[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/libbb/lineedit.c b/ap/app/busybox/src/libbb/lineedit.c
new file mode 100755
index 0000000..61fe006
--- /dev/null
+++ b/ap/app/busybox/src/libbb/lineedit.c
@@ -0,0 +1,2787 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Command line 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, more needs 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.
+ *
+ * The following readline-like commands are not implemented:
+ * ESC-b -- Move back one word
+ * ESC-f -- Move forward one word
+ * ESC-d -- Delete forward one word
+ * CTL-t -- Transpose two characters
+ *
+ * lineedit does not know that the terminal escape sequences do not
+ * take up space on the screen. The redisplay code assumes, unless
+ * told otherwise, that each character in the prompt is a printable
+ * character that takes up one character position on the screen.
+ * You need to tell lineedit that some sequences of characters
+ * in the prompt take up no screen space. Compatibly with readline,
+ * use the \[ escape to begin a sequence of non-printing characters,
+ * and the \] escape to signal the end of such a sequence. Example:
+ *
+ * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
+ */
+#include "libbb.h"
+#include "unicode.h"
+#ifndef _POSIX_VDISABLE
+# define _POSIX_VDISABLE '\0'
+#endif
+
+
+#ifdef TEST
+# define ENABLE_FEATURE_EDITING 0
+# define ENABLE_FEATURE_TAB_COMPLETION 0
+# define ENABLE_FEATURE_USERNAME_COMPLETION 0
+#endif
+
+
+/* Entire file (except TESTing part) sits inside this #if */
+#if ENABLE_FEATURE_EDITING
+
+
+#define ENABLE_USERNAME_OR_HOMEDIR \
+ (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
+#define IF_USERNAME_OR_HOMEDIR(...)
+#if ENABLE_USERNAME_OR_HOMEDIR
+# undef IF_USERNAME_OR_HOMEDIR
+# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
+#endif
+
+
+#undef CHAR_T
+#if ENABLE_UNICODE_SUPPORT
+# define BB_NUL ((wchar_t)0)
+# define CHAR_T wchar_t
+static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
+# if ENABLE_FEATURE_EDITING_VI
+static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
+# endif
+static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
+# undef isspace
+# undef isalnum
+# undef ispunct
+# undef isprint
+# define isspace isspace_must_not_be_used
+# define isalnum isalnum_must_not_be_used
+# define ispunct ispunct_must_not_be_used
+# define isprint isprint_must_not_be_used
+#else
+# define BB_NUL '\0'
+# define CHAR_T char
+# define BB_isspace(c) isspace(c)
+# define BB_isalnum(c) isalnum(c)
+# define BB_ispunct(c) ispunct(c)
+#endif
+#if ENABLE_UNICODE_PRESERVE_BROKEN
+# define unicode_mark_raw_byte(wc) ((wc) | 0x20000000)
+# define unicode_is_raw_byte(wc) ((wc) & 0x20000000)
+#else
+# define unicode_is_raw_byte(wc) 0
+#endif
+
+
+#define ESC "\033"
+
+#define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
+//#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
+
+
+enum {
+ MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
+ ? CONFIG_FEATURE_EDITING_MAX_LEN
+ : 0x7ff0
+};
+
+#if ENABLE_USERNAME_OR_HOMEDIR
+static const char null_str[] ALIGN1 = "";
+#endif
+
+/* We try to minimize both static and stack usage. */
+struct lineedit_statics {
+ line_input_t *state;
+
+ volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
+ sighandler_t previous_SIGWINCH_handler;
+
+ unsigned cmdedit_x; /* real x (col) terminal position */
+ unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
+ unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
+
+ unsigned cursor;
+ int command_len; /* must be signed */
+ /* signed maxsize: we want x in "if (x > S.maxsize)"
+ * to _not_ be promoted to unsigned */
+ int maxsize;
+ CHAR_T *command_ps;
+
+ const char *cmdedit_prompt;
+#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ int num_ok_lines; /* = 1; */
+#endif
+
+#if ENABLE_USERNAME_OR_HOMEDIR
+ char *user_buf;
+ char *home_pwd_buf; /* = (char*)null_str; */
+#endif
+
+#if ENABLE_FEATURE_TAB_COMPLETION
+ char **matches;
+ unsigned num_matches;
+#endif
+
+#if ENABLE_FEATURE_EDITING_VI
+# define DELBUFSIZ 128
+ CHAR_T *delptr;
+ smallint newdelflag; /* whether delbuf should be reused yet */
+ CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
+#endif
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ smallint sent_ESC_br6n;
+#endif
+};
+
+/* See lineedit_ptr_hack.c */
+extern struct lineedit_statics *const lineedit_ptr_to_statics;
+
+#define S (*lineedit_ptr_to_statics)
+#define state (S.state )
+#define cmdedit_termw (S.cmdedit_termw )
+#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
+#define cmdedit_x (S.cmdedit_x )
+#define cmdedit_y (S.cmdedit_y )
+#define cmdedit_prmt_len (S.cmdedit_prmt_len)
+#define cursor (S.cursor )
+#define command_len (S.command_len )
+#define command_ps (S.command_ps )
+#define cmdedit_prompt (S.cmdedit_prompt )
+#define num_ok_lines (S.num_ok_lines )
+#define user_buf (S.user_buf )
+#define home_pwd_buf (S.home_pwd_buf )
+#define matches (S.matches )
+#define num_matches (S.num_matches )
+#define delptr (S.delptr )
+#define newdelflag (S.newdelflag )
+#define delbuf (S.delbuf )
+
+#define INIT_S() do { \
+ (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
+ barrier(); \
+ cmdedit_termw = 80; \
+ IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
+ IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
+} while (0)
+
+static void deinit_S(void)
+{
+#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ /* This one is allocated only if FANCY_PROMPT is on
+ * (otherwise it points to verbatim prompt (NOT malloced)) */
+ free((char*)cmdedit_prompt);
+#endif
+#if ENABLE_USERNAME_OR_HOMEDIR
+ free(user_buf);
+ if (home_pwd_buf != null_str)
+ free(home_pwd_buf);
+#endif
+ free(lineedit_ptr_to_statics);
+}
+#define DEINIT_S() deinit_S()
+
+
+#if ENABLE_UNICODE_SUPPORT
+static size_t load_string(const char *src)
+{
+ if (unicode_status == UNICODE_ON) {
+ ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
+ if (len < 0)
+ len = 0;
+ command_ps[len] = BB_NUL;
+ return len;
+ } else {
+ unsigned i = 0;
+ while (src[i] && i < S.maxsize - 1) {
+ command_ps[i] = src[i];
+ i++;
+ }
+ command_ps[i] = BB_NUL;
+ return i;
+ }
+}
+static unsigned save_string(char *dst, unsigned maxsize)
+{
+ if (unicode_status == UNICODE_ON) {
+# if !ENABLE_UNICODE_PRESERVE_BROKEN
+ ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
+ if (len < 0)
+ len = 0;
+ dst[len] = '\0';
+ return len;
+# else
+ unsigned dstpos = 0;
+ unsigned srcpos = 0;
+
+ maxsize--;
+ while (dstpos < maxsize) {
+ wchar_t wc;
+ int n = srcpos;
+
+ /* Convert up to 1st invalid byte (or up to end) */
+ while ((wc = command_ps[srcpos]) != BB_NUL
+ && !unicode_is_raw_byte(wc)
+ ) {
+ srcpos++;
+ }
+ command_ps[srcpos] = BB_NUL;
+ n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
+ if (n < 0) /* should not happen */
+ break;
+ dstpos += n;
+ if (wc == BB_NUL) /* usually is */
+ break;
+
+ /* We do have invalid byte here! */
+ command_ps[srcpos] = wc; /* restore it */
+ srcpos++;
+ if (dstpos == maxsize)
+ break;
+ dst[dstpos++] = (char) wc;
+ }
+ dst[dstpos] = '\0';
+ return dstpos;
+# endif
+ } else {
+ unsigned i = 0;
+ while ((dst[i] = command_ps[i]) != 0)
+ i++;
+ return i;
+ }
+}
+/* I thought just fputwc(c, stdout) would work. But no... */
+static void BB_PUTCHAR(wchar_t c)
+{
+ if (unicode_status == UNICODE_ON) {
+ char buf[MB_CUR_MAX + 1];
+ mbstate_t mbst = { 0 };
+ ssize_t len = wcrtomb(buf, c, &mbst);
+ if (len > 0) {
+ buf[len] = '\0';
+ fputs(buf, stdout);
+ }
+ } else {
+ /* In this case, c is always one byte */
+ putchar(c);
+ }
+}
+# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
+static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
+# else
+static wchar_t adjust_width_and_validate_wc(wchar_t wc)
+# define adjust_width_and_validate_wc(width_adj, wc) \
+ ((*(width_adj))++, adjust_width_and_validate_wc(wc))
+# endif
+{
+ int w = 1;
+
+ if (unicode_status == UNICODE_ON) {
+ if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
+ /* note: also true for unicode_is_raw_byte(wc) */
+ goto subst;
+ }
+ w = wcwidth(wc);
+ if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
+ || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
+ || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
+ ) {
+ subst:
+ w = 1;
+ wc = CONFIG_SUBST_WCHAR;
+ }
+ }
+
+# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
+ *width_adj += w;
+#endif
+ return wc;
+}
+#else /* !UNICODE */
+static size_t load_string(const char *src)
+{
+ safe_strncpy(command_ps, src, S.maxsize);
+ return strlen(command_ps);
+}
+# if ENABLE_FEATURE_TAB_COMPLETION
+static void save_string(char *dst, unsigned maxsize)
+{
+ safe_strncpy(dst, command_ps, maxsize);
+}
+# endif
+# define BB_PUTCHAR(c) bb_putchar(c)
+/* Should never be called: */
+int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
+#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' */
+#define HACK_FOR_WRONG_WIDTH 1
+static void put_cur_glyph_and_inc_cursor(void)
+{
+ CHAR_T c = command_ps[cursor];
+ unsigned width = 0;
+ int ofs_to_right;
+
+ if (c == BB_NUL) {
+ /* erase character after end of input string */
+ c = ' ';
+ } else {
+ /* advance cursor only if we aren't at the end yet */
+ cursor++;
+ if (unicode_status == UNICODE_ON) {
+ IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
+ c = adjust_width_and_validate_wc(&cmdedit_x, c);
+ IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
+ } else {
+ cmdedit_x++;
+ }
+ }
+
+ ofs_to_right = cmdedit_x - cmdedit_termw;
+ if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
+ /* c fits on this line */
+ BB_PUTCHAR(c);
+ }
+
+ if (ofs_to_right >= 0) {
+ /* we go to the next line */
+#if HACK_FOR_WRONG_WIDTH
+ /* This works better if our idea of term width is wrong
+ * and it is actually wider (often happens on serial lines).
