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busybox/libbb/lineedit.c
Denis Vlasenko 95fef7071e move shell/cmdedit.c -> libbb/lineedit.c
2007-01-22 09:03:42 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Termios command line History and Editing.
*
* Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
* Written by: Vladimir Oleynik <dzo@simtreas.ru>
*
* Used ideas:
* Adam Rogoyski <rogoyski@cs.utexas.edu>
* Dave Cinege <dcinege@psychosis.com>
* Jakub Jelinek (c) 1995
* Erik Andersen <andersen@codepoet.org> (Majorly adjusted for busybox)
*
* This code is 'as is' with no warranty.
*/
/*
Usage and known bugs:
Terminal key codes are not extensive, and more will probably
need to be added. This version was created on Debian GNU/Linux 2.x.
Delete, Backspace, Home, End, and the arrow keys were tested
to work in an Xterm and console. Ctrl-A also works as Home.
Ctrl-E also works as End.
Small bugs (simple effect):
- not true viewing if terminal size (x*y symbols) less
size (prompt + editor's line + 2 symbols)
- not true viewing if length prompt less terminal width
*/
#include <sys/ioctl.h>
#include "busybox.h"
/* FIXME: obsolete CONFIG item? */
#define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
#ifdef TEST
#define ENABLE_FEATURE_EDITING 0
#define ENABLE_FEATURE_TAB_COMPLETION 0
#define ENABLE_FEATURE_USERNAME_COMPLETION 0
#define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
#define ENABLE_FEATURE_CLEAN_UP 0
#endif /* TEST */
/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING
#if ENABLE_LOCALE_SUPPORT
#define Isprint(c) isprint(c)
#else
#define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
#endif
#define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
static line_input_t *state;
static struct termios initial_settings, new_settings;
static volatile unsigned cmdedit_termw = 80; /* actual terminal width */
static int cmdedit_x; /* real x terminal position */
static int cmdedit_y; /* pseudoreal y terminal position */
static int cmdedit_prmt_len; /* length of prompt (without colors etc) */
static unsigned cursor;
static unsigned command_len;
static char *command_ps;
static const char *cmdedit_prompt;
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
static char *hostname_buf;
static int num_ok_lines = 1;
#endif
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
static char *user_buf = "";
static char *home_pwd_buf = "";
#endif
#if ENABLE_FEATURE_TAB_COMPLETION
static int my_uid;
static int my_gid;
#endif
/* Put 'command_ps[cursor]', cursor++.
* Advance cursor on screen. If we reached right margin, scroll text up
* and remove terminal margin effect by printing 'next_char' */
static void cmdedit_set_out_char(int next_char)
{
int c = (unsigned char)command_ps[cursor];
if (c == '\0') {
/* erase character after end of input string */
c = ' ';
}
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Display non-printable characters in reverse */
if (!Isprint(c)) {
if (c >= 128)
c -= 128;
if (c < ' ')
c += '@';
if (c == 127)
c = '?';
printf("\033[7m%c\033[0m", c);
} else
#endif
{
if (initial_settings.c_lflag & ECHO)
putchar(c);
}
if (++cmdedit_x >= cmdedit_termw) {
/* terminal is scrolled down */
cmdedit_y++;
cmdedit_x = 0;
/* destroy "(auto)margin" */
putchar(next_char);
putchar('\b');
}
// Huh? What if command_ps[cursor] == '\0' (we are at the end already?)
cursor++;
}
/* Move to end of line (by printing all chars till the end) */
static void input_end(void)
{
while (cursor < command_len)
cmdedit_set_out_char(' ');
}
/* Go to the next line */
static void goto_new_line(void)
{
input_end();
if (cmdedit_x)
putchar('\n');
}
static void out1str(const char *s)
{
if (s)
fputs(s, stdout);
}
static void beep(void)
{
putchar('\007');
}
/* Move back one character */
/* (optimized for slow terminals) */
static void input_backward(unsigned num)
{
int count_y;
if (num > cursor)
num = cursor;
if (!num)
return;
cursor -= num;
if (cmdedit_x >= num) {
cmdedit_x -= num;
if (num <= 4) {
do putchar('\b'); while (--num);
return;
}
printf("\033[%uD", num);
return;
}
/* Need to go one or more lines up */
num -= cmdedit_x;
count_y = 1 + (num / cmdedit_termw);
cmdedit_y -= count_y;
cmdedit_x = cmdedit_termw * count_y - num;
/* go to 1st col; go up; go to correct column */
printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
}
static void put_prompt(void)
{
out1str(cmdedit_prompt);
cmdedit_x = cmdedit_prmt_len;
cursor = 0;
// Huh? what if cmdedit_prmt_len >= width?
