fix bugs in new stretchy buffer code, add stretchy buffer tests

deprecated/stretchy_buffer.txt

+// stretchy buffer // init: NULL // free: sbfree() // push_back: sbpush() // size: sbcount() //
+#define sbfree(a)         ((a) ? free(stb__sbraw(a)),0 : 0)
+#define sbpush(a,v)       (stb__sbmaybegrow(a,1), (a)[stb__sbn(a)++] = (v))
+#define sbcount(a)        ((a) ? stb__sbn(a) : 0)
+#define sbadd(a,n)        (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
+#define sblast(a)         ((a)[stb__sbn(a)-1])
+
+#include <stdlib.h>
+#define stb__sbraw(a) ((int *) (a) - 2)
+#define stb__sbm(a)   stb__sbraw(a)[0]
+#define stb__sbn(a)   stb__sbraw(a)[1]
+
+#define stb__sbneedgrow(a,n)  ((a)==0 || stb__sbn(a)+n >= stb__sbm(a))
+#define stb__sbmaybegrow(a,n) (stb__sbneedgrow(a,(n)) ? stb__sbgrow(a,n) : 0)
+#define stb__sbgrow(a,n)  stb__sbgrowf((void **) &(a), (n), sizeof(*(a)))
+
+static void stb__sbgrowf(void **arr, int increment, int itemsize)
+{
+   int m = *arr ? 2*stb__sbm(*arr)+increment : increment+1;
+   void *p = realloc(*arr ? stb__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
+   assert(p);
+   if (p) {
+      if (!*arr) ((int *) p)[1] = 0;
+      *arr = (void *) ((int *) p + 2);
+      stb__sbm(*arr) = m;
+   }
+}
+

stretchy_buffer.h

@@ -137,7 +137,7 @@ static void * stb__sbgrowf(void *arr, int increment, int itemsize)
       if (!arr)
          p[1] = 0;
       p[0] = m;
-      return p;
+      return p+2;
    } else {
       #ifdef STRETCHY_BUFFER_OUT_OF_MEMORY
       STRETCHY_BUFFER_OUT_OF_MEMORY ;

tests/image_test.dsp

@@ -61,7 +61,7 @@ LINK32=link.exe
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "Debug"
-# PROP Intermediate_Dir "Debug"
+# PROP Intermediate_Dir "Debug\image_test"
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
 # ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I ".." /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c

tests/stb.dsp

@@ -62,7 +62,7 @@ LINK32=link.exe
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "Debug"
-# PROP Intermediate_Dir "Debug"
+# PROP Intermediate_Dir "Debug\stb"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
@@ -98,11 +98,11 @@ SOURCE=..\stb_vorbis.c
 # End Source File
 # Begin Source File
 
-SOURCE=.\test_c_compilation.c
+SOURCE=.\stretchy_buffer_test.c
 # End Source File
 # Begin Source File
 
-SOURCE=.\stretchy_buffer_test.c
+SOURCE=.\test_c_compilation.c
 # End Source File
 # Begin Source File
 

tests/stb.dsw

@@ -41,6 +41,9 @@ Package=<4>
     Begin Project Dependency
     Project_Dep_Name image_test
     End Project Dependency
+    Begin Project Dependency
+    Project_Dep_Name stretch_test
+    End Project Dependency
 }}}
 
 ###############################################################################
@@ -57,6 +60,18 @@ Package=<4>
 
 ###############################################################################
 
+Project: "stretch_test"=.\stretch_test.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
 Global:
 
 Package=<5>

tests/stb_cpp.dsp

@@ -61,7 +61,7 @@ LINK32=link.exe
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "Debug"
-# PROP Intermediate_Dir "Debug"
+# PROP Intermediate_Dir "Debug\stb_cpp"
 # PROP Ignore_Export_Lib 0
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c

tests/stretch_test.c

+#include "stretchy_buffer.h"
+#include <assert.h>
+
+int main(int arg, char **argv)
+{
+   int i;
+   int *arr = NULL;
+
+   for (i=0; i < 1000000; ++i)
+      sb_push(arr, i);
+
+   assert(sb_count(arr) == 1000000);
+   for (i=0; i < 1000000; ++i)
+      assert(arr[i] == i);
+
+   sb_free(arr);
+   arr = NULL;
+
+   for (i=0; i < 1000; ++i)
+      sb_add(arr, 1000);
+   assert(sb_count(arr) == 1000000);
+
+   return 0;
+}
\ No newline at end of file

tests/stretch_test.dsp

+# Microsoft Developer Studio Project File - Name="stretch_test" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Console Application" 0x0103
+
+CFG=stretch_test - Win32 Debug
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "stretch_test.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "stretch_test.mak" CFG="stretch_test - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "stretch_test - Win32 Release" (based on "Win32 (x86) Console Application")
+!MESSAGE "stretch_test - Win32 Debug" (based on "Win32 (x86) Console Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "stretch_test - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib  kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib  kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
+
+!ELSEIF  "$(CFG)" == "stretch_test - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "stretch_test___Win32_Debug"
+# PROP BASE Intermediate_Dir "stretch_test___Win32_Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug\stretch_test"
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ  /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I ".." /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ  /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib  kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib  kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+
+!ENDIF 
+
+# Begin Target
+
+# Name "stretch_test - Win32 Release"
+# Name "stretch_test - Win32 Debug"
+# Begin Source File
+
+SOURCE=.\stretch_test.c
+# End Source File
+# End Target
+# End Project

tools/make_readme.dsp

@@ -61,7 +61,7 @@ LINK32=link.exe
 # PROP Use_MFC 0
 # PROP Use_Debug_Libraries 1
 # PROP Output_Dir "Debug"
-# PROP Intermediate_Dir "Debug"
+# PROP Intermediate_Dir "Debug\make_readme"
 # PROP Target_Dir ""
 # ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
 # ADD CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c