--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/unexnext.c	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,303 @@
+/* Dump Emacs in macho format.
+   Copyright (C) 1990-1993 Free Software Foundation, Inc.
+   Written by Bradley Taylor (btaylor@next.com).
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with:  NeXT port */
+
+#include <stdio.h>
+#include <libc.h>
+#include <nlist.h>
+#include <mach/mach.h>
+#include <mach-o/ldsyms.h>
+#include <mach-o/loader.h>
+
+int malloc_cookie;
+
+static void fatal_unexec(char *format, ...)
+   {
+   va_list ap;
+   
+   va_start(ap, format);
+   fprintf(stderr, "unexec: ");
+   vfprintf(stderr, format, ap);
+   fprintf(stderr, "\n");
+   va_end(ap);
+   exit(1);
+   }
+
+static void mcopy(int ffd,int tfd,
+                  unsigned long fpos,unsigned long tpos,unsigned long len)
+   {
+   if ((ffd==-1)&&(tfd==-1))
+      {
+      char *f,*t,*e;
+      if (fpos>tpos)
+         {
+         f=(char *)fpos;
+         t=(char *)tpos;
+         e=(char *)(fpos+len);
+         while(f<e) *t++=*f++;
+         }
+      else if (tpos>fpos)
+         {
+         f=(char *)(fpos+len);
+         t=(char *)(tpos+len);
+         e=(char *)fpos;
+         while(f>e) *--t=*--f;         
+         }   
+      }
+   else if (ffd==-1)
+      {
+      if (lseek(tfd,tpos,L_SET)<0)
+         fatal_unexec("cannot seek target");
+      if (write(tfd,(void *)fpos,len)!=len)
+         fatal_unexec("cannot write target");
+      }
+   else if (tfd==-1)
+      {
+      if (lseek(ffd,fpos,L_SET)<0)
+         fatal_unexec("cannot seek source");
+      if (read(ffd,(void *)tpos,len)!=len)
+         fatal_unexec("cannot read source");
+      }
+   else
+      {
+      int bread;
+      char *buf=alloca(1<<16);
+      
+      if (lseek(ffd,fpos,L_SET)<0)
+         fatal_unexec("cannot seek source");
+      
+      if (lseek(tfd,tpos,L_SET)<0)
+         fatal_unexec("cannot seek target");
+      
+      while((len>0) && (bread=read(ffd,buf,MIN(1<<16,len)))>0)
+         {
+         if (bread<0)
+            fatal_unexec("cannot read source");
+         if (write(tfd,buf,bread)!=bread)
+            fatal_unexec("cannot write target");
+         len-=bread;
+         }
+      }
+   }
+
+static void unexec_doit(int infd,int outfd)
+   {
+   int i,j,hpos,opos;
+   extern int malloc_freezedry(void);
+   struct region
+      {
+      struct region *next;
+      unsigned long addr;
+      unsigned long size;
+      vm_prot_t prot;
+      vm_prot_t mprot;
+      } *regions=0,*cregion,**pregions;
+   struct mach_header mh;
+   struct segment_command *lc,*sp;
+   struct symtab_command *st;
+   struct section *sect;
+
+   malloc_cookie=malloc_freezedry();
+   
+      {
+      vm_task_t task=task_self();
+      vm_address_t addr;
+      vm_size_t size;
+      vm_prot_t prot,mprot;
+      vm_inherit_t inhe;
+      boolean_t shrd;
+      port_t name;
+      vm_offset_t offset;
+      
+      for(addr=VM_MIN_ADDRESS,pregions=&regions;
+          vm_region(task,&addr,&size,&prot,&mprot,
+                    &inhe,&shrd,&name,&offset)==KERN_SUCCESS;
+          addr += size)
+         {
+         (*pregions)=alloca(sizeof(struct region));
+         (*pregions)->addr=addr;
+         (*pregions)->size=size;
+         (*pregions)->prot=prot;
+         (*pregions)->mprot=mprot;
+         (*pregions)->next=0;
+         pregions=&((*pregions)->next);
+         }
+      }
+   
+   for(cregion=regions;cregion;cregion=cregion->next)
+      while ((cregion->next) &&
+             (cregion->next->addr==cregion->addr+cregion->size) &&
+             (cregion->next->prot==cregion->prot) &&
+             (cregion->next->mprot==cregion->mprot))
+         {
+         cregion->size += cregion->next->size;
+         cregion->next = cregion->next->next;
+         }
+
+   mcopy(infd,-1,0,(unsigned long) &mh,sizeof(mh));
+   lc=alloca(mh.sizeofcmds);
+   mcopy(infd,-1,sizeof(mh),(unsigned long) lc,mh.sizeofcmds);
+   
+   for(pregions=&regions;*pregions;)
+      {
+      if (!((*pregions)->prot&VM_PROT_WRITE)
+          || ((*pregions)->addr>=0x3000000))
+         goto kill_region;
+      
+      for(sp=lc,i=0;
+          i<mh.ncmds;
+          i++,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
+         {
+         unsigned long ob,oe;
+         if (sp->cmd!=LC_SEGMENT||(strcmp(sp->segname,SEG_DATA)==0)) continue;
