shell_file = getenv ("SHELL");
if (shell_file == NULL)
shell_file = default_shell_file;
-
- len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10;
+
+ /* Multiplying the length of exec_file by 4 is to account for the fact
+ that it may expand when quoted; it is a worst-case number based on
+ every character being '. */
+ len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 12;
/* If desired, concat something onto the front of ALLARGS.
SHELL_COMMAND is the result. */
#ifdef SHELL_COMMAND_CONCAT
shell_command[0] = '\0';
#endif
strcat (shell_command, "exec ");
- strcat (shell_command, exec_file);
+
+ /* Now add exec_file, quoting as necessary. Quoting in this style is
+ said to work with all shells. */
+ {
+ char *p;
+
+ strcat (shell_command, "'");
+ for (p = exec_file; *p != '\0'; ++p)
+ {
+ if (*p == '\'')
+ strcat (shell_command, "'\\''");
+ else
+ strncat (shell_command, p, 1);
+ }
+ strcat (shell_command, "'");
+ }
+
strcat (shell_command, " ");
strcat (shell_command, allargs);