for more details.
   17: 
   18:   You should have received a copy of the GNU General Public License
   19:   along with this program; if not, write to the Free Software
   20:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   21: */
   22: 
   23: #include "config.h"
   24: #include <errno.h>
   25: #include <ctype.h>
   26: #include <stdio.h>
   27: #include <string.h>
   28: #include <math.h>
   29: #include <sys/types.h>
   30: #include <sys/stat.h>
   31: #include <fcntl.h>
   32: #include <assert.h>
   33: #include <stdlib.h>
   34: #if HAVE_SYS_MMAN_H
   35: #include <sys/mman.h>
   36: #endif
   37: #include "forth.h"
   38: #include "io.h"
   39: #include "getopt.h"
   40: #include "version.h"
   41: 
   42: #define PRIM_VERSION 1
   43: /* increment this whenever the primitives change in an incompatible way */
   44: 
   45: #ifdef MSDOS
   46: jmp_buf throw_jmp_buf;
   47: #  ifndef DEFAULTPATH
   48: #    define DEFAULTPATH "."
   49: #  endif
   50: #endif
   51: 
   52: #if defined(DIRECT_THREADED) 
   53: #  define CA(n)	(symbols[(n)])
   54: #else
   55: #  define CA(n)	((Cell)(symbols+(n)))
   56: #endif
   57: 
   58: #define maxaligned(n)	(typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
   59: 
   60: static UCell dictsize=0;
   61: static UCell dsize=0;
   62: static UCell rsize=0;
   63: static UCell fsize=0;
   64: static UCell lsize=0;
   65: int offset_image=0;
   66: static int clear_dictionary=0;
   67: static int debug=0;
   68: static size_t pagesize=0;
   69: char *progname;
   70: 
   71: /* image file format:
   72:  *  "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.3.0 -i\n")
   73:  *   padding to a multiple of 8
   74:  *   magic: "Gforth1x" means format 0.2,
   75:  *              where x is even for big endian and odd for little endian
   76:  *              and x & ~1 is the size of the cell in bytes.
   77:  *  padding to max alignment (no padding necessary on current machines)
   78:  *  ImageHeader structure (see below)
   79:  *  data (size in ImageHeader.image_size)
   80:  *  tags ((if relocatable, 1 bit/data cell)
   81:  *
   82:  * tag==1 means that the corresponding word is an address;
   83:  * If the word is >=0, the address is within the image;
   84:  * addresses within the image are given relative to the start of the image.
   85:  * If the word =-1 (CF_NIL), the address is NIL,
   86:  * If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
   87:  * If the word =CF(DODOES), it's a DOES> CFA
   88:  * If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
   89:  *					possibly containing a jump to dodoes)
   90:  * If the word is <CF(DOESJUMP), it's a primitive
   91:  */
   92: 
   93: typedef struct {
   94:   Address base;		/* base address of image (0 if relocatable) */
   95:   UCell checksum;	/* checksum of ca's to protect against some
   96: 			   incompatible	binary/executable combinations
   97: 			   (0 if relocatable) */
   98:   UCell image_size;	/* all sizes in bytes */
   99:   UCell dict_size;
  100:   UCell data_stack_size;
  101:   UCell fp_stack_size;
  102:   UCell return_stack_size;
  103:   UCell locals_stack_size;
  104:   Xt *boot_entry;	/* initial ip for booting (in BOOT) */
  105:   Xt *throw_entry;	/* ip after signal (in THROW) */
  106:   Cell unused1;		/* possibly tib stack size */
  107:   Cell unused2;
  108:   Address data_stack_base; /* this and the following fields are initialized by the loader */
