diff options
Diffstat (limited to 'editors')
| -rw-r--r-- | editors/vi.c | 227 |
1 files changed, 120 insertions, 107 deletions
diff --git a/editors/vi.c b/editors/vi.c index 9426ab8..e58d6b3 100644 --- a/editors/vi.c +++ b/editors/vi.c @@ -35,6 +35,7 @@ enum { MAX_LINELEN = CONFIG_FEATURE_VI_MAX_LEN, MAX_SCR_COLS = CONFIG_FEATURE_VI_MAX_LEN, + MAX_TABSTOP = 32, // sanity limit }; // Misc. non-Ascii keys that report an escape sequence @@ -116,7 +117,8 @@ static int fn_start; // index of first cmd line file name static int save_argc; // how many file names on cmd line static int cmdcnt; // repetition count static int rows, columns; // the terminal screen is this size -static int crow, ccol, offset; // cursor is on Crow x Ccol with Horz Ofset +static int crow, ccol; // cursor is on Crow x Ccol +static int offset; // chars scrolled off the screen to the left static char *status_buffer; // mesages to the user #define STATUS_BUFFER_LEN 200 static int have_status_msg; // is default edit status needed? @@ -253,6 +255,9 @@ static int file_insert(const char *, char *, int); static int file_insert(const char *, char *); #endif static int file_write(char *, char *, char *); +#if !ENABLE_FEATURE_VI_OPTIMIZE_CURSOR +#define place_cursor(a, b, optimize) place_cursor(a, b) +#endif static void place_cursor(int, int, int); static void screen_erase(void); static void clear_to_eol(void); @@ -266,7 +271,7 @@ static void psbs(const char *, ...); // Print Status Buf in standout mode static void ni(const char *); // display messages static int format_edit_status(void); // format file status on status line static void redraw(int); // force a full screen refresh -static void format_line(char*, char*, int); +static int format_line(char*, char*, int); static void refresh(int); // update the terminal from screen[] static void Indicate_Error(void); // use flash or beep to indicate error @@ -992,7 +997,7 @@ static void colon(char * buf) /* tabstopXXXX */ if (strncasecmp(argp + i, "tabstop=%d ", 7) == 0) { sscanf(strchr(argp + i, '='), "tabstop=%d" + 7, &ch); - if (ch > 0 && ch < columns - 1) + if (ch > 0 && ch <= MAX_TABSTOP) tabstop = ch; } while (*argp && *argp != ' ') @@ -1252,7 +1257,7 @@ static char *end_line(char * p) // return pointer to NL of cur line line return p; } -static inline char *dollar_line(char * p) // return pointer to just before NL line +static char *dollar_line(char * p) // return pointer to just before NL line { while (p < end - 1 && *p != '\n') p++; // go to cur line E-o-l @@ -1923,7 +1928,7 @@ static void show_help(void) ); } -static inline void print_literal(char * buf, const char * s) // copy s to buf, convert unprintable +static void print_literal(char * buf, const char * s) // copy s to buf, convert unprintable { unsigned char c; char b[2]; @@ -2055,7 +2060,7 @@ static void check_context(char cmd) } } -static inline char *swap_context(char * p) // goto new context for '' command make this the current context +static char *swap_context(char * p) // goto new context for '' command make this the current context { char *tmp; @@ -2147,7 +2152,7 @@ static int mysleep(int hund) // sleep for 'h' 1/100 seconds return safe_poll(pfd, 1, hund*10) > 0; } -static int readed_for_parse; +static int chars_to_parse; //----- IO Routines -------------------------------------------- static char readit(void) // read (maybe cursor) key from stdin @@ -2199,7 +2204,7 @@ static char readit(void) // read (maybe cursor) key from stdin alarm(0); // turn alarm OFF while we wait for input fflush(stdout); - n = readed_for_parse; + n = chars_to_parse; // get input from User- are there already input chars in Q? if (n <= 0) { // the Q is empty, wait for a