[Patch, Fortran] PR 51899 - Fix building libgfortran's chmod.c with MinGW

[Tobias Burnus <burnus at net-b dot de>]

This patch fixes three issues with building libgfortran for MinGW/MinGW64:

a) mode_t is unsigned short while scanf's %o expects an unsigned int 
variable.
b) umask is not available
c) Only read and write is available but not group/other 
read/write/execute, SUID/SGID or the sticky bit.

Thanks to Kai for some advice - he also stated that the patch looks okay.

Bootstrapped on x86-64-linux, but not (yet) tested on MinGW/MinGW64
OK for the trunk?

Tobias
2012-01-19  Tobias Burnus  <burnus@net-b.de>

	PR libgfortran/51899
	* configure.ac: Check whether umask is available.
	* intrinsics/chmod.c (chmod_func): Make compile with MinGW.
	* configure: Regenerate.
	* config.h.in: Regenerate.

diff --git a/libgfortran/config.h.in b/libgfortran/config.h.in
index 3bba6e6..3739309 100644
--- a/libgfortran/config.h.in
+++ b/libgfortran/config.h.in
@@ -783,6 +783,9 @@
 /* Define to 1 if the system has the type `uintptr_t'. */
 #undef HAVE_UINTPTR_T
 
+/* Define to 1 if you have the `umask' function. */
+#undef HAVE_UMASK
+
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
diff --git a/libgfortran/configure b/libgfortran/configure
index 3cf9ac8..0498238 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -2591,6 +2591,7 @@ as_fn_append ac_func_list " getpid"
 as_fn_append ac_func_list " getppid"
 as_fn_append ac_func_list " getuid"
 as_fn_append ac_func_list " geteuid"
+as_fn_append ac_func_list " umask"
 # Check that the precious variables saved in the cache have kept the same
 # value.
 ac_cache_corrupted=false
@@ -12317,7 +12318,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12320 "configure"
+#line 12321 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12423,7 +12424,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12426 "configure"
+#line 12427 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16532,6 +16533,8 @@ done
 
 
 
+
+
 # Check for C99 (and other IEEE) math functions
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for acosf in -lm" >&5
 $as_echo_n "checking for acosf in -lm... " >&6; }
diff --git a/libgfortran/configure.ac b/libgfortran/configure.ac
index e8bbda5..af987bd 100644
--- a/libgfortran/configure.ac
+++ b/libgfortran/configure.ac
@@ -266,7 +266,7 @@ ftruncate chsize chdir getlogin gethostname kill link symlink sleep ttyname \
 alarm access fork execl wait setmode execve pipe dup2 close \
 strcasestr getrlimit gettimeofday stat fstat lstat getpwuid vsnprintf dup \
 getcwd localtime_r gmtime_r strerror_r getpwuid_r ttyname_r clock_gettime \
-readlink getgid getpid getppid getuid geteuid)
+readlink getgid getpid getppid getuid geteuid umask)
 
 # Check for C99 (and other IEEE) math functions
 AC_CHECK_LIB([m],[acosf],[AC_DEFINE([HAVE_ACOSF],[1],[libm includes acosf])])
diff --git a/libgfortran/intrinsics/chmod.c b/libgfortran/intrinsics/chmod.c
index 6c685f4..01db8be 100644
--- a/libgfortran/intrinsics/chmod.c
+++ b/libgfortran/intrinsics/chmod.c
@@ -37,6 +37,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
    Sets the file permission "chmod" using a mode string.
 
+   For MinGW, only _S_IWRITE and _S_IREAD are supported. To set those,
+   only the user attributes are used.
+
    The mode string allows for the same arguments as POSIX's chmod utility.
    a) string containing an octal number.
    b) Comma separated list of clauses of the form:
@@ -89,8 +92,15 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 
   if (mode[0] >= '0' && mode[0] <= '9')
     {
+#ifdef __MINGW32__
+      unsigned mode;
+      if (sscanf (mode, "%o", &mode) != 1)
+	return 1;
+      file_mode = (mode_t) mode;
+#else
       if (sscanf (mode, "%o", &file_mode) != 1)
 	return 1;
+#endif
       return chmod (file, file_mode);
     }
 