  109:   Address fp_stack_base;
  110:   Address return_stack_base;
  111:   Address locals_stack_base;
  112: } ImageHeader;
  113: /* the image-header is created in main.fs */
  114: 
  115: void relocate(Cell *image, char *bitstring, int size, Label symbols[])
  116: {
  117:   int i=0, j, k, steps=(size/sizeof(Cell))/8;
  118:   char bits;
  119: /*   static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
  120: 
  121: /*  printf("relocating %x[%x]\n", image, size); */
  122:    
  123:   for(k=0; k<=steps; k++)
  124:     for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1) {
  125:       /*      fprintf(stderr,"relocate: image[%d]\n", i);*/
  126:       if(bits & 0x80) {
  127: 	/* fprintf(stderr,"relocate: image[%d]=%d\n", i, image[i]);*/
  128: 	if(image[i]<0)
  129: 	  switch(image[i])
  130: 	    {
  131: 	    case CF_NIL      : image[i]=0; break;
  132: #if !defined(DOUBLY_INDIRECT)
  133: 	    case CF(DOCOL)   :
  134: 	    case CF(DOVAR)   :
  135: 	    case CF(DOCON)   :
  136: 	    case CF(DOUSER)  : 
  137: 	    case CF(DODEFER) : 
  138: 	    case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
  139: 	    case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
  140: #endif /* !defined(DOUBLY_INDIRECT) */
  141: 	    case CF(DODOES)  :
  142: 	      MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
  143: 	      break;
  144: 	    default          :
  145: /*	      printf("Code field generation image[%x]:=CA(%x)\n",
  146: 		     i, CF(image[i])); */
  147: 	      image[i]=(Cell)CA(CF(image[i]));
  148: 	    }
  149: 	else
  150: 	  image[i]+=(Cell)image;
  151:       }
  152:     }
  153: }
  154: 
  155: UCell checksum(Label symbols[])
  156: {
  157:   UCell r=PRIM_VERSION;
  158:   Cell i;
  159: 
  160:   for (i=DOCOL; i<=DOESJUMP; i++) {
  161:     r ^= (UCell)(symbols[i]);
  162:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  163:   }
  164: #ifdef DIRECT_THREADED
  165:   /* we have to consider all the primitives */
  166:   for (; symbols[i]!=(Label)0; i++) {
  167:     r ^= (UCell)(symbols[i]);
  168:     r = (r << 5) | (r >> (8*sizeof(Cell)-5));
  169:   }
  170: #else
  171:   /* in indirect threaded code all primitives are accessed through the
  172:      symbols table, so we just have to put the base address of symbols
  173:      in the checksum */
  174:   r ^= (UCell)symbols;
  175: #endif
  176:   return r;
  177: }
  178: 
  179: Address my_alloc(Cell size)
  180: {
  181:   static Address next_address=0;
  182:   Address r;
  183: 
  184: /* the 256MB jump restriction on the MIPS architecture makes the
  185:    combination of direct threading and mmap unsafe. */
  186: #if HAVE_MMAP && (!defined(mips) || defined(INDIRECT_THREADED))
  187: #if defined(MAP_ANON)
  188:   if (debug)
  189:     fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_ANON, ...); ", (long)next_address, (long)size);
  190:   r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
  191: #else /* !defined(MAP_ANON) */
  192:   /* Ultrix (at least does not define MAP_FILE and MAP_PRIVATE (both are
  193:      apparently defaults*/
  194: #ifndef MAP_FILE
  195: # define MAP_FILE 0
  196: #endif
  197: #ifndef MAP_PRIVATE
  198: # define MAP_PRIVATE 0
  199: #endif
  200:   static int dev_zero=-1;
  201: 
  202:   if (dev_zero == -1)
  203:     dev_zero = open("/dev/zero", O_RDONLY);
  204:   if (dev_zero == -1) {
  205:     r = (Address)-1;