+ * Printing CR,LF *forces* cursor to next line.
+ * OTOH if terminal width is correct AND terminal does NOT
+ * have automargin (IOW: it is moving cursor to next line
+ * by itself (which is wrong for VT-10x terminals)),
+ * this will break things: there will be one extra empty line */
+ puts("\r"); /* + implicit '\n' */
+#else
+ /* VT-10x terminals don't wrap cursor to next line when last char
+ * on the line is printed - cursor stays "over" this char.
+ * Need to print _next_ char too (first one to appear on next line)
+ * to make cursor move down to next line.
+ */
+ /* Works ok only if cmdedit_termw is correct. */
+ c = command_ps[cursor];
+ if (c == BB_NUL)
+ c = ' ';
+ BB_PUTCHAR(c);
+ bb_putchar('\b');
+#endif
+ cmdedit_y++;
+ if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
+ width = 0;
+ } else { /* ofs_to_right > 0 */
+ /* wide char c didn't fit on prev line */
+ BB_PUTCHAR(c);
+ }
+ cmdedit_x = width;
+ }
+}
+
+/* Move to end of line (by printing all chars till the end) */
+static void put_till_end_and_adv_cursor(void)
+{
+ while (cursor < command_len)
+ put_cur_glyph_and_inc_cursor();
+}
+
+/* Go to the next line */
+static void goto_new_line(void)
+{
+ put_till_end_and_adv_cursor();
+ if (cmdedit_x != 0)
+ bb_putchar('\n');
+}
+
+static void beep(void)
+{
+ bb_putchar('\007');
+}
+
+static void put_prompt(void)
+{
+ unsigned w;
+
+ fputs(cmdedit_prompt, stdout);
+ fflush_all();
+ cursor = 0;
+ w = cmdedit_termw; /* read volatile var once */
+ cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
+ cmdedit_x = cmdedit_prmt_len % w;
+}
+
+/* Move back one character */
+/* (optimized for slow terminals) */
+static void input_backward(unsigned num)
+{
+ if (num > cursor)
+ num = cursor;
+ if (num == 0)
+ return;
+ cursor -= num;
+
+ if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
+ && unicode_status == UNICODE_ON
+ ) {
+ /* correct NUM to be equal to _screen_ width */
+ int n = num;
+ num = 0;
+ while (--n >= 0)
+ adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
+ if (num == 0)
+ return;
+ }
+
+ if (cmdedit_x >= num) {
+ cmdedit_x -= num;
+ if (num <= 4) {
+ /* This is longer by 5 bytes on x86.
+ * Also gets miscompiled for ARM users
+ * (busybox.net/bugs/view.php?id=2274).
+ * printf(("\b\b\b\b" + 4) - num);
+ * return;
+ */
+ do {
+ bb_putchar('\b');
+ } while (--num);
+ return;
+ }
+ printf(ESC"[%uD", num);
+ return;
+ }
+
+ /* Need to go one or more lines up */
+ if (ENABLE_UNICODE_WIDE_WCHARS) {
+ /* With wide chars, it is hard to "backtrack"
+ * and reliably figure out where to put cursor.
+ * Example (<> is a wide char; # is an ordinary char, _ cursor):
+ * |prompt: <><> |
+ * |<><><><><><> |
+ * |_ |
+ * and user presses left arrow. num = 1, cmdedit_x = 0,
+ * We need to go up one line, and then - how do we know that
+ * we need to go *10* positions to the right? Because
+ * |prompt: <>#<>|
+ * |<><><>#<><><>|
+ * |_ |
+ * in this situation we need to go *11* positions to the right.
+ *
+ * A simpler thing to do is to redraw everything from the start
+ * up to new cursor position (which is already known):
+ */
+ unsigned sv_cursor;
+ /* go to 1st column; go up to first line */
+ printf("\r" ESC"[%uA", cmdedit_y);
+ cmdedit_y = 0;
+ sv_cursor = cursor;
+ put_prompt(); /* sets cursor to 0 */
+ while (cursor < sv_cursor)
+ put_cur_glyph_and_inc_cursor();
+ } else {
+ int lines_up;
+ unsigned width;
+ /* num = chars to go back from the beginning of current line: */
+ num -= cmdedit_x;
+ width = cmdedit_termw; /* read volatile var once */
+ /* num=1...w: one line up, w+1...2w: two, etc: */
+ lines_up = 1 + (num - 1) / width;
+ cmdedit_x = (width * cmdedit_y - num) % width;
+ cmdedit_y -= lines_up;
+ /* go to 1st column; go up */
+ printf("\r" ESC"[%uA", lines_up);
+ /* go to correct column.
+ * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
+ * need to *make sure* we skip it if cmdedit_x == 0 */
+ if (cmdedit_x)
+ printf(ESC"[%uC", cmdedit_x);
+ }
+}
+
+/* draw prompt, editor line, and clear tail */
+static void redraw(int y, int back_cursor)
+{
+ if (y > 0) /* up y lines */
+ printf(ESC"[%uA", y);
+ bb_putchar('\r');
+ put_prompt();
+ put_till_end_and_adv_cursor();
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
+ input_backward(back_cursor);
+}
+
+/* Delete the char in front of the cursor, optionally saving it
+ * for later putback */
+#if !ENABLE_FEATURE_EDITING_VI
+static void input_delete(void)
+#define input_delete(save) input_delete()
+#else
+static void input_delete(int save)
+#endif
+{
+ int j = cursor;
+
+ if (j == (int)command_len)
+ return;
+
+#if ENABLE_FEATURE_EDITING_VI
+ if (save) {
+ if (newdelflag) {
+ delptr = delbuf;
+ newdelflag = 0;
+ }
+ if ((delptr - delbuf) < DELBUFSIZ)
+ *delptr++ = command_ps[j];
+ }
+#endif
+
+ memmove(command_ps + j, command_ps + j + 1,
+ /* (command_len + 1 [because of NUL]) - (j + 1)
+ * simplified into (command_len - j) */
+ (command_len - j) * sizeof(command_ps[0]));
+ command_len--;
+ put_till_end_and_adv_cursor();
+ /* Last char is still visible, erase it (and more) */
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
+ input_backward(cursor - j); /* back to old pos cursor */
+}
+
+#if ENABLE_FEATURE_EDITING_VI
+static void put(void)
+{
+ int ocursor;
+ int j = delptr - 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) * sizeof(command_ps[0]));
+ memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
+ command_len += j;
+ put_till_end_and_adv_cursor();
+ 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)
+ put_cur_glyph_and_inc_cursor();
+}
+
+#if ENABLE_FEATURE_TAB_COMPLETION
+
+//FIXME:
+//needs to be more clever: currently it thinks that "foo\ b<TAB>
+//matches the file named "foo bar", which is untrue.
+//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
+//not "foo bar <cursor>...
+
+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)
+{
+ /*CVE-2017-16544 https://git.busybox.net/busybox/commit/?id=c3797d40a1c57352192c6106cc0f435e7d9c11e8*/
+ unsigned char *p = (unsigned char*)matched;
+ while (*p) {
+ /* ESC attack fix: drop any string with control chars */
+ if (*p < ' '
+ || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
+ || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
+ ) {
+ free(matched);
+ return;
+ }
+ p++;
+ }
+ matches = xrealloc_vector(matches, 4, num_matches);
+ matches[num_matches] = matched;
+ num_matches++;
+}
+
+# if ENABLE_FEATURE_USERNAME_COMPLETION
+/* Replace "~user/..." with "/homedir/...".
+ * The parameter is malloced, free it or return it
+ * unchanged if no user is matched.
+ */
+static char *username_path_completion(char *ud)
+{
+ struct passwd *entry;
+ char *tilde_name = ud;
+ char *home = NULL;
+
+ ud++; /* skip ~ */
+ if (*ud == '/') { /* "~/..." */
+ home = home_pwd_buf;
+ } else {
+ /* "~user/..." */
+ ud = strchr(ud, '/');
+ *ud = '\0'; /* "~user" */
+ entry = getpwnam(tilde_name + 1);
+ *ud = '/'; /* restore "~user/..." */
+ if (entry)
+ home = entry->pw_dir;
+ }
+ if (home) {
+ ud = concat_path_file(home, ud);
+ free(tilde_name);
+ tilde_name = ud;
+ }
+ return tilde_name;
+}
+
+/* ~use<tab> - find all users with this prefix.
