--- /dev/null
+/* Proxy shell designed for use with Emacs on Windows 95 and NT.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+
+ Accepts subset of Unix sh(1) command-line options, for compatability
+ with elisp code written for Unix. When possible, executes external
+ programs directly (a common use of /bin/sh by Emacs), otherwise
+ invokes the user-specified command processor to handle built-in shell
+ commands, batch files and interactive mode.
+
+ The main function is simply to process the "-c string" option in the
+ way /bin/sh does, since the standard Windows command shells use the
+ convention that everything after "/c" (the Windows equivalent of
+ "-c") is the input string.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <windows.h>
+
+#include <stdarg.h> /* va_args */
+#include <malloc.h> /* alloca */
+#include <stdlib.h> /* getenv */
+#include <string.h> /* strlen */
+
+
+/******* Mock C library routines *********************************/
+
+/* These routines are used primarily to minimize the executable size. */
+
+#define stdin GetStdHandle (STD_INPUT_HANDLE)
+#define stdout GetStdHandle (STD_OUTPUT_HANDLE)
+#define stderr GetStdHandle (STD_ERROR_HANDLE)
+
+int
+vfprintf(HANDLE hnd, char * msg, va_list args)
+{
+ DWORD bytes_written;
+ char buf[1024];
+
+ wvsprintf (buf, msg, args);
+ return WriteFile (hnd, buf, strlen (buf), &bytes_written, NULL);
+}
+
+int
+fprintf(HANDLE hnd, char * msg, ...)
+{
+ va_list args;
+ int rc;
+
+ va_start (args, msg);
+ rc = vfprintf (hnd, msg, args);
+ va_end (args);
+
+ return rc;
+}
+
+int
+printf(char * msg, ...)
+{
+ va_list args;
+ int rc;
+
+ va_start (args, msg);
+ rc = vfprintf (stdout, msg, args);
+ va_end (args);
+
+ return rc;
+}
+
+void
+fail (char * msg, ...)
+{
+ va_list args;
+
+ va_start (args, msg);
+ vfprintf (stderr, msg, args);
+ va_end (args);
+
+ exit (1);
+}
+
+void
+warn (char * msg, ...)
+{
+ va_list args;
+
+ va_start (args, msg);
+ vfprintf (stderr, msg, args);
+ va_end (args);
+}
+
+/******************************************************************/
+
+char *
+canon_filename (char *fname)
+{
+ char *p = fname;
+
+ while (*p)
+ {
+ if (*p == '/')
+ *p = '\\';
+ p++;
+ }
+
+ return fname;
+}
+
+char *
+skip_space (char *str)
+{
+ while (isspace (*str)) str++;
+ return str;
+}
+
+char *
+skip_nonspace (char *str)
+{
+ while (*str && !isspace (*str)) str++;
+ return str;
+}
+
+int escape_char = '\\';
+
+/* Get next token from input, advancing pointer. */
+int
+get_next_token (char * buf, char ** pSrc)
+{
+ char * p = *pSrc;
+ char * o = buf;
+
+ p = skip_space (p);
+ if (*p == '"')
+ {
+ int escape_char_run = 0;
+
+ /* Go through src until an ending quote is found, unescaping
+ quotes along the way. If the escape char is not quote, then do
+ special handling of multiple escape chars preceding a quote
+ char (ie. the reverse of what Emacs does to escape quotes). */
+ p++;
+ while (1)
+ {
+ if (p[0] == escape_char && escape_char != '"')
+ {
+ escape_char_run++;
+ continue;
+ }
+ else if (p[0] == '"')
+ {
+ while (escape_char_run > 1)
+ {
+ *o++ = escape_char;
+ escape_char_run -= 2;
+ }
+
+ if (escape_char_run > 0)
+ {
+ /* escaped quote */
+ *o++ = *p++;
+ escape_char_run = 0;
+ }
+ else if (p[1] == escape_char && escape_char == '"')
+ {
+ /* quote escaped by doubling */
+ *o++ = *p;
+ p += 2;
+ }
+ else
+ {
