win32: enable globbing by default

Change how busybox.exe expands wildcards on the command line.

When globbing is enabled at compile time provide an implementation
of _setargv(), which is run early during startup of C programs.  This:

- enables globbing by setting _dowildcard to -1
- checks for the presence of the environment BB_GLOBBING
- if it exists and is set to 0 disables globbing
- if it doesn't exist sets BB_GLOBBING=0 but continues to apply
  Windows' globbing in the current process

The consequences of this are:

- When busybox.exe is initially run from a Command Prompt Windows'
  globbing is applied;
- Windows' globbing is turned off for future child processes, thus
  allowing the shell re-execute busybox.exe without it interfering
  with wildcards;
- this behaviour can be overridden by setting BB_GLOBBING explicitly.

Globbing can still be disabled at compile time if required.  In that
case BB_GLOBBING has no effect.

With these changes globbing can be enabled by default and BusyBox
will do the right thing in most circumstances.

(See GitHub issues #172 and #189.)

2 files changed, 4 insertions, 4 deletions

diff --git a/configs/mingw32_defconfig b/configs/mingw32_defconfig
index bffe88842..b3dfc0033 100644
--- a/configs/mingw32_defconfig
+++ b/configs/mingw32_defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Busybox version: 1.32.0.git
-# Fri May 29 10:58:25 2020
+# Sun Jun 14 09:30:06 2020
 #
 CONFIG_HAVE_DOT_CONFIG=y
 # CONFIG_PLATFORM_POSIX is not set
@@ -43,7 +43,7 @@ CONFIG_BUSYBOX_EXEC_PATH=""
 #
 # Settings for MINGW32
 #
-# CONFIG_GLOBBING is not set
+CONFIG_GLOBBING=y
 CONFIG_FEATURE_PRNG_SHELL=y
 # CONFIG_FEATURE_PRNG_ISAAC is not set
 CONFIG_FEATURE_RESOURCES=y
diff --git a/configs/mingw64_defconfig b/configs/mingw64_defconfig
index d0a541162..2410d476d 100644
--- a/configs/mingw64_defconfig
+++ b/configs/mingw64_defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Busybox version: 1.32.0.git
-# Fri May 29 10:59:57 2020
+# Sun Jun 14 09:30:06 2020
 #
 CONFIG_HAVE_DOT_CONFIG=y
 # CONFIG_PLATFORM_POSIX is not set
@@ -43,7 +43,7 @@ CONFIG_BUSYBOX_EXEC_PATH=""
 #
 # Settings for MINGW32
 #
-# CONFIG_GLOBBING is not set
+CONFIG_GLOBBING=y
 CONFIG_FEATURE_PRNG_SHELL=y
 # CONFIG_FEATURE_PRNG_ISAAC is not set
 CONFIG_FEATURE_RESOURCES=y