+ * Return the length of the prefix used for matching.
+ */
+static NOINLINE unsigned complete_username(const char *ud)
+{
+ /* Using _r function to avoid pulling in static buffers */
+ char line_buff[256];
+ struct passwd pwd;
+ struct passwd *result;
+ unsigned userlen;
+
+ ud++; /* skip ~ */
+ userlen = strlen(ud);
+
+ setpwent();
+ while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
+ /* Null usernames should result in all users as possible completions. */
+ if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
+ add_match(xasprintf("~%s/", pwd.pw_name));
+ }
+ }
+ endpwent();
+
+ return 1 + userlen;
+}
+# endif /* FEATURE_USERNAME_COMPLETION */
+
+enum {
+ FIND_EXE_ONLY = 0,
+ FIND_DIR_ONLY = 1,
+ FIND_FILE_ONLY = 2,
+};
+
+static int path_parse(char ***p)
+{
+ int npth;
+ const char *pth;
+ char *tmp;
+ char **res;
+
+ if (state->flags & WITH_PATH_LOOKUP)
+ pth = state->path_lookup;
+ else
+ pth = getenv("PATH");
+
+ /* PATH="" or PATH=":"? */
+ 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;
+ tmp++;
+ if (*tmp == '\0')
+ break; /* :<empty> */
+ npth++;
+ }
+
+ *p = res = xmalloc(npth * sizeof(res[0]));
+ 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;
+ }
+ return npth;
+}
+
+/* Complete command, directory or file name.
+ * Return the length of the prefix used for matching.
+ */
+static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
+{
+ char *path1[1];
+ char **paths = path1;
+ int npaths;
+ int i;
+ unsigned pf_len;
+ const char *pfind;
+ char *dirbuf = NULL;
+
+ npaths = 1;
+ path1[0] = (char*)".";
+
+ pfind = strrchr(command, '/');
+ if (!pfind) {
+ if (type == FIND_EXE_ONLY)
+ npaths = path_parse(&paths);
+ pfind = command;
+ } else {
+ /* point to 'l' in "..../last_component" */
+ pfind++;
+ /* dirbuf = ".../.../.../" */
+ dirbuf = xstrndup(command, pfind - command);
+# if ENABLE_FEATURE_USERNAME_COMPLETION
+ if (dirbuf[0] == '~') /* ~/... or ~user/... */
+ dirbuf = username_path_completion(dirbuf);
+# endif
+ path1[0] = dirbuf;
+ }
+ pf_len = strlen(pfind);
+
+ for (i = 0; i < npaths; i++) {
+ DIR *dir;
+ struct dirent *next;
+ struct stat st;
+ char *found;
+
+ dir = opendir(paths[i]);
+ if (!dir)
+ continue; /* don't print an error */
+
+ while ((next = readdir(dir)) != NULL) {
+ unsigned len;
+ const char *name_found = next->d_name;
+
+ /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
+ if (!pfind[0] && DOT_OR_DOTDOT(name_found))
+ continue;
+ /* match? */
+ if (strncmp(name_found, pfind, pf_len) != 0)
+ continue; /* no */
+
+ found = concat_path_file(paths[i], name_found);
+ /* NB: stat() first so that we see is it a directory;
+ * but if that fails, use lstat() so that
+ * we still match dangling links */
+ if (stat(found, &st) && lstat(found, &st))
+ goto cont; /* hmm, remove in progress? */
+
+ /* Save only name */
+ len = strlen(name_found);
+ found = xrealloc(found, len + 2); /* +2: for slash and NUL */
+ strcpy(found, name_found);
+
+ if (S_ISDIR(st.st_mode)) {
+ /* name is a directory, add slash */
+ found[len] = '/';
+ found[len + 1] = '\0';
+ } else {
+ /* skip files if looking for dirs only (example: cd) */
+ if (type == FIND_DIR_ONLY)
+ goto cont;
+ }
+ /* add it to the list */
+ add_match(found);
+ continue;
+ cont:
+ free(found);
+ }
+ closedir(dir);
+ } /* for every path */
+
+ if (paths != path1) {
+ free(paths[0]); /* allocated memory is only in first member */
+ free(paths);
+ }
+ free(dirbuf);
+
+ return pf_len;
+}
+
+/* build_match_prefix:
+ * On entry, match_buf contains everything up to cursor at the moment <tab>
+ * was pressed. This function looks at it, figures out what part of it
+ * constitutes the command/file/directory prefix to use for completion,
+ * and rewrites match_buf to contain only that part.
+ */
+#define dbg_bmp 0
+/* Helpers: */
+/* QUOT is used on elements of int_buf[], which are bytes,
+ * not Unicode chars. Therefore it works correctly even in Unicode mode.
+ */
+#define QUOT (UCHAR_MAX+1)
+static void remove_chunk(int16_t *int_buf, int beg, int end)
+{
+ /* beg must be <= end */
+ if (beg == end)
+ return;
+
+ while ((int_buf[beg] = int_buf[end]) != 0)
+ beg++, end++;
+
+ if (dbg_bmp) {
+ int i;
+ for (i = 0; int_buf[i]; i++)
+ bb_putchar((unsigned char)int_buf[i]);
+ bb_putchar('\n');
+ }
+}
+/* Caller ensures that match_buf points to a malloced buffer
+ * big enough to hold strlen(match_buf)*2 + 2
+ */
+static NOINLINE int build_match_prefix(char *match_buf)
+{
+ int i, j;
+ int command_mode;
+ int16_t *int_buf = (int16_t*)match_buf;
+
+ if (dbg_bmp) printf("\n%s\n", match_buf);
+
+ /* Copy in reverse order, since they overlap */
+ i = strlen(match_buf);
+ do {
+ int_buf[i] = (unsigned char)match_buf[i];
+ i--;
+ } while (i >= 0);
+
+ /* Mark every \c as "quoted c" */
+ for (i = 0; int_buf[i]; i++) {
+ if (int_buf[i] == '\\') {
+ remove_chunk(int_buf, i, i + 1);
+ int_buf[i] |= QUOT;
+ }
+ }
+ /* Quote-mark "chars" and 'chars', drop delimiters */
+ {
+ int in_quote = 0;
+ i = 0;
+ while (int_buf[i]) {
+ int cur = int_buf[i];
+ if (!cur)
+ break;
+ if (cur == '\'' || cur == '"') {
+ if (!in_quote || (cur == in_quote)) {
+ in_quote ^= cur;
+ remove_chunk(int_buf, i, i + 1);
+ continue;
+ }
+ }
+ if (in_quote)
+ int_buf[i] = cur | QUOT;
+ i++;
+ }
+ }
+
+ /* Remove everything up to command delimiters:
+ * ';' ';;' '&' '|' '&&' '||',
+ * but careful with '>&' '<&' '>|'
+ */
+ for (i = 0; int_buf[i]; i++) {
+ int cur = int_buf[i];
+ if (cur == ';' || cur == '&' || cur == '|') {
+ int prev = i ? int_buf[i - 1] : 0;
+ if (cur == '&' && (prev == '>' || prev == '<')) {
+ continue;
+ } else if (cur == '|' && prev == '>') {
+ continue;
+ }
+ remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
+ i = -1; /* back to square 1 */
+ }
+ }
+ /* Remove all `cmd` */
+ for (i = 0; int_buf[i]; i++) {
+ if (int_buf[i] == '`') {
+ for (j = i + 1; int_buf[j]; j++) {
+ if (int_buf[j] == '`') {
+ /* `cmd` should count as a word:
+ * `cmd` c<tab> should search for files c*,
+ * not commands c*. Therefore we don't drop
+ * `cmd` entirely, we replace it with single `.
+ */
+ remove_chunk(int_buf, i, j);
+ goto next;
+ }
+ }
+ /* No closing ` - command mode, remove all up to ` */
+ remove_chunk(int_buf, 0, i + 1);
+ break;
+ next: ;
+ }
+ }
+
+ /* Remove "cmd (" and "cmd {"
+ * Example: "if { c<tab>"
+ * In this example, c should be matched as command pfx.
+ */
+ for (i = 0; int_buf[i]; i++) {
+ if (int_buf[i] == '(' || int_buf[i] == '{') {
+ remove_chunk(int_buf, 0, i + 1);
+ i = -1; /* back to square 1 */
+ }
+ }
+
+ /* Remove leading unquoted spaces */
+ for (i = 0; int_buf[i]; i++)
+ if (int_buf[i] != ' ')
+ break;
+ remove_chunk(int_buf, 0, i);
+
+ /* Determine completion mode */
+ 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
+ && (char)int_buf[0] == 'c'
+ && (char)int_buf[1] == 'd'
+ && i == 2 /* -> int_buf[2] == ' ' */
+ ) {
+ command_mode = FIND_DIR_ONLY;
+ } else {
+ command_mode = FIND_FILE_ONLY;
+ break;
+ }
+ }
+ }
+ if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
+
+ /* Remove everything except last word */
+ for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
+ continue;
+ for (--i; i >= 0; i--) {
+ int cur = int_buf[i];
+ if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
+ remove_chunk(int_buf, 0, i + 1);
+ break;
+ }
+ }
+
+ /* Convert back to string of _chars_ */
+ i = 0;
+ while ((match_buf[i] = int_buf[i]) != '\0')
+ i++;
+
+ if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
+
+ return command_mode;
+}
+
+/*
+ * Display by column (original idea from ls applet,
+ * very optimized by me [Vladimir] :)
+ */
+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 = unicode_strwidth(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 - unicode_strwidth(matches[n])), ""
+ );
+ }
+ if (ENABLE_UNICODE_SUPPORT)
+ puts(printable_string(NULL, matches[n]));
+ else
+ puts(matches[n]);
+ }
+}
+
+static const char *is_special_char(char c)
+{
+ return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
+}
+
+static char *quote_special_chars(char *found)
+{
+ int l = 0;
+ char *s = xzalloc((strlen(found) + 1) * 2);
+
+ while (*found) {
+ if (is_special_char(*found))
+ s[l++] = '\\';
+ s[l++] = *found++;
+ }
+ /* s[l] = '\0'; - already is */
+ return s;
+}
+
+/* Do TAB completion */
+static NOINLINE void input_tab(smallint *lastWasTab)
+{
+ char *chosen_match;
+ char *match_buf;
+ size_t len_found;
+ /* Length of string used for matching */
+ unsigned match_pfx_len = match_pfx_len;
+ int find_type;
+# if ENABLE_UNICODE_SUPPORT
+ /* cursor pos in command converted to multibyte form */
+ int cursor_mb;
+# endif
+ if (!(state->flags & TAB_COMPLETION))
+ return;
+
+ if (*lastWasTab) {
+ /* The last char was a TAB too.