+         ob=MAX((*pregions)->addr,sp->vmaddr);
+         oe=MIN((*pregions)->addr+(*pregions)->size,sp->vmaddr+sp->vmsize);
+         if (ob >= oe) continue;
+         if (ob==(*pregions)->addr)
+            if (oe==(*pregions)->addr+(*pregions)->size)
+               {
+               goto kill_region;
+               }
+            else
+               {
+               (*pregions)->addr=oe;
+               (*pregions)->size-=(oe-ob);
+               }
+         else
+            if (oe==(*pregions)->addr+(*pregions)->size)
+               {
+               (*pregions)->size-=(oe-ob);
+               }
+            else
+               {
+               cregion=alloca(sizeof(*cregion));
+               cregion->addr=oe;
+               cregion->size=((*pregions)->addr+(*pregions)->size)-oe;
+               cregion->prot=(*pregions)->prot;
+               cregion->mprot=(*pregions)->mprot;
+               cregion->next=(*pregions)->next;
+               (*pregions)->size=ob-(*pregions)->addr;
+               (*pregions)->next=cregion;
+               }
+         }
+      pregions=&((*pregions)->next);
+      continue;
+    kill_region:
+      *pregions=(*pregions)->next;
+      }
+
+   for(sp=lc,i=mh.ncmds,hpos=sizeof(mh),opos=0;
+       i>0;
+       i--,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
+      switch (sp->cmd)
+         {
+       case LC_SEGMENT:
+         if (strcmp(sp->segname,SEG_DATA)==0)
+            {
+            mh.ncmds--;
+            j=sp->cmdsize;
+            while (regions)
+               {
+               mcopy(-1,outfd,regions->addr,opos,regions->size);
+               sp->cmd=LC_SEGMENT;
+               sp->cmdsize=sizeof(*sp);
+               strncpy(sp->segname,SEG_DATA,sizeof(sp->segname));
+               sp->vmaddr=regions->addr;
+               sp->vmsize=regions->size;
+               sp->filesize=regions->size;
+               sp->maxprot=regions->prot;
+               sp->initprot=regions->mprot;
+               sp->nsects=0;
+               sp->flags=0;
+               sp->fileoff=opos;
+               opos+=sp->filesize;
+               mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
+               hpos+=sp->cmdsize;
+               mh.ncmds++;
+               regions=regions->next;
+               }
+            sp->cmdsize=j;
+            regions=0;
+            }
+         else if (strcmp(sp->segname,SEG_LINKEDIT)==0)
+            {
+            mh.ncmds--;
+            }
+         else
+            {
+            mcopy(infd,outfd,sp->fileoff,opos,sp->filesize);
+            sect=(struct section *) (((char *)sp)+sizeof(*sp));
+            for(j=0;j<sp->nsects;j++)
+               {
+               if (sect[j].offset!=0)
+                  sect[j].offset=(sect[j].offset-sp->fileoff)+opos;
+               if (sect[j].reloff!=0)
+                  sect[j].reloff=(sect[j].reloff-sp->fileoff)+opos;
+               }
+            sp->fileoff=opos;
+            opos+=sp->filesize;
+            mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
+            hpos+=sp->cmdsize;
+            }
+	 break;
+       case LC_SYMTAB:
+         st=(struct symtab_command *)sp;
+         
+         mcopy(infd,outfd,st->symoff,opos,st->nsyms*sizeof(struct nlist));
+         st->symoff=opos;
+         opos+=sizeof(struct nlist)*st->nsyms;
+         
+         mcopy(infd,outfd,st->stroff,opos,st->strsize);
+         ((struct symtab_command *)sp)->stroff=opos;
+         opos+=((struct symtab_command *)sp)->strsize;
+       default:
+         mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
+         hpos+=sp->cmdsize;
+         }
+   mh.sizeofcmds=hpos-sizeof(mh);
+   mcopy(-1,outfd,(unsigned long) &mh,0,sizeof(mh));
+   }
+
+void unexec(char *outfile,char *infile)
+   {
+   char tmpfile[MAXPATHLEN];
+   int infd,outfd;
+   
+   if ((infd=open(infile, O_RDONLY, 0))<0)
+      fatal_unexec("cannot open input file `%s'", infile);
+
+   strcpy(tmpfile,outfile);
+   strcat(tmpfile,"-temp");
+   
+   if ((outfd=open(tmpfile, O_RDWR|O_TRUNC|O_CREAT, 0755))<0)
+      fatal_unexec("cannot open temporary output file `%s'",tmpfile);
+
+   unexec_doit(infd,outfd);
+
+   close(infd);
+   close(outfd);
+   if (rename(tmpfile, outfile)<0)
+      {
+      unlink(tmpfile);
+      fatal_unexec("cannot rename `%s' to `%s'", tmpfile, outfile);
+      }  
+   }