/* 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, and more will probably need to be added. This version was created on Debian GNU/Linux 2.x. Delete, Backspace, Home, End, and the arrow keys were tested to work in an Xterm and console. Ctrl-A also works as Home. Ctrl-E also works as End. Small bugs (simple effect): - not true viewing if terminal size (x*y symbols) less size (prompt + editor's line + 2 symbols) - not true viewing if length prompt less terminal width */ #include "libbb.h" /* FIXME: obsolete CONFIG item? */ #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0 #ifdef TEST #define ENABLE_FEATURE_EDITING 0 #define ENABLE_FEATURE_TAB_COMPLETION 0 #define ENABLE_FEATURE_USERNAME_COMPLETION 0 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0 #define ENABLE_FEATURE_CLEAN_UP 0 #endif /* TEST */ /* Entire file (except TESTing part) sits inside this #if */ #if ENABLE_FEATURE_EDITING #if ENABLE_LOCALE_SUPPORT #define Isprint(c) isprint(c) #else #define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233')) #endif #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \ (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT) enum { MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN }; static line_input_t *state; static struct termios initial_settings, new_settings; static volatile unsigned cmdedit_termw = 80; /* actual terminal width */ static int cmdedit_x; /* real x terminal position */ static int cmdedit_y; /* pseudoreal y terminal position */ static int cmdedit_prmt_len; /* length of prompt (without colors etc) */ static unsigned cursor; static unsigned command_len; static char *command_ps; static const char *cmdedit_prompt; #if ENABLE_FEATURE_EDITING_FANCY_PROMPT static char *hostname_buf; static int num_ok_lines = 1; #endif #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR static const char null_str[] = ""; static char *user_buf; static char *home_pwd_buf = (char*)null_str; #endif /* Put 'command_ps[cursor]', cursor++. * Advance cursor on screen. If we reached right margin, scroll text up * and remove terminal margin effect by printing 'next_char' */ static void cmdedit_set_out_char(int next_char) { int c = (unsigned char)command_ps[cursor]; if (c == '\0') { /* erase character after end of input string */ c = ' '; } #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT /* Display non-printable characters in reverse */ if (!Isprint(c)) { if (c >= 128) c -= 128; if (c < ' ') c += '@'; if (c == 127) c = '?'; printf("\033[7m%c\033[0m", c); } else #endif { if (initial_settings.c_lflag & ECHO) putchar(c); } if (++cmdedit_x >= cmdedit_termw) { /* terminal is scrolled down */ cmdedit_y++; cmdedit_x = 0; /* destroy "(auto)margin" */ putchar(next_char); putchar('\b'); } // Huh? What if command_ps[cursor] == '\0' (we are at the end already?) cursor++; } /* Move to end of line (by printing all chars till the end) */ static void input_end(void) { while (cursor < command_len) cmdedit_set_out_char(' '); } /* Go to the next line */ static void goto_new_line(void) { input_end(); if (cmdedit_x) putchar('\n'); } static void out1str(const char *s) { if (s) fputs(s, stdout); } static void beep(void) { putchar('\007'); } /* Move back one character */ /* (optimized for slow terminals) */ static void input_backward(unsigned num) { int count_y; if (num > cursor) num = cursor; if (!num) return; cursor -= num; if (cmdedit_x >= num) { cmdedit_x -= num; if (num <= 4) { printf("\b\b\b\b" + (4-num)); return; } printf("\033[%uD", num); return; } /* Need to go one or more lines up */ num -= cmdedit_x; count_y = 1 + (num / cmdedit_termw); cmdedit_y -= count_y; cmdedit_x = cmdedit_termw * count_y - num; /* go to 1st column; go up; go to correct column */ printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x); } static void put_prompt(void) { out1str(cmdedit_prompt); cmdedit_x = cmdedit_prmt_len; cursor = 0; // Huh? what if cmdedit_prmt_len >= width? cmdedit_y = 0; /* new quasireal y */ } /* draw prompt, editor line, and clear tail */ static void redraw(int y, int back_cursor) { if (y > 0) /* up to start y */ printf("\033[%dA", y); putchar('\r'); put_prompt(); input_end(); /* rewrite */ printf("\033[J"); /* erase after cursor */ input_backward(back_cursor); } #if ENABLE_FEATURE_EDITING_VI #define DELBUFSIZ 128 static char *delbuf; /* a (malloced) place to store deleted characters */ static char *delp; static char newdelflag; /* whether delbuf should be reused yet */ #endif /* Delete the char in front of the cursor, optionally saving it * for later putback */ static void input_delete(int save) { int j = cursor; if (j == command_len) return; #if ENABLE_FEATURE_EDITING_VI if (save) { if (newdelflag) { if (!delbuf) delbuf = malloc(DELBUFSIZ); /* safe if malloc fails */ delp = delbuf; newdelflag = 0; } if (delbuf && (delp - delbuf < DELBUFSIZ)) *delp++ = command_ps[j]; } #endif strcpy(command_ps + j, command_ps + j + 1); command_len--; input_end(); /* rewrite new line */ cmdedit_set_out_char(' '); /* erase char */ input_backward(cursor - j); /* back to old pos cursor */ } #if ENABLE_FEATURE_EDITING_VI static void put(void) { int ocursor; int j = delp - delbuf; if (j == 0) return; ocursor = cursor; /* open hole and then fill it */ memmove(command_ps + cursor + j, command_ps + cursor, command_len - cursor + 1); strncpy(command_ps + cursor, delbuf, j); command_len += j; input_end(); /* rewrite new line */ input_backward(cursor - ocursor - j + 1); /* at end of new text */ } #endif /* Delete the char in back of the cursor */ static void input_backspace(void) { if (cursor > 0) { input_backward(1); input_delete(0); } } /* Move forward one character */ static void input_forward(void) { if (cursor < command_len) cmdedit_set_out_char(command_ps[cursor + 1]); } #if ENABLE_FEATURE_TAB_COMPLETION static char **matches; static unsigned num_matches; static void free_tab_completion_data(void) { if (matches) { while (num_matches) free(matches[--num_matches]); free(matches); matches = NULL; } } static void add_match(char *matched) { int nm = num_matches; int nm1 = nm + 1; matches = xrealloc(matches, nm1 * sizeof(char *)); matches[nm] = matched; num_matches++; } #if ENABLE_FEATURE_USERNAME_COMPLETION static void username_tab_completion(char *ud, char *with_shash_flg) { struct passwd *entry; int userlen; ud++; /* ~user/... to user/... */ userlen = strlen(ud); if (with_shash_flg) { /* "~/..." or "~user/..." */ char *sav_ud = ud - 1; char *home = NULL; char *temp; if (*ud == '/') { /* "~/..." */ home = home_pwd_buf; } else { /* "~user/..." */ temp = strchr(ud, '/'); *temp = 0; /* ~user\0 */ entry = getpwnam(ud); *temp = '/'; /* restore ~user/... */ ud = temp; if (entry) home = entry->pw_dir; } if (home) { if ((userlen + strlen(home) + 1) < MAX_LINELEN) { char temp2[MAX_LINELEN]; /* argument size */ /* /home/user/... */ sprintf(temp2, "%s%s", home, ud); strcpy(sav_ud, temp2); } } } 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; char dirbuf[MAX_LINELEN]; struct stat st; char *path1[1]; char **paths = path1; int npaths; int i; char *found; char *pfind = strrchr(command, '/'); 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) /* Don't print an error */ continue; 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, remover in progress? */ if (stat(found, &st) < 0) goto cont; /* find with dirs? */ if (paths[i] != dirbuf) strcpy(found, next->d_name); /* only name */ len1 = strlen(found); found = xrealloc(found, len1 + 2); found[len1] = '\0'; found[len1+1] = '\0'; if (S_ISDIR(st.st_mode)) { /* name is directory */ if (found[len1-1] != '/') { found[len1] = '/'; } } else { /* not put found file if search only dirs for cd */ if (type == FIND_DIR_ONLY) goto cont; } /* Add it to the list */ add_match(found); continue; cont: free(found); } closedir(dir); } if (paths != path1) { free(paths[0]); /* allocated memory only in first member */ free(paths); } } #define QUOT (UCHAR_MAX+1) #define collapse_pos(is, in) { \ memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); \ memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); } static int find_match(char *matchBuf, int *len_with_quotes) { int i, j; int command_mode; int c, c2; int int_buf[MAX_LINELEN + 1]; int 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; /* indicator end line */ break; } pos_buf[i] = i; } /* mask \+symbol and convert '\t' to ' ' */ for (i = j = 0; matchBuf[i]; i++, j++) if (matchBuf[i] == '\\') { collapse_pos(j, j + 1); int_buf[j] |= QUOT; i++; #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT if (matchBuf[i] == '\t') /* algorithm equivalent */ int_buf[j] = ' ' | QUOT; #endif } #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT else if (matchBuf[i] == '\t') int_buf[j] = ' '; #endif /* mask "symbols" or 'symbols' */ c2 = 0; for (i = 0; int_buf[i]; i++) { c = int_buf[i]; if (c == '\'' || c == '"') { if (c2 == 0) c2 = c; else { if (c == c2) c2 = 0; else int_buf[i] |= QUOT; } } else if (c2 != 0 && c != '$') int_buf[i] |= QUOT; } /* skip commands with arguments if line has commands delimiters */ /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */ for (i = 0; int_buf[i]; i++) { c = int_buf[i]; c2 = int_buf[i + 1]; j = i ? int_buf[i - 1] : -1; command_mode = 0; if (c == ';' || c == '&' || c == '|') { command_mode = 1 + (c == c2); if (c == '&') { if (j == '>' || j == '<') command_mode = 0; } else if (c == '|' && j == '>') command_mode = 0; } if (command_mode) { collapse_pos(0, i + command_mode); i = -1; /* hack incremet */ } } /* collapse `command...` */ for (i = 0; int_buf[i]; i++) if (int_buf[i] == '`') { for (j = i + 1; int_buf[j]; j++) if (int_buf[j] == '`') { collapse_pos(i, j + 1); j = 0; break; } if (j) { /* not found close ` - command mode, collapse all previous */ collapse_pos(0, i + 1); break; } else i--; /* hack incremet */ } /* collapse (command...(command...)...) or {command...{command...}...} */ c = 0; /* "recursive" level */ c2 = 0; for (i = 0; int_buf[i]; i++) if (int_buf[i] == '(' || int_buf[i] == '{') { if (int_buf[i] == '(') c++; else c2++; collapse_pos(0, i + 1); i = -1; /* hack incremet */ } for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) { if (int_buf[i] == ')') c--; else c2--; collapse_pos(0, i + 1); i = -1; /* hack incremet */ } /* skip first not quote space */ for (i = 0; int_buf[i]; i++) if (int_buf[i] != ' ') break; if (i) collapse_pos(0, i); /* set find mode for completion */ command_mode = FIND_EXE_ONLY; for (i = 0; int_buf[i]; i++) if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') { if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY && matchBuf[pos_buf[0]]=='c' && matchBuf[pos_buf[1]]=='d' ) { command_mode = FIND_DIR_ONLY; } else { command_mode = FIND_FILE_ONLY; break; } } for (i = 0; int_buf[i]; i++) /* "strlen" */; /* find last word */ for (--i; i >= 0; i--) { c = int_buf[i]; if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') { collapse_pos(0, i + 1); break; } } /* skip first not quoted '\'' or '"' */ for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++) /*skip*/; /* collapse quote or unquote // or /~ */ while ((int_buf[i] & ~QUOT) == '/' && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~') ) { i++; } /* set only match and destroy quotes */ j = 0; for (c = 0; pos_buf[i] >= 0; i++) { matchBuf[c++] = matchBuf[pos_buf[i]]; j = pos_buf[i] + 1; } matchBuf[c] = 0; /* old lenght matchBuf with quotes symbols */ *len_with_quotes = j ? j - pos_buf[0] : 0; return command_mode; } /* * display by column (original idea from ls applet, * very optimized by me :) */ static void showfiles(void) { int ncols, row; int column_width = 0; int nfiles = num_matches; int nrows = nfiles; int l; /* find the longest file name- use that as the column width */ for (row = 0; row < nrows; row++) { l = strlen(matches[row]); if (column_width < l) column_width = l; } column_width += 2; /* min space for columns */ ncols = cmdedit_termw / column_width; if (ncols > 1) { nrows /= ncols; if (nfiles % ncols) nrows++; /* round up fractionals */ } else { ncols = 1; } for (row = 0; row < nrows; row++) { int n = row; int nc; for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) { printf("%s%-*s", matches[n], (int)(column_width - strlen(matches[n])), ""); } printf("%s\n", matches[n]); } } static char *add_quote_for_spec_chars(char *found) { int l = 0; char *s = xmalloc((strlen(found) + 1) * 2); while (*found) { if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found)) s[l++] = '\\'; s[l++] = *found++; } s[l] = 0; return s; } static int match_compare(const void *a, const void *b) { return strcmp(*(char**)a, *(char**)b); } /* Do TAB completion */ static void input_tab(int *lastWasTab) { if (!(state->flags & TAB_COMPLETION)) return; if (!