+ /* The ending quote. */
+ *o = '\0';
+ /* Leave input pointer after token. */
+ p++;
+ break;
+ }
+ }
+ else if (p[0] == '\0')
+ {
+ /* End of string, but no ending quote found. We might want to
+ flag this as an error, but for now will consider the end as
+ the end of the token. */
+ *o = '\0';
+ break;
+ }
+ else
+ {
+ *o++ = *p++;
+ }
+ }
+ }
+ else
+ {
+ /* Next token is delimited by whitespace. */
+ char * p1 = skip_nonspace (p);
+ memcpy (o, p, p1 - p);
+ o += (p1 - p);
+ p = p1;
+ }
+
+ *pSrc = p;
+
+ return o - buf;
+}
+
+/* Search for EXEC file in DIR. If EXEC does not have an extension,
+ DIR is searched for EXEC with the standard extensions appended. */
+int
+search_dir (char *dir, char *exec, int bufsize, char *buffer)
+{
+ char *exts[] = {".bat", ".cmd", ".exe", ".com"};
+ int n_exts = sizeof (exts) / sizeof (char *);
+ char *dummy;
+ int i, rc;
+
+ /* Search the directory for the program. */
+ for (i = 0; i < n_exts; i++)
+ {
+ rc = SearchPath (dir, exec, exts[i], bufsize, buffer, &dummy);
+ if (rc > 0)
+ return rc;
+ }
+
+ return 0;
+}
+
+/* Return the absolute name of executable file PROG, including
+ any file extensions. If an absolute name for PROG cannot be found,
+ return NULL. */
+char *
+make_absolute (char *prog)
+{
+ char absname[MAX_PATH];
+ char dir[MAX_PATH];
+ char curdir[MAX_PATH];
+ char *p, *fname;
+ char *path;
+ int i;
+
+ /* At least partial absolute path specified; search there. */
+ if ((isalpha (prog[0]) && prog[1] == ':') ||
+ (prog[0] == '\\'))
+ {
+ /* Split the directory from the filename. */
+ fname = strrchr (prog, '\\');
+ if (!fname)
+ /* Only a drive specifier is given. */
+ fname = prog + 2;
+ strncpy (dir, prog, fname - prog);
+ dir[fname - prog] = '\0';
+
+ /* Search the directory for the program. */
+ if (search_dir (dir, prog, MAX_PATH, absname) > 0)
+ return strdup (absname);
+ else
+ return NULL;
+ }
+
+ if (GetCurrentDirectory (MAX_PATH, curdir) <= 0)
+ return NULL;
+
+ /* Relative path; search in current dir. */
+ if (strpbrk (prog, "\\"))
+ {
+ if (search_dir (curdir, prog, MAX_PATH, absname) > 0)
+ return strdup (absname);
+ else
+ return NULL;
+ }
+
+ /* Just filename; search current directory then PATH. */
+ path = alloca (strlen (getenv ("PATH")) + strlen (curdir) + 2);
+ strcpy (path, curdir);
+ strcat (path, ";");
+ strcat (path, getenv ("PATH"));
+
+ while (*path)
+ {
+ /* Get next directory from path. */
+ p = path;
+ while (*p && *p != ';') p++;
+ strncpy (dir, path, p - path);
+ dir[p - path] = '\0';
+
+ /* Search the directory for the program. */
+ if (search_dir (dir, prog, MAX_PATH, absname) > 0)
+ return strdup (absname);
+
+ /* Move to the next directory. */
+ path = p + 1;
+ }
+
+ return NULL;
+}
+
+/*****************************************************************/
+
+#if 0
+char ** _argv;
+int _argc;
+
+/* Parse commandline into argv array, allowing proper quoting of args. */
+void
+setup_argv (void)
+{
+ char * cmdline = GetCommandLine ();
+ int arg_bytes = 0;
+
+
+}
+#endif
+
+/* Information about child proc is global, to allow for automatic
+ termination when interrupted. At the moment, only one child process
+ can be running at any one time. */
+
+PROCESS_INFORMATION child;
+int interactive = TRUE;
+
+BOOL
+console_event_handler (DWORD event)
+{
+ switch (event)
+ {
+ case CTRL_C_EVENT:
+ case CTRL_BREAK_EVENT:
+ if (!interactive)