typed char @@ -2228,7 +2233,7 @@ static char readit(void) // read (maybe cursor) key from stdin n += r; } } - readed_for_parse = n; + chars_to_parse = n; } c = readbuffer[0]; if (c == 27 && n > 1) { @@ -2256,7 +2261,7 @@ static char readit(void) // read (maybe cursor) key from stdin n = 1; } // remove key sequence from Q - readed_for_parse -= n; + chars_to_parse -= n; memmove(readbuffer, readbuffer + n, MAX_LINELEN - n); alarm(3); // we are done waiting for input, turn alarm ON return c; @@ -2265,7 +2270,7 @@ static char readit(void) // read (maybe cursor) key from stdin //----- IO Routines -------------------------------------------- static char get_one_char(void) { - static char c; + char c; #if ENABLE_FEATURE_VI_DOT_CMD // ! adding2q && ioq == 0 read() @@ -2290,7 +2295,7 @@ static char get_one_char(void) } else { // adding STDIN chars to q c = readit(); // get the users input - if (last_modifying_cmd != 0) { + if (last_modifying_cmd != NULL) { int len = strlen(last_modifying_cmd); if (len >= MAX_LINELEN - 1) { psbs("last_modifying_cmd overrun"); @@ -2303,17 +2308,18 @@ static char get_one_char(void) #else c = readit(); // get the users input #endif /* FEATURE_VI_DOT_CMD */ - return c; // return the char, where ever it came from + return c; } static char *get_input_line(const char * prompt) // get input line- use "status line" { - static char *obufp; + static char *buf; // [MAX_LINELEN] - char buf[MAX_LINELEN]; char c; int i; + if (!buf) buf = xmalloc(MAX_LINELEN); + strcpy(buf, prompt); last_status_cksum = 0; // force status update place_cursor(rows - 1, 0, FALSE); // go to Status line, bottom of screen @@ -2329,7 +2335,7 @@ static char *get_input_line(const char * prompt) // get input line- use "status // user wants to erase prev char i--; // backup to prev char buf[i] = '\0'; // erase the char - buf[i + 1] = '\0'; // null terminate buffer + //buf[i + 1] = '\0'; // null terminate buffer write1("\b \b"); // erase char on screen if (i <= 0) { // user backs up before b-o-l, exit break; @@ -2342,9 +2348,7 @@ static char *get_input_line(const char * prompt) // get input line- use "status } } refresh(FALSE); - free(obufp); - obufp = xstrdup(buf); - return obufp; + return buf; } static int file_size(const char *fn) // what is the byte size of "fn" @@ -2434,12 +2438,11 @@ static int file_write(char * fn, char * first, char * last) return -2; } charcnt = 0; - // FIXIT- use the correct umask() - fd = open(fn, (O_WRONLY | O_CREAT | O_TRUNC), 0664); + fd = open(fn, (O_WRONLY | O_CREAT | O_TRUNC), 0666); if (fd < 0) return -1; cnt = last - first + 1; - charcnt = write(fd, first, cnt); + charcnt = full_write(fd, first, cnt); if (charcnt == cnt) { // good write //file_modified = FALSE; // the file has not been modified @@ -2459,22 +2462,13 @@ static int file_write(char * fn, char * first, char * last) // . ... . // . ... . // 22,0 ... 22,79 -// 23,0 ... 23,79 status line -// +// 23,0 ... 23,79 <- status line //----- Move the cursor to row x col (count from 0, not 1) ------- -static void place_cursor(int row, int col, int opti) +static void place_cursor(int row, int col, int optimize) { - char cm1[MAX_LINELEN]; + char cm1[32]; char *cm; -#if ENABLE_FEATURE_VI_OPTIMIZE_CURSOR - char cm2[MAX_LINELEN]; - char *screenp; - // char cm3[MAX_LINELEN]; - int Rrow = last_row; -#endif - - memset(cm1, '\0', MAX_LINELEN); // clear the buffer if (row < 0) row = 0; if (row >= rows) row = rows - 1; @@ -2484,45 +2478,42 @@ static void place_cursor(int row, int col, int opti) //----- 1. Try the standard terminal ESC sequence sprintf(cm1, CMrc, row + 1, col + 1); cm = cm1; - if (!opti) - goto pc0; #if ENABLE_FEATURE_VI_OPTIMIZE_CURSOR - //----- find the