home *** CD-ROM | disk | FTP | other *** search
- /* fileman.c -- A tiny application which demonstrates how to use the
- GNU Readline library. This application interactively allows users
- to manipulate files and their modes. */
-
- #include <stdio.h>
- #include <readline.h>
- #include <history.h>
- #include <sys/types.h>
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <errno.h>
-
- /* The names of functions that actually do the manipulation. */
- int com_list (), com_view (), com_rename (), com_stat (), com_pwd ();
- int com_delete (), com_help (), com_cd (), com_quit ();
-
- /* A structure which contains information on the commands this program
- can understand. */
-
- typedef struct {
- char *name; /* User printable name of the function. */
- Function *func; /* Function to call to do the job. */
- char *doc; /* Documentation for this function. */
- } COMMAND;
-
- COMMAND commands[] = {
- { "cd", com_cd, "Change to directory DIR" },
- { "delete", com_delete, "Delete FILE" },
- { "help", com_help, "Display this text" },
- { "?", com_help, "Synonym for `help'" },
- { "list", com_list, "List files in DIR" },
- { "ls", com_list, "Synonym for `list'" },
- { "pwd", com_pwd, "Print the current working directory" },
- { "quit", com_quit, "Quit using Fileman" },
- { "rename", com_rename, "Rename FILE to NEWNAME" },
- { "stat", com_stat, "Print out statistics on FILE" },
- { "view", com_view, "View the contents of FILE" },
- { (char *)NULL, (Function *)NULL, (char *)NULL }
- };
-
- /* The name of this program, as taken from argv[0]. */
- char *progname;
-
- /* When non-zero, this global means the user is done using this program. */
- int done = 0;
-
- main (argc, argv)
- int argc;
- char **argv;
- {
- progname = argv[0];
-
- initialize_readline (); /* Bind our completer. */
-
- /* Loop reading and executing lines until the user quits. */
- while (!done)
- {
- char *line;
-
- line = readline ("FileMan: ");
-
- if (!line)
- {
- done = 1; /* Encountered EOF at top level. */
- }
- else
- {
- /* Remove leading and trailing whitespace from the line.
- Then, if there is anything left, add it to the history list
- and execute it. */
- stripwhite (line);
-
- if (*line)
- {
- add_history (line);
- execute_line (line);
- }
- }
-
- if (line)
- free (line);
- }
- exit (0);
- }
-
- /* Execute a command line. */
- execute_line (line)
- char *line;
- {
- register int i;
- COMMAND *find_command (), *command;
- char *word;
-
- /* Isolate the command word. */
- i = 0;
- while (line[i] && !whitespace (line[i]))
- i++;
-
- word = line;
-
- if (line[i])
- line[i++] = '\0';
-
- command = find_command (word);
-
- if (!command)
- {
- fprintf (stderr, "%s: No such command for FileMan.\n", word);
- return;
- }
-
- /* Get argument to command, if any. */
- while (whitespace (line[i]))
- i++;
-
- word = line + i;
-
- /* Call the function. */
- (*(command->func)) (word);
- }
-
- /* Look up NAME as the name of a command, and return a pointer to that
- command. Return a NULL pointer if NAME isn't a command name. */
- COMMAND *
- find_command (name)
- char *name;
- {
- register int i;
-
- for (i = 0; commands[i].name; i++)
- if (strcmp (name, commands[i].name) == 0)
- return (&commands[i]);
-
- return ((COMMAND *)NULL);
- }
-
- /* Strip whitespace from the start and end of STRING. */
- stripwhite (string)
- char *string;
- {
- register int i = 0;
-
- while (whitespace (string[i]))
- i++;
-
- if (i)
- strcpy (string, string + i);
-
- i = strlen (string) - 1;
-
- while (i > 0 && whitespace (string[i]))
- i--;
-
- string[++i] = '\0';
- }
-
- /* **************************************************************** */
- /* */
- /* Interface to Readline Completion */
- /* */
- /* **************************************************************** */
-
- /* Tell the GNU Readline library how to complete. We want to try to complete
- on command names if this is the first word in the line, or on filenames
- if not. */
- initialize_readline ()
- {
- char **fileman_completion ();
-
- /* Allow conditional parsing of the ~/.inputrc file. */
- rl_readline_name = "FileMan";
-
- /* Tell the completer that we want a crack first. */
- rl_attempted_completion_function = (Function *)fileman_completion;
- }
-
- /* Attempt to complete on the contents of TEXT. START and END show the
- region of TEXT that contains the word to complete. We can use the
