2. The parser, which asks the command line from the user.
3. The dispatcher, which analyzes the command line and calls the appropriate handler function.
4. A command pattern matcher which is used along with the readline completion feature.
-5. A function which tells the user that an internal error has occured.
+5. A function which tells the user that an internal error has occurred.
First written on: March 30 1995
Copyright (C) 1995 Gadi Oxman
*/
-
+
+#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <signal.h>
+#ifdef HAVE_READLINE
#include <readline.h>
#include <history.h>
+#endif
+
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern int optind;
+extern char *optarg;
+#endif
#include "ext2ed.h"
char Ext2Descriptors [200]="ext2.descriptors"; /* The location of the ext2 filesystem object definition */
char AlternateDescriptors [200]=""; /* We allow the user to define additional structures */
char LogFile [200]="ext2ed.log"; /* The location of the log file - Each write will be logged there */
-int LogChanges=1; /* 1 enables logging, 0 diables logging */
+int LogChanges=1; /* 1 enables logging, 0 disables logging */
int AllowChanges=0; /* When set, the enablewrite command will fail */
int AllowMountedRead=0; /* Behavior when trying to open a mounted filesystem read-only */
int ForceExt2=0; /* When set, ext2 autodetection is overridden */
FILE *device_handle=NULL; /* This is passed to the fopen / fread ... commands */
long device_offset; /* The current position in the filesystem */
/* Note that we have a 2 GB limitation */
-
+
int mounted=0; /* This is set when we find that the filesystem is mounted */
struct struct_commands general_commands,ext2_commands; /* Used to define the general and ext2 commands */
int redraw_request=0; /* Is set by a signal handler to handle terminal */
/* screen size change. */
-char email_address [80]="tgud@tochnapc2.technion.ac.il";
-
-int main (void)
-/* We just call the parser to get commands from the user. We quit when parser returns. */
+/*
+ * We just call the parser to get commands from the user. We quit when
+ * parser returns.
+ */
+int main (int argc, char **argv)
{
- if (!init ()) return (0); /* Perform some initial initialization */
- /* Quit if failed */
-
- parser (); /* Get and parse user commands */
-
- prepare_to_close (); /* Do some cleanup */
- printf ("Quitting ...\n");
- return (1); /* And quit */
+ int write_priv = 0;
+ int c;
+ char *buf;
+
+ if (!init ())
+ return (1);
+ while ((c = getopt (argc, argv, "w")) != EOF) {
+ switch (c) {
+ case 'w':
+ write_priv++;
+ break;
+ }
+ }
+ if (optind < argc) {
+ buf = malloc(strlen(argv[optind]) + 32);
+ if (!buf) {
+ fprintf(stderr, "Couldn't allocate filename buffer\n");
+ exit(1);
+ }
+ strcpy(buf, "set_device ");
+ strcat(buf, argv[optind]);
+ set_device(buf);
+ free(buf);
+ if (write_priv) {
+ wprintw (command_win,"\n");
+ enable_write("enable_write");
+ }
+ }
+ parser (); /* Get and parse user commands */
+ prepare_to_close(); /* Do some cleanup */
+ printf("Quitting ...\n");
+ return(0);
}
-void parser (void)
-
/*
+ * Read a character from the command window
+ */
+int command_read_key()
+{
+ int key = 0;
-This function asks the user for a command and calls the dispatcher function, dispatch, to analyze it.
-We use the readline library function readline to read the command, hence all the usual readline keys
-are available.
-The new command is saved both in the readline's history and in our tiny one-command cache, so that
-only the enter key is needed to retype it.