cmdedit_y = 0; /* new quasireal y */
}
/* draw prompt, editor line, and clear tail */
static void redraw(int y, int back_cursor)
{
if (y > 0) /* up to start y */
printf("\033[%dA", y);
putchar('\r');
put_prompt();
input_end(); /* rewrite */
printf("\033[J"); /* erase after cursor */
input_backward(back_cursor);
}
#if ENABLE_FEATURE_EDITING_VI
#define DELBUFSIZ 128
static char *delbuf; /* a (malloced) place to store deleted characters */
static char *delp;
static char newdelflag; /* whether delbuf should be reused yet */
#endif
/* Delete the char in front of the cursor, optionally saving it
* for later putback */
static void input_delete(int save)
{
int j = cursor;
if (j == command_len)
return;
#if ENABLE_FEATURE_EDITING_VI
if (save) {
if (newdelflag) {
if (!delbuf)
delbuf = malloc(DELBUFSIZ);
/* safe if malloc fails */
delp = delbuf;
newdelflag = 0;
}
if (delbuf && (delp - delbuf < DELBUFSIZ))
*delp++ = command_ps[j];
}
#endif
strcpy(command_ps + j, command_ps + j + 1);
command_len--;
input_end(); /* rewrite new line */
cmdedit_set_out_char(' '); /* erase char */
input_backward(cursor - j); /* back to old pos cursor */
}
#if ENABLE_FEATURE_EDITING_VI
static void put(void)
{
int ocursor;
int j = delp - delbuf;
if (j == 0)
return;
ocursor = cursor;
/* open hole and then fill it */
memmove(command_ps + cursor + j, command_ps + cursor, command_len - cursor + 1);
strncpy(command_ps + cursor, delbuf, j);
command_len += j;
input_end(); /* rewrite new line */
input_backward(cursor - ocursor - j + 1); /* at end of new text */
}
#endif
/* Delete the char in back of the cursor */
static void input_backspace(void)
{
if (cursor > 0) {
input_backward(1);
input_delete(0);
}
}
/* Move forward one character */
static void input_forward(void)
{
if (cursor < command_len)
cmdedit_set_out_char(command_ps[cursor + 1]);
}
#if ENABLE_FEATURE_TAB_COMPLETION
static char **matches;
static unsigned num_matches;
static void free_tab_completion_data(void)
{
if (matches) {
while (num_matches)
free(matches[--num_matches]);
free(matches);
matches = NULL;
}
}
static void add_match(char *matched)
{
int nm = num_matches;
int nm1 = nm + 1;
matches = xrealloc(matches, nm1 * sizeof(char *));
matches[nm] = matched;
num_matches++;
}
#if ENABLE_FEATURE_USERNAME_COMPLETION
static void username_tab_completion(char *ud, char *with_shash_flg)
{
struct passwd *entry;
int userlen;
ud++; /* ~user/... to user/... */
userlen = strlen(ud);
if (with_shash_flg) { /* "~/..." or "~user/..." */
char *sav_ud = ud - 1;
char *home = 0;
char *temp;
if (*ud == '/') { /* "~/..." */
home = home_pwd_buf;
} else {
/* "~user/..." */
temp = strchr(ud, '/');
*temp = 0; /* ~user\0 */
entry = getpwnam(ud);
*temp = '/'; /* restore ~user/... */
ud = temp;
if (entry)
home = entry->pw_dir;
}
if (home) {
if ((userlen + strlen(home) + 1) < BUFSIZ) {
char temp2[BUFSIZ]; /* argument size */
/* /home/user/... */
sprintf(temp2, "%s%s", home, ud);
strcpy(sav_ud, temp2);
}
}
} else {
/* "~[^/]*" */
setpwent();
while ((entry = getpwent()) != NULL) {
/* Null usernames should result in all users as possible completions. */
if ( /*!userlen || */ !strncmp(ud, entry->pw_name, userlen)) {
add_match(xasprintf("~%s/", entry->pw_name));
}
}
endpwent();
}
}
#endif /* FEATURE_COMMAND_USERNAME_COMPLETION */
enum {
FIND_EXE_ONLY = 0,
FIND_DIR_ONLY = 1,
FIND_FILE_ONLY = 2,
};
static int path_parse(char ***p, int flags)
{
int npth;
const char *pth;
char *tmp;
char **res;
/* if not setenv PATH variable, to search cur dir "." */
if (flags != FIND_EXE_ONLY)
return 1;
if (state->flags & WITH_PATH_LOOKUP)
pth = state->path_lookup;
else
pth = getenv("PATH");
/* PATH=<empty> or PATH=:<empty> */
if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
return 1;
tmp = (char*)pth;
npth = 1; /* path component count */
while (1) {
tmp = strchr(tmp, ':');
if (!tmp)
break;
if (*++tmp == '\0')
break; /* :<empty> */
npth++;
}
res = xmalloc(npth * sizeof(char*));
res[0] = tmp = xstrdup(pth);
npth = 1;
while (1) {
tmp = strchr(tmp, ':');
if (!tmp)
break;
*tmp++ = '\0'; /* ':' -> '\0' */
if (*tmp == '\0')
break; /* :<empty> */
res[npth++] = tmp;
}
*p = res;
return npth;
}
static void exe_n_cwd_tab_completion(char *command, int type)
{
DIR *dir;
struct dirent *next;
char dirbuf[BUFSIZ];
struct stat st;
char *path1[1];
char **paths = path1;
int npaths;
int i;
char *found;
char *pfind = strrchr(command, '/');
npaths = 1;