minimum # of chars to move cursor ------------- - //----- 2. Try moving with discreet chars (Newline, [back]space, ...) - memset(cm2, '\0', MAX_LINELEN); // clear the buffer + if (optimize && col < 16) { + char cm2[MAX_LINELEN]; // better size estimate? + char *screenp; + int Rrow = last_row; - // move to the correct row - while (row < Rrow) { - // the cursor has to move up - strcat(cm2, CMup); - Rrow--; - } - while (row > Rrow) { - // the cursor has to move down - strcat(cm2, CMdown); - Rrow++; - } + //----- find the minimum # of chars to move cursor ------------- + //----- 2. Try moving with discreet chars (Newline, [back]space, ...) + cm2[0] = '\0'; - // now move to the correct column - strcat(cm2, "\r"); // start at col 0 - // just send out orignal source char to get to correct place - screenp = &screen[row * columns]; // start of screen line - strncat(cm2, screenp, col); + // move to the correct row + while (row < Rrow) { + // the cursor has to move up + strcat(cm2, CMup); + Rrow--; + } + while (row > Rrow) { + // the cursor has to move down + strcat(cm2, CMdown); + Rrow++; + } - //----- 3. Try some other way of moving cursor - //--------------------------------------------- + // now move to the correct column + strcat(cm2, "\r"); // start at col 0 + // just send out orignal source char to get to correct place + screenp = &screen[row * columns]; // start of screen line + strncat(cm2, screenp, col); - // pick the shortest cursor motion to send out - cm = cm1; - if (strlen(cm2) < strlen(cm)) { - cm = cm2; - } /* else if (strlen(cm3) < strlen(cm)) { - cm= cm3; - } */ + // pick the shortest cursor motion to send out + if (strlen(cm2) < strlen(cm)) { + cm = cm2; + } + } #endif /* FEATURE_VI_OPTIMIZE_CURSOR */ - pc0: - write1(cm); // move the cursor + write1(cm); } //----- Erase from cursor to end of line ----------------------- @@ -2721,11 +2712,15 @@ static void redraw(int full_screen) } //----- Format a text[] line into a buffer --------------------- -static void format_line(char *dest, char *src, int li) +// Returns number of leading chars which should be ignored +// (return value is always <= offset) +static int format_line(char *dest, char *src, int li) { - int co; char c; + int co; + int ofs = offset; + memset(dest, ' ', MAX_SCR_COLS); for (co = 0; co < MAX_SCR_COLS; co++) { c = ' '; // assume blank if (li > 0 && co == 0) { @@ -2734,33 +2729,52 @@ static void format_line(char *dest, char *src, int li) // are there chars in text[] and have we gone past the end if (text < end && src < end) { c = *src++; - } - if (c == '\n') - break; - if ((c & 0x80) && !Isprint(c)) { - c = '.'; - } - if ((unsigned char)(c) < ' ' || c == 0x7f) { - if (c == '\t') { - c = ' '; - // co % 8 != 7 - for (; (co % tabstop) != (tabstop - 1); co++) { - dest[co] = c; + + if (c == '\n') + break; + if ((c & 0x80) && !Isprint(c)) { + c = '.'; + } + if ((unsigned char)(c) < ' ' || c == 0x7f) { + if (c == '\t') { + c = ' '; + // co % 8 != 7 + while ((co % tabstop) != (tabstop - 1)) { + dest[co++] = c; + if (co >= MAX_SCR_COLS) + goto ret; + } + } else { + dest[co++] = '^'; + if (co >= MAX_SCR_COLS) + goto ret; + if (c == 0x7f) + c = '?'; + else + c += '@'; // make it visible } - } else { - dest[co++] = '^'; - if (c == 0x7f) - c = '?'; - else - c += '@'; // make it visible } } // the co++ is done here so that the column will // not be overwritten when we blank-out the rest of line dest[co] = c; + // discard scrolled-off portion, in tabstop-sized pieces + if (ofs >= tabstop && co >= tabstop) { + co -= tabstop; + ofs -= tabstop; + memset(&dest[co + 1], ' ', tabstop); + } if (src >= end) break; } + ret: + if (co < ofs) { + // entire line has scrolled off, make