+ while (!key) {
+ if (redraw_request) {
+ redraw_all();
+ redraw_request=0;
+ }
+ key = wgetch(command_win);
+ switch (key) {
+ case 0x1A:
+ key = 0;
+ kill(getpid(), SIGTSTP);
+ break;
+
+ case KEY_NPAGE:
+ pgdn("");
+ refresh_command_win ();
+ break;
+
+ case KEY_PPAGE:
+ pgup("");
+ refresh_command_win ();
+ break;
+ case ERR:
+ key = 0;
+ break;
+
+ case KEY_BACKSPACE:
+ key = '\b';
+ }
+ if ((key < 32 && key != '\b' && key != '\n') ||
+ (key > 127))
+ key = 0;
+ }
+ return key;
+}
-*/
+#ifdef HAVE_READLINE
+int rl_getc_replacement(FILE *f)
+{
+ int key = command_read_key();
+
+ if (key == '\b') {
+ if (rl_point > 0)
+ wprintw(command_win, "\b \b");
+ } else
+ wprintw(command_win, "%c", key);
+ return key;
+}
+/*
+ * This function asks the user for a command and calls the dispatcher
+ * function, dispatch, to analyze it. We use the readline library
+ * function readline to read the command, hence all the usual readline
+ * keys are available. The new command is saved both in the
+ * readline's history and in our tiny one-command cache, so that only
+ * the enter key is needed to retype it.
+ */
+void parser (void)
{
char *ptr,command_line [80];
int quit=0;
- while (!quit) {
-
- if (redraw_request) { /* Terminal screen size has changed */
- dispatch ("redraw");dispatch ("show");redraw_request=0;
- }
+#if 0
+ noecho();
+ cbreak();
+ keypad(command_win, 1);
+ wtimeout(command_win, 100);
- wmove (command_win,0,0);wclrtoeol (command_win);refresh_command_win ();
+ rl_getc_function = rl_getc_replacement;
+#endif
- mvcur (-1,-1,LINES-COMMAND_WIN_LINES,0); /* At last ! I spent ** days ** on this one */
+ while (!quit) {
+ /* Terminal screen size has changed */
+ if (redraw_request) {
+ redraw_all();
+ redraw_request=0;
+ }
- /* The ncurses library optimizes cursor movement by */
- /* keeping track of the cursor position. However, by */
- /* using the readline library I'm breaking its */
- /* assumptions. The double -1 arguments tell ncurses */
- /* to disable cursor movement optimization this time. */
- //echo ();
- ptr=readline ("ext2ed > "); /* Read the user's command line. */
- //noecho ();
+ wmove (command_win,0,0);
+ wclrtoeol (command_win);
+ wprintw (command_win,"ext2ed > ");
+ refresh_command_win ();
- strcpy (command_line,ptr); /* Readline allocated the buffer - Copy the string */
- free (ptr); /* and free the allocated buffer */
+ /*
+ * The ncurses library optimizes cursor movement by
+ * keeping track of the cursor position. However, by
+ * using the readline library I'm breaking its
+ * assumptions. The double -1 arguments tell ncurses
+ * to disable cursor movement optimization this
+ * time.
+ */
+ mvcur (-1,-1,LINES-COMMAND_WIN_LINES,0);
+
+ /* echo (); */
+ ptr=readline ("ext2ed > ");
+ /* noecho (); */
+
+ /*
+ * Readline allocated the buffer - Copy the string
+ * and free the allocated buffer
+ * XXX WHY???
+ */
+ strcpy (command_line,ptr);
+ free (ptr);
if (*command_line != 0)
- add_history (command_line); /* Add the non-empty command to the command histroy */
+ add_history (command_line);
- if (*command_line==0) /* If only enter was pressed, recall the last command */
+ /* If only enter was pressed, recall the last command */
+ if (*command_line==0)
strcpy (command_line,last_command_line);
-
- /* Emulate readline's actions for ncurses */
-
- mvcur (-1,-1,LINES-COMMAND_WIN_LINES,0); /* Again, needed for correct integration of the */
- /* ncurses and readline libraries */
+ /* Emulate readline's actions for ncurses */
+ mvcur (-1,-1,LINES-COMMAND_WIN_LINES,0);
werase (command_win);
- wprintw (command_win,"ext2ed > ");wprintw (command_win,command_line);
- wprintw (command_win,"\n");refresh_command_win ();
+ wprintw (command_win,"ext2ed > ");
+ wprintw (command_win,command_line);
+ wprintw (command_win,"\n");
+ refresh_command_win ();
- strcpy (last_command_line,command_line); /* Save this command in our tiny cache */
+ /* Save this command in our tiny cache */
+ strcpy (last_command_line,command_line);
- quit=dispatch (command_line); /* And call dispatch to do the actual job */
- }
+ /* And call dispatch to do the actual job */
+ quit=dispatch (command_line);
+ }
+}
+#else
+void read_line(char * foo) {
+ char * chptr = foo;
+ int ch;
+ int done = 0;
+
+ while (!done && (ch = command_read_key())) {
+ switch (ch) {
+ case '\n':
+ done = 1;
+ break;
+
+ case '\b':
+ if (chptr > foo) {
+ wprintw(command_win, "\b \b");
+ chptr--;
+ }
+ break;
+
+ default:
+ if (ch > 256)
+ break;
+ if (ch == '\n') break;
+ *chptr++ = ch;
+ wprintw(command_win, "%c", ch);
+ break;
+ }
+ }
+ *chptr = '\0';
}
+void parser (void)
+{
+ char command_line [80];
+ int quit=0;
-int dispatch (char *command_line)
+ noecho();
+ cbreak();
+ wtimeout(command_win, 100);
+ keypad(command_win, 1);
-/*
+ while (!quit) {
+ /* Terminal screen size has changed */
+ if (redraw_request) {
+ redraw_all();
+ redraw_request=0;
+ }
-This is a very important function. Its task is to recieve a command name and link it to a C function.