path1[0] = ".";
if (pfind == NULL) {
/* no dir, if flags==EXE_ONLY - get paths, else "." */
npaths = path_parse(&paths, type);
pfind = command;
} else {
/* dirbuf = ".../.../.../" */
safe_strncpy(dirbuf, command, (pfind - command) + 2);
#if ENABLE_FEATURE_USERNAME_COMPLETION
if (dirbuf[0] == '~') /* ~/... or ~user/... */
username_tab_completion(dirbuf, dirbuf);
#endif
paths[0] = dirbuf;
/* point to 'l' in "..../last_component" */
pfind++;
}
for (i = 0; i < npaths; i++) {
dir = opendir(paths[i]);
if (!dir) /* Don't print an error */
continue;
while ((next = readdir(dir)) != NULL) {
int len1;
char *str_found = next->d_name;
/* matched? */
if (strncmp(str_found, pfind, strlen(pfind)))
continue;
/* not see .name without .match */
if (*str_found == '.' && *pfind == 0) {
if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
continue;
str_found = ""; /* only "/" */
}
found = concat_path_file(paths[i], str_found);
/* hmm, remover in progress? */
if (stat(found, &st) < 0)
goto cont;
/* find with dirs? */
if (paths[i] != dirbuf)
strcpy(found, next->d_name); /* only name */
len1 = strlen(found);
found = xrealloc(found, len1 + 2);
found[len1] = '\0';
found[len1+1] = '\0';
if (S_ISDIR(st.st_mode)) {
/* name is directory */
if (found[len1-1] != '/') {
found[len1] = '/';
}
} else {
/* not put found file if search only dirs for cd */
if (type == FIND_DIR_ONLY)
goto cont;
}
/* Add it to the list */
add_match(found);
continue;
cont:
free(found);
}
closedir(dir);
}
if (paths != path1) {
free(paths[0]); /* allocated memory only in first member */
free(paths);
}
}
#define QUOT (UCHAR_MAX+1)
#define collapse_pos(is, in) { \
memmove(int_buf+(is), int_buf+(in), (BUFSIZ+1-(is)-(in))*sizeof(int)); \
memmove(pos_buf+(is), pos_buf+(in), (BUFSIZ+1-(is)-(in))*sizeof(int)); }
static int find_match(char *matchBuf, int *len_with_quotes)
{
int i, j;
int command_mode;
int c, c2;
int int_buf[BUFSIZ + 1];
int pos_buf[BUFSIZ + 1];
/* set to integer dimension characters and own positions */
for (i = 0;; i++) {
int_buf[i] = (unsigned char)matchBuf[i];
if (int_buf[i] == 0) {
pos_buf[i] = -1; /* indicator end line */
break;
}
pos_buf[i] = i;
}
/* mask \+symbol and convert '\t' to ' ' */
for (i = j = 0; matchBuf[i]; i++, j++)
if (matchBuf[i] == '\\') {
collapse_pos(j, j + 1);
int_buf[j] |= QUOT;
i++;
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
if (matchBuf[i] == '\t') /* algorithm equivalent */
int_buf[j] = ' ' | QUOT;
#endif
}
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
else if (matchBuf[i] == '\t')
int_buf[j] = ' ';
#endif
/* mask "symbols" or 'symbols' */
c2 = 0;
for (i = 0; int_buf[i]; i++) {
c = int_buf[i];
if (c == '\'' || c == '"') {
if (c2 == 0)
c2 = c;
else {
if (c == c2)
c2 = 0;
else
int_buf[i] |= QUOT;
}
} else if (c2 != 0 && c != '$')
int_buf[i] |= QUOT;
}
/* skip commands with arguments if line has commands delimiters */
/* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
for (i = 0; int_buf[i]; i++) {
c = int_buf[i];
c2 = int_buf[i + 1];
j = i ? int_buf[i - 1] : -1;
command_mode = 0;
if (c == ';' || c == '&' || c == '|') {
command_mode = 1 + (c == c2);
if (c == '&') {
if (j == '>' || j == '<')
command_mode = 0;
} else if (c == '|' && j == '>')
command_mode = 0;
}
if (command_mode) {
collapse_pos(0, i + command_mode);
i = -1; /* hack incremet */
}
}
/* collapse `command...` */
for (i = 0; int_buf[i]; i++)
if (int_buf[i] == '`') {
for (j = i + 1; int_buf[j]; j++)
if (int_buf[j] == '`') {
collapse_pos(i, j + 1);
j = 0;
break;
}
if (j) {
/* not found close ` - command mode, collapse all previous */
collapse_pos(0, i + 1);
break;
} else
i--; /* hack incremet */
}
/* collapse (command...(command...)...) or {command...{command...}...} */
c = 0; /* "recursive" level */
c2 = 0;
for (i = 0; int_buf[i]; i++)
if (int_buf[i] == '(' || int_buf[i] == '{') {
if (int_buf[i] == '(')
c++;
else
c2++;
collapse_pos(0, i + 1);
i = -1; /* hack incremet */
}
for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
if (int_buf[i] == ')')
c--;
else
c2--;
collapse_pos(0, i + 1);
i = -1; /* hack incremet */
}
/* skip first not quote space */
for (i = 0; int_buf[i]; i++)
if (int_buf[i] != ' ')
break;
if (i)
collapse_pos(0, i);
/* set find mode for completion */
command_mode = FIND_EXE_ONLY;
for (i = 0; int_buf[i]; i++)
if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
&& matchBuf[pos_buf[0]]=='c'
&& matchBuf[pos_buf[1]]=='d'
) {