+ {
+ /* Both command.com and cmd.exe have the annoying behaviour of
+ prompting "Terminate batch job (y/n)?" when interrupted
+ while running a batch file, even if running in
+ non-interactive (-c) mode. Try to make up for this
+ deficiency by forcibly terminating the subprocess if
+ running non-interactively. */
+ if (child.hProcess &&
+ WaitForSingleObject (child.hProcess, 500) != WAIT_OBJECT_0)
+ TerminateProcess (child.hProcess, 0);
+ exit (STATUS_CONTROL_C_EXIT);
+ }
+ break;
+
+#if 0
+ default:
+ /* CLOSE, LOGOFF and SHUTDOWN events - actually we don't get these
+ under Windows 95. */
+ fail ("cmdproxy: received %d event\n", event);
+ if (child.hProcess)
+ TerminateProcess (child.hProcess, 0);
+#endif
+ }
+ return TRUE;
+}
+
+int
+spawn (char * progname, char * cmdline)
+{
+ DWORD rc = 0xff;
+ SECURITY_ATTRIBUTES sec_attrs;
+ STARTUPINFO start;
+
+ sec_attrs.nLength = sizeof (sec_attrs);
+ sec_attrs.lpSecurityDescriptor = NULL;
+ sec_attrs.bInheritHandle = FALSE;
+
+ memset (&start, 0, sizeof (start));
+ start.cb = sizeof (start);
+
+ if (CreateProcess (progname, cmdline, &sec_attrs, NULL, TRUE,
+ 0, NULL, NULL, &start, &child))
+ {
+ /* wait for completion and pass on return code */
+ WaitForSingleObject (child.hProcess, INFINITE);
+ GetExitCodeProcess (child.hProcess, &rc);
+ CloseHandle (child.hThread);
+ CloseHandle (child.hProcess);
+ child.hProcess = NULL;
+ }
+
+ return (int) rc;
+}
+
+/******* Main program ********************************************/
+
+int
+main (int argc, char ** argv)
+{
+ int rc;
+ int need_shell;
+ char * cmdline;
+ char * progname;
+ int envsize;
+ char modname[MAX_PATH];
+ char path[MAX_PATH];
+
+
+ interactive = TRUE;
+
+ SetConsoleCtrlHandler ((PHANDLER_ROUTINE) console_event_handler, TRUE);
+
+ /* We serve double duty: we can be called either as a proxy for the
+ real shell (that is, because we are defined to be the user shell),
+ or in our role as a helper application for running DOS programs.
+ In the former case, we interpret the command line options as if we
+ were a Unix shell, but in the latter case we simply pass our
+ command line to CreateProcess. We know which case we are dealing
+ with by whether argv[0] refers to ourself or to some other program.
+ (This relies on an arcane feature of CreateProcess, where we can
+ specify cmdproxy as the module to run, but specify a different
+ program in the command line - the MSVC startup code sets argv[0]
+ from the command line.) */
+
+ if (!GetModuleFileName (NULL, modname, sizeof (modname)))
+ fail ("GetModuleFileName failed");
+
+ /* Although Emacs always sets argv[0] to an absolute pathname, we
+ might get run in other ways as well, so convert argv[0] to an
+ absolute name before comparing to the module name. */
+ if (!SearchPath (NULL, argv[0], ".exe", sizeof (path), path, &progname)
+ || stricmp (modname, path) != 0)
+ {
+ /* We are being used as a helper to run a DOS app; just pass
+ command line to DOS app without change. */
+ /* TODO: fill in progname. */
+ return spawn (NULL, GetCommandLine ());
+ }
+
+ /* Process command line. If running interactively (-c or /c not
+ specified) then spawn a real command shell, passing it the command
+ line arguments.
+
+ If not running interactively, then attempt to execute the specified
+ command directly. If necessary, spawn a real shell to execute the
+ command.