-There are three type of commands:
+ wmove (command_win,0,0);wclrtoeol (command_win);
-1. General commands - Always available and accessed through general_commands.
-2. Ext2 specific commands - Available when editing an ext2 filesystem, accessed through ext2_commands.
-3. Type specific commands - Those are changing according to the current type. The global
- variable current_type points to the current object definition (of type struct_descriptor).
- In it, the struct_commands entry contains the type specific commands links.
-
-Overriding is an important feature - Much like in C++ : The same command name can dispatch to different
-functions. The overriding priority is 3,2,1; That is - A type specific command will always override a
-general command. This is used through the program to allow fine tuned operation.
+ wmove(command_win, 0, 0);
+ wprintw(command_win, "ext2ed > ");
+ read_line(command_line);
-When an handling function is found, it is called along with the command line that was passed to us. The handling
-function is then free to interpert the arguments in its own style.
+ /* If only enter was pressed, recall the last command */
+ if (*command_line==0)
+ strcpy (command_line,last_command_line);
+
+ mvcur (-1,-1,LINES-COMMAND_WIN_LINES + 1,0);
+
+ strcpy (last_command_line,command_line); /* Save this command in our tiny cache */
+
+ /* And call dispatch to do the actual job */
+ quit=dispatch (command_line);
+ }
+}
+#endif
-*/
+/*
+ * This is a very important function. Its task is to receive a command
+ * name and link it to a C function. There are three types of commands:
+ *
+ * 1. General commands - Always available and accessed through
+ * general_commands.
+ * 2. Ext2 specific commands - Available when editing an ext2
+ * filesystem, accessed through ext2_commands.
+ * 3. Type specific commands - Those are changing according to the
+ * current type. The global variable current_type points to the
+ * current object definition (of type struct_descriptor). In it, the
+ * struct_commands entry contains the type specific commands links.
+ *
+ * Overriding is an important feature - Much like in C++ : The same
+ * command name can dispatch to different functions. The overriding
+ * priority is 3,2,1; That is - A type specific command will always
+ * override a general command. This is used through the program to
+ * allow fine tuned operation.
+ *
+ * When an handling function is found, it is called along with the
+ * command line that was passed to us. The handling function is then
+ * free to interpret the arguments in its own style.
+ */
+int dispatch (char *command_line)
{
int i,found=0;
-
+
char command [80];
parse_word (command_line,command);
-
- if (strcasecmp (command,"quit")==0) return (1);
- /* 1. Search for type specific commands FIRST - Allows overriding of a general command */
+ if (strcasecmp (command,"quit")==0) return (1);
+
+ /* 1. Search for type specific commands FIRST - Allows
+ overriding of a general command */
if (current_type != NULL)
- for (i=0;i<=current_type->type_commands.last_command && !found;i++) {
+ for (i=0;
+ i<=current_type->type_commands.last_command && !found;
+ i++) {
if (strcasecmp (command,current_type->type_commands.names [i])==0) {
(*current_type->type_commands.callback [i]) (command_line);
found=1;
}
}
-
+
/* 3. If not found, search the general commands */
-
+
if (!found)
for (i=0;i<=general_commands.last_command && !found;i++) {
if (strcasecmp (command,general_commands.names [i])==0) {
}
/* 4. If not found, issue an error message and return */
-
+
if (!found) {
wprintw (command_win,"Error: Unknown command\n");
refresh_command_win ();
}
-
+
return (0);
}
-char *parse_word (char *source,char *dest)
/*
-
-This function copies the next word in source to the variable dest, ignoring whitespaces.