+ * Print a list of all the available choices.
+ */
+ if (num_matches > 0) {
+ /* cursor will be changed by goto_new_line() */
+ int sav_cursor = cursor;
+ goto_new_line();
+ showfiles();
+ redraw(0, command_len - sav_cursor);
+ }
+ return;
+ }
+
+ *lastWasTab = 1;
+ chosen_match = NULL;
+
+ /* Make a local copy of the string up to the position of the cursor.
+ * build_match_prefix will expand it into int16_t's, need to allocate
+ * twice as much as the string_len+1.
+ * (we then also (ab)use this extra space later - see (**))
+ */
+ match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
+# if !ENABLE_UNICODE_SUPPORT
+ save_string(match_buf, cursor + 1); /* +1 for NUL */
+# else
+ {
+ CHAR_T wc = command_ps[cursor];
+ command_ps[cursor] = BB_NUL;
+ save_string(match_buf, MAX_LINELEN);
+ command_ps[cursor] = wc;
+ cursor_mb = strlen(match_buf);
+ }
+# endif
+ find_type = build_match_prefix(match_buf);
+
+ /* 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 (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
+ match_pfx_len = complete_username(match_buf);
+# endif
+ /* If complete_username() did not match,
+ * try to match a command in $PATH, or a directory, or a file */
+ if (!matches)
+ match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
+
+ /* Account for backslashes which will be inserted
+ * by quote_special_chars() later */
+ {
+ const char *e = match_buf + strlen(match_buf);
+ const char *s = e - match_pfx_len;
+ while (s < e)
+ if (is_special_char(*s++))
+ match_pfx_len++;
+ }
+
+ /* Remove duplicates */
+ if (matches) {
+ unsigned i, n = 0;
+ qsort_string_vector(matches, num_matches);
+ 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;
+ }
+
+ /* Did we find exactly one match? */
+ if (num_matches != 1) { /* no */
+ char *cp;
+ beep();
+ if (!matches)
+ goto ret; /* no matches at all */
+ /* Find common prefix */
+ chosen_match = xstrdup(matches[0]);
+ for (cp = chosen_match; *cp; cp++) {
+ unsigned n;
+ for (n = 1; n < num_matches; n++) {
+ if (matches[n][cp - chosen_match] != *cp) {
+ goto stop;
+ }
+ }
+ }
+ stop:
+ if (cp == chosen_match) { /* have unique prefix? */
+ goto ret; /* no */
+ }
+ *cp = '\0';
+ cp = quote_special_chars(chosen_match);
+ free(chosen_match);
+ chosen_match = cp;
+ len_found = strlen(chosen_match);
+ } else { /* exactly one match */
+ /* Next <tab> is not a double-tab */
+ *lastWasTab = 0;
+
+ chosen_match = quote_special_chars(matches[0]);
+ len_found = strlen(chosen_match);
+ if (chosen_match[len_found-1] != '/') {
+ chosen_match[len_found] = ' ';
+ chosen_match[++len_found] = '\0';
+ }
+ }
+
+# if !ENABLE_UNICODE_SUPPORT
+ /* Have space to place the match? */
+ /* The result consists of three parts with these lengths: */
+ /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
+ /* it simplifies into: */
+ if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
+ int pos;
+ /* save tail */
+ strcpy(match_buf, &command_ps[cursor]);
+ /* add match and tail */
+ sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
+ command_len = strlen(command_ps);
+ /* new pos */
+ pos = cursor + len_found - match_pfx_len;
+ /* write out the matched command */
+ redraw(cmdedit_y, command_len - pos);
+ }
+# else
+ {
+ /* Use 2nd half of match_buf as scratch space - see (**) */
+ char *command = match_buf + MAX_LINELEN;
+ int len = save_string(command, MAX_LINELEN);
+ /* Have space to place the match? */
+ /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
+ if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
+ int pos;
+ /* save tail */
+ strcpy(match_buf, &command[cursor_mb]);
+ /* where do we want to have cursor after all? */
+ strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
+ len = load_string(command);
+ /* add match and tail */
+ sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
+ command_len = load_string(command);
+ /* write out the matched command */
+ /* paranoia: load_string can return 0 on conv error,
+ * prevent passing pos = (0 - 12) to redraw */
+ pos = command_len - len;
+ redraw(cmdedit_y, pos >= 0 ? pos : 0);
+ }
+ }
+# endif
+ ret:
+ free(chosen_match);
+ free(match_buf);
+}
+
+#endif /* FEATURE_TAB_COMPLETION */
+
+
+line_input_t* FAST_FUNC new_line_input_t(int flags)
+{
+ line_input_t *n = xzalloc(sizeof(*n));
+ n->flags = flags;
+ n->max_history = MAX_HISTORY;
+ return n;
+}
+
+
+#if MAX_HISTORY > 0
+
+unsigned size_from_HISTFILESIZE(const char *hp)
+{
+ int size = MAX_HISTORY;
+ if (hp) {
+ size = atoi(hp);
+ if (size <= 0)
+ return 1;
+ if (size > MAX_HISTORY)
+ return MAX_HISTORY;
+ }
+ return size;
+}
+
+static void save_command_ps_at_cur_history(void)
+{
+ if (command_ps[0] != BB_NUL) {
+ int cur = state->cur_history;
+ free(state->history[cur]);
+
+# if ENABLE_UNICODE_SUPPORT
+ {
+ char tbuf[MAX_LINELEN];
+ save_string(tbuf, sizeof(tbuf));
+ state->history[cur] = xstrdup(tbuf);
+ }
+# else
+ state->history[cur] = xstrdup(command_ps);
+# endif
+ }
+}
+
+/* state->flags is already checked to be nonzero */
+static int get_previous_history(void)
+{
+ if ((state->flags & DO_HISTORY) && state->cur_history) {
+ save_command_ps_at_cur_history();
+ state->cur_history--;
+ return 1;
+ }
+ beep();
+ return 0;
+}
+
+static int get_next_history(void)
+{
+ if (state->flags & DO_HISTORY) {
+ if (state->cur_history < state->cnt_history) {
+ save_command_ps_at_cur_history(); /* save the current history line */
+ return ++state->cur_history;
+ }
+ }
+ beep();
+ return 0;
+}
+
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
+/* We try to ensure that concurrent additions to the history
+ * do not overwrite each other.
+ * Otherwise shell users get unhappy.
+ *
+ * History file is trimmed lazily, when it grows several times longer
+ * than configured MAX_HISTORY lines.
+ */
+
+static void free_line_input_t(line_input_t *n)
+{
+ int i = n->cnt_history;
+ while (i > 0)
+ free(n->history[--i]);
+ free(n);
+}
+
+/* state->flags is already checked to be nonzero */
+static void load_history(line_input_t *st_parm)
+{
+ char *temp_h[MAX_HISTORY];
+ char *line;
+ FILE *fp;
+ unsigned idx, i, line_len;
+
+ /* NB: do not trash old history if file can't be opened */
+
+ fp = fopen_for_read(st_parm->hist_file);
+ if (fp) {
+ /* clean up old history */
+ for (idx = st_parm->cnt_history; idx > 0;) {
+ idx--;
+ free(st_parm->history[idx]);
+ st_parm->history[idx] = NULL;
+ }
+
+ /* fill temp_h[], retaining only last MAX_HISTORY lines */
+ memset(temp_h, 0, sizeof(temp_h));
+ idx = 0;
+ st_parm->cnt_history_in_file = 0;
+ while ((line = xmalloc_fgetline(fp)) != NULL) {
+ if (line[0] == '\0') {
+ free(line);
+ continue;
+ }
+ free(temp_h[idx]);
+ temp_h[idx] = line;
+ st_parm->cnt_history_in_file++;
+ idx++;
+ if (idx == st_parm->max_history)
+ idx = 0;
+ }
+ fclose(fp);
+
+ /* find first non-NULL temp_h[], if any */
+ if (st_parm->cnt_history_in_file) {
+ while (temp_h[idx] == NULL) {
+ idx++;
+ if (idx == st_parm->max_history)
+ idx = 0;
+ }
+ }
+
+ /* copy temp_h[] to st_parm->history[] */
+ for (i = 0; i < st_parm->max_history;) {
+ line = temp_h[idx];
+ if (!line)
+ break;
+ idx++;
+ if (idx == st_parm->max_history)
+ idx = 0;
+ line_len = strlen(line);
+ if (line_len >= MAX_LINELEN)
+ line[MAX_LINELEN-1] = '\0';
+ st_parm->history[i++] = line;
+ }
+ st_parm->cnt_history = i;
+ if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
+ st_parm->cnt_history_in_file = i;
+ }
+}
+
+# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
+void save_history(line_input_t *st)
+{
+ FILE *fp;
+
+ if (!st->hist_file)
+ return;
+ if (st->cnt_history <= st->cnt_history_in_file)
+ return;
+
+ fp = fopen(st->hist_file, "a");
+ if (fp) {
+ int i, fd;
+ char *new_name;
+ line_input_t *st_temp;
+
+ for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
+ fprintf(fp, "%s\n", st->history[i]);
+ fclose(fp);
+
+ /* we may have concurrently written entries from others.
