From 5e960e1fd332b5aaa1e99c3e0bc8e30fe19999b1 Mon Sep 17 00:00:00 2001
From: kichik <kichik@212acab6-be3b-0410-9dea-997c60f758d6>
Date: Sat, 25 Sep 2004 13:35:03 +0000
Subject: [PATCH] relative jumps now work with instructions that add multiple
 entries (including plug-in calls)

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3670 212acab6-be3b-0410-9dea-997c60f758d6
---
 Docs/src/jumps.but |  2 --
 Source/build.cpp   | 28 +++++++++++++++++++++++++++-
 Source/build.h     |  2 ++
 Source/script.cpp  |  2 ++
 4 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/Docs/src/jumps.but b/Docs/src/jumps.but
index 2e3dcd36..e69cda82 100644
--- a/Docs/src/jumps.but
+++ b/Docs/src/jumps.but
@@ -16,5 +16,3 @@ Examples:
 \c  MessageBox MB_OK "You will never ever see this message box"
 \c  Goto -3
 \c  MessageBox MB_OK "Done"
-
-\\<b\\>Note:\\</b\\> relative jumps don't work with \R{Exch}{Exch}, \R{file}{File}, \R{plugindlls}{plug-ins (Plugin::Function)}, \R{initpluginsdir}{InitPluginsDir}, \R{getfiletimelocal}{GetFileTimeLocal} or \R{getdllversionlocal}{GetDLLVersionLocal}. Do \e{not} try to jump over them using relative jumps, you will not get the result you were expecting.
\ No newline at end of file
diff --git a/Source/build.cpp b/Source/build.cpp
index 418e5c0e..63aae1ed 100644
--- a/Source/build.cpp
+++ b/Source/build.cpp
@@ -76,6 +76,7 @@ CEXEBuild::CEXEBuild()
   cur_ifblock=NULL;
   last_line_had_slash=0;
   inside_comment=false;
+  multiple_entries_instruction=0;
 
   build_include_depth=0;
 
@@ -275,6 +276,7 @@ definedlist.add("NSIS_SUPPORT_LANG_IN_STRINGS");
   build_compress_dict_size=1<<23;
 
   cur_entries=&build_entries;
+  cur_instruction_entry_map=&build_instruction_entry_map;
   cur_datablock=&build_datablock;
   cur_datablock_cache=&build_datablock_cache;
   cur_functions=&build_functions;
@@ -1278,9 +1280,12 @@ int CEXEBuild::add_entry(const entry *ent)
   }
 
   cur_entries->add(ent,sizeof(entry));
+  cur_instruction_entry_map->add(&multiple_entries_instruction,sizeof(int));
   build_cursection->code_size++;
   cur_header->blocks[NB_ENTRIES].num++;
 
+  multiple_entries_instruction=1;
+
   return PS_OK;
 }
 
@@ -1304,7 +1309,26 @@ int CEXEBuild::resolve_jump_int(const char *fn, int *a, int offs, int start, int
     char *lname=(char*)ns_label.get()+*a;
     if (lname[0] == '-' || lname[0]=='+')
     {
-      *a=offs+atoi(lname)+1;
+      int jump = atoi(lname);
+      int *skip_map = (int *) cur_instruction_entry_map->get();
+
+      int direction = 1;
+      if (jump < 0)
+        direction = -1;
+
+      for (; jump != 0; jump -= direction)
+      {
+        offs += direction;
+        if (offs >= 0 && offs < cur_instruction_entry_map->getlen() * sizeof(int))
+        {
+          while (skip_map[offs])
+          {
+            offs += direction;
+          }
+        }
+      }
+
+      *a = offs + 1;
     }
     else
     {
@@ -3014,6 +3038,7 @@ void CEXEBuild::set_uninstall_mode(int un)
       cur_datablock=&ubuild_datablock;
       cur_datablock_cache=&ubuild_datablock_cache;
       cur_entries=&ubuild_entries;
+      cur_instruction_entry_map=&ubuild_instruction_entry_map;
       cur_functions=&ubuild_functions;
       cur_labels=&ubuild_labels;
       cur_pages=&ubuild_pages;
@@ -3028,6 +3053,7 @@ void CEXEBuild::set_uninstall_mode(int un)
       cur_datablock=&build_datablock;
       cur_datablock_cache=&build_datablock_cache;
       cur_entries=&build_entries;
+      cur_instruction_entry_map=&build_instruction_entry_map;
       cur_functions=&build_functions;
       cur_labels=&build_labels;
       cur_pages=&build_pages;
diff --git a/Source/build.h b/Source/build.h
index e94b320e..de6debc1 100644
--- a/Source/build.h
+++ b/Source/build.h
@@ -158,6 +158,7 @@ class CEXEBuild {
 
     int last_line_had_slash;
     bool inside_comment;
+    int multiple_entries_instruction;
 
     void ERROR_MSG(const char *s, ...);
     void SCRIPT_MSG(const char *s, ...);
@@ -321,6 +322,7 @@ class CEXEBuild {
     section *build_cursection;
     TinyGrowBuf build_sections, ubuild_sections, *cur_sections;
     GrowBuf build_entries,ubuild_entries, *cur_entries;
+    GrowBuf build_instruction_entry_map,ubuild_instruction_entry_map, *cur_instruction_entry_map;
     TinyGrowBuf build_functions, ubuild_functions, *cur_functions;
     TinyGrowBuf build_labels, ubuild_labels, *cur_labels;
     StringList build_strlist, ubuild_strlist, *cur_strlist;
diff --git a/Source/script.cpp b/Source/script.cpp
index ad92190a..fd4f3b78 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -804,6 +804,8 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
   build_plugin_table();
 #endif
 
+  multiple_entries_instruction=0;
+
   entry ent={0,};
   switch (which_token)
   {