*lastWasTab) { char *tmp, *tmp1; int len_found; char matchBuf[MAX_LINELEN]; int find_type; int recalc_pos; *lastWasTab = TRUE; /* flop trigger */ /* Make a local copy of the string -- up * to the position of the cursor */ tmp = strncpy(matchBuf, command_ps, cursor); tmp[cursor] = '\0'; find_type = find_match(matchBuf, &recalc_pos); /* Free up any memory already allocated */ free_tab_completion_data(); #if ENABLE_FEATURE_USERNAME_COMPLETION /* If the word starts with `~' and there is no slash in the word, * then try completing this word as a username. */ if (state->flags & USERNAME_COMPLETION) if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0) username_tab_completion(matchBuf, NULL); #endif /* Try to match any executable in our path and everything * in the current working directory */ if (!matches) exe_n_cwd_tab_completion(matchBuf, find_type); /* Sort, then remove any duplicates found */ if (matches) { int i, n = 0; qsort(matches, num_matches, sizeof(char*), match_compare); for (i = 0; i < num_matches - 1; ++i) { if (matches[i] && matches[i+1]) { /* paranoia */ if (strcmp(matches[i], matches[i+1]) == 0) { free(matches[i]); matches[i] = NULL; /* paranoia */ } else { matches[n++] = matches[i]; } } } matches[n] = matches[i]; num_matches = n + 1; } /* Did we find exactly one match? */ if (!matches || num_matches > 1) { beep(); if (!matches) return; /* not found */ /* find minimal match */ // ash: yet another failure in trying to achieve "we don't die on OOM" tmp1 = xstrdup(matches[0]); for (tmp = tmp1; *tmp; tmp++) for (len_found = 1; len_found < num_matches; len_found++) if (matches[len_found][(tmp - tmp1)] != *tmp) { *tmp = '\0'; break; } if (*tmp1 == '\0') { /* have unique */ free(tmp1); return; } tmp = add_quote_for_spec_chars(tmp1); free(tmp1); } else { /* one match */ tmp = add_quote_for_spec_chars(matches[0]); /* for next completion current found */ *lastWasTab = FALSE; len_found = strlen(tmp); if (tmp[len_found-1] != '/') { tmp[len_found] = ' '; tmp[len_found+1] = '\0'; } } len_found = strlen(tmp); /* have space to placed match? */ if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) { /* before word for match */ command_ps[cursor - recalc_pos] = 0; /* save tail line */ strcpy(matchBuf, command_ps + cursor); /* add match */ strcat(command_ps, tmp); /* add tail */ strcat(command_ps, matchBuf); /* back to begin word for match */ input_backward(recalc_pos); /* new pos */ recalc_pos = cursor + len_found; /* new len */ command_len = strlen(command_ps); /* write out the matched command */ redraw(cmdedit_y, command_len - recalc_pos); } free(tmp); } else { /* Ok -- the last char was a TAB. Since they * just hit TAB again, print a list of all the * available choices... */ if (matches && num_matches > 0) { int sav_cursor = cursor; /* change goto_new_line() */ /* Go to the next line */ goto_new_line(); showfiles(); redraw(0, command_len - sav_cursor); } } } #else #define input_tab(a) ((void)0) #endif /* FEATURE_COMMAND_TAB_COMPLETION */ #if MAX_HISTORY > 0 /* state->flags is already checked to be nonzero */ static void get_previous_history(void) { if (command_ps[0] != '\0' || state->history[state->cur_history] == NULL) { free(state->history[state->cur_history]); state->history[state->cur_history] = xstrdup(command_ps); } state->cur_history--; } static int get_next_history(void) { if (state->flags & DO_HISTORY) { int ch = state->cur_history; if (ch < state->cnt_history) { get_previous_history(); /* save the current history line */ state->cur_history = ch + 1; return state->cur_history; } } beep(); return 0; } #if ENABLE_FEATURE_EDITING_SAVEHISTORY /* state->flags is already checked to be nonzero */ static void load_history(const char *fromfile) { FILE *fp; int hi; /* cleanup old */ for (hi = state->cnt_history; hi > 0;) { hi--; free(state->history[hi]); } fp = fopen(fromfile, "r"); if (fp) { for (hi = 0; hi < MAX_HISTORY;) { char *hl = xmalloc_getline(fp); int l; if (!hl) break; l = strlen(hl); if (l >= MAX_LINELEN) hl[MAX_LINELEN-1] = '\0'; if (l == 0 || hl[0] == ' ') { free(hl); continue; } state->history[hi++] = hl; } fclose(fp); } state->cur_history = state->cnt_history = hi; } /* state->flags is already checked to be nonzero */ static void save_history(const char *tofile) { FILE *fp; fp = fopen(tofile, "w"); if (fp) { int i; for (i = 0; i < state->cnt_history; i++) { fprintf(fp, "%s\n", state->history[i]); } fclose(fp); } } #else #define load_history(a) ((void)0) #define save_history(a) ((void)0) #endif /* FEATURE_COMMAND_SAVEHISTORY */ static void remember_in_history(const char *str) { int i; if (!