+ * load them */
+ st_temp = new_line_input_t(st->flags);
+ st_temp->hist_file = st->hist_file;
+ st_temp->max_history = st->max_history;
+ load_history(st_temp);
+
+ /* write out temp file and replace hist_file atomically */
+ new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
+ fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd >= 0) {
+ fp = xfdopen_for_write(fd);
+ for (i = 0; i < st_temp->cnt_history; i++)
+ fprintf(fp, "%s\n", st_temp->history[i]);
+ fclose(fp);
+ if (rename(new_name, st->hist_file) == 0)
+ st->cnt_history_in_file = st_temp->cnt_history;
+ }
+ free(new_name);
+ free_line_input_t(st_temp);
+ }
+}
+# else
+static void save_history(char *str)
+{
+ int fd;
+ int len, len2;
+
+ if (!state->hist_file)
+ return;
+
+ fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
+ if (fd < 0)
+ return;
+ xlseek(fd, 0, SEEK_END); /* paranoia */
+ len = strlen(str);
+ str[len] = '\n'; /* we (try to) do atomic write */
+ len2 = full_write(fd, str, len + 1);
+ str[len] = '\0';
+ close(fd);
+ if (len2 != len + 1)
+ return; /* "wtf?" */
+
+ /* did we write so much that history file needs trimming? */
+ state->cnt_history_in_file++;
+ if (state->cnt_history_in_file > state->max_history * 4) {
+ char *new_name;
+ line_input_t *st_temp;
+
+ /* we may have concurrently written entries from others.
+ * load them */
+ st_temp = new_line_input_t(state->flags);
+ st_temp->hist_file = state->hist_file;
+ st_temp->max_history = state->max_history;
+ load_history(st_temp);
+
+ /* write out temp file and replace hist_file atomically */
+ new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
+ fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd >= 0) {
+ FILE *fp;
+ int i;
+
+ fp = xfdopen_for_write(fd);
+ for (i = 0; i < st_temp->cnt_history; i++)
+ fprintf(fp, "%s\n", st_temp->history[i]);
+ fclose(fp);
+ if (rename(new_name, state->hist_file) == 0)
+ state->cnt_history_in_file = st_temp->cnt_history;
+ }
+ free(new_name);
+ free_line_input_t(st_temp);
+ }
+}
+# endif
+# else
+# define load_history(a) ((void)0)
+# define save_history(a) ((void)0)
+# endif /* FEATURE_COMMAND_SAVEHISTORY */
+
+static void remember_in_history(char *str)
+{
+ int i;
+
+ if (!(state->flags & DO_HISTORY))
+ return;
+ if (str[0] == '\0')
+ return;
+ i = state->cnt_history;
+ /* Don't save dupes */
+ if (i && strcmp(state->history[i-1], str) == 0)
+ return;
+
+ free(state->history[state->max_history]); /* redundant, paranoia */
+ state->history[state->max_history] = NULL; /* redundant, paranoia */
+
+ /* If history[] is full, remove the oldest command */
+ /* we need to keep history[state->max_history] empty, hence >=, not > */
+ if (i >= state->max_history) {
+ free(state->history[0]);
+ for (i = 0; i < state->max_history-1; i++)
+ state->history[i] = state->history[i+1];
+ /* i == state->max_history-1 */
+# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
+ if (state->cnt_history_in_file)
+ state->cnt_history_in_file--;
+# endif
+ }
+ /* i <= state->max_history-1 */
+ state->history[i++] = xstrdup(str);
+ /* i <= state->max_history */
+ state->cur_history = i;
+ state->cnt_history = i;
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
+ save_history(str);
+# endif
+ IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
+}
+
+#else /* MAX_HISTORY == 0 */
+# define remember_in_history(a) ((void)0)
+#endif /* MAX_HISTORY */
+
+
+#if ENABLE_FEATURE_EDITING_VI
+/*
+ * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
+ */
+static void
+vi_Word_motion(int eat)
+{
+ CHAR_T *command = command_ps;
+
+ while (cursor < command_len && !BB_isspace(command[cursor]))
+ input_forward();
+ if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
+ input_forward();
+}
+
+static void
+vi_word_motion(int eat)
+{
+ CHAR_T *command = command_ps;
+
+ if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor < command_len
+ && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
+ ) {
+ input_forward();
+ }
+ } else if (BB_ispunct(command[cursor])) {
+ while (cursor < command_len && BB_ispunct(command[cursor+1]))
+ input_forward();
+ }
+
+ if (cursor < command_len)
+ input_forward();
+
+ if (eat) {
+ while (cursor < command_len && BB_isspace(command[cursor]))
+ input_forward();
+ }
+}
+
+static void
+vi_End_motion(void)
+{
+ CHAR_T *command = command_ps;
+
+ input_forward();
+ while (cursor < command_len && BB_isspace(command[cursor]))
+ input_forward();
+ while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
+ input_forward();
+}
+
+static void
+vi_end_motion(void)
+{
+ CHAR_T *command = command_ps;
+
+ if (cursor >= command_len-1)
+ return;
+ input_forward();
+ while (cursor < command_len-1 && BB_isspace(command[cursor]))
+ input_forward();
+ if (cursor >= command_len-1)
+ return;
+ if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor < command_len-1
+ && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
+ ) {
+ input_forward();
+ }
+ } else if (BB_ispunct(command[cursor])) {
+ while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
+ input_forward();
+ }
+}
+
+static void
+vi_Back_motion(void)
+{
+ CHAR_T *command = command_ps;
+
+ while (cursor > 0 && BB_isspace(command[cursor-1]))
+ input_backward(1);
+ while (cursor > 0 && !BB_isspace(command[cursor-1]))
+ input_backward(1);
+}
+
+static void
+vi_back_motion(void)
+{
+ CHAR_T *command = command_ps;
+
+ if (cursor <= 0)
+ return;
+ input_backward(1);
+ while (cursor > 0 && BB_isspace(command[cursor]))
+ input_backward(1);
+ if (cursor <= 0)
+ return;
+ if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor > 0
+ && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
+ ) {
+ input_backward(1);
+ }
+ } else if (BB_ispunct(command[cursor])) {
+ while (cursor > 0 && BB_ispunct(command[cursor-1]))
+ input_backward(1);
+ }
+}
+#endif
+
+/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
+static void ctrl_left(void)
+{
+ CHAR_T *command = command_ps;
+
+ while (1) {
+ CHAR_T c;
+
+ input_backward(1);
+ if (cursor == 0)
+ break;
+ c = command[cursor];
+ if (c != ' ' && !BB_ispunct(c)) {
+ /* we reached a "word" delimited by spaces/punct.
+ * go to its beginning */
+ while (1) {
+ c = command[cursor - 1];
+ if (c == ' ' || BB_ispunct(c))
+ break;
+ input_backward(1);
+ if (cursor == 0)
+ break;
+ }
+ break;
+ }
+ }
+}
+static void ctrl_right(void)
+{
+ CHAR_T *command = command_ps;
+
+ while (1) {
+ CHAR_T c;
+
+ c = command[cursor];
+ if (c == BB_NUL)
+ break;
+ if (c != ' ' && !BB_ispunct(c)) {
+ /* we reached a "word" delimited by spaces/punct.
+ * go to its end + 1 */
+ while (1) {
+ input_forward();
+ c = command[cursor];
+ if (c == BB_NUL || c == ' ' || BB_ispunct(c))
+ break;
+ }
+ break;
+ }
+ input_forward();
+ }
+}
+
+
+/*
+ * read_line_input and its helpers
+ */
+
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+static void ask_terminal(void)
+{
+ /* Ask terminal where is the cursor now.
+ * lineedit_read_key handles response and corrects
+ * our idea of current cursor position.
+ * Testcase: run "echo -n long_line_long_line_long_line",
+ * then type in a long, wrapping command and try to
+ * delete it using backspace key.
+ * Note: we print it _after_ prompt, because
+ * prompt may contain CR. Example: PS1='\[\r\n\]\w '
+ */
+ /* Problem: if there is buffered input on stdin,
+ * the response will be delivered later,
+ * possibly to an unsuspecting application.
+ * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
+ * Result:
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
+ * ~/srcdevel/bbox/fix/busybox.t4 #
+ *
+ * Checking for input with poll only makes the race narrower,
+ * I still can trigger it. Strace:
+ *
+ * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
+ * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
+ * write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
+ * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
+ * read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
+ */
+ struct pollfd pfd;
+
+ pfd.fd = STDIN_FILENO;
+ pfd.events = POLLIN;
+ if (safe_poll(&pfd, 1, 0) == 0) {
+ S.sent_ESC_br6n = 1;
+ fputs(ESC"[6n", stdout);
+ fflush_all(); /* make terminal see it ASAP! */
+ }
+}
+#else
+#define ask_terminal() ((void)0)
+#endif
+
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+static void parse_and_put_prompt(const char *prmt_ptr)
+{
+ cmdedit_prompt = prmt_ptr;
+ cmdedit_prmt_len = strlen(prmt_ptr);
+ put_prompt();
+}
+#else
+static void parse_and_put_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 *cwd_buf = xrealloc_getcwd_or_warn(NULL);
+ char cbuf[2];
+ char c;
+ char *pbuf;
+
+ cmdedit_prmt_len = 0;
+
+ if (!cwd_buf) {
+ cwd_buf = (char *)bb_msg_unknown;
+ }
+
+ cbuf[1] = '\0'; /* never changes */
+
+ while (*prmt_ptr) {
+ char *free_me = NULL;
+
+ pbuf = cbuf;
+ 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_USERNAME_OR_HOMEDIR
+ case 'u':
+ pbuf = user_buf ? user_buf : (char*)"";
+ break;
+# endif
+ case 'h':
+ pbuf = free_me = safe_gethostname();
+ *strchrnul(pbuf, '.') = '\0';
+ break;
+ case '$':
+ c = (geteuid() == 0 ? '#' : '$');
+ break;
+# if ENABLE_USERNAME_OR_HOMEDIR
+ case 'w':
+ /* /home/user[/something] -> ~[/something] */
+ pbuf = cwd_buf;
+ l = strlen(home_pwd_buf);
+ if (l != 0
+ && strncmp(home_pwd_buf, cwd_buf, l) == 0
+ && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
+ && strlen(cwd_buf + l) < PATH_MAX
+ ) {
+ pbuf = free_me = xasprintf("~%s", cwd_buf + l);
+ }
+ break;
+# endif
+ case 'W':
+ pbuf = cwd_buf;
+ cp = strrchr(pbuf, '/');
+ if (cp != NULL && cp != pbuf)
+ pbuf += (cp-pbuf) + 1;
+ break;
+ case '!':
+ pbuf = free_me = xasprintf("%d", num_ok_lines);
+ break;
+ case 'e': case 'E': /* \e \E = \033 */
+ c = '\033';
+ break;
+ case 'x': case 'X': {
+ char buf2[4];
+ for (l = 0; l < 3;) {
+ unsigned h;
+ buf2[l++] = *prmt_ptr;
+ buf2[l] = '\0';
+ h = strtoul(buf2, &pbuf, 16);
+ if (h > UCHAR_MAX || (pbuf - buf2) < l) {
+ buf2[--l] = '\0';
+ break;
+ }
+ prmt_ptr++;
+ }
+ c = (char)strtoul(buf2, NULL, 16);
+ if (c == 0)
+ c = '?';
+ pbuf = cbuf;
+ break;
+ }
+ case '[': case ']':
+ if (c == flg_not_length) {
+ flg_not_length = (flg_not_length == '[' ? ']' : '[');
+ continue;
+ }
+ break;
+ } /* switch */
+ } /* if */
+ } /* if */
+ cbuf[0] = 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);
+ free(free_me);
+ } /* while */
+
+ if (cwd_buf != (char *)bb_msg_unknown)
+ free(cwd_buf);
+ cmdedit_prompt = prmt_mem_ptr;
+ put_prompt();
+}
+#endif
+
+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_all();
+ }
+}
+
+static void win_changed(int nsig)
+{
+ int sv_errno = errno;
+ unsigned width;
+
+ get_terminal_width_height(0, &width, NULL);
+//FIXME: cmdedit_setwidth() -> redraw() -> printf() -> KABOOM! (we are in signal handler!)
+ cmdedit_setwidth(width, /*redraw_flg:*/ nsig);
+
+ errno = sv_errno;
+}
+
+static int lineedit_read_key(char *read_key_buffer, int timeout)
+{
+ int64_t ic;
+#if ENABLE_UNICODE_SUPPORT
+ char unicode_buf[MB_CUR_MAX + 1];
+ int unicode_idx = 0;
+#endif
+
+ while (1) {
+ /* Wait for input. TIMEOUT = -1 makes read_key wait even
+ * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
+ * insist on full MB_CUR_MAX buffer to declare input like
+ * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
+ *
+ * Note: read_key sets errno to 0 on success.
+ */
+ ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
+ if (errno) {
+#if ENABLE_UNICODE_SUPPORT
+ if (errno == EAGAIN && unicode_idx != 0)
+ goto pushback;
+#endif
+ break;
+ }
+
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ if ((int32_t)ic == KEYCODE_CURSOR_POS
+ && S.sent_ESC_br6n
+ ) {
+ S.sent_ESC_br6n = 0;
+ if (cursor == 0) { /* otherwise it may be bogus */
+ int col = ((ic >> 32) & 0x7fff) - 1;
+ if (col > cmdedit_prmt_len) {
+ cmdedit_x += (col - cmdedit_prmt_len);
+ while (cmdedit_x >= cmdedit_termw) {
+ cmdedit_x -= cmdedit_termw;
+ cmdedit_y++;
+ }
+ }
+ }
+ continue;
+ }
+#endif
+
+#if ENABLE_UNICODE_SUPPORT
+ if (unicode_status == UNICODE_ON) {
+ wchar_t wc;
+
+ if ((int32_t)ic < 0) /* KEYCODE_xxx */
+ break;
+ // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
+
+ unicode_buf[unicode_idx++] = ic;
+ unicode_buf[unicode_idx] = '\0';
+ if (mbstowcs(&wc, unicode_buf, 1) != 1) {
+ /* Not (yet?) a valid unicode char */
+ if (unicode_idx < MB_CUR_MAX) {
+ timeout = 50;
+ continue;
+ }
+ pushback:
+ /* Invalid sequence. Save all "bad bytes" except first */
+ read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
+# if !ENABLE_UNICODE_PRESERVE_BROKEN
+ ic = CONFIG_SUBST_WCHAR;
+# else
+ ic = unicode_mark_raw_byte(unicode_buf[0]);
+# endif
+ } else {
+ /* Valid unicode char, return its code */
+ ic = wc;
+ }
+ }
+#endif
+ break;
+ }
+
+ return ic;
+}
+
+#if ENABLE_UNICODE_BIDI_SUPPORT
+static int isrtl_str(void)
+{
+ int idx = cursor;
+
+ while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
+ idx++;
+ return unicode_bidi_isrtl(command_ps[idx]);
+}
+#else
+# define isrtl_str() 0
+#endif
+
+/* leave out the "vi-mode"-only case labels if vi editing isn't
+ * configured. */
+#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
+
+/* convert uppercase ascii to equivalent control char, for readability */
+#undef CTRL
+#define CTRL(a) ((a) & ~0x40)
+
+enum {
+ VI_CMDMODE_BIT = 0x40000000,
+ /* 0x80000000 bit flags KEYCODE_xxx */
+};
+
+#if ENABLE_FEATURE_REVERSE_SEARCH
+/* Mimic readline Ctrl-R reverse history search.
+ * When invoked, it shows the following prompt:
+ * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
+ * and typing results in search being performed:
+ * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
+ * Search is performed by looking at progressively older lines in history.
+ * Ctrl-R again searches for the next match in history.
+ * Backspace deletes last matched char.
+ * Control keys exit search and return to normal editing (at current history line).
+ */
+static int32_t reverse_i_search(void)
+{
+ char match_buf[128]; /* for user input */
+ char read_key_buffer[KEYCODE_BUFFER_SIZE];
+ const char *matched_history_line;
+ const char *saved_prompt;
+ int32_t ic;
+
+ matched_history_line = NULL;
+ read_key_buffer[0] = 0;
+ match_buf[0] = '\0';
+
+ /* Save and replace the prompt */
+ saved_prompt = cmdedit_prompt;
+ goto set_prompt;
+
+ while (1) {
+ int h;
+ unsigned match_buf_len = strlen(match_buf);
+
+ fflush_all();
+//FIXME: correct timeout?
+ ic = lineedit_read_key(read_key_buffer, -1);
+
+ switch (ic) {
+ case CTRL('R'): /* searching for the next match */
+ break;
+
+ case '\b':
+ case '\x7f':
+ /* Backspace */
+ if (unicode_status == UNICODE_ON) {
+ while (match_buf_len != 0) {
+ uint8_t c = match_buf[--match_buf_len];
+ if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
+ break; /* yes */
+ }
+ } else {
+ if (match_buf_len != 0)
+ match_buf_len--;
+ }
+ match_buf[match_buf_len] = '\0';
+ break;
+
+ default:
+ if (ic < ' '
+ || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
+ || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
+ ) {
+ goto ret;
+ }
+
+ /* Append this char */
+#if ENABLE_UNICODE_SUPPORT
+ if (unicode_status == UNICODE_ON) {
+ mbstate_t mbstate = { 0 };
+ char buf[MB_CUR_MAX + 1];
+ int len = wcrtomb(buf, ic, &mbstate);
+ if (len > 0) {
+ buf[len] = '\0';
+ if (match_buf_len + len < sizeof(match_buf))
+ strcpy(match_buf + match_buf_len, buf);
+ }
+ } else
+#endif
+ if (match_buf_len < sizeof(match_buf) - 1) {
+ match_buf[match_buf_len] = ic;
+ match_buf[match_buf_len + 1] = '\0';
+ }
+ break;
+ } /* switch (ic) */
+
+ /* Search in history for match_buf */
+ h = state->cur_history;
+ if (ic == CTRL('R'))
+ h--;
+ while (h >= 0) {
+ if (state->history[h]) {
+ char *match = strstr(state->history[h], match_buf);
+ if (match) {
+ state->cur_history = h;
+ matched_history_line = state->history[h];
+ command_len = load_string(matched_history_line);
+ cursor = match - matched_history_line;
+//FIXME: cursor position for Unicode case
+
+ free((char*)cmdedit_prompt);
+ set_prompt:
+ cmdedit_prompt = xasprintf("(reverse-i-search)'%s': ", match_buf);
+ cmdedit_prmt_len = strlen(cmdedit_prompt);
+ goto do_redraw;
+ }
+ }
+ h--;
+ }
+
+ /* Not found */
+ match_buf[match_buf_len] = '\0';
+ beep();
+ continue;
+
+ do_redraw:
+ redraw(cmdedit_y, command_len - cursor);
+ } /* while (1) */
+
+ ret:
+ if (matched_history_line)
+ command_len = load_string(matched_history_line);
+
+ free((char*)cmdedit_prompt);
+ cmdedit_prompt = saved_prompt;
+ cmdedit_prmt_len = strlen(cmdedit_prompt);
+ redraw(cmdedit_y, command_len - cursor);
+
+ return ic;
+}
+#endif
+
+/* maxsize must be >= 2.
