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