command_mode = FIND_DIR_ONLY;
} else {
command_mode = FIND_FILE_ONLY;
break;
}
}
for (i = 0; int_buf[i]; i++)
/* "strlen" */;
/* find last word */
for (--i; i >= 0; i--) {
c = int_buf[i];
if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
collapse_pos(0, i + 1);
break;
}
}
/* skip first not quoted '\'' or '"' */
for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
/*skip*/;
/* collapse quote or unquote // or /~ */
while ((int_buf[i] & ~QUOT) == '/'
&& ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
) {
i++;
}
/* set only match and destroy quotes */
j = 0;
for (c = 0; pos_buf[i] >= 0; i++) {
matchBuf[c++] = matchBuf[pos_buf[i]];
j = pos_buf[i] + 1;
}
matchBuf[c] = 0;
/* old lenght matchBuf with quotes symbols */
*len_with_quotes = j ? j - pos_buf[0] : 0;
return command_mode;
}
/*
* display by column (original idea from ls applet,
* very optimized by me :)
*/
static void showfiles(void)
{
int ncols, row;
int column_width = 0;
int nfiles = num_matches;
int nrows = nfiles;
int l;
/* find the longest file name- use that as the column width */
for (row = 0; row < nrows; row++) {
l = strlen(matches[row]);
if (column_width < l)
column_width = l;
}
column_width += 2; /* min space for columns */
ncols = cmdedit_termw / column_width;
if (ncols > 1) {
nrows /= ncols;
if (nfiles % ncols)
nrows++; /* round up fractionals */
} else {
ncols = 1;
}
for (row = 0; row < nrows; row++) {
int n = row;
int nc;
for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
printf("%s%-*s", matches[n],
(int)(column_width - strlen(matches[n])), "");
}
printf("%s\n", matches[n]);
}
}
static char *add_quote_for_spec_chars(char *found)
{
int l = 0;
char *s = xmalloc((strlen(found) + 1) * 2);
while (*found) {
if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
s[l++] = '\\';
s[l++] = *found++;
}
s[l] = 0;
return s;
}
static int match_compare(const void *a, const void *b)
{
return strcmp(*(char**)a, *(char**)b);
}
/* Do TAB completion */
static void input_tab(int *lastWasTab)
{
if (!(state->flags & TAB_COMPLETION))
return;
if (!*lastWasTab) {
char *tmp, *tmp1;
int len_found;
char matchBuf[BUFSIZ];
int find_type;
int recalc_pos;
*lastWasTab = TRUE; /* flop trigger */
/* Make a local copy of the string -- up
* to the position of the cursor */
tmp = strncpy(matchBuf, command_ps, cursor);
tmp[cursor] = '\0';
find_type = find_match(matchBuf, &recalc_pos);
/* Free up any memory already allocated */
free_tab_completion_data();
#if ENABLE_FEATURE_USERNAME_COMPLETION
/* If the word starts with `~' and there is no slash in the word,
* then try completing this word as a username. */
if (state->flags & USERNAME_COMPLETION)
if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
username_tab_completion(matchBuf, NULL);
#endif
/* Try to match any executable in our path and everything
* in the current working directory */
if (!matches)
exe_n_cwd_tab_completion(matchBuf, find_type);
/* Sort, then remove any duplicates found */
if (matches) {
int i, n = 0;
qsort(matches, num_matches, sizeof(char*), match_compare);
for (i = 0; i < num_matches - 1; ++i) {
if (matches[i] && matches[i+1]) { /* paranoia */
if (strcmp(matches[i], matches[i+1]) == 0) {
free(matches[i]);
matches[i] = NULL; /* paranoia */
} else {
matches[n++] = matches[i];
}
}
}
matches[n] = matches[i];
num_matches = n + 1;
}
/* Did we find exactly one match? */
if (!matches || num_matches > 1) {
beep();
if (!matches)
return; /* not found */
/* find minimal match */
tmp1 = xstrdup(matches[0]);
for (tmp = tmp1; *tmp; tmp++)
for (len_found = 1; len_found < num_matches; len_found++)
if (matches[len_found][(tmp - tmp1)] != *tmp) {
*tmp = '\0';
break;
}
if (*tmp1 == '\0') { /* have unique */
free(tmp1);
return;
}
tmp = add_quote_for_spec_chars(tmp1);
free(tmp1);
} else { /* one match */
tmp = add_quote_for_spec_chars(matches[0]);
/* for next completion current found */
*lastWasTab = FALSE;
len_found = strlen(tmp);
if (tmp[len_found-1] != '/') {
tmp[len_found] = ' ';
tmp[len_found+1] = '\0';
}
}
len_found = strlen(tmp);
/* have space to placed match? */
if ((len_found - strlen(matchBuf) + command_len) < BUFSIZ) {
/* before word for match */
command_ps[cursor - recalc_pos] = 0;
/* save tail line */
strcpy(matchBuf, command_ps + cursor);
/* add match */
strcat(command_ps, tmp);
/* add tail */
strcat(command_ps, matchBuf);
/* back to begin word for match */
input_backward(recalc_pos);
