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/* vi: set sw=4 ts=4: */
/*
* tiny vi.c: A small 'vi' clone
* Copyright (C) 2000, 2001 Sterling Huxley <sterling@europa.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//
//Things To Do:
// EXINIT
// $HOME/.exrc and ./.exrc
// add magic to search /foo.*bar
// add :help command
// :map macros
// if mark[] values were line numbers rather than pointers
// it would be easier to change the mark when add/delete lines
// More intelligence in refresh()
// ":r !cmd" and "!cmd" to filter text through an external command
// An "ex" line oriented mode- maybe using "cmdedit"
//config:config VI
//config: bool "vi (23 kb)"
//config: default y
//config: help
//config: 'vi' is a text editor. More specifically, it is the One True
//config: text editor <grin>. It does, however, have a rather steep
//config: learning curve. If you are not already comfortable with 'vi'
//config: you may wish to use something else.
//config:
//config:config FEATURE_VI_MAX_LEN
//config: int "Maximum screen width"
//config: range 256 16384
//config: default 4096
//config: depends on VI
//config: help
//config: Contrary to what you may think, this is not eating much.
//config: Make it smaller than 4k only if you are very limited on memory.
//config:
//config:config FEATURE_VI_8BIT
//config: bool "Allow to display 8-bit chars (otherwise shows dots)"
//config: default n
//config: depends on VI
//config: help
//config: If your terminal can display characters with high bit set,
//config: you may want to enable this. Note: vi is not Unicode-capable.
//config: If your terminal combines several 8-bit bytes into one character
//config: (as in Unicode mode), this will not work properly.
//config:
//config:config FEATURE_VI_COLON
//config: bool "Enable \":\" colon commands (no \"ex\" mode)"
//config: default y
//config: depends on VI
//config: help
//config: Enable a limited set of colon commands. This does not
//config: provide an "ex" mode.
//config:
//config:config FEATURE_VI_YANKMARK
//config: bool "Enable yank/put commands and mark cmds"
//config: default y
//config: depends on VI
//config: help
//config: This enables you to use yank and put, as well as mark.
//config:
//config:config FEATURE_VI_SEARCH
//config: bool "Enable search and replace cmds"
//config: default y
//config: depends on VI
//config: help
//config: Select this if you wish to be able to do search and replace.
//config:
//config:config FEATURE_VI_REGEX_SEARCH
//config: bool "Enable regex in search and replace"
//config: default n # Uses GNU regex, which may be unavailable. FIXME
//config: depends on FEATURE_VI_SEARCH
//config: help
//config: Use extended regex search.
//config:
//config:config FEATURE_VI_USE_SIGNALS
//config: bool "Catch signals"
//config: default y
//config: depends on VI
//config: help
//config: Selecting this option will make vi signal aware. This will support
//config: SIGWINCH to deal with Window Changes, catch ^Z and ^C and alarms.
//config:
//config:config FEATURE_VI_DOT_CMD
//config: bool "Remember previous cmd and \".\" cmd"
//config: default y
//config: depends on VI
//config: help
//config: Make vi remember the last command and be able to repeat it.
//config:
//config:config FEATURE_VI_READONLY
//config: bool "Enable -R option and \"view\" mode"
//config: default y
//config: depends on VI
//config: help
//config: Enable the read-only command line option, which allows the user to
//config: open a file in read-only mode.
//config:
//config:config FEATURE_VI_SETOPTS
//config: bool "Enable settable options, ai ic showmatch"
//config: default y
//config: depends on VI
//config: help
//config: Enable the editor to set some (ai, ic, showmatch) options.
//config:
//config:config FEATURE_VI_SET
//config: bool "Support :set"
//config: default y
//config: depends on VI
//config:
//config:config FEATURE_VI_WIN_RESIZE
//config: bool "Handle window resize"
//config: default y
//config: depends on VI
//config: help
//config: Behave nicely with terminals that get resized.
//config:
//config:config FEATURE_VI_ASK_TERMINAL
//config: bool "Use 'tell me cursor position' ESC sequence to measure window"
//config: default y
//config: depends on VI
//config: help
//config: If terminal size can't be retrieved and $LINES/$COLUMNS are not set,
//config: this option makes vi perform a last-ditch effort to find it:
//config: position cursor to 999,999 and ask terminal to report real
//config: cursor position using "ESC [ 6 n" escape sequence, then read stdin.
