/* vi: set sw=4 ts=4: */ /* * Termios command line History and Editing. * * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license. * Written by: Vladimir Oleynik * * Used ideas: * Adam Rogoyski * Dave Cinege * Jakub Jelinek (c) 1995 * Erik Andersen (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_FEATURE_GETUSERNAME_AND_HOMEDIR \ (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT) #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR #undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__ #endif #define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J" //#define SEQ_CLEAR_TILL_END_OF_LINE "\033[K" #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 enum { /* We use int16_t for positions, need to limit line len */ MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0 ? CONFIG_FEATURE_EDITING_MAX_LEN : 0x7ff0 }; #if ENABLE_FEATURE_GETUSERNAME_AND_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_FEATURE_GETUSERNAME_AND_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 /* Formerly these were big buffers on stack: */ #if ENABLE_FEATURE_TAB_COMPLETION char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN]; char input_tab__matchBuf[MAX_LINELEN]; int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */ int16_t find_match__pos_buf[MAX_LINELEN + 1]; #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_FEATURE_GETUSERNAME_AND_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_FEATURE_GETUSERNAME_AND_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) { ssize_t len = mbstowcs(command_ps, src, maxsize - 1); if (len < 0) len = 0; command_ps[len] = 0; return len; } static unsigned save_string(char *dst, unsigned maxsize) { # 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; while ((wc = command_ps[srcpos]) != 0 && !unicode_is_raw_byte(wc) ) { srcpos++; } command_ps[srcpos] = 0; n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos); if (n < 0) /* should not happen */ break; dstpos += n; if (wc == 0) /* 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 } /* I thought just fputwc(c, stdout) would work. But no... */ static void BB_PUTCHAR(wchar_t c) { char buf[MB_CUR_MAX + 1]; mbstate_t mbst = { 0 }; ssize_t len; len = wcrtomb(buf, c, &mbst); if (len > 0) { buf[len] = '\0'; fputs(buf, stdout); } } # 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("\033[%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" "\033[%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" "\033[%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("\033[%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("\033[%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 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 static void username_tab_completion(char *ud, char *with_shash_flg) { struct passwd *entry; int userlen; ud++; /* ~user/... to user/... */ userlen = strlen(ud); if (with_shash_flg) { /* "~/..." or "~user/..." */ char *sav_ud = ud - 1; char *home = NULL; if (*ud == '/') { /* "~/..." */ home = home_pwd_buf; } else { /* "~user/..." */ char *temp; temp = strchr(ud, '/'); *temp = '\0'; /* ~user\0 */ entry = getpwnam(ud); *temp = '/'; /* restore ~user/... */ ud = temp; if (entry) home = entry->pw_dir; } if (home) { if ((userlen + strlen(home) + 1) < MAX_LINELEN) { /* /home/user/... */ sprintf(sav_ud, "%s%s", home, ud); } } } else { /* "~[^/]*" */ /* Using _r function to avoid pulling in static buffers */ char line_buff[256]; struct passwd pwd; struct passwd *result; 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(); } } #endif /* FEATURE_COMMAND_USERNAME_COMPLETION */ enum { FIND_EXE_ONLY = 0, FIND_DIR_ONLY = 1, FIND_FILE_ONLY = 2, }; static int path_parse(char ***p, int flags) { int npth; const char *pth; char *tmp; char **res; /* if not setenv PATH variable, to search cur dir "." */ if (flags != FIND_EXE_ONLY) return 1; if (state->flags & WITH_PATH_LOOKUP) pth = state->path_lookup; else pth = getenv("PATH"); /* PATH= 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; if (*++tmp == '\0') break; /* : */ npth++; } res = xmalloc(npth * sizeof(char*)); res[0] = tmp = xstrdup(pth); npth = 1; while (1) { tmp = strchr(tmp, ':'); if (!tmp) break; *tmp++ = '\0'; /* ':' -> '\0' */ if (*tmp == '\0') break; /* : */ res[npth++] = tmp; } *p = res; return npth; } static void exe_n_cwd_tab_completion(char *command, int type) { DIR *dir; struct dirent *next; struct stat st; char *path1[1]; char **paths = path1; int npaths; int i; char *found; char *pfind = strrchr(command, '/'); /* char dirbuf[MAX_LINELEN]; */ #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf) npaths = 1; path1[0] = (char*)"."; if (pfind == NULL) { /* no dir, if flags==EXE_ONLY - get paths, else "." */ npaths = path_parse(&paths, type); pfind = command; } else { /* dirbuf = ".../.../.../" */ safe_strncpy(dirbuf, command, (pfind - command) + 2); #if ENABLE_FEATURE_USERNAME_COMPLETION if (dirbuf[0] == '~') /* ~/... or ~user/... */ username_tab_completion(dirbuf, dirbuf); #endif paths[0] = dirbuf; /* point to 'l' in "..../last_component" */ pfind++; } for (i = 0; i < npaths; i++) { dir = opendir(paths[i]); if (!dir) continue; /* don't print an error */ while ((next = readdir(dir)) != NULL) { int len1; const char *str_found = next->d_name; /* matched? */ if (strncmp(str_found, pfind, strlen(pfind))) continue; /* not see .name without .match */ if (*str_found == '.' && *pfind == '\0') { if (NOT_LONE_CHAR(paths[i], '/') || str_found[1]) continue; str_found = ""; /* only "/" */ } found = concat_path_file(paths[i], str_found); /* hmm, remove in progress? */ /* 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; /* find with dirs? */ if (paths[i] != dirbuf) strcpy(found, next->d_name); /* only name */ len1 = strlen(found); found = xrealloc(found, len1 + 2); found[len1] = '\0'; found[len1+1] = '\0'; if (S_ISDIR(st.st_mode)) { /* name is a directory */ if (found[len1-1] != '/') { found[len1] = '/'; } } else { /* not put found file if search only dirs for cd */ if (type == FIND_DIR_ONLY) goto cont; } /* Add it to the list */ add_match(found); continue; cont: free(found); } closedir(dir); } if (paths != path1) { free(paths[0]); /* allocated memory is only in first member */ free(paths); } #undef dirbuf } /* 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) #define int_buf (S.find_match__int_buf) #define pos_buf (S.find_match__pos_buf) /* is must be <= in */ static void collapse_pos(int is, int in) { memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0])); memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0])); } static NOINLINE int find_match(char *matchBuf, int *len_with_quotes) { int i, j; int command_mode; int c, c2; /* Were local, but it uses too much stack */ /* int16_t int_buf[MAX_LINELEN + 1]; */ /* int16_t pos_buf[MAX_LINELEN + 1]; */ /* set to integer dimension characters and own positions */ for (i = 0;; i++) { int_buf[i] = (unsigned char)matchBuf[i]; if (int_buf[i] == 0) { pos_buf[i] = -1; /* end-fo-line indicator */ break; } pos_buf[i] = i; } /* mask \+symbol and convert '\t' to ' ' */ for (i = j = 0; matchBuf[i]; i++, j++) { if (matchBuf[i] == '\\') { collapse_pos(j, j + 1); int_buf[j] |= QUOT; i++; } } /* mask "symbols" or 'symbols' */ c2 = 0; for (i = 0; int_buf[i]; i++) { c = int_buf[i]; if (c == '\'' || c == '"') { if (c2 == 0) c2 = c; else { if (c == c2) c2 = 0; else int_buf[i] |= QUOT; } } else if (c2 != 0 && c != '$') int_buf[i] |= QUOT; } /* skip commands with arguments if line has commands delimiters */ /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */ for (i = 0; int_buf[i]; i++) { c = int_buf[i]; c2 = int_buf[i + 1]; j = i ? int_buf[i - 1] : -1; command_mode = 0; if (c == ';' || c == '&' || c == '|') { command_mode = 1 + (c == c2); if (c == '&') { if (j == '>' || j == '<') command_mode = 0; } else if (c == '|' && j == '>') command_mode = 0; } if (command_mode) { collapse_pos(0, i + command_mode); i = -1; /* hack incremet */ } } /* collapse `command...` */ for (i = 0; int_buf[i]; i++) { if (int_buf[i] == '`') { for (j = i + 1; int_buf[j]; j++) if (int_buf[j] == '`') { collapse_pos(i, j + 1); j = 0; break; } if (j) { /* not found closing ` - command mode, collapse all previous */ collapse_pos(0, i + 1); break; } else i--; /* hack incremet */ } } /* collapse (command...(command...)...) or {command...{command...}...