  206:     if (debug)
  207:       fprintf(stderr, "open(\"/dev/zero\"...) failed (%s), no mmap; ", 
  208: 	      strerror(errno));
  209:   } else {
  210:     if (debug)
  211:       fprintf(stderr,"try mmap($%lx, $%lx, ..., MAP_FILE, dev_zero, ...); ", (long)next_address, (long)size);
  212:     r=mmap(next_address, size, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_FILE|MAP_PRIVATE, dev_zero, 0);
  213:   }
  214: #endif /* !defined(MAP_ANON) */
  215: 
  216:   if (r != (Address)-1) {
  217:     if (debug)
  218:       fprintf(stderr, "success, address=$%lx\n", (long) r);
  219:     if (pagesize != 0)
  220:       next_address = (Address)(((((Cell)r)+size-1)&-pagesize)+2*pagesize); /* leave one page unmapped */
  221:     return r;
  222:   }
  223:   if (debug)
  224:     fprintf(stderr, "failed: %s\n", strerror(errno));
  225: #endif /* HAVE_MMAP */
  226:   /* use malloc as fallback, leave a little room (64B) for stack underflows */
  227:   if ((r = malloc(size+64))==NULL) {
  228:     perror(progname);
  229:     exit(1);
  230:   }
  231:   r = (Address)((((Cell)r)+(sizeof(Float)-1))&(-sizeof(Float)));
  232:   if (debug)
  233:     fprintf(stderr, "malloc succeeds, address=$%lx\n", (long)r);
  234:   return r;
  235: }
  236: 
  237: Address loader(FILE *imagefile, char* filename)
  238: /* returns the address of the image proper (after the preamble) */
  239: {
  240:   ImageHeader header;
  241:   Address image;
  242:   Address imp; /* image+preamble */
  243:   Char magic[9];
  244:   Cell preamblesize=0;
  245:   Label *symbols = engine(0,0,0,0,0);
  246:   Cell data_offset = offset_image ? 28*sizeof(Cell) : 0;
  247:   UCell check_sum;
  248:   static char* endianstring[]= { "big","little" };
  249: 
  250: #ifndef DOUBLY_INDIRECT
  251:   check_sum = checksum(symbols);
  252: #else /* defined(DOUBLY_INDIRECT) */
  253:   check_sum = (UCell)symbols;
  254: #endif /* defined(DOUBLY_INDIRECT) */
  255: 
  256:   do
  257:     {
  258:       if(fread(magic,sizeof(Char),8,imagefile) < 8) {
  259: 	fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.2) image.\n",
  260: 		progname, filename);
  261: 	exit(1);
  262:       }
  263:       preamblesize+=8;
  264:     }
  265:   while(memcmp(magic,"Gforth1",7));
  266:   if (debug) {
  267:     magic[8]='\0';
  268:     fprintf(stderr,"Magic found: %s\n", magic);
  269:   }
  270: 
  271:   if(magic[7] != sizeof(Cell) +
  272: #ifdef WORDS_BIGENDIAN
  273:        '0'
  274: #else
  275:        '1'
  276: #endif
  277:        )
  278:     { fprintf(stderr,"This image is %d bit %s-endian, whereas the machine is %d bit %s-endian.\n", 
  279: 	      ((magic[7]-'0')&~1)*8, endianstring[magic[7]&1],
  280: 	      sizeof(Cell)*8, endianstring[
  281: #ifdef WORDS_BIGENDIAN
  282: 		      0
  283: #else
  284: 		      1
  285: #endif
  286: 		      ]);
  287:       exit(-2);
  288:     };
  289: 
  290:   fread((void *)&header,sizeof(ImageHeader),1,imagefile);
  291:   if (dictsize==0)
  292:     dictsize = header.dict_size;
  293:   if (dsize==0)
  294:     dsize=header.data_stack_size;
  295:   if (rsize==0)
  296:     rsize=header.return_stack_size;
  297:   if (fsize==0)
  298:     fsize=header.fp_stack_size;
  299:   if (lsize==0)
  300:     lsize=header.locals_stack_size;
  301:   dictsize=maxaligned(dictsize);
  302:   dsize=maxaligned(dsize);
  303:   rsize=maxaligned(rsize);
  304:   lsize=maxaligned(lsize);