/* new pos */
recalc_pos = cursor + len_found;
/* new len */
command_len = strlen(command_ps);
/* write out the matched command */
redraw(cmdedit_y, command_len - recalc_pos);
}
free(tmp);
} else {
/* Ok -- the last char was a TAB. Since they
* just hit TAB again, print a list of all the
* available choices... */
if (matches && num_matches > 0) {
int sav_cursor = cursor; /* change goto_new_line() */
/* Go to the next line */
goto_new_line();
showfiles();
redraw(0, command_len - sav_cursor);
}
}
}
#else
#define input_tab(a) ((void)0)
#endif /* FEATURE_COMMAND_TAB_COMPLETION */
#if MAX_HISTORY > 0
/* state->flags is already checked to be nonzero */
static void get_previous_history(void)
{
if (command_ps[0] != '\0' || state->history[state->cur_history] == NULL) {
free(state->history[state->cur_history]);
state->history[state->cur_history] = xstrdup(command_ps);
}
state->cur_history--;
}
static int get_next_history(void)
{
if (state->flags & DO_HISTORY) {
int ch = state->cur_history;
if (ch < state->cnt_history) {
get_previous_history(); /* save the current history line */
state->cur_history = ch + 1;
return state->cur_history;
}
}
beep();
return 0;
}
#if ENABLE_FEATURE_EDITING_SAVEHISTORY
/* state->flags is already checked to be nonzero */
void load_history(const char *fromfile)
{
FILE *fp;
int hi;
/* cleanup old */
for (hi = state->cnt_history; hi > 0;) {
hi--;
free(state->history[hi]);
}
fp = fopen(fromfile, "r");
if (fp) {
for (hi = 0; hi < MAX_HISTORY;) {
char * hl = xmalloc_getline(fp);
int l;
if (!hl)
break;
l = strlen(hl);
if (l >= BUFSIZ)
hl[BUFSIZ-1] = 0;
if (l == 0 || hl[0] == ' ') {
free(hl);
continue;
}
state->history[hi++] = hl;
}
fclose(fp);
}
state->cur_history = state->cnt_history = hi;
}
/* state->flags is already checked to be nonzero */
void save_history(const char *tofile)
{
FILE *fp;
fp = fopen(tofile, "w");
if (fp) {
int i;
for (i = 0; i < state->cnt_history; i++) {
fprintf(fp, "%s\n", state->history[i]);
}
fclose(fp);
}
}
#else
#define load_history(a) ((void)0)
#define save_history(a) ((void)0)
#endif /* FEATURE_COMMAND_SAVEHISTORY */
static void remember_in_history(const char *str)
{
int i;
if (!(state->flags & DO_HISTORY))
return;
i = state->cnt_history;
free(state->history[MAX_HISTORY]);
state->history[MAX_HISTORY] = NULL;
/* After max history, remove the oldest command */
if (i >= MAX_HISTORY) {
free(state->history[0]);
for (i = 0; i < MAX_HISTORY-1; i++)
state->history[i] = state->history[i+1];
}
// Maybe "if (!i || strcmp(history[i-1], command) != 0) ..."
// (i.e. do not save dups?)
state->history[i++] = xstrdup(str);
state->cur_history = i;
state->cnt_history = i;
if (state->flags & SAVE_HISTORY)
save_history(state->hist_file);
USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
}
#else /* MAX_HISTORY == 0 */
#define remember_in_history(a) ((void)0)
#endif /* MAX_HISTORY */
/*
* This function is used to grab a character buffer
* from the input file descriptor and allows you to
* a string with full command editing (sort of like
* a mini readline).
*
* The following standard commands are not implemented:
* ESC-b -- Move back one word
* ESC-f -- Move forward one word
* ESC-d -- Delete back one word
* ESC-h -- Delete forward one word
* CTL-t -- Transpose two characters
*
* Minimalist vi-style command line editing available if configured.
* vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
*/
#if ENABLE_FEATURE_EDITING_VI
static void
vi_Word_motion(char *command, int eat)
{
while (cursor < command_len && !isspace(command[cursor]))
input_forward();
if (eat) while (cursor < command_len && isspace(command[cursor]))
input_forward();
}
static void
vi_word_motion(char *command, int eat)
{
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len
&& (isalnum(command[cursor+1]) || command[cursor+1] == '_'))
input_forward();
} else if (ispunct(command[cursor])) {
while (cursor < command_len && ispunct(command[cursor+1]))
input_forward();
}
if (cursor < command_len)
input_forward();
if (eat && cursor < command_len && isspace(command[cursor]))
while (cursor < command_len && isspace(command[cursor]))
input_forward();
}
static void
vi_End_motion(char *command)
{
input_forward();
while (cursor < command_len && isspace(command[cursor]))
input_forward();
while (cursor < command_len-1 && !isspace(command[cursor+1]))
input_forward();
}
static void
vi_end_motion(char *command)
{
if (cursor >= command_len-1)