+ * Returns:
+ * -1 on read errors or EOF, or on bare Ctrl-D,
+ * 0 on ctrl-C (the line entered is still returned in 'command'),
+ * >0 length of input string, including terminating '\n'
+ */
+int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize, int timeout)
+{
+ int len;
+#if ENABLE_FEATURE_TAB_COMPLETION
+ smallint lastWasTab = 0;
+#endif
+ smallint break_out = 0;
+#if ENABLE_FEATURE_EDITING_VI
+ smallint vi_cmdmode = 0;
+#endif
+ struct termios initial_settings;
+ struct termios new_settings;
+ char read_key_buffer[KEYCODE_BUFFER_SIZE];
+
+ INIT_S();
+
+ if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
+ || !(initial_settings.c_lflag & ECHO)
+ ) {
+ /* Happens when e.g. stty -echo was run before */
+ parse_and_put_prompt(prompt);
+ /* fflush_all(); - done by parse_and_put_prompt */
+ if (fgets(command, maxsize, stdin) == NULL)
+ len = -1; /* EOF or error */
+ else
+ len = strlen(command);
+ DEINIT_S();
+ return len;
+ }
+
+ init_unicode();
+
+// FIXME: audit & improve this
+ if (maxsize > MAX_LINELEN)
+ maxsize = MAX_LINELEN;
+ S.maxsize = maxsize;
+
+ /* With zero flags, no other fields are ever used */
+ state = st ? st : (line_input_t*) &const_int_0;
+#if MAX_HISTORY > 0
+# if ENABLE_FEATURE_EDITING_SAVEHISTORY
+ if (state->hist_file)
+ if (state->cnt_history == 0)
+ load_history(state);
+# endif
+ if (state->flags & DO_HISTORY)
+ state->cur_history = state->cnt_history;
+#endif
+
+ /* prepare before init handlers */
+ cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
+ command_len = 0;
+#if ENABLE_UNICODE_SUPPORT
+ command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
+#else
+ command_ps = command;
+ command[0] = '\0';
+#endif
+#define command command_must_not_be_used
+
+ new_settings = initial_settings;
+ /* ~ICANON: unbuffered input (most c_cc[] are disabled, VMIN/VTIME are enabled) */
+ /* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */
+ /* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */
+ new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG);
+ /* reads would block only if < 1 char is available */
+ new_settings.c_cc[VMIN] = 1;
+ /* no timeout (reads block forever) */
+ new_settings.c_cc[VTIME] = 0;
+ /* Should be not needed if ISIG is off: */
+ /* Turn off CTRL-C */
+ /* new_settings.c_cc[VINTR] = _POSIX_VDISABLE; */
+ tcsetattr_stdin_TCSANOW(&new_settings);
+
+#if ENABLE_USERNAME_OR_HOMEDIR
+ {
+ struct passwd *entry;
+
+ entry = getpwuid(geteuid());
+ if (entry) {
+ user_buf = xstrdup(entry->pw_name);
+ home_pwd_buf = xstrdup(entry->pw_dir);
+ }
+ }
+#endif
+
+#if 0
+ for (i = 0; i <= state->max_history; i++)
+ bb_error_msg("history[%d]:'%s'", i, state->history[i]);
+ bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
+#endif
+
+ /* Print out the command prompt, optionally ask where cursor is */
+ parse_and_put_prompt(prompt);
+ ask_terminal();
+
+ /* Install window resize handler (NB: after *all* init is complete) */
+//FIXME: save entire sigaction!
+ previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
+ win_changed(0); /* get initial window size */
+
+ read_key_buffer[0] = 0;
+ while (1) {
+ /*
+ * 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.
+ */
+ int32_t ic, ic_raw;
+
+ fflush_all();
+ ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
+
+#if ENABLE_FEATURE_REVERSE_SEARCH
+ again:
+#endif
+#if ENABLE_FEATURE_EDITING_VI
+ newdelflag = 1;
+ if (vi_cmdmode) {
+ /* btw, since KEYCODE_xxx are all < 0, this doesn't
+ * change ic if it contains one of them: */
+ ic |= VI_CMDMODE_BIT;
+ }
+#endif
+
+ switch (ic) {
+ case '\n':
+ case '\r':
+ vi_case('\n'|VI_CMDMODE_BIT:)
+ vi_case('\r'|VI_CMDMODE_BIT:)
+ /* Enter */
+ goto_new_line();
+ break_out = 1;
+ break;
+ case CTRL('A'):
+ vi_case('0'|VI_CMDMODE_BIT:)
+ /* Control-a -- Beginning of line */
+ input_backward(cursor);
+ break;
+ case CTRL('B'):
+ vi_case('h'|VI_CMDMODE_BIT:)
+ vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
+ vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
+ input_backward(1); /* Move back one character */
+ break;
+ case CTRL('E'):
+ vi_case('$'|VI_CMDMODE_BIT:)
+ /* Control-e -- End of line */
+ put_till_end_and_adv_cursor();
+ break;
+ case CTRL('F'):
+ vi_case('l'|VI_CMDMODE_BIT:)
+ vi_case(' '|VI_CMDMODE_BIT:)
+ input_forward(); /* Move forward one character */
+ break;
+ case '\b': /* ^H */
+ case '\x7f': /* DEL */
+ if (!isrtl_str())
+ input_backspace();
+ else
+ input_delete(0);
+ break;
+ case KEYCODE_DELETE:
+ if (!isrtl_str())
+ input_delete(0);
+ else
+ input_backspace();
+ break;
+#if ENABLE_FEATURE_TAB_COMPLETION
+ case '\t':
+ input_tab(&lastWasTab);
+ break;
+#endif
+ case CTRL('K'):
+ /* Control-k -- clear to end of line */
+ command_ps[cursor] = BB_NUL;
+ command_len = cursor;
+ printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
+ break;
+ case CTRL('L'):
+ vi_case(CTRL('L')|VI_CMDMODE_BIT:)
+ /* Control-l -- clear screen */
+ printf(ESC"[H"); /* cursor to top,left */
+ redraw(0, command_len - cursor);
+ break;
+#if MAX_HISTORY > 0
+ case CTRL('N'):
+ vi_case(CTRL('N')|VI_CMDMODE_BIT:)
+ vi_case('j'|VI_CMDMODE_BIT:)
+ /* Control-n -- Get next command in history */
+ if (get_next_history())
+ goto rewrite_line;
+ break;
+ case CTRL('P'):
+ vi_case(CTRL('P')|VI_CMDMODE_BIT:)
+ vi_case('k'|VI_CMDMODE_BIT:)
+ /* Control-p -- Get previous command from history */
+ if (get_previous_history())
+ goto rewrite_line;
+ break;
+#endif
+ case CTRL('U'):
+ vi_case(CTRL('U')|VI_CMDMODE_BIT:)
+ /* Control-U -- Clear line before cursor */
+ if (cursor) {
+ command_len -= cursor;
+ memmove(command_ps, command_ps + cursor,
+ (command_len + 1) * sizeof(command_ps[0]));
+ redraw(cmdedit_y, command_len);
+ }
+ break;
+ case CTRL('W'):
+ vi_case(CTRL('W')|VI_CMDMODE_BIT:)
+ /* Control-W -- Remove the last word */
+ while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
+ input_backspace();
+ while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
+ input_backspace();
+ break;
+#if ENABLE_FEATURE_REVERSE_SEARCH
+ case CTRL('R'):
+ ic = ic_raw = reverse_i_search();
+ goto again;
+#endif
+
+#if ENABLE_FEATURE_EDITING_VI
+ case 'i'|VI_CMDMODE_BIT:
+ vi_cmdmode = 0;
+ break;
+ case 'I'|VI_CMDMODE_BIT:
+ input_backward(cursor);
+ vi_cmdmode = 0;
+ break;
+ case 'a'|VI_CMDMODE_BIT:
+ input_forward();
+ vi_cmdmode = 0;
+ break;
+ case 'A'|VI_CMDMODE_BIT:
+ put_till_end_and_adv_cursor();
+ vi_cmdmode = 0;
+ break;
+ case 'x'|VI_CMDMODE_BIT:
+ input_delete(1);
+ break;
+ case 'X'|VI_CMDMODE_BIT:
+ if (cursor > 0) {
+ input_backward(1);
+ input_delete(1);
+ }
+ break;
+ case 'W'|VI_CMDMODE_BIT:
+ vi_Word_motion(1);
+ break;
+ case 'w'|VI_CMDMODE_BIT:
+ vi_word_motion(1);
+ break;
+ case 'E'|VI_CMDMODE_BIT:
+ vi_End_motion();
+ break;
+ case 'e'|VI_CMDMODE_BIT:
+ vi_end_motion();
+ break;
+ case 'B'|VI_CMDMODE_BIT:
+ vi_Back_motion();
+ break;
+ case 'b'|VI_CMDMODE_BIT:
+ vi_back_motion();
+ break;
+ case 'C'|VI_CMDMODE_BIT:
+ vi_cmdmode = 0;
+ /* fall through */
+ case 'D'|VI_CMDMODE_BIT:
+ goto clear_to_eol;
+
+ case 'c'|VI_CMDMODE_BIT:
+ vi_cmdmode = 0;
+ /* fall through */
+ case 'd'|VI_CMDMODE_BIT: {
+ int nc, sc;
+
+ ic = lineedit_read_key(read_key_buffer, timeout);
+ if (errno) /* error */
+ goto return_error_indicator;
+ if (ic == ic_raw) { /* "cc", "dd" */
+ input_backward(cursor);
+ goto clear_to_eol;
+ break;
+ }
+
+ sc = cursor;
+ switch (ic) {
+ case 'w':
+ case 'W':
+ case 'e':
+ case 'E':
+ switch (ic) {
+ case 'w': /* "dw", "cw" */
+ vi_word_motion(vi_cmdmode);
+ break;
+ case 'W': /* 'dW', 'cW' */
+ vi_Word_motion(vi_cmdmode);
+ break;
+ case 'e': /* 'de', 'ce' */
+ vi_end_motion();
+ input_forward();
+ break;
+ case 'E': /* 'dE', 'cE' */
+ vi_End_motion();
+ 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 (ic == 'b')
+ vi_back_motion();
+ else
+ vi_Back_motion();
+ 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'|VI_CMDMODE_BIT:
+ input_forward();
+ /* fallthrough */
+ case 'P'|VI_CMDMODE_BIT:
+ put();
+ break;
+ case 'r'|VI_CMDMODE_BIT:
+//FIXME: unicode case?