@@ -101,10 +111,14 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
   file_mode = stat_buf.st_mode & ~S_IFMT;
   is_dir = stat_buf.st_mode & S_IFDIR;
 
+#ifdef HAVE_UMASK
   /* Obtain the umask without distroying the setting.  */
   mode_mask = 0;
   mode_mask = umask (mode_mask);
   (void) umask (mode_mask);
+#else
+  honor_umask = false;
+#endif
 
   for (i = 0; i < mode_len; i++)
     {
@@ -113,7 +127,9 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 	  ugo[0] = false;
 	  ugo[1] = false;
 	  ugo[2] = false;
+#ifdef HAVE_UMASK
 	  honor_umask = true;
+#endif
 	}
       continue_clause = false; 
       rwxXstugo[0] = false;
@@ -140,7 +156,9 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 	      ugo[1] = true;
 	      ugo[2] = true;
 	      part = 1;
+#ifdef HAVE_UMASK
 	      honor_umask = false;
+#endif
 	      break;
 	    case 'u':
 	      if (part == 2)
@@ -153,7 +171,9 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 		return 1;
 	      ugo[0] = true;
 	      part = 1;
+#ifdef HAVE_UMASK
 	      honor_umask = false;
+#endif
 	      break;
 	    case 'g':
 	      if (part == 2)
@@ -166,7 +186,9 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 		return 1;
        	      ugo[1] = true;
 	      part = 1;
+#ifdef HAVE_UMASK
 	      honor_umask = false;
+#endif
 	      break;
 	    case 'o':
 	      if (part == 2)
@@ -179,7 +201,9 @@ chmod_func (char *name, char *mode, gfc_charlen_type name_len,
 		return 1;
 	      ugo[2] = true;
 	      part = 1;
+#ifdef HAVE_UMASK
 	      honor_umask = false;
+#endif
 	      break;
 
 	    /* Mode setting: =+-.  */
@@ -285,6 +309,18 @@ clause_done:
 
       new_mode = 0;
 
+#ifdef __MINGW32__
+
+      /* Read. */
+      if (rwxXstugo[0] && (ugo[0] || honor_umask))
+	new_mode |= _S_IREAD;
+
+      /* Write. */
+      if (rwxXstugo[1] && (ugo[0] || honor_umask))
+	new_mode |= _S_IWRITE;
+
+#else
+
       /* Read. */
       if (rwxXstugo[0])
 	{
@@ -400,12 +436,20 @@ clause_done:
 		new_mode |= S_IXGRP;
 	    }
 	}
+#endif  /* __MINGW32__ */
 
+#ifdef HAVE_UMASK
     if (honor_umask)
       new_mode &= ~mode_mask;
+#endif
 
     if (set_mode == 1)
       {
+#ifdef __MINGW32__
+	if (ugo[0] || honor_umask)
+	  file_mode = (file_mode & ~(_S_IWRITE | _S_IREAD))
+		      | (new_mode & (_S_IWRITE | _S_IREAD));
+#else
 	/* Set '='.  */
 	if ((ugo[0] || honor_umask) && !rwxXstugo[6])
 	  file_mode = (file_mode & ~(S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR))
@@ -420,21 +464,26 @@ clause_done:
 	  file_mode |= S_ISVTX;
 	else if (!is_dir)
 	  file_mode &= ~S_ISVTX;
+#endif
       }
     else if (set_mode == 2)
       {
 	/* Clear '-'.  */
 	file_mode &= ~new_mode;
+#ifndef __MINGW32__
 	if (rwxXstugo[5] || !is_dir)
 	  file_mode &= ~S_ISVTX;
+#endif
       }
     else if (set_mode == 3)
       {
 	file_mode |= new_mode;
+#ifndef __MINGW32__
 	if (rwxXstugo[5] && is_dir)
 	  file_mode |= S_ISVTX;
 	else if (!is_dir)
 	  file_mode &= ~S_ISVTX;
+#endif
       }
   }
 
@@ -442,7 +491,6 @@ clause_done:
 }
 
 
-
 extern void chmod_i4_sub (char *, char *, GFC_INTEGER_4 *,
 			  gfc_charlen_type, gfc_charlen_type);
 export_proto(chmod_i4_sub);