return;
input_forward();
while (cursor < command_len-1 && isspace(command[cursor]))
input_forward();
if (cursor >= command_len-1)
return;
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor < command_len-1
&& (isalnum(command[cursor+1]) || command[cursor+1] == '_')
) {
input_forward();
}
} else if (ispunct(command[cursor])) {
while (cursor < command_len-1 && ispunct(command[cursor+1]))
input_forward();
}
}
static void
vi_Back_motion(char *command)
{
while (cursor > 0 && isspace(command[cursor-1]))
input_backward(1);
while (cursor > 0 && !isspace(command[cursor-1]))
input_backward(1);
}
static void
vi_back_motion(char *command)
{
if (cursor <= 0)
return;
input_backward(1);
while (cursor > 0 && isspace(command[cursor]))
input_backward(1);
if (cursor <= 0)
return;
if (isalnum(command[cursor]) || command[cursor] == '_') {
while (cursor > 0
&& (isalnum(command[cursor-1]) || command[cursor-1] == '_')
) {
input_backward(1);
}
} else if (ispunct(command[cursor])) {
while (cursor > 0 && ispunct(command[cursor-1]))
input_backward(1);
}
}
#endif
/*
* read_line_input and its helpers
*/
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_prompt(const char *prmt_ptr)
{
cmdedit_prompt = prmt_ptr;
cmdedit_prmt_len = strlen(prmt_ptr);
put_prompt();
}
#else
static void parse_prompt(const char *prmt_ptr)
{
int prmt_len = 0;
size_t cur_prmt_len = 0;
char flg_not_length = '[';
char *prmt_mem_ptr = xzalloc(1);
char *pwd_buf = xgetcwd(0);
char buf2[PATH_MAX + 1];
char buf[2];
char c;
char *pbuf;
cmdedit_prmt_len = 0;
if (!pwd_buf) {
pwd_buf = (char *)bb_msg_unknown;
}
while (*prmt_ptr) {
pbuf = buf;
pbuf[1] = 0;
c = *prmt_ptr++;
if (c == '\\') {
const char *cp = prmt_ptr;
int l;
c = bb_process_escape_sequence(&prmt_ptr);
if (prmt_ptr == cp) {
if (*cp == 0)
break;
c = *prmt_ptr++;
switch (c) {
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
case 'u':
pbuf = user_buf;
break;
#endif
case 'h':
pbuf = hostname_buf;
if (!pbuf) {
pbuf = xzalloc(256);
if (gethostname(pbuf, 255) < 0) {
strcpy(pbuf, "?");
} else {
char *s = strchr(pbuf, '.');
if (s)
*s = '\0';
}
hostname_buf = pbuf;
}
break;
case '$':
c = (geteuid() == 0 ? '#' : '$');
break;
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
case 'w':
pbuf = pwd_buf;
l = strlen(home_pwd_buf);
if (home_pwd_buf[0] != 0
&& strncmp(home_pwd_buf, pbuf, l) == 0
&& (pbuf[l]=='/' || pbuf[l]=='\0')
&& strlen(pwd_buf+l)<PATH_MAX
) {
pbuf = buf2;
*pbuf = '~';
strcpy(pbuf+1, pwd_buf+l);
}
break;
#endif
case 'W':
pbuf = pwd_buf;
cp = strrchr(pbuf,'/');
if (cp != NULL && cp != pbuf)
pbuf += (cp-pbuf) + 1;
break;
case '!':
pbuf = buf2;
snprintf(buf2, sizeof(buf2), "%d", num_ok_lines);
break;
case 'e': case 'E': /* \e \E = \033 */
c = '\033';
break;
case 'x': case 'X':
for (l = 0; l < 3;) {
int h;
buf2[l++] = *prmt_ptr;
buf2[l] = 0;
h = strtol(buf2, &pbuf, 16);
if (h > UCHAR_MAX || (pbuf - buf2) < l) {
l--;
break;
}
prmt_ptr++;
}
buf2[l] = 0;
c = (char)strtol(buf2, NULL, 16);
if (c == 0)
c = '?';
pbuf = buf;
break;
case '[': case ']':
if (c == flg_not_length) {
flg_not_length = flg_not_length == '[' ? ']' : '[';
continue;
}
break;
}
}
}
if (pbuf == buf)
*pbuf = c;
cur_prmt_len = strlen(pbuf);
prmt_len += cur_prmt_len;
if (flg_not_length != ']')
cmdedit_prmt_len += cur_prmt_len;
prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
}
if (pwd_buf != (char *)bb_msg_unknown)
free(pwd_buf);
cmdedit_prompt = prmt_mem_ptr;
put_prompt();
}
#endif
#define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
#define getTermSettings(fd, argp) tcgetattr(fd, argp);
static sighandler_t previous_SIGWINCH_handler;
static void cmdedit_setwidth(unsigned w, int redraw_flg)
{
cmdedit_termw = w;
if (redraw_flg) {
/* new y for current cursor */
int new_y = (cursor + cmdedit_prmt_len) / w;
/* redraw */
redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
fflush(stdout);
}
}
static void win_changed(int nsig)
{
int width;
get_terminal_width_height(0, &width, NULL);
cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
if (nsig == SIGWINCH)
signal(SIGWINCH, win_changed); /* rearm ourself */
}
/*
* The emacs and vi modes share much of the code in the big
* command loop. Commands entered when in vi's command mode (aka
* "escape mode") get an extra bit added to distinguish them --
* this keeps them from being self-inserted. This clutters the
* big switch a bit, but keeps all the code in one place.