-It returns a pointer to the next word in source.
-It is used to split the command line into command and arguments.
-
-*/
-
+ *
+ * This function copies the next word in source to the variable dest,
+ * ignoring whitespaces. It returns a pointer to the next word in
+ * source. It is used to split the command line into command and arguments.
+ */
+char *parse_word (char *source,char *dest)
{
char ch,*source_ptr,*target_ptr;
-
+
if (*source==0) {
*dest=0;
return (source);
};
-
+
source_ptr=source;target_ptr=dest;
do {
ch=*source_ptr++;
while (ch>' ' && ch<='z') {
*target_ptr++=ch;
- ch=*source_ptr++;
+ ch=*source_ptr++;
}
*target_ptr=0;
return (--source_ptr);
}
-char *complete_command (char *text,int state)
-
/*
-
-text is the partial command entered by the user; We assume that it is a part of a command - I didn't write code
-for smarter completion.
-
-The state variable is an index which tells us how many possible completions we already returned to readline.
-
-We return only one possible completion or (char *) NULL if there are no more completions. This
-function will be called by readline over and over until we tell it to stop.
-
-While scanning for possible completions, we use the same priority definition which was used in dispatch.
-
-*/
-
+ * text is the partial command entered by the user; We assume that it
+ * is a part of a command - I didn't write code for smarter completion.
+ *
+ * The state variable is an index which tells us how many possible
+ * completions we already returned to readline.
+ *
+ * We return only one possible completion or (char *) NULL if there
+ * are no more completions. This function will be called by readline
+ * over and over until we tell it to stop.
+ *
+ * While scanning for possible completions, we use the same priority
+ * definition which was used in dispatch.
+ */
+#if HAVE_READLINE
+char *complete_command (char *text,int state)
{
int state_index=-1;
int i,len;
-
+
len=strlen (text);
/* Is the command type specific ? */
}
}
- /* No, pehaps ext2 specific command then ? */
-
+ /* No, perhaps ext2 specific command then ? */
+
for (i=0;i<=ext2_commands.last_command;i++) {
if (strncmp (ext2_commands.names [i],text,len)==0) {
state_index++;
}
}
-
+
/* Check for a general command */
-
+
for (i=0;i<=general_commands.last_command;i++) {
if (strncmp (general_commands.names [i],text,len)==0) {
state_index++;
}
/* quit is handled differently */
-
+
if (strncmp ("quit",text,len)==0) {
state_index++;
if (state==state_index)
- return (dupstr ("quit"));
+ return (dupstr ("quit"));
}
/* No more completions */
-
+
return ((char *) NULL);
}
+#endif
-char *dupstr (char *src)
-
-/*
-
-Nothing special - Just allocates enough space and copy the string.
-
-*/
+/*
+ * Nothing special - Just allocates enough space and copy the string.
+ */
+char *dupstr (char *src)
{
char *ptr;
-
+
ptr=(char *) malloc (strlen (src)+1);
+ if (!ptr)
+ return NULL;
strcpy (ptr,src);
return (ptr);
}
#ifdef DEBUG
-
-void internal_error (char *description,char *source_name,char *function_name)
-
/*
-
-This function reports an internal error. It is almost not used. One place in which I do check for internal
-errors is disk.c.
-
-We just report the error, and try to continue ...
-
-*/
-
+ * This function reports an internal error. It is almost not used. One
+ * place in which I do check for internal errors is disk.c.
+ *
+ * We just report the error, and try to continue ...
+ */
+void internal_error (char *description,char *source_name,char *function_name)
{
wprintw (command_win,"Internal error - Found by source: %s.c , function: %s\n",source_name,function_name);
- wprintw (command_win,"\t%s\n",description);
+ wprintw (command_win,"\t%s\n",description);
wprintw (command_win,"Press enter to (hopefully) continue\n");
refresh_command_win ();getch ();werase (command_win);
}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff