* cygwin.din: Export endusershell, getusershell and setusershell.

* syscalls.cc (getusershell): New function.
	(setusershell): Ditto.
	(endusershell): Ditto.
	* include/cygwin/version.h: Bump API minor number.

winsup/cygwin/ChangeLog

@@ -1,3 +1,11 @@
+2003-09-08  Corinna Vinschen  <corinna@vinschen.de>
+
+	* cygwin.din: Export endusershell, getusershell and setusershell.
+	* syscalls.cc (getusershell): New function.
+	(setusershell): Ditto.
+	(endusershell): Ditto.
+	* include/cygwin/version.h: Bump API minor number.
+
 2003-09-08  Nicholas Wourms  <nwourms@netscape.net>
 
 	* cygwin.din: Export argz_add argz_add_sep argz_append argz_count

winsup/cygwin/cygwin.din

@@ -289,6 +289,7 @@ cygwin32_detach_dll = cygwin_detach_dll
 cygwin_dll_init
 endprotoent = cygwin_endprotoent
 endservent = cygwin_endservent
+endusershell
 gethostbyaddr = cygwin_gethostbyaddr
 gethostbyname = cygwin_gethostbyname
 _gethostname = cygwin_gethostname
@@ -302,6 +303,7 @@ getservbyport = cygwin_getservbyport
 getservent = cygwin_getservent
 getsockname = cygwin_getsockname
 getsockopt = cygwin_getsockopt
+getusershell
 herror = cygwin_herror
 hstrerror = cygwin_hstrerror
 inet_addr = cygwin_inet_addr
@@ -335,6 +337,7 @@ cygwin_set_impersonation_token
 setprotoent = cygwin_setprotoent
 setservent = cygwin_setservent
 setsockopt = cygwin_setsockopt
+setusershell
 shutdown = cygwin_shutdown
 socket = cygwin_socket
 cygwin_split_path

winsup/cygwin/include/cygwin/version.h

@@ -211,16 +211,17 @@ details. */
        89: Export __mempcpy
        90: Export _fopen64
        91: Export argz_add argz_add_sep argz_append argz_count argz_create
-         argz_create_sep argz_delete argz_extract argz_insert
-         argz_next argz_replace argz_stringify envz_add envz_entry
-         envz_get envz_merge envz_remove envz_strip
+	   argz_create_sep argz_delete argz_extract argz_insert
+	   argz_next argz_replace argz_stringify envz_add envz_entry
+	   envz_get envz_merge envz_remove envz_strip
+       92: Export getusershell, setusershell, eetusershell
 
      */
 
      /* Note that we forgot to bump the api for ualarm, strtoll, strtoull */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 91
+#define CYGWIN_VERSION_API_MINOR 92
 
      /* There is also a compatibity version number associated with the
 	shared memory regions.  It is incremented when incompatible

winsup/cygwin/syscalls.cc

@@ -30,6 +30,8 @@ details. */
 #include <process.h>
 #include <utmp.h>
 #include <sys/uio.h>
+#include <errno.h>
+#include <ctype.h>
 #include <limits.h>
 #include <unistd.h>
 #include <setjmp.h>
@@ -2897,3 +2899,67 @@ long gethostid(void)
 
   return hostid;
 }
+
+#define ETC_SHELLS "/etc/shells"
+static int shell_index;
+static FILE *shell_fp;
+
+extern "C" char *
+getusershell ()
+{
+  /* List of default shells if no /etc/shells exists, defined as on Linux.
+     FIXME: SunOS has a far longer list, containing all shells which
+     might be shipped with the OS.  Should we do the same for the Cygwin
+     distro, adding bash, tcsh, ksh, pdksh and zsh?  */
+  static NO_COPY const char *def_shells[] = {
+    "/bin/sh",
+    "/bin/csh",
+    "/usr/bin/sh",
+    "/usr/bin/csh",
+    NULL
+  };
+  static char buf[MAX_PATH];
+  int ch, buf_idx;
+
+  if (!shell_fp && !(shell_fp = fopen (ETC_SHELLS, "rt")))
+    {
+      if (def_shells[shell_index])
+        return strcpy (buf, def_shells[shell_index++]);
+      return NULL;
+    }
+  /* Skip white space characters. */
+  while ((ch = getc (shell_fp)) != EOF && isspace (ch))
+    ;
+  /* Get each non-whitespace character as part of the shell path as long as
+     it fits in buf. */
+  for (buf_idx = 0;
+       ch != EOF && !isspace (ch) && buf_idx < MAX_PATH;
+       buf_idx++, ch = getc (shell_fp))
+    buf[buf_idx] = ch;
+  /* Skip any trailing non-whitespace character not fitting in buf.  If the
+     path is longer than MAX_PATH, it's invalid anyway. */
+  while (ch != EOF && !isspace (ch))
+    ch = getc (shell_fp);
+  if (buf_idx)
+    {
+      buf[buf_idx] = '\0';
+      return buf;
+    }
+  return NULL;
+}
+
+extern "C" void
+setusershell ()
+{
+  if (shell_fp)
+    fseek (shell_fp, 0L, SEEK_SET);
+  shell_index = 0;
+}
+
+extern "C" void
+endusershell ()
+{
+  if (shell_fp)
+    fclose (shell_fp);
+  shell_index = 0;
+}