} */ c = 0; /* "recursive" level */ c2 = 0; for (i = 0; int_buf[i]; i++) { if (int_buf[i] == '(' || int_buf[i] == '{') { if (int_buf[i] == '(') c++; else c2++; collapse_pos(0, i + 1); i = -1; /* hack incremet */ } } for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) { if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) { if (int_buf[i] == ')') c--; else c2--; collapse_pos(0, i + 1); i = -1; /* hack incremet */ } } /* skip first not quote space */ for (i = 0; int_buf[i]; i++) if (int_buf[i] != ' ') break; if (i) collapse_pos(0, i); /* set find mode for completion */ command_mode = FIND_EXE_ONLY; for (i = 0; int_buf[i]; i++) { if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') { if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY && matchBuf[pos_buf[0]] == 'c' && matchBuf[pos_buf[1]] == 'd' ) { command_mode = FIND_DIR_ONLY; } else { command_mode = FIND_FILE_ONLY; break; } } } for (i = 0; int_buf[i]; i++) /* "strlen" */; /* find last word */ for (--i; i >= 0; i--) { c = int_buf[i]; if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') { collapse_pos(0, i + 1); break; } } /* skip first not quoted '\'' or '"' */ for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++) /*skip*/; /* collapse quote or unquote // or /~ */ while ((int_buf[i] & ~QUOT) == '/' && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~') ) { i++; } /* set only match and destroy quotes */ j = 0; for (c = 0; pos_buf[i] >= 0; i++) { matchBuf[c++] = matchBuf[pos_buf[i]]; j = pos_buf[i] + 1; } matchBuf[c] = '\0'; /* old length matchBuf with quotes symbols */ *len_with_quotes = j ? j - pos_buf[0] : 0; return command_mode; } #undef int_buf #undef pos_buf /* * display by column (original idea from ls applet, * very optimized by me :) */ static void showfiles(void) { int ncols, row; int column_width = 0; int nfiles = num_matches; int nrows = nfiles; int l; /* find the longest file name - use that as the column width */ for (row = 0; row < nrows; row++) { l = 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 char *add_quote_for_spec_chars(char *found) { int l = 0; char *s = xzalloc((strlen(found) + 1) * 2); while (*found) { if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found)) s[l++] = '\\'; s[l++] = *found++; } /* s[l] = '\0'; - already is */ return s; } /* Do TAB completion */ static void input_tab(smallint *lastWasTab) { if (!(state->flags & TAB_COMPLETION)) return; if (!*lastWasTab) { char *tmp, *tmp1; size_t len_found; /* char matchBuf[MAX_LINELEN]; */ #define matchBuf (S.input_tab__matchBuf) int find_type; int recalc_pos; #if ENABLE_UNICODE_SUPPORT /* cursor pos in command converted to multibyte form */ int cursor_mb; #endif *lastWasTab = TRUE; /* flop trigger */ /* Make a local copy of the string -- * up to the position of the cursor */ save_string(matchBuf, cursor + 1); #if ENABLE_UNICODE_SUPPORT cursor_mb = strlen(matchBuf); #endif tmp = matchBuf; find_type = find_match(matchBuf, &recalc_pos); /* Free up any memory already allocated */ free_tab_completion_data(); #if ENABLE_FEATURE_USERNAME_COMPLETION /* If the word starts with `~' and there is no slash in the word, * then try completing this word as a username. */ if (state->flags & USERNAME_COMPLETION) if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL) username_tab_completion(matchBuf, NULL); #endif /* Try to match any executable in our path and everything * in the current working directory */ if (!matches) exe_n_cwd_tab_completion(matchBuf, find_type); /* Sort, then remove any duplicates found */ if (matches) { unsigned i; int 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 + 1; } /* Did we find exactly one match? */ if (!matches || num_matches > 1) { /* no */ beep(); if (!matches) return; /* not found */ /* find minimal match */ tmp1 = xstrdup(matches[0]); for (tmp = tmp1; *tmp; tmp++) { for (len_found = 1; len_found < num_matches; len_found++) { if (matches[len_found][tmp - tmp1] != *tmp) { *tmp = '\0'; break; } } } if (*tmp1 == '\0') { /* have unique */ free(tmp1); return; } tmp = add_quote_for_spec_chars(tmp1); free(tmp1); } else { /* one match */ tmp = add_quote_for_spec_chars(matches[0]); /* for next completion current found */ *lastWasTab = FALSE; len_found = strlen(tmp); if (tmp[len_found-1] != '/') { tmp[len_found] = ' '; tmp[len_found+1] = '\0'; } } len_found = strlen(tmp); #if !ENABLE_UNICODE_SUPPORT /* have space to place the match? */ /* The result consists of three parts with these lengths: */ /* (cursor - recalc_pos) + len_found + (command_len - cursor) */ /* it simplifies into: */ if ((int)(len_found + command_len - recalc_pos) < S.maxsize) { /* save tail */ strcpy(matchBuf, command_ps + cursor); /* add match and tail */ sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf); command_len = strlen(command_ps); /* new pos */ recalc_pos = cursor - recalc_pos + len_found; /* write out the matched command */ redraw(cmdedit_y, command_len - recalc_pos); } #else { char