*/
#define vbit 0x100
/* leave out the "vi-mode"-only case labels if vi editing isn't
* configured. */
#define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel)
/* convert uppercase ascii to equivalent control char, for readability */
#undef CTRL
#define CTRL(a) ((a) & ~0x40)
int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *st)
{
static const int null_flags;
int lastWasTab = FALSE;
unsigned int ic;
unsigned char c;
smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
smallint vi_cmdmode = 0;
smalluint prevc;
#endif
// FIXME: audit & improve this
if (maxsize > BUFSIZ)
maxsize = BUFSIZ;
/* With null flags, no other fields are ever used */
state = st ? st : (line_input_t*) &null_flags;
if (state->flags & SAVE_HISTORY)
load_history(state->hist_file);
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
command_len = 0;
command_ps = command;
command[0] = '\0';
getTermSettings(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(new_settings));
new_settings.c_lflag &= ~ICANON; /* unbuffered input */
/* Turn off echoing and CTRL-C, so we can trap it */
new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
/* Hmm, in linux c_cc[] is not parsed if ICANON is off */
new_settings.c_cc[VMIN] = 1;
new_settings.c_cc[VTIME] = 0;
/* Turn off CTRL-C, so we can trap it */
#ifndef _POSIX_VDISABLE
#define _POSIX_VDISABLE '\0'
#endif
new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
setTermSettings(0, (void *) &new_settings);
/* Now initialize things */
previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
win_changed(0); /* do initial resizing */
#if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
{
struct passwd *entry;
entry = getpwuid(geteuid());
if (entry) {
user_buf = xstrdup(entry->pw_name);
home_pwd_buf = xstrdup(entry->pw_dir);
}
}
#endif
#if ENABLE_FEATURE_TAB_COMPLETION
my_uid = getuid();
my_gid = getgid();
#endif
/* Print out the command prompt */
parse_prompt(prompt);
while (1) {
fflush(stdout);
if (safe_read(0, &c, 1) < 1) {
/* if we can't read input then exit */
goto prepare_to_die;
}
ic = c;
#if ENABLE_FEATURE_EDITING_VI
newdelflag = 1;
if (vi_cmdmode)
ic |= vbit;
#endif
switch (ic) {
case '\n':
case '\r':
vi_case('\n'|vbit:)
vi_case('\r'|vbit:)
/* Enter */
goto_new_line();
break_out = 1;
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('A'):
vi_case('0'|vbit:)
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
case CTRL('B'):
vi_case('h'|vbit:)
vi_case('\b'|vbit:)
vi_case('\x7f'|vbit:) /* DEL */
/* Control-b -- Move back one character */
input_backward(1);
break;
#endif
case CTRL('C'):
vi_case(CTRL('C')|vbit:)
/* Control-c -- stop gathering input */
goto_new_line();
command_len = 0;
break_out = -1; /* "do not append '\n'" */
break;
case CTRL('D'):
/* Control-d -- Delete one character, or exit
* if the len=0 and no chars to delete */
if (command_len == 0) {
errno = 0;
prepare_to_die:
/* to control stopped jobs */
break_out = command_len = -1;
break;
}
input_delete(0);
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('E'):
vi_case('$'|vbit:)
/* Control-e -- End of line */
input_end();
break;
case CTRL('F'):
vi_case('l'|vbit:)
vi_case(' '|vbit:)
/* Control-f -- Move forward one character */
input_forward();
break;
#endif
case '\b':
case '\x7f': /* DEL */
/* Control-h and DEL */
input_backspace();
break;
case '\t':
input_tab(&lastWasTab);
break;
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('K'):
/* Control-k -- clear to end of line */
command[cursor] = 0;
command_len = cursor;
printf("\033[J");
break;
case CTRL('L'):
vi_case(CTRL('L')|vbit:)
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, command_len - cursor);
break;
#endif
#if MAX_HISTORY > 0
case CTRL('N'):
vi_case(CTRL('N')|vbit:)
vi_case('j'|vbit:)
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
case CTRL('P'):
vi_case(CTRL('P')|vbit:)
vi_case('k'|vbit:)
/* Control-p -- Get previous command from history */
if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
get_previous_history();
goto rewrite_line;
}
beep();
break;
#endif
#if ENABLE_FEATURE_EDITING_FANCY_KEYS
case CTRL('U'):
vi_case(CTRL('U')|vbit:)
/* Control-U -- Clear line before cursor */
if (cursor) {
strcpy(command, command + cursor);
command_len -= cursor;
redraw(cmdedit_y, command_len);
}
break;
#endif
case CTRL('W'):
vi_case(CTRL('W')|vbit:)
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
while (cursor > 0 && !isspace(command[cursor-1]))
input_backspace();
break;
#if ENABLE_FEATURE_EDITING_VI
case 'i'|vbit:
vi_cmdmode = 0;
break;
case 'I'|vbit:
input_backward(cursor);
vi_cmdmode = 0;
break;
case 'a'|vbit:
input_forward();
vi_cmdmode = 0;
break;
case 'A'|vbit:
input_end();
vi_cmdmode = 0;
break;
case 'x'|vbit:
input_delete(1);
break;
case 'X'|vbit:
if (cursor > 0) {
input_backward(1);
input_delete(1);
}
break;
case 'W'|vbit:
vi_Word_motion(command, 1);
break;
case 'w'|vbit:
vi_word_motion(command, 1);
break;
case 'E'|vbit:
vi_End_motion(command);
break;
case 'e'|vbit:
vi_end_motion(command);
break;
case 'B'|vbit:
vi_Back_motion(command);
break;
case 'b'|vbit:
vi_back_motion(command);
break;
case 'C'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'D'|vbit:
goto clear_to_eol;
case 'c'|vbit:
vi_cmdmode = 0;
/* fall through */
case 'd'|vbit: {
int nc, sc;
sc = cursor;
prevc = ic;
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == (prevc & 0xff)) {