//config: This is not clean but helps a lot on serial lines and such.
//config:
//config:config FEATURE_VI_UNDO
//config: bool "Support undo command \"u\""
//config: default y
//config: depends on VI
//config: help
//config: Support the 'u' command to undo insertion, deletion, and replacement
//config: of text.
//config:
//config:config FEATURE_VI_UNDO_QUEUE
//config: bool "Enable undo operation queuing"
//config: default y
//config: depends on FEATURE_VI_UNDO
//config: help
//config: The vi undo functions can use an intermediate queue to greatly lower
//config: malloc() calls and overhead. When the maximum size of this queue is
//config: reached, the contents of the queue are committed to the undo stack.
//config: This increases the size of the undo code and allows some undo
//config: operations (especially un-typing/backspacing) to be far more useful.
//config:
//config:config FEATURE_VI_UNDO_QUEUE_MAX
//config: int "Maximum undo character queue size"
//config: default 256
//config: range 32 65536
//config: depends on FEATURE_VI_UNDO_QUEUE
//config: help
//config: This option sets the number of bytes used at runtime for the queue.
//config: Smaller values will create more undo objects and reduce the amount
//config: of typed or backspaced characters that are grouped into one undo
//config: operation; larger values increase the potential size of each undo
//config: and will generally malloc() larger objects and less frequently.
//config: Unless you want more (or less) frequent "undo points" while typing,
//config: you should probably leave this unchanged.
//applet:IF_VI(APPLET(vi, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_VI) += vi.o
//usage:#define vi_trivial_usage
//usage: "[OPTIONS] [FILE]..."
//usage:#define vi_full_usage "\n\n"
//usage: "Edit FILE\n"
//usage: IF_FEATURE_VI_COLON(
//usage: "\n -c CMD Initial command to run ($EXINIT also available)"
//usage: )
//usage: IF_FEATURE_VI_READONLY(
//usage: "\n -R Read-only"
//usage: )
//usage: "\n -H List available features"
#include "libbb.h"
// Should be after libbb.h: on some systems regex.h needs sys/types.h:
#if ENABLE_FEATURE_VI_REGEX_SEARCH
# include <regex.h>
#endif
// the CRASHME code is unmaintained, and doesn't currently build
#define ENABLE_FEATURE_VI_CRASHME 0
#if ENABLE_LOCALE_SUPPORT
#if ENABLE_FEATURE_VI_8BIT
//FIXME: this does not work properly for Unicode anyway
# define Isprint(c) (isprint)(c)
#else
# define Isprint(c) isprint_asciionly(c)
#endif
#else
// 0x9b is Meta-ESC
#if ENABLE_FEATURE_VI_8BIT
# define Isprint(c) ((unsigned char)(c) >= ' ' && (c) != 0x7f && (unsigned char)(c) != 0x9b)
#else
# define Isprint(c) ((unsigned char)(c) >= ' ' && (unsigned char)(c) < 0x7f)
#endif
#endif
enum {
MAX_TABSTOP = 32, // sanity limit
// User input len. Need not be extra big.
// Lines in file being edited *can* be bigger than this.
MAX_INPUT_LEN = 128,
// Sanity limits. We have only one buffer of this size.
MAX_SCR_COLS = CONFIG_FEATURE_VI_MAX_LEN,
MAX_SCR_ROWS = CONFIG_FEATURE_VI_MAX_LEN,
};
// VT102 ESC sequences.
// See "Xterm Control Sequences"
// http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
#define ESC "\033"
// Inverse/Normal text
#define ESC_BOLD_TEXT ESC"[7m"
#define ESC_NORM_TEXT ESC"[m"
// Bell
#define ESC_BELL "\007"
// Clear-to-end-of-line
#define ESC_CLEAR2EOL ESC"[K"
// Clear-to-end-of-screen.
// (We use default param here.
// Full sequence is "ESC [ <num> J",
// <num> is 0/1/2 = "erase below/above/all".)