  305:   fsize=maxaligned(fsize);
  306:   
  307: #if HAVE_GETPAGESIZE
  308:   pagesize=getpagesize(); /* Linux/GNU libc offers this */
  309: #elif HAVE_SYSCONF && defined(_SC_PAGESIZE)
  310:   pagesize=sysconf(_SC_PAGESIZE); /* POSIX.4 */
  311: #elif PAGESIZE
  312:   pagesize=PAGESIZE; /* in limits.h according to Gallmeister's POSIX.4 book */
  313: #endif
  314:   if (debug)
  315:     fprintf(stderr,"pagesize=%d\n",pagesize);
  316: 
  317:   image = my_alloc(preamblesize+dictsize+data_offset)+data_offset;
  318:   rewind(imagefile);  /* fseek(imagefile,0L,SEEK_SET); */
  319:   if (clear_dictionary)
  320:     memset(image,0,dictsize);
  321:   fread(image,1,preamblesize+header.image_size,imagefile);
  322:   imp=image+preamblesize;
  323:   if(header.base==0) {
  324:     Cell reloc_size=((header.image_size-1)/sizeof(Cell))/8+1;
  325:     char reloc_bits[reloc_size];
  326:     fread(reloc_bits,1,reloc_size,imagefile);
  327:     relocate((Cell *)imp,reloc_bits,header.image_size,symbols);
  328: #if 0
  329:     { /* let's see what the relocator did */
  330:       FILE *snapshot=fopen("snapshot.fi","wb");
  331:       fwrite(image,1,imagesize,snapshot);
  332:       fclose(snapshot);
  333:     }
  334: #endif
  335:   }
  336:   else if(header.base!=imp) {
  337:     fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\n",
  338: 	    progname, (unsigned long)header.base, (unsigned long)imp);
  339:     exit(1);
  340:   }
  341:   if (header.checksum==0)
  342:     ((ImageHeader *)imp)->checksum=check_sum;
  343:   else if (header.checksum != check_sum) {
  344:     fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\n",
  345: 	    progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
  346:     exit(1);
  347:   }
  348:   fclose(imagefile);
  349: 
  350:   ((ImageHeader *)imp)->dict_size=dictsize;
  351:   ((ImageHeader *)imp)->data_stack_size=dsize;
  352:   ((ImageHeader *)imp)->fp_stack_size=fsize;
  353:   ((ImageHeader *)imp)->return_stack_size=rsize;
  354:   ((ImageHeader *)imp)->locals_stack_size=lsize;
  355: 
  356:   ((ImageHeader *)imp)->data_stack_base=my_alloc(dsize);
  357:   ((ImageHeader *)imp)->fp_stack_base=my_alloc(fsize);
  358:   ((ImageHeader *)imp)->return_stack_base=my_alloc(rsize);
  359:   ((ImageHeader *)imp)->locals_stack_base=my_alloc(lsize);
  360: 
  361:   CACHE_FLUSH(imp, header.image_size);
  362: 
  363:   return imp;
  364: }
  365: 
  366: int go_forth(Address image, int stack, Cell *entries)
  367: {
  368:   Cell *sp=(Cell*)(((ImageHeader *)image)->data_stack_base + dsize);
  369:   Float *fp=(Float *)(((ImageHeader *)image)->fp_stack_base + fsize);
  370:   Cell *rp=(Cell *)(((ImageHeader *)image)->return_stack_base + rsize);
  371:   Address lp=((ImageHeader *)image)->locals_stack_base + lsize;
  372:   Xt *ip=(Xt *)(((ImageHeader *)image)->boot_entry);
  373:   int throw_code;
  374: 
  375:   /* ensure that the cached elements (if any) are accessible */
  376:   IF_TOS(sp--);
  377:   IF_FTOS(fp--);
  378:   
  379:   for(;stack>0;stack--)
  380:     *--sp=entries[stack-1];
  381: 
  382: #if !defined(MSDOS) && !defined(_WIN32) && !defined(__EMX__)
  383:   get_winsize();
  384: #endif
  385:    
  386:   install_signal_handlers(); /* right place? */
  387:   
  388:   if ((throw_code=setjmp(throw_jmp_buf))) {
  389:     static Cell signal_data_stack[8];
  390:     static Cell signal_return_stack[8];
  391:     static Float signal_fp_stack[1];