+
+ */
+
+ progname = NULL;
+ cmdline = NULL;
+ /* If no args, spawn real shell for interactive use. */
+ need_shell = TRUE;
+ interactive = TRUE;
+ /* Ask for a reasonable size environment for command.com. */
+ envsize = 1024;
+
+ while (--argc > 0)
+ {
+ ++argv;
+ /* Only support single letter switches (except for -e); allow / as
+ switch char for compatability with cmd.exe. */
+ if ( ((*argv)[0] == '-' || (*argv)[0] == '/')
+ && (*argv)[1] != '\0' && (*argv)[2] == '\0' )
+ {
+ if ( ((*argv)[1] == 'c') && ((*argv)[2] == '\0') )
+ {
+ if (--argc == 0)
+ fail ("error: expecting arg for %s", *argv);
+ cmdline = *(++argv);
+ interactive = FALSE;
+ }
+ else if ( ((*argv)[1] == 'i') && ((*argv)[2] == '\0') )
+ {
+ if (cmdline)
+ warn ("warning: %s ignored because of -c", *argv);
+ }
+ else if ( ((*argv)[1] == 'e') && ((*argv)[2] == ':') )
+ {
+ envsize = atoi (*argv + 3);
+ /* Enforce a reasonable minimum size. */
+ if (envsize < 256)
+ envsize = 256;
+ }
+ else
+ {
+ warn ("warning: unknown option %s ignored", *argv);
+ }
+ }
+ else
+ break;
+ }
+
+ /* If -c option, determine if we must spawn a real shell, or if we can
+ execute the command directly ourself. */
+ if (cmdline)
+ {
+ /* If no redirection or piping, and if program can be found, then
+ run program directly. Otherwise invoke a real shell. */
+
+ static char copout_chars[] = "|<>&";
+
+ if (strpbrk (cmdline, copout_chars) == NULL)
+ {
+ char *args;
+
+ /* The program name is the first token of cmdline. Since
+ filenames cannot legally contain embedded quotes, the value
+ of escape_char doesn't matter. */
+ args = cmdline;
+ if (!get_next_token (path, &args))
+ fail ("error: no program name specified.\n");
+
+ canon_filename (path);
+ progname = make_absolute (path);
+
+ /* If we found the program, run it directly (if not found it
+ might be an internal shell command, so don't fail). */
+ if (progname != NULL)
+ need_shell = FALSE;
+ }
+ }
+
+ if (need_shell)
+ {
+ char * p;
+
+ progname = getenv ("COMSPEC");
+ if (!progname)
+ fail ("error: COMSPEC is not set");
+
+ canon_filename (progname);
+ progname = make_absolute (progname);
+
+ if (progname == NULL || strchr (progname, '\\') == NULL)
+ fail ("make_absolute failed");
+
+ if (cmdline)
+ {
+ /* Convert to syntax expected by cmd.exe/command.com for
+ running non-interactively. Always quote program name in
+ case path contains spaces (fortunately it can't contain
+ quotes, since they are illegal in path names). */
+ wsprintf (p = alloca (strlen (cmdline) + strlen (progname) + 7),
+ "\"%s\" /c %s", progname, cmdline);
+ cmdline = p;
+ }
+ else
+ {
+ /* Provide dir arg expected by command.com when first started
+ interactively (the "command search path"). cmd.exe does
+ not require it, but accepts it silently - presumably other
+ DOS compatible shells do the same. To avoid potential
+ problems with spaces in command dir (which cannot be quoted
+ - command.com doesn't like it), we always use the 8.3 form. */
+ GetShortPathName (progname, path, sizeof (path));
+ p = strrchr (path, '\\');
+ /* Trailing slash is acceptable. */
+ p++;
+
+ /* Set environment size - again cmd.exe ignores this silently. */
+ wsprintf (p, " /e:%d", envsize);
+
+ /* Quote progname in case it contains spaces. */
+ wsprintf (cmdline = alloca (strlen (progname) + strlen (path) + 4),
+ "\"%s\" %s", progname, path);
+ }
+ }
+
+ if (!progname)
+ fail ("Internal error: program name not defined\n");
+
+ if (!cmdline)
+ cmdline = progname;
+
+ rc = spawn (progname, cmdline);
+
+ return rc;
+}
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