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/*
Prompt and command completion.
Copyright (C) 2006,2007,2009 Tavis Ormandy <taviso@sdf.lonestar.org>
Copyright (C) 2010,2011 Lu Wang <coolwanglu@gmail.com>
This file is part of scanmem.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <string.h>
#include <stdbool.h>
#if HAVE_LIBREADLINE
#include <readline/readline.h>
#include <readline/history.h>
#else
#include "readline.h"
#endif
#include "menu.h"
#include "getline.h"
#include "scanmem.h"
#include "commands.h"
#include "show_message.h"
/* command generator for readline completion */
static char *commandgenerator(const char *text, int state)
{
static unsigned index = 0;
unsigned i;
size_t len;
element_t *np;
globals_t *vars = &sm_globals;
/* reset generator if state == 0, otherwise continue from last time */
index = state ? index : 0;
np = vars->commands ? vars->commands->head : NULL;
len = strlen(text);
/* skip to the last node checked */
for (i = 0; np && i < index; i++)
np = np->next;
/* traverse the commands list, checking for matches */
while (np) {
command_t *command = np->data;
np = np->next;
/* record progress */
index++;
/* if shortdoc is NULL, this is not supposed to be user visible */
if (command == NULL || command->command == NULL
|| command->shortdoc == NULL)
continue;
/* check if we have a match */
if (strncmp(text, command->command, len) == 0) {
return strdup(command->command);
}
}
return NULL;
}
/* custom completor program for readline */
static char **commandcompletion(const char *text, int start, int end)
{
(void) end;
/* never use default completer (filenames), even if I dont generate any matches */
rl_attempted_completion_over = 1;
/* only complete on the first word, the command */
return start ? NULL : rl_completion_matches(text, commandgenerator);
}
/*
* getcommand() reads in a command using readline and places a pointer to
* the read string into *line, which must be free'd by caller.
* returns true on success, or false on error.
*/
bool getcommand(globals_t *vars, char **line)
{
char prompt[64];
bool success = true;
assert(vars != NULL);
if (vars->matches) {
snprintf(prompt, sizeof(prompt), "%ld> ", vars->num_matches);
} else {
snprintf(prompt, sizeof(prompt), "> ");
}
rl_readline_name = "scanmem";
rl_attempted_completion_function = commandcompletion;
while (true) {
success = ((*line = readline(prompt)) != NULL);
if (!success) {
/* EOF */
if ((*line = strdup("__eof")) == NULL) {
show_error("sorry, there was a memory allocation error.\n");
return false;
}
}
if (strlen(*line)) {
break;
}
free(*line);
}
/* record this line to readline history */
add_history(*line);
return true;
}
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