- entire line in case we want to do some simple parsing. Return the
- array of matches, or NULL if there aren't any. */
- char **
- fileman_completion (text, start, end)
- char *text;
- int start, end;
- {
- char **matches;
- char *command_generator ();
-
- matches = (char **)NULL;
-
- /* If this word is at the start of the line, then it is a command
- to complete. Otherwise it is the name of a file in the current
- directory. */
- if (start == 0)
- matches = completion_matches (text, command_generator);
-
- return (matches);
- }
-
- /* Generator function for command completion. STATE lets us know whether
- to start from scratch; without any state (i.e. STATE == 0), then we
- start at the top of the list. */
- char *
- command_generator (text, state)
- char *text;
- int state;
- {
- static int list_index, len;
- char *name;
-
- /* If this is a new word to complete, initialize now. This includes
- saving the length of TEXT for efficiency, and initializing the index
- variable to 0. */
- if (!state)
- {
- list_index = 0;
- len = strlen (text);
- }
-
- /* Return the next name which partially matches from the command list. */
- while (name = commands[list_index].name)
- {
- list_index++;
-
- if (strncmp (name, text, len) == 0)
- return (name);
- }
-
- /* If no names matched, then return NULL. */
- return ((char *)NULL);
- }
-
- /* **************************************************************** */
- /* */
- /* FileMan Commands */
- /* */
- /* **************************************************************** */
-
- /* String to pass to system (). This is for the LIST, VIEW and RENAME
- commands. */
- static char syscom[1024];
-
- /* List the file(s) named in arg. */
- com_list (arg)
- char *arg;
- {
- sprintf (syscom, "ls -FClg %s", arg);
- system (syscom);
- }
-
- com_view (arg)
- char *arg;
- {
- if (!valid_argument ("view", arg))
- return;
-
- sprintf (syscom, "cat %s | more", arg);
- system (syscom);
- }
-
- com_rename (arg)
- char *arg;
- {
- too_dangerous ("rename");
- }
-
- com_stat (arg)
- char *arg;
- {
- struct stat finfo;
-
- if (!valid_argument ("stat", arg))
- return;
-
- if (stat (arg, &finfo) == -1)
- {
- perror (arg);
- return;
- }
-
- printf ("Statistics for `%s':\n", arg);
-
- printf ("%s has %d link%s, and is %d bytes in length.\n", arg,
- finfo.st_nlink, (finfo.st_nlink == 1) ? "" : "s", finfo.st_size);
- printf (" Created on: %s", ctime (&finfo.st_ctime));
- printf (" Last access at: %s", ctime (&finfo.st_atime));
- printf ("Last modified at: %s", ctime (&finfo.st_mtime));
- }
-
- com_delete (arg)
- char *arg;
- {
- too_dangerous ("delete");
- }
-
- /* Print out help for ARG, or for all of the commands if ARG is
- not present. */
- com_help (arg)
- char *arg;
- {
- register int i;
- int printed = 0;
-
- for (i = 0; commands[i].name; i++)
- {
- if (!*arg || (strcmp (arg, commands[i].name) == 0))
- {
- printf ("%s\t\t%s.\n", commands[i].name, commands[i].doc);
- printed++;
- }
- }
-
- if (!printed)
- {
- printf ("No commands match `%s'. Possibilties are:\n", arg);
-
- for (i = 0; commands[i].name; i++)
- {
- /* Print in six columns. */
- if (printed == 6)
- {
- printed = 0;
- printf ("\n");
- }
-
- printf ("%s\t", commands[i].name);
- printed++;
- }
-
- if (printed)
- printf ("\n");
- }
- }
-
- /* Change to the directory ARG. */
- com_cd (arg)
- char *arg;
- {
- if (chdir (arg) == -1)
- perror (arg);
-
- com_pwd ("");
- }
-
- /* Print out the current working directory. */
- com_pwd (ignore)
- char *ignore;
- {
- char dir[1024];
-
- #ifdef ARCH
- (void) getcwd (dir, 1024);
- #else
- (void) getwd (dir);
- #endif
-
- printf ("Current directory is %s\n", dir);
- }
-
- /* The user wishes to quit using this program. Just set DONE non-zero. */
- com_quit (arg)
- char *arg;
- {
- done = 1;
- }
-
- /* Function which tells you that you can't do this. */
- too_dangerous (caller)
- char *caller;
- {
- fprintf (stderr,
- "%s: Too dangerous for me to distribute. Write it yourself.\n",
- caller);
- }
-
- /* Return non-zero if ARG is a valid argument for CALLER, else print
- an error message and return zero. */
- int
- valid_argument (caller, arg)
- char *caller, *arg;
- {
- if (!arg || !*arg)
- {
- fprintf (stderr, "%s: Argument required.\n", caller);
- return (0);
- }
-
- return (1);
- }
-
-
- /*
- * Local variables:
- * compile-command: "cc -g -I../.. -L.. -o fileman fileman.c -lreadline -ltermcap"
- * end:
- */
-