(state->flags & DO_HISTORY)) return; i = state->cnt_history; free(state->history[MAX_HISTORY]); state->history[MAX_HISTORY] = NULL; /* After max history, remove the oldest command */ if (i >= MAX_HISTORY) { free(state->history[0]); for (i = 0; i < MAX_HISTORY-1; i++) state->history[i] = state->history[i+1]; } // Maybe "if (!i || strcmp(history[i-1], command) != 0) ..." // (i.e. do not save dups?) state->history[i++] = xstrdup(str); state->cur_history = i; state->cnt_history = i; #if ENABLE_FEATURE_EDITING_SAVEHISTORY if ((state->flags & SAVE_HISTORY) && state->hist_file) save_history(state->hist_file); #endif USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;) } #else /* MAX_HISTORY == 0 */ #define remember_in_history(a) ((void)0) #endif /* MAX_HISTORY */ /* * This function is used to grab a character buffer * from the input file descriptor and allows you to * a string with full command editing (sort of like * a mini readline). * * The following standard commands are not implemented: * ESC-b -- Move back one word * ESC-f -- Move forward one word * ESC-d -- Delete back one word * ESC-h -- Delete forward one word * CTL-t -- Transpose two characters * * Minimalist vi-style command line editing available if configured. * vi mode implemented 2005 by Paul Fox */ #if ENABLE_FEATURE_EDITING_VI static void vi_Word_motion(char *command, int eat) { while (cursor < command_len && !isspace(command[cursor])) input_forward(); if (eat) while (cursor < command_len && isspace(command[cursor])) input_forward(); } static void vi_word_motion(char *command, int eat) { if (isalnum(command[cursor]) || command[cursor] == '_') { while (cursor < command_len && (isalnum(command[cursor+1]) || command[cursor+1] == '_')) input_forward(); } else if (ispunct(command[cursor])) { while (cursor < command_len && ispunct(command[cursor+1])) input_forward(); } if (cursor < command_len) input_forward(); if (eat && cursor < command_len && isspace(command[cursor])) while (cursor < command_len && isspace(command[cursor])) input_forward(); } static void vi_End_motion(char *command) { input_forward(); while (cursor < command_len && isspace(command[cursor])) input_forward(); while (cursor < command_len-1 && !isspace(command[cursor+1])) input_forward(); } static void vi_end_motion(char *command) { if (cursor >= command_len-1) return; input_forward(); while (cursor < command_len-1 && isspace(command[cursor])) input_forward(); if (cursor >= command_len-1) return; if (isalnum(command[cursor]) || command[cursor] == '_') { while (cursor < command_len-1 && (isalnum(command[cursor+1]) || command[cursor+1] == '_') ) { input_forward(); } } else if (ispunct(command[cursor])) { while (cursor < command_len-1 && ispunct(command[cursor+1])) input_forward(); } } static void vi_Back_motion(char *command) { while (cursor > 0 && isspace(command[cursor-1])) input_backward(1); while (cursor > 0 && !isspace(command[cursor-1])) input_backward(1); } static void vi_back_motion(char *command) { if (cursor <= 0) return; input_backward(1); while (cursor > 0 && isspace(command[cursor])) input_backward(1); if (cursor <= 0) return; if (isalnum(command[cursor]) || command[cursor] == '_') { while (cursor > 0 && (isalnum(command[cursor-1]) || command[cursor-1] == '_') ) { input_backward(1); } } else if (ispunct(command[cursor])) { while (cursor > 0 && ispunct(command[cursor-1])) input_backward(1); } } #endif /* * read_line_input and its helpers */ #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT static void parse_prompt(const char *prmt_ptr) { cmdedit_prompt = prmt_ptr; cmdedit_prmt_len = strlen(prmt_ptr); put_prompt(); } #else static void parse_prompt(const char *prmt_ptr) { int prmt_len = 0; size_t cur_prmt_len = 0; char flg_not_length = '['; char *prmt_mem_ptr = xzalloc(1); char *pwd_buf = xrealloc_getcwd_or_warn(NULL); char buf2[PATH_MAX + 1]; char buf[2]; char c; char *pbuf; cmdedit_prmt_len = 0; if (!pwd_buf) { pwd_buf = (char *)bb_msg_unknown; } while (*prmt_ptr) { pbuf = buf; pbuf[1] = 0; c = *prmt_ptr++; if (c == '\\') { const char *cp = prmt_ptr; int l; c = bb_process_escape_sequence(&prmt_ptr); if (prmt_ptr == cp) { if (*cp == 0) break; c = *prmt_ptr++; switch (c) { #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR case 'u': pbuf = user_buf ? user_buf : (char*)""; break; #endif case 'h': pbuf = hostname_buf; if (!pbuf) { pbuf = xzalloc(256); if (gethostname(pbuf, 255) < 0) { strcpy(pbuf, "?"); } else { char *s = strchr(pbuf, '.'); if (s) *s = '\0'; } hostname_buf = pbuf; } break; case '$': c = (geteuid() == 0 ? '#' : '$'); break; #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR case 'w': pbuf = pwd_buf; l = strlen(home_pwd_buf); if (l != 0 && strncmp(home_pwd_buf, pbuf, l) == 0 && (pbuf[l]=='/' || pbuf[l]=='\0') && strlen(pwd_buf+l) UCHAR_MAX || (pbuf - buf2) < l) { l--; break; } prmt_ptr++; } buf2[l] = 0; c = (char)strtol(buf2, NULL, 16); if (c == 0) c = '?'; pbuf = buf; break; case '[': case ']': if (c == flg_not_length) { flg_not_length = flg_not_length == '[' ? ']' : '['; continue; } break; } } } if (pbuf == buf) *pbuf = c; cur_prmt_len = strlen(pbuf); prmt_len += cur_prmt_len; if (flg_not_length != ']') cmdedit_prmt_len += cur_prmt_len; prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf); } if (pwd_buf != (char *)bb_msg_unknown) free(pwd_buf); cmdedit_prompt = prmt_mem_ptr; put_prompt(); } #endif #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp) #define getTermSettings(fd, argp) tcgetattr(fd, argp); static sighandler_t previous_SIGWINCH_handler; static void cmdedit_setwidth(unsigned w, int redraw_flg) { cmdedit_termw = w; if (redraw_flg) { /* new y for current cursor */ int new_y = (cursor + cmdedit_prmt_len) / w; /* redraw */ redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor); fflush(stdout); } } static void win_changed(int nsig) { int width; get_terminal_width_height(0, &width, NULL); cmdedit_setwidth(width, nsig /* - just a yes/no flag */); if (nsig == SIGWINCH) signal(SIGWINCH, win_changed); /* rearm ourself */ } /* * The emacs and vi modes share much of the code in the big * command loop. Commands entered when in vi's command mode (aka * "escape mode") get an extra bit added to distinguish them -- * this keeps them from being self-inserted. This clutters the * big switch a bit, but keeps all the code in one place. */ #define vbit 0x100 /* leave out the "vi-mode"-only case labels if vi editing isn't * configured. */ #define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel) /* convert uppercase ascii to equivalent control char, for readability */ #undef CTRL #define CTRL(a) ((a) & ~0x40) /* Returns: * -1 on read errors or EOF, or on bare Ctrl-D. * 0 on ctrl-C, * >0 length of input string, including terminating '\n' */ int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *st) { int lastWasTab = FALSE; unsigned int ic; unsigned char c; smallint break_out = 0; #if ENABLE_FEATURE_EDITING_VI smallint vi_cmdmode = 0; smalluint prevc; #endif // FIXME: audit & improve this if (maxsize > MAX_LINELEN) maxsize = MAX_LINELEN; /* With null flags, no other fields are ever used */ state = st ? st : (line_input_t*) &const_int_0; #if ENABLE_FEATURE_EDITING_SAVEHISTORY if ((state->flags & SAVE_HISTORY) && state->hist_file) load_history(state->hist_file); #endif /* prepare before init handlers */ cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */ command_len = 0; command_ps = command; command[0] = '\0'; getTermSettings(0, (void *) &initial_settings); memcpy(&new_settings, &initial_settings, sizeof(new_settings)); new_settings.c_lflag &= ~ICANON; /* unbuffered input */ /* Turn off echoing and CTRL-C, so we can trap it */ new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG); /* Hmm, in linux c_cc[] is not parsed if ICANON is off */ new_settings.c_cc[VMIN] = 1; new_settings.c_cc[VTIME] = 0; /* Turn off CTRL-C, so we can trap it */ #ifndef _POSIX_VDISABLE #define _POSIX_VDISABLE '\0' #endif new_settings.c_cc[VINTR] = _POSIX_VDISABLE; setTermSettings(0, (void *) &new_settings); /* Now initialize things */ previous_SIGWINCH_handler = signal(SIGWINCH, win_changed); win_changed(0); /* do initial resizing */ #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR { struct passwd *entry; entry = getpwuid(geteuid()); if (entry) { /* If we enter read_line_input for the Nth time, * they may be already allocated! Need to free. */ free(user_buf); if (home_pwd_buf != null_str) free(home_pwd_buf); user_buf = xstrdup(entry->pw_name); home_pwd_buf = xstrdup(entry->pw_dir); /* They are not freed on exit (too small to bother) */ } } #endif /* Print out the command prompt */ parse_prompt(prompt); while (1) { fflush(stdout); if (safe_read(0, &c, 1) < 1) { /* if we can't read input then exit */ goto prepare_to_die; } ic = c; #if ENABLE_FEATURE_EDITING_VI newdelflag = 1; if (vi_cmdmode) ic |= vbit; #endif switch (ic) { case '\n': case '\r': vi_case('\n'|vbit:) vi_case('\r'|vbit:) /* Enter */ goto_new_line(); break_out = 1; break; #if ENABLE_FEATURE_EDITING_FANCY_KEYS case CTRL('A'): vi_case('0'|vbit:) /* Control-a -- Beginning of line */ input_backward(cursor); break; case CTRL('B'): vi_case('h'|vbit:) vi_case('\b'|vbit:) vi_case('\x7f'|vbit:) /* DEL */ /* Control-b -- Move back one character */ input_backward(1); break; #endif case CTRL('C'): vi_case(CTRL('C')|vbit:) /* Control-c -- stop gathering input */ goto_new_line(); command_len = 0; break_out = -1; /* "do not append '\n'" */ break; case CTRL('D'): /* Control-d -- Delete one character, or exit * if the len=0 and no chars to delete */ if (command_len == 0) { errno = 0; prepare_to_die: /* to control stopped jobs */ break_out = command_len = -1; break; } input_delete(0); break; #if ENABLE_FEATURE_EDITING_FANCY_KEYS case CTRL('E'): vi_case('$'|vbit:) /* Control-e -- End of line */ input_end(); break; case CTRL('F'): vi_case('l'|vbit:) vi_case(' '|vbit:) /* Control-f -- Move forward one character */ input_forward(); break; #endif case '\b': case '\x7f': /* DEL */ /* Control-h and DEL */ input_backspace(); break; case '\t': input_tab(&lastWasTab); break; #if ENABLE_FEATURE_EDITING_FANCY_KEYS case CTRL('K'): /* Control-k -- clear to end of line */ command[cursor] = 0; command_len = cursor; printf("\033[J"); break; case CTRL('L'): vi_case(CTRL('L')|vbit:) /* Control-l -- clear screen */ printf("\033[H"); redraw(0, command_len - cursor); break; #endif #if MAX_HISTORY > 0 case CTRL('N'): vi_case(CTRL('N')|vbit:) vi_case('j'|vbit:) /* Control-n -- Get next command in history */ if (get_next_history()) goto rewrite_line; break; case CTRL('P'): vi_case(CTRL('P')|vbit:) vi_case('k'|vbit:) /* Control-p -- Get previous command from history */ if ((state->flags & DO_HISTORY) && state->cur_history > 0) { get_previous_history(); goto rewrite_line; } beep(); break; #endif #if ENABLE_FEATURE_EDITING_FANCY_KEYS case CTRL('U'): vi_case(CTRL('U')|vbit:) /* Control-U -- Clear line before cursor */ if (cursor) { strcpy(command, command + cursor); command_len -= cursor; redraw(cmdedit_y, command_len); } break; #endif case CTRL('W'): vi_case(CTRL('W')|vbit:) /* Control-W -- Remove the last word */ while (cursor > 0 && isspace(command[cursor-1])) input_backspace(); while (cursor > 0 && !isspace(command[cursor-1])) input_backspace(); break; #if ENABLE_FEATURE_EDITING_VI case 'i'|vbit: vi_cmdmode = 0; break; case 'I'|vbit: input_backward(cursor); vi_cmdmode = 0; break; case 'a'|vbit: input_forward(); vi_cmdmode = 0; break; case 'A'|vbit: input_end(); vi_cmdmode = 0; break; case 'x'|vbit: input_delete(1); break; case 'X'|vbit: if (cursor > 0) { input_backward(1); input_delete(1); } break; case 'W'|vbit: vi_Word_motion(command, 1); break; case 'w'|vbit: vi_word_motion(command, 1); break; case 'E'|vbit: vi_End_motion(command); break; case 'e'|vbit: vi_end_motion(command); break; case 'B'|vbit: vi_Back_motion(command); break; case 'b'|vbit: vi_back_motion(command); break; case 'C'|vbit: vi_cmdmode = 0; /* fall through */ case 'D'|vbit: goto clear_to_eol; case 'c'|vbit: vi_cmdmode = 0; /* fall through */ case 'd'|vbit: { int nc, sc; sc = cursor; prevc = ic; if (safe_read(0, &c, 1) < 1) goto prepare_to_die; if (c == (prevc & 0xff)) { /* "cc", "dd" */ input_backward(cursor); goto clear_to_eol; break; } switch (c) { case 'w': case 'W': case 'e': case 'E': switch (c) { case 'w': /* "dw", "cw" */ vi_word_motion(command, vi_cmdmode); break; case 'W': /* 'dW', 'cW' */ vi_Word_motion(command, vi_cmdmode); break; case 'e': /* 'de', 'ce' */ vi_end_motion(command); input_forward(); break; case 'E': /* 'dE', 'cE' */ vi_End_motion(command); input_forward(); break; } nc = cursor; input_backward(cursor - sc); while (nc-- > cursor) input_delete(1); break; case 'b': /* "db", "cb" */ case 'B': /* implemented as B */ if (c == 'b') vi_back_motion(command); else vi_Back_motion(command); while (sc-- > cursor) input_delete(1); break; case ' ': /* "d ", "c " */ input_delete(1); break; case '$': /* "d$", "c$" */ clear_to_eol: while (cursor < command_len) input_delete(1); break; } break; } case 'p'|vbit: input_forward(); /* fallthrough */ case 'P'|vbit: put(); break; case 'r'|vbit: if (safe_read(0, &c, 1) < 1) goto prepare_to_die; if (c == 0) beep(); else { *(command + cursor) = c; putchar(c); putchar('\b'); } break; #endif /* FEATURE_COMMAND_EDITING_VI */ case '\x1b': /* ESC */ #if ENABLE_FEATURE_EDITING_VI if (state->flags & VI_MODE) { /* ESC: insert mode --> command mode */ vi_cmdmode = 1; input_backward(1); break; } #endif /* escape sequence follows */ if (safe_read(0, &c, 1) < 1) goto prepare_to_die; /* different vt100 emulations */ if (c == '[' || c == 'O') { vi_case('['|vbit:) vi_case('O'|vbit:) if (safe_read(0, &c, 1) < 1) goto prepare_to_die; } if (c >= '1' && c <= '9') { unsigned char dummy; if (safe_read(0, &dummy, 1) < 1) goto prepare_to_die; if (dummy != '~') c = '\0'; } switch (c) { #if ENABLE_FEATURE_TAB_COMPLETION case '\t': /* Alt-Tab */ input_tab(&lastWasTab); break; #endif #if MAX_HISTORY > 0 case 'A': /* Up Arrow -- Get previous command from history */ if ((state->flags & DO_HISTORY) && state->cur_history > 0) { get_previous_history(); goto rewrite_line; } beep(); break; case 'B': /* Down Arrow -- Get next command in history */ if (!get_next_history()) break; rewrite_line: /* Rewrite the line with the selected history item */ /* change command */ command_len = strlen(strcpy(command, state->history[state->cur_history])); /* redraw and go to eol (bol, in vi */ redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0); break; #endif case 'C': /* Right Arrow -- Move forward one character */ input_forward(); break; case 'D': /* Left Arrow -- Move back one character */ input_backward(1); break; case '3': /* Delete */ input_delete(0); break; case '1': // vt100? linux vt? or what? case '7': // vt100? linux vt? or what? case 'H': /* xterm's */ input_backward(cursor); break; case '4': // vt100? linux vt? or what? case '8': // vt100? linux vt? or what? case 'F': /* xterm's */ input_end(); break; default: c = '\0'; beep(); } break; default: /* If it's regular input, do the normal thing */ #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT /* Control-V -- Add non-printable symbol */ if (c == CTRL('V')) { if (safe_read(0, &c, 1) < 1) goto prepare_to_die; if (c == 0) { beep(); break; } } else #endif #if ENABLE_FEATURE_EDITING_VI if (vi_cmdmode) /* Don't self-insert */ break; #endif if (!Isprint(c)) /* Skip non-printable characters */ break; if (command_len >= (maxsize - 2)) /* Need to leave space for enter */ break; command_len++; if (cursor == (command_len - 1)) { /* Append if at the end of the line */ command[cursor] = c; command[cursor+1] = '\0'; cmdedit_set_out_char(' '); } else { /* Insert otherwise */ int sc = cursor; memmove(command + sc + 1, command + sc, command_len - sc); command[sc] = c; sc++; /* rewrite from cursor */ input_end(); /* to prev x pos + 1 */ input_backward(cursor - sc); } break; } if (break_out) /* Enter is the command terminator, no more input. */ break; if (c != '\t') lastWasTab = FALSE; } if (command_len > 0) remember_in_history(command); if (break_out > 0) { command[command_len++] = '\n'; command[command_len] = '\0'; } #if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_TAB_COMPLETION free_tab_completion_data(); #endif #if ENABLE_FEATURE_EDITING_FANCY_PROMPT free((char*)cmdedit_prompt); #endif /* restore initial_settings */ setTermSettings(STDIN_FILENO, (void *) &initial_settings); /* restore SIGWINCH handler */ signal(SIGWINCH, previous_SIGWINCH_handler); fflush(stdout); return command_len; } line_input_t *new_line_input_t(int flags) { line_input_t *n = xzalloc(sizeof(*n)); n->flags = flags; return n; } #else #undef read_line_input int read_line_input(const char* prompt, char* command, int maxsize) { fputs(prompt, stdout); fflush(stdout); fgets(command, maxsize, stdin); return strlen(command); } #endif /* FEATURE_COMMAND_EDITING */ /* * Testing */ #ifdef TEST #include 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 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT setlocale(LC_ALL, ""); #endif while (1) { int l; l = read_line_input(prompt, buff); if (l <= 0 || buff[l-1] != '\n') break; buff[l-1] = 0; printf("*** read_line_input() returned line =%s=\n", buff); } printf("*** read_line_input() detect ^D\n"); return 0; } #endif /* TEST */