it entirely blank + memset(dest, ' ', MAX_SCR_COLS); + ofs = 0; + } + dest[MAX_SCR_COLS-1] = '\0'; + return ofs; } //----- Refresh the changed screen lines ----------------------- @@ -2786,19 +2800,19 @@ static void refresh(int full_screen) // compare text[] to screen[] and mark screen[] lines that need updating for (li = 0; li < rows - 1; li++) { + int ofs; int cs, ce; // column start & end - memset(buf, ' ', MAX_SCR_COLS); // blank-out the buffer - buf[MAX_SCR_COLS-1] = 0; // NULL terminate the buffer // format current text line into buf - format_line(buf, tp, li); + ofs = format_line(buf, tp, li); // skip to the end of the current text[] line - while (tp < end && *tp++ != '\n') /*no-op*/; + while (tp < end && *tp++ != '\n') + continue; // see if there are any changes between vitual screen and buf changed = FALSE; // assume no change - cs= 0; - ce= columns-1; + cs = 0; + ce = columns - 1; sp = &screen[li * columns]; // start of screen line if (full_screen) { // force re-draw of every single column from 0 - columns-1 @@ -2807,15 +2821,15 @@ static void refresh(int full_screen) // compare newly formatted buffer with virtual screen // look forward for first difference between buf and screen for (; cs <= ce; cs++) { - if (buf[cs + offset] != sp[cs]) { + if (buf[cs + ofs] != sp[cs]) { changed = TRUE; // mark for redraw break; } } // look backward for last difference between buf and screen - for ( ; ce >= cs; ce--) { - if (buf[ce + offset] != sp[ce]) { + for (; ce >= cs; ce--) { + if (buf[ce + ofs] != sp[ce]) { changed = TRUE; // mark for redraw break; } @@ -2829,13 +2843,13 @@ static void refresh(int full_screen) } // make a sanity check of columns indexes - if (cs < 0) cs= 0; - if (ce > columns-1) ce= columns-1; - if (cs > ce) { cs= 0; ce= columns-1; } + if (cs < 0) cs = 0; + if (ce > columns - 1) ce = columns - 1; + if (cs > ce) { cs = 0; ce = columns - 1; } // is there a change between vitual screen and buf if (changed) { - // copy changed part of buffer to virtual screen - memmove(sp+cs, buf+(cs+offset), ce-cs+1); + // copy changed part of buffer to virtual screen + memmove(sp+cs, buf+(cs+ofs), ce-cs+1); // move cursor to column of first change if (offset != old_offset) { @@ -2848,7 +2862,7 @@ static void refresh(int full_screen) // try to optimize cursor movement // otherwise, use standard ESC sequence place_cursor(li, cs, li == (last_li+1) ? TRUE : FALSE); - last_li= li; + last_li = li; #else place_cursor(li, cs, FALSE); // use standard ESC sequence #endif /* FEATURE_VI_OPTIMIZE_CURSOR */ @@ -2859,7 +2873,7 @@ static void refresh(int full_screen) int nic = ce - cs + 1; char *out = sp + cs; - while (nic-- > 0) { + while (--nic >= 0) { bb_putchar(*out); out++; } @@ -2877,8 +2891,7 @@ static void refresh(int full_screen) place_cursor(crow, ccol, FALSE); #endif - if (offset != old_offset) - old_offset = offset; + old_offset = offset; } //--------------------------------------------------------------------- @@ -3230,7 +3243,7 @@ static void do_cmd(char c) case '.': // .- repeat the last modifying command // Stuff the last_modifying_cmd back into stdin // and let it be re-executed. - if (last_modifying_cmd != 0) { + if (last_modifying_cmd != NULL) { ioq = ioq_start = xstrdup(last_modifying_cmd); } break; @@ -3844,7 +3857,7 @@ static void crash_dummy() cmd1 = " \n\r\002\004\005\006\025\0310^$-+wWeEbBhjklHL"; // is there already a command running? - if (readed_for_parse > 0) + if (chars_to_parse > 0) goto cd1; cd0: startrbi = rbi = 0; @@ -3921,7 +3934,7 @@ static void crash_dummy() } strcat(readbuffer, "\033"); } - readed_for_parse = strlen(readbuffer); + chars_to_parse = strlen(readbuffer); cd1: totalcmds++; if (sleeptime > 0) |