/* "cc", "dd" */
input_backward(cursor);
goto clear_to_eol;
break;
}
switch (c) {
case 'w':
case 'W':
case 'e':
case 'E':
switch (c) {
case 'w': /* "dw", "cw" */
vi_word_motion(command, vi_cmdmode);
break;
case 'W': /* 'dW', 'cW' */
vi_Word_motion(command, vi_cmdmode);
break;
case 'e': /* 'de', 'ce' */
vi_end_motion(command);
input_forward();
break;
case 'E': /* 'dE', 'cE' */
vi_End_motion(command);
input_forward();
break;
}
nc = cursor;
input_backward(cursor - sc);
while (nc-- > cursor)
input_delete(1);
break;
case 'b': /* "db", "cb" */
case 'B': /* implemented as B */
if (c == 'b')
vi_back_motion(command);
else
vi_Back_motion(command);
while (sc-- > cursor)
input_delete(1);
break;
case ' ': /* "d ", "c " */
input_delete(1);
break;
case '$': /* "d$", "c$" */
clear_to_eol:
while (cursor < command_len)
input_delete(1);
break;
}
break;
}
case 'p'|vbit:
input_forward();
/* fallthrough */
case 'P'|vbit:
put();
break;
case 'r'|vbit:
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0)
beep();
else {
*(command + cursor) = c;
putchar(c);
putchar('\b');
}
break;
#endif /* FEATURE_COMMAND_EDITING_VI */
case '\x1b': /* ESC */
#if ENABLE_FEATURE_EDITING_VI
if (state->flags & VI_MODE) {
/* ESC: insert mode --> command mode */
vi_cmdmode = 1;
input_backward(1);
break;
}
#endif
/* escape sequence follows */
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
vi_case('['|vbit:)
vi_case('O'|vbit:)
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
}
if (c >= '1' && c <= '9') {
unsigned char dummy;
if (safe_read(0, &dummy, 1) < 1)
goto prepare_to_die;
if (dummy != '~')
c = '\0';
}
switch (c) {
#if ENABLE_FEATURE_TAB_COMPLETION
case '\t': /* Alt-Tab */
input_tab(&lastWasTab);
break;
#endif
#if MAX_HISTORY > 0
case 'A':
/* Up Arrow -- Get previous command from history */
if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
get_previous_history();
goto rewrite_line;
}
beep();
break;
case 'B':
/* Down Arrow -- Get next command in history */
if (!get_next_history())
break;
rewrite_line:
/* Rewrite the line with the selected history item */
/* change command */
command_len = strlen(strcpy(command, state->history[state->cur_history]));
/* redraw and go to eol (bol, in vi */
redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
break;
#endif
case 'C':
/* Right Arrow -- Move forward one character */
input_forward();
break;
case 'D':
/* Left Arrow -- Move back one character */
input_backward(1);
break;
case '3':
/* Delete */
input_delete(0);
break;
case '1':
case 'H':
/* <Home> */
input_backward(cursor);
break;
case '4':
case 'F':
/* <End> */
input_end();
break;
default:
c = '\0';
beep();
}
break;
default: /* If it's regular input, do the normal thing */
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Control-V -- Add non-printable symbol */
if (c == CTRL('V')) {
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0) {
beep();
break;
}
} else
#endif
#if ENABLE_FEATURE_EDITING_VI
if (vi_cmdmode) /* Don't self-insert */
break;
#endif
if (!Isprint(c)) /* Skip non-printable characters */
break;
if (command_len >= (maxsize - 2)) /* Need to leave space for enter */
break;
command_len++;
if (cursor == (command_len - 1)) { /* Append if at the end of the line */
command[cursor] = c;
command[cursor+1] = '\0';
cmdedit_set_out_char(' ');
} else { /* Insert otherwise */
int sc = cursor;
memmove(command + sc + 1, command + sc, command_len - sc);
command[sc] = c;
sc++;
/* rewrite from cursor */
input_end();
/* to prev x pos + 1 */
input_backward(cursor - sc);
}
break;
}
if (break_out) /* Enter is the command terminator, no more input. */
break;
if (c != '\t')
lastWasTab = FALSE;
}
if (command_len > 0)
remember_in_history(command);
if (break_out > 0) {
command[command_len++] = '\n';
command[command_len] = '\0';
}
#if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_TAB_COMPLETION
free_tab_completion_data();
#endif
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
free((char*)cmdedit_prompt);
#endif
/* restore initial_settings */
setTermSettings(STDIN_FILENO, (void *) &initial_settings);
/* restore SIGWINCH handler */
signal(SIGWINCH, previous_SIGWINCH_handler);
fflush(stdout);
return command_len;
}
line_input_t *new_line_input_t(int flags)
{
line_input_t *n = xzalloc(sizeof(*n));
n->flags = flags;
return n;
}
#else
#undef read_line_input
int read_line_input(const char* prompt, char* command, int maxsize)
{
fputs(prompt, stdout);
fflush(stdout);
fgets(command, maxsize, stdin);
return strlen(command);
}
#endif /* FEATURE_COMMAND_EDITING */
/*
* Testing
*/
#ifdef TEST
#include <locale.h>
const char *applet_name = "debug stuff usage";
int main(int argc, char **argv)
{
char buff[BUFSIZ];
char *prompt =
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
"\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
"\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
"\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
#else
"% ";
#endif
#if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
setlocale(LC_ALL, "");
#endif
while (1) {
int l;
l = read_line_input(prompt, buff);
if (l <= 0 || buff[l-1] != '\n')
break;
buff[l-1] = 0;
printf("*** read_line_input() returned line =%s=\n", buff);
}
printf("*** read_line_input() detect ^D\n");
return 0;
}
#endif /* TEST */
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