/* 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" #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, int maxsize) { if (unicode_status == UNICODE_ON) { ssize_t len = mbstowcs(command_ps, src, maxsize - 1); if (len < 0) len = 0; command_ps[len] = BB_NUL; return len; } else { unsigned i = 0; while ((command_ps[i] = src[i]) != 0) i++; 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, int maxsize) { safe_strncpy(command_ps, src, 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) { 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, S.maxsize); /* add match and tail */ sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf); command_len = load_string(command, S.maxsize); /* 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)); st_parm->cnt_history_in_file = idx = 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; } } /* state->flags is already checked to be nonzero */ static void save_history(char *str) { int fd; int len, len2; 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(state->hist_file, 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); } } # 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 */ } /* i <= state->max_history-1 */ state->history[i++] = xstrdup(str); /* i <= state->max_history */ state->cur_history = i; state->cnt_history = i; # if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY if ((state->flags & SAVE_HISTORY) && state->hist_file) 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, 4294967295) = 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); cmdedit_setwidth(width, nsig /* - just a yes/no flag */); if (nsig == SIGWINCH) signal(SIGWINCH, win_changed); /* rearm ourself */ 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) /* 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->flags & SAVE_HISTORY) && 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; 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; tcsetattr_stdin_TCSANOW(&new_settings); previous_SIGWINCH_handler = signal(SIGWINCH, win_changed); win_changed(0); /* do initial resizing */ #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(); 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. */ enum { VI_CMDMODE_BIT = 0x40000000, /* 0x80000000 bit flags KEYCODE_xxx */ }; int32_t ic, ic_raw; fflush_all(); ic = ic_raw = lineedit_read_key(read_key_buffer, timeout); #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_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); } 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] : "", maxsize); /* 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: ctrl_left(); break; case KEYCODE_CTRL_RIGHT: 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(); fgets(command, maxsize, stdin); 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 */