command[MAX_LINELEN]; int len = save_string(command, sizeof(command)); /* have space to place the match? */ /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */ if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) { /* save tail */ strcpy(matchBuf, command + cursor_mb); /* where do we want to have cursor after all? */ strcpy(&command[cursor_mb - recalc_pos], tmp); len = load_string(command, S.maxsize); /* add match and tail */ sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf); command_len = load_string(command, S.maxsize); /* write out the matched command */ redraw(cmdedit_y, command_len - len); } } #endif free(tmp); #undef matchBuf } else { /* Ok -- the last char was a TAB. Since they * just hit TAB again, print a list of all the * available choices... */ if (matches && num_matches > 0) { /* changed by goto_new_line() */ int sav_cursor = cursor; /* Go to the next line */ goto_new_line(); showfiles(); redraw(0, command_len - sav_cursor); } } } #endif /* FEATURE_COMMAND_TAB_COMPLETION */ line_input_t* FAST_FUNC new_line_input_t(int flags) { line_input_t *n = xzalloc(sizeof(*n)); n->flags = flags; return n; } #if MAX_HISTORY > 0 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 == 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 == MAX_HISTORY) idx = 0; } } /* copy temp_h[] to st_parm->history[] */ for (i = 0; i < MAX_HISTORY;) { line = temp_h[idx]; if (!line) break; idx++; if (idx == 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, 0666); 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 > MAX_HISTORY * 4) { FILE *fp; char *new_name; line_input_t *st_temp; int i; /* 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; load_history(st_temp); /* write out temp file and replace hist_file atomically */ new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid()); fp = fopen_for_write(new_name); if (fp) { 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[MAX_HISTORY]); /* redundant, paranoia */ state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */ /* If history[] is full, remove the oldest command */ /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */ if (i >= MAX_HISTORY) { free(state->history[0]); for (i = 0; i < MAX_HISTORY-1; i++) state->history[i] = state->history[i+1]; /* i == MAX_HISTORY-1 */ } /* i <= MAX_HISTORY-1 */ state->history[i++] = xstrdup(str); /* i <= 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 */ 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- */ 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("\033" "[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_FEATURE_GETUSERNAME_AND_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_FEATURE_GETUSERNAME_AND_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) { 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 */ } static int lineedit_read_key(char *read_key_buffer) { int64_t ic; int timeout = -1; #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,: 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(const char *prompt, char *command, int maxsize, line_input_t *st) { int len; #if ENABLE_FEATURE_TAB_COMPLETION smallint lastWasTab = FALSE; #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 null 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); /* Now initialize things */ previous_SIGWINCH_handler = signal(SIGWINCH, win_changed); win_changed(0); /* do initial resizing */ #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR { struct passwd *entry; entry = getpwuid(geteuid()); if (entry) { user_buf = xstrdup(entry->pw_name); home_pwd_buf = xstrdup(entry->pw_dir); } } #endif #if 0 for (i = 0; i <= 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); #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("\033[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); if (errno) /* error */ goto prepare_to_die; 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); if (errno) /* error */ goto prepare_to_die; 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; #if ENABLE_FEATURE_EDITING_VI prepare_to_die: #endif 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 prepare_to_die; // 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 = FALSE; #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 /* Stop bug catching using "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 #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 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 */