#define ESC_CLEAR2EOS ESC"[J"
// Cursor to given coordinate (1,1: top left)
#define ESC_SET_CURSOR_POS ESC"[%u;%uH"
#define ESC_SET_CURSOR_TOPLEFT ESC"[H"
//UNUSED
//// Cursor up and down
//#define ESC_CURSOR_UP ESC"[A"
//#define ESC_CURSOR_DOWN "\n"
#if ENABLE_FEATURE_VI_DOT_CMD || ENABLE_FEATURE_VI_YANKMARK
// cmds modifying text[]
static const char modifying_cmds[] ALIGN1 = "aAcCdDiIJoOpPrRs""xX<>~";
#endif
enum {
YANKONLY = FALSE,
YANKDEL = TRUE,
FORWARD = 1, // code depends on "1" for array index
BACK = -1, // code depends on "-1" for array index
LIMITED = 0, // char_search() only current line
FULL = 1, // char_search() to the end/beginning of entire text
S_BEFORE_WS = 1, // used in skip_thing() for moving "dot"
S_TO_WS = 2, // used in skip_thing() for moving "dot"
S_OVER_WS = 3, // used in skip_thing() for moving "dot"
S_END_PUNCT = 4, // used in skip_thing() for moving "dot"
S_END_ALNUM = 5, // used in skip_thing() for moving "dot"
};
// vi.c expects chars to be unsigned.
// busybox build system provides that, but it's better
// to audit and fix the source
struct globals {
// many references - keep near the top of globals
char *text, *end; // pointers to the user data in memory
char *dot; // where all the action takes place
int text_size; // size of the allocated buffer
// the rest
smallint vi_setops;
#define VI_AUTOINDENT 1
#define VI_SHOWMATCH 2
#define VI_IGNORECASE 4
#define VI_ERR_METHOD 8
#define autoindent (vi_setops & VI_AUTOINDENT)
#define showmatch (vi_setops & VI_SHOWMATCH )
#define ignorecase (vi_setops & VI_IGNORECASE)
// indicate error with beep or flash
#define err_method (vi_setops & VI_ERR_METHOD)
#if ENABLE_FEATURE_VI_READONLY
smallint readonly_mode;
#define SET_READONLY_FILE(flags) ((flags) |= 0x01)
#define SET_READONLY_MODE(flags) ((flags) |= 0x02)
#define UNSET_READONLY_FILE(flags) ((flags) &= 0xfe)
#else
#define SET_READONLY_FILE(flags) ((void)0)
#define SET_READONLY_MODE(flags) ((void)0)
#define UNSET_READONLY_FILE(flags) ((void)0)
#endif
smallint editing; // >0 while we are editing a file
// [code audit says "can be 0, 1 or 2 only"]
smallint cmd_mode; // 0=command 1=insert 2=replace
int modified_count; // buffer contents changed if !0
int last_modified_count; // = -1;
int cmdline_filecnt; // how many file names on cmd line
int cmdcnt; // repetition count
unsigned rows, columns; // the terminal screen is this size
#if ENABLE_FEATURE_VI_ASK_TERMINAL
int get_rowcol_error;
#endif
int crow, ccol; // cursor is on Crow x Ccol
int offset; // chars scrolled off the screen to the left
int have_status_msg; // is default edit status needed?
// [don't make smallint!]
int last_status_cksum; // hash of current status line
char *current_filename;
char *screenbegin; // index into text[], of top line on the screen
char *screen; // pointer to the virtual screen buffer
int screensize; // and its size
int tabstop;
int last_forward_char; // last char searched for with 'f' (int because of Unicode)
#if ENABLE_FEATURE_VI_CRASHME
char last_input_char; // last char read from user
#endif
#if ENABLE_FEATURE_VI_DOT_CMD
smallint adding2q; // are we currently adding user input to q
int lmc_len; // length of last_modifying_cmd
char *ioq, *ioq_start; // pointer to string for get_one_char to "read"
#endif
#if ENABLE_FEATURE_VI_SEARCH
char *last_search_pattern; // last pattern from a '/' or '?' search
#endif
// former statics
#if ENABLE_FEATURE_VI_YANKMARK
char *edit_file__cur_line;
#endif
int refresh__old_offset;
int format_edit_status__tot;
// a few references only
#if ENABLE_FEATURE_VI_YANKMARK
smalluint YDreg;//,Ureg;// default delete register and orig line for "U"
#define Ureg 27
char *reg[28]; // named register a-z, "D", and "U" 0-25,26,27
char *mark[28]; // user marks points somewhere in text[]- a-z and previous context ''
char *context_start, *context_end;
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS
sigjmp_buf restart; // int_handler() jumps to location remembered here
#endif
struct termios term_orig; // remember what the cooked mode was
#if ENABLE_FEATURE_VI_COLON
char *initial_cmds[3]; // currently 2 entries, NULL terminated
#endif
// Should be just enough to hold a key sequence,
// but CRASHME mode uses it as generated command buffer too
#if ENABLE_FEATURE_VI_CRASHME
char readbuffer[128];
#else
char readbuffer[KEYCODE_BUFFER_SIZE];
#endif
#define STATUS_BUFFER_LEN 200
char status_buffer[STATUS_BUFFER_LEN]; // messages to the user
#if ENABLE_FEATURE_VI_DOT_CMD
char last_modifying_cmd[MAX_INPUT_LEN]; // last modifying cmd for "."