+ ic = lineedit_read_key(read_key_buffer, timeout);
+ if (errno) /* error */
+ goto return_error_indicator;
+ if (ic < ' ' || ic > 255) {
+ beep();
+ } else {
+ command_ps[cursor] = ic;
+ bb_putchar(ic);
+ bb_putchar('\b');
+ }
+ break;
+ case '\x1b': /* ESC */
+ if (state->flags & VI_MODE) {
+ /* insert mode --> command mode */
+ vi_cmdmode = 1;
+ input_backward(1);
+ }
+ /* Handle a few ESC-<key> combinations the same way
+ * standard readline bindings (IOW: bash) do.
+ * Often, Alt-<key> generates ESC-<key>.
+ */
+ ic = lineedit_read_key(read_key_buffer, timeout);
+ switch (ic) {
+ //case KEYCODE_LEFT: - bash doesn't do this
+ case 'b':
+ ctrl_left();
+ break;
+ //case KEYCODE_RIGHT: - bash doesn't do this
+ case 'f':
+ ctrl_right();
+ break;
+ //case KEYCODE_DELETE: - bash doesn't do this
+ case 'd': /* Alt-D */
+ {
+ /* Delete word forward */
+ int nc, sc = cursor;
+ ctrl_right();
+ nc = cursor - sc;
+ input_backward(nc);
+ while (--nc >= 0)
+ input_delete(1);
+ break;
+ }
+ case '\b': /* Alt-Backspace(?) */
+ case '\x7f': /* Alt-Backspace(?) */
+ //case 'w': - bash doesn't do this
+ {
+ /* Delete word backward */
+ int sc = cursor;
+ ctrl_left();
+ while (sc-- > cursor)
+ input_delete(1);
+ break;
+ }
+ }
+ break;
+#endif /* FEATURE_COMMAND_EDITING_VI */
+
+#if MAX_HISTORY > 0
+ case KEYCODE_UP:
+ if (get_previous_history())
+ goto rewrite_line;
+ beep();
+ break;
+ case KEYCODE_DOWN:
+ if (!get_next_history())
+ break;
+ rewrite_line:
+ /* Rewrite the line with the selected history item */
+ /* change command */
+ command_len = load_string(state->history[state->cur_history] ?
+ 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 KEYCODE_RIGHT:
+ input_forward();
+ break;
+ case KEYCODE_LEFT:
+ input_backward(1);
+ break;
+ case KEYCODE_CTRL_LEFT:
+ case KEYCODE_ALT_LEFT: /* bash doesn't do it */
+ ctrl_left();
+ break;
+ case KEYCODE_CTRL_RIGHT:
+ case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
+ ctrl_right();
+ break;
+ case KEYCODE_HOME:
+ input_backward(cursor);
+ break;
+ case KEYCODE_END:
+ put_till_end_and_adv_cursor();
+ break;
+
+ default:
+ if (initial_settings.c_cc[VINTR] != 0
+ && ic_raw == initial_settings.c_cc[VINTR]
+ ) {
+ /* Ctrl-C (usually) - stop gathering input */
+ goto_new_line();
+ command_len = 0;
+ break_out = -1; /* "do not append '\n'" */
+ break;
+ }
+ if (initial_settings.c_cc[VEOF] != 0
+ && ic_raw == initial_settings.c_cc[VEOF]
+ ) {
+ /* Ctrl-D (usually) - delete one character,
+ * or exit if len=0 and no chars to delete */
+ if (command_len == 0) {
+ errno = 0;
+
+ case -1: /* error (e.g. EIO when tty is destroyed) */
+ IF_FEATURE_EDITING_VI(return_error_indicator:)
+ break_out = command_len = -1;
+ break;
+ }
+ input_delete(0);
+ break;
+ }
+// /* Control-V -- force insert of next char */
+// if (c == CTRL('V')) {
+// if (safe_read(STDIN_FILENO, &c, 1) < 1)
+// goto return_error_indicator;
+// if (c == 0) {
+// beep();
+// break;
+// }
+// }
+ if (ic < ' '
+ || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
+ || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
+ ) {
+ /* If VI_CMDMODE_BIT is set, ic is >= 256
+ * and vi mode ignores unexpected chars.
+ * Otherwise, we are here if ic is a
+ * control char or an unhandled ESC sequence,
+ * which is also ignored.
+ */
+ break;
+ }
+ if ((int)command_len >= (maxsize - 2)) {
+ /* Not enough space for the char and EOL */
+ break;
+ }
+
+ command_len++;
+ if (cursor == (command_len - 1)) {
+ /* We are at the end, append */
+ command_ps[cursor] = ic;
+ command_ps[cursor + 1] = BB_NUL;
+ put_cur_glyph_and_inc_cursor();
+ if (unicode_bidi_isrtl(ic))
+ input_backward(1);
+ } else {
+ /* In the middle, insert */
+ int sc = cursor;
+
+ memmove(command_ps + sc + 1, command_ps + sc,
+ (command_len - sc) * sizeof(command_ps[0]));
+ command_ps[sc] = ic;
+ /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
+ if (!isrtl_str())
+ sc++; /* no */
+ put_till_end_and_adv_cursor();
+ /* to prev x pos + 1 */
+ input_backward(cursor - sc);
+ }
+ break;
+ } /* switch (ic) */
+
+ if (break_out)
+ break;
+
+#if ENABLE_FEATURE_TAB_COMPLETION
+ if (ic_raw != '\t')
+ lastWasTab = 0;
+#endif
+ } /* while (1) */
+
+#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
+ if (S.sent_ESC_br6n) {
+ /* "sleep 1; busybox ash" + hold [Enter] to trigger.
+ * We sent "ESC [ 6 n", but got '\n' first, and
+ * KEYCODE_CURSOR_POS response is now buffered from terminal.
+ * It's bad already and not much can be done with it
+ * (it _will_ be visible for the next process to read stdin),
+ * but without this delay it even shows up on the screen
+ * as garbage because we restore echo settings with tcsetattr
+ * before it comes in. UGLY!
+ */
+ usleep(20*1000);
+ }
+#endif
+
+/* End of bug-catching "command_must_not_be_used" trick */
+#undef command
+
+#if ENABLE_UNICODE_SUPPORT
+ command[0] = '\0';
+ if (command_len > 0)
+ command_len = save_string(command, maxsize - 1);
+ free(command_ps);
+#endif
+
+ if (command_len > 0)
+ remember_in_history(command);
+
+ if (break_out > 0) {
+ command[command_len++] = '\n';
+ command[command_len] = '\0';
+ }
+
+#if ENABLE_FEATURE_TAB_COMPLETION
+ free_tab_completion_data();
+#endif
+
+ /* restore initial_settings */
+ tcsetattr_stdin_TCSANOW(&initial_settings);
+ /* restore SIGWINCH handler */
+ signal(SIGWINCH, previous_SIGWINCH_handler);
+ fflush_all();
+
+ len = command_len;
+ DEINIT_S();
+
+ return len; /* can't return command_len, DEINIT_S() destroys it */
+}
+
+#else /* !FEATURE_EDITING */
+
+#undef read_line_input
+int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
+{
+ fputs(prompt, stdout);
+ fflush_all();
+ if (!fgets(command, maxsize, stdin))
+ return -1;
+ return strlen(command);
+}
+
+#endif /* !FEATURE_EDITING */
+
+
+/*
+ * Testing
+ */
+
+#ifdef TEST
+
+#include <locale.h>
+
+const char *applet_name = "debug stuff usage";
+
+int main(int argc, char **argv)
+{
+ char buff[MAX_LINELEN];
+ 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
+
+ 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 */