  392:     
  393:     signal_data_stack[7]=throw_code;
  394:     
  395:     return((int)engine(((ImageHeader *)image)->throw_entry,signal_data_stack+7,
  396: 		       signal_return_stack+8,signal_fp_stack,0));
  397:   }
  398: 
  399:   return((int)engine(ip,sp,rp,fp,lp));
  400: }
  401: 
  402: UCell convsize(char *s, UCell elemsize)
  403: /* converts s of the format [0-9]+[bekM]? (e.g. 25k) into the number
  404:    of bytes.  the letter at the end indicates the unit, where e stands
  405:    for the element size. default is e */
  406: {
  407:   char *endp;
  408:   UCell n,m;
  409: 
  410:   m = elemsize;
  411:   n = strtoul(s,&endp,0);
  412:   if (endp!=NULL) {
  413:     if (strcmp(endp,"b")==0)
  414:       m=1;
  415:     else if (strcmp(endp,"k")==0)
  416:       m=1024;
  417:     else if (strcmp(endp,"M")==0)
  418:       m=1024*1024;
  419:     else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
  420:       fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
  421:       exit(1);
  422:     }
  423:   }
  424:   return n*m;
  425: }
  426: 
  427: int main(int argc, char **argv, char **env)
  428: {
  429:   char *path, *path1;
  430:   char *imagename="gforth.fi";
  431:   FILE *image_file;
  432:   int c, retvalue;
  433: 	  
  434: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
  435:   /* turn on alignment checks on the 486.
  436:    * on the 386 this should have no effect. */
  437:   __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
  438:   /* this is unusable with Linux' libc.4.6.27, because this library is
  439:      not alignment-clean; we would have to replace some library
  440:      functions (e.g., memcpy) to make it work */
  441: #endif
  442: 
  443:   progname = argv[0];
  444:   if ((path1=getenv("GFORTHPATH"))==NULL)
  445:     path1 = DEFAULTPATH;
  446:   
  447:   opterr=0;
  448:   while (1) {
  449:     int option_index=0;
  450:     static struct option opts[] = {
  451:       {"image-file", required_argument, NULL, 'i'},
  452:       {"dictionary-size", required_argument, NULL, 'm'},
  453:       {"data-stack-size", required_argument, NULL, 'd'},
  454:       {"return-stack-size", required_argument, NULL, 'r'},
  455:       {"fp-stack-size", required_argument, NULL, 'f'},
  456:       {"locals-stack-size", required_argument, NULL, 'l'},
  457:       {"path", required_argument, NULL, 'p'},
  458:       {"version", no_argument, NULL, 'v'},
  459:       {"help", no_argument, NULL, 'h'},
  460:       /* put something != 0 into offset_image */
  461:       {"offset-image", no_argument, &offset_image, 1},
  462:       {"no-offset-im", no_argument, &offset_image, 0},
  463:       {"clear-dictionary", no_argument, &clear_dictionary, 1},
  464:       {"debug", no_argument, &debug, 1},
  465:       {0,0,0,0}
  466:       /* no-init-file, no-rc? */
  467:     };
  468:     
  469:     c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:vh", opts, &option_index);
  470:     
  471:     if (c==EOF)
  472:       break;
  473:     if (c=='?') {
  474:       optind--;
  475:       break;
  476:     }
  477:     switch (c) {
  478:     case 'i': imagename = optarg; break;
  479:     case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
  480:     case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
  481:     case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
  482:     case 'f': fsize = convsize(optarg,sizeof(Float)); break;
  483:     case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
  484:     case 'p': path1 = optarg; break;
  485:     case 'v': fprintf(stderr, "gforth %s\n", gforth_version); exit(0);
  486:     case 'h': 
  487:       fprintf(stderr, "Usage: %s [engine options] [image arguments]\n\
  488: Engine Options:\n\
  489:  -c, --clear-dictionary		    Initialize the dictionary with 0 bytes\n\
  490:  -d SIZE, --data-stack-size=SIZE    Specify data stack size\n\
  491:  --debug			    Print debugging information during startup\n\
  492:  -f SIZE, --fp-stack-size=SIZE	    Specify floating point stack size\n\
  493:  -h, --help			    Print this message and exit\n\
  494:  -i FILE, --image-file=FILE	    Use image FILE instead of `gforth.fi'\n\
  495:  -l SIZE, --locals-stack-size=SIZE  Specify locals stack size\n\
  496:  -m SIZE, --dictionary-size=SIZE    Specify Forth dictionary size\n\
  497:  --offset-image			    Load image at a different position\n\
  498:  -p PATH, --path=PATH		    Search path for finding image and sources\n\
  499:  -r SIZE, --return-stack-size=SIZE  Specify return stack size\n\
  500:  -v, --version			    Print version and exit\n\
  501: SIZE arguments consist of an integer followed by a unit. The unit can be\n\
  502:   `b' (bytes), `e' (elements), `k' (kilobytes), or `M' (Megabytes).\n\
  503: \n\
  504: Arguments of default image `gforth.fi':\n\
  505:  FILE				    load FILE (with `require')\n\
  506:  -e STRING, --evaluate STRING       interpret STRING (with `EVALUATE')\n",
  507: 	      argv[0]); exit(0);
  508:     }
  509:   }
  510:   path=path1;
  511:   
  512:   if(strchr(imagename, '/')==NULL)
  513:     {
  514:       do {
  515: 	char *pend=strchr(path, PATHSEP);
  516: 	if (pend==NULL)
  517: 	  pend=path+strlen(path);
  518: 	if (strlen(path)==0) {
  519: 	  fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
  520: 		  progname, imagename, path1);
  521: 	  exit(1);
  522: 	}
  523: 	{
  524: 	  int dirlen=pend-path;
  525: 	  char fullfilename[dirlen+strlen(imagename)+2];
  526: 	  memcpy(fullfilename, path, dirlen);
  527: 	  if (fullfilename[dirlen-1]!='/')
  528: 	    fullfilename[dirlen++]='/';
  529: 	  strcpy(fullfilename+dirlen,imagename);
  530: 	  image_file=fopen(fullfilename,"rb");
  531: 	  if (image_file!=NULL && debug)
  532: 	    fprintf(stderr, "Opened image file: %s\n", fullfilename);
  533: 	}
  534: 	path=pend+(*pend==PATHSEP);
  535:       } while (image_file==NULL);
  536:     }
  537:   else
  538:     {
  539:       image_file=fopen(imagename,"rb");
  540:     }
  541: 
  542:   {
  543:     char path2[strlen(path1)+1];
  544:     char *p1, *p2;
  545:     Cell environ[]= {
  546:       (Cell)argc-(optind-1),
  547:       (Cell)(argv+(optind-1)),
  548:       (Cell)strlen(path1),
  549:       (Cell)path2};
  550:     argv[optind-1] = progname;
  551:     /*
  552:        for (i=0; i<environ[0]; i++)
  553:        printf("%s\n", ((char **)(environ[1]))[i]);
  554:        */
  555:     /* make path OS-independent by replacing path separators with NUL */
  556:     for (p1=path1, p2=path2; *p1!='\0'; p1++, p2++)
  557:       if (*p1==PATHSEP)
  558: 	*p2 = '\0';
  559:       else
  560: 	*p2 = *p1;
  561:     *p2='\0';
  562:     retvalue=go_forth(loader(image_file, imagename),4,environ);
  563:     deprep_terminal();
  564:     exit(retvalue);
  565:   }
  566: }

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