#endif
char get_input_line__buf[MAX_INPUT_LEN]; // former static
char scr_out_buf[MAX_SCR_COLS + MAX_TABSTOP * 2];
#if ENABLE_FEATURE_VI_UNDO
// undo_push() operations
#define UNDO_INS 0
#define UNDO_DEL 1
#define UNDO_INS_CHAIN 2
#define UNDO_DEL_CHAIN 3
// UNDO_*_QUEUED must be equal to UNDO_xxx ORed with UNDO_QUEUED_FLAG
#define UNDO_QUEUED_FLAG 4
#define UNDO_INS_QUEUED 4
#define UNDO_DEL_QUEUED 5
#define UNDO_USE_SPOS 32
#define UNDO_EMPTY 64
// Pass-through flags for functions that can be undone
#define NO_UNDO 0
#define ALLOW_UNDO 1
#define ALLOW_UNDO_CHAIN 2
# if ENABLE_FEATURE_VI_UNDO_QUEUE
#define ALLOW_UNDO_QUEUED 3
char undo_queue_state;
int undo_q;
char *undo_queue_spos; // Start position of queued operation
char undo_queue[CONFIG_FEATURE_VI_UNDO_QUEUE_MAX];
# else
// If undo queuing disabled, don't invoke the missing queue logic
#define ALLOW_UNDO_QUEUED 1
# endif
struct undo_object {
struct undo_object *prev; // Linking back avoids list traversal (LIFO)
int start; // Offset where the data should be restored/deleted
int length; // total data size
uint8_t u_type; // 0=deleted, 1=inserted, 2=swapped
char undo_text[1]; // text that was deleted (if deletion)
} *undo_stack_tail;
#endif /* ENABLE_FEATURE_VI_UNDO */
};
#define G (*ptr_to_globals)
#define text (G.text )
#define text_size (G.text_size )
#define end (G.end )
#define dot (G.dot )
#define reg (G.reg )
#define vi_setops (G.vi_setops )
#define editing (G.editing )
#define cmd_mode (G.cmd_mode )
#define modified_count (G.modified_count )
#define last_modified_count (G.last_modified_count)
#define cmdline_filecnt (G.cmdline_filecnt )
#define cmdcnt (G.cmdcnt )
#define rows (G.rows )
#define columns (G.columns )
#define crow (G.crow )
#define ccol (G.ccol )
#define offset (G.offset )
#define status_buffer (G.status_buffer )
#define have_status_msg (G.have_status_msg )
#define last_status_cksum (G.last_status_cksum )
#define current_filename (G.current_filename )
#define screen (G.screen )
#define screensize (G.screensize )
#define screenbegin (G.screenbegin )
#define tabstop (G.tabstop )
#define last_forward_char (G.last_forward_char )
#if ENABLE_FEATURE_VI_CRASHME
#define last_input_char (G.last_input_char )
#endif
#if ENABLE_FEATURE_VI_READONLY
#define readonly_mode (G.readonly_mode )
#else
#define readonly_mode 0
#endif
#define adding2q (G.adding2q )
#define lmc_len (G.lmc_len )
#define ioq (G.ioq )
#define ioq_start (G.ioq_start )
#define last_search_pattern (G.last_search_pattern)
#define edit_file__cur_line (G.edit_file__cur_line)
#define refresh__old_offset (G.refresh__old_offset)
#define format_edit_status__tot (G.format_edit_status__tot)
#define YDreg (G.YDreg )
//#define Ureg (G.Ureg )
#define mark (G.mark )
#define context_start (G.context_start )
#define context_end (G.context_end )
#define restart (G.restart )
#define term_orig (G.term_orig )
#define initial_cmds (G.initial_cmds )
#define readbuffer (G.readbuffer )
#define scr_out_buf (G.scr_out_buf )
#define last_modifying_cmd (G.last_modifying_cmd )
#define get_input_line__buf (G.get_input_line__buf)
#if ENABLE_FEATURE_VI_UNDO
#define undo_stack_tail (G.undo_stack_tail )
# if ENABLE_FEATURE_VI_UNDO_QUEUE
#define undo_queue_state (G.undo_queue_state)
#define undo_q (G.undo_q )
#define undo_queue (G.undo_queue )
#define undo_queue_spos (G.undo_queue_spos )
# endif
#endif
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
last_modified_count = -1; \
/* "" but has space for 2 chars: */ \
IF_FEATURE_VI_SEARCH(last_search_pattern = xzalloc(2);) \
} while (0)
#if ENABLE_FEATURE_VI_CRASHME
static int crashme = 0;
#endif
static void show_status_line(void); // put a message on the bottom line
static void status_line_bold(const char *, ...);
static void show_help(void)
{
puts("These features are available:"
#if ENABLE_FEATURE_VI_SEARCH
"\n\tPattern searches with / and ?"
#endif
#if ENABLE_FEATURE_VI_DOT_CMD
"\n\tLast command repeat with ."
#endif
#if ENABLE_FEATURE_VI_YANKMARK
"\n\tLine marking with 'x"
"\n\tNamed buffers with \"x"
#endif
#if ENABLE_FEATURE_VI_READONLY
//not implemented: "\n\tReadonly if vi is called as \"view\""
//redundant: usage text says this too: "\n\tReadonly with -R command line arg"
#endif
#if ENABLE_FEATURE_VI_SET
"\n\tSome colon mode commands with :"
#endif
#if ENABLE_FEATURE_VI_SETOPTS
"\n\tSettable options with \":set\""
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS
"\n\tSignal catching- ^C"
"\n\tJob suspend and resume with ^Z"
#endif
#if ENABLE_FEATURE_VI_WIN_RESIZE
"\n\tAdapt to window re-sizes"
#endif
);
}
static void write1(const char *out)
{
fputs(out, stdout);
}
#if ENABLE_FEATURE_VI_WIN_RESIZE
static int query_screen_dimensions(void)
{
int err = get_terminal_width_height(STDIN_FILENO, &columns, &rows);
if (rows > MAX_SCR_ROWS)
rows = MAX_SCR_ROWS;
if (columns > MAX_SCR_COLS)
columns = MAX_SCR_COLS;
return err;
}
#else
static ALWAYS_INLINE int query_screen_dimensions(void)
{
return 0;
}
#endif
// sleep for 'h' 1/100 seconds, return 1/0 if stdin is (ready for read)/(not ready)
static int mysleep(int hund)
{
struct pollfd pfd[1];
if (hund != 0)
fflush_all();
pfd[0].fd = STDIN_FILENO;
pfd[0].events = POLLIN;
return safe_poll(pfd, 1, hund*10) > 0;
}
//----- Set terminal attributes --------------------------------
static void rawmode(void)
{
// no TERMIOS_CLEAR_ISIG: leave ISIG on - allow signals
set_termios_to_raw(STDIN_FILENO, &term_orig, TERMIOS_RAW_CRNL);
}
static void cookmode(void)
{
fflush_all();
tcsetattr_stdin_TCSANOW(&term_orig);
}
//----- Terminal Drawing ---------------------------------------
// The terminal is made up of 'rows' line of 'columns' columns.
// classically this would be 24 x 80.
// screen coordinates
// 0,0 ... 0,79
// 1,0 ... 1,79
// . ... .
// . ... .
// 22,0 ... 22,79
// 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)
{
char cm1[sizeof(ESC_SET_CURSOR_POS) + sizeof(int)*3 * 2];
if (row < 0) row = 0;
if (row >= rows) row = rows - 1;
if (col < 0) col = 0;
if (col >= columns) col = columns - 1;
sprintf(cm1, ESC_SET_CURSOR_POS, row + 1, col + 1);
write1(cm1);
}
//----- Erase from cursor to end of line -----------------------
static void clear_to_eol(void)
{
write1(ESC_CLEAR2EOL);
}
static void go_bottom_and_clear_to_eol(void)
{
place_cursor(rows - 1, 0);
clear_to_eol();
}
//----- Start standout mode ------------------------------------
static void standout_start(void)
{
write1(ESC_BOLD_TEXT);
}
//----- End standout mode --------------------------------------
static void standout_end(void)
{
write1(ESC_NORM_TEXT);
}
//----- Text Movement Routines ---------------------------------
static char *begin_line(char *p) // return pointer to first char cur line
{
if (p > text) {
p = memrchr(text, '\n', p - text);
if (!p)
return text;
return p + 1;
}
return p;
}
static char *end_line(char *p) // return pointer to NL of cur line
{
if (p < end - 1) {
p = memchr(p, '\n', end - p - 1);
if (!p)
return end - 1;
}
return p;
}
static char *dollar_line(char *p) // return pointer to just before NL line
{
p = end_line(p);
// Try to stay off of the Newline
if (*p == '\n' && (p - begin_line(p)) > 0)
p--;
return p;
}
static char *prev_line(char *p) // return pointer first char prev line
{
p = begin_line(p); // goto beginning of cur line
if (p > text && p[-1] == '\n')
p--; // step to prev line
p = begin_line(p); // goto beginning of prev line
return p;
}
static char *next_line(char *p) // return pointer first char next line
{
p = end_line(p);
if (p < end - 1 && *p == '\n')
p++; // step to next line
return p;
}
//----- Text Information Routines ------------------------------
static char *end_screen(void)
{
char *q;
int cnt;
// find new bottom line
q = screenbegin;
for (cnt = 0; cnt < rows - 2; cnt++)
q = next_line(q);
q = end_line(q);
return q;
}
// count line from start to stop
static int count_lines(char *start, char *stop)
{
char *q;
int cnt;
if (stop < start) { // start and stop are backwards- reverse them
q = start;
start = stop;
stop = q;
}
cnt = 0;
stop = end_line(stop);
while (start <= stop && start <= end - 1) {
start = end_line(start);
if (*start == '\n')
cnt++;
start++;
}
return cnt;
}
static char *find_line(int li) // find beginning of line #li
{
char *q;
for (q = text; li > 1; li--) {
q = next_line(q);
}
return q;
}
static int next_tabstop(int col)
{
return col + ((tabstop - 1) - (col % tabstop));
}
//----- Erase the Screen[] memory ------------------------------
static void screen_erase(void)
{
memset(screen, ' ', screensize); // clear new screen
}
static void new_screen(int ro, int co)
{
char *s;
free(screen);
screensize = ro * co + 8;
s = screen = xmalloc(screensize);
// initialize the new screen. assume this will be a empty file.
screen_erase();
// non-existent text[] lines start with a tilde (~).
//screen[(1 * co) + 0] = '~';
//screen[(2 * co) + 0] = '~';
//..
//screen[((ro-2) * co) + 0] = '~';
ro -= 2;
while (--ro >= 0) {
s += co;
*s = '~';
}
}
//----- Synchronize the cursor to Dot --------------------------
static NOINLINE void sync_cursor(char *d, int *row, int *col)
{
char *beg_cur; // begin and end of "d" line
char *tp;
int cnt, ro, co;
beg_cur = begin_line(d); // first char of cur line
if (beg_cur < screenbegin) {
// "d" is before top line on screen
// how many lines do we have to move
cnt = count_lines(beg_cur, screenbegin);
sc1:
screenbegin = beg_cur;
if (cnt > (rows - 1) / 2) {
// we moved too many lines. put "dot" in middle of screen
for (cnt = 0; cnt < (rows - 1) / 2; cnt++) {
screenbegin = prev_line(screenbegin);
}
}
} else {
char *end_scr; // begin and end of screen
end_scr = end_screen(); // last char of screen
if (beg_cur > end_scr) {
// "d" is after bottom line on screen
// how many lines do we have to move
cnt = count_lines(end_scr, beg_cur);
if (cnt > (rows - 1) / 2)
goto sc1; // too many lines
for (ro = 0; ro < cnt - 1; ro++) {
// move screen begin the same amount
screenbegin = next_line(screenbegin);
// now, move the end of screen
end_scr = next_line(end_scr);
end_scr = end_line(end_scr);
}
}
}
// "d" is on screen- find out which row
tp = screenbegin;
for (ro = 0; ro < rows - 1; ro++) { // drive "ro" to correct row
if (tp == beg_cur)
break;
tp = next_line(tp);
}
// find out what col "d" is on
co = 0;
while (tp < d) { // drive "co" to correct column
if (*tp == '\n') //vda || *tp == '\0')
break;
if (*tp == '\t') {
// handle tabs like real vi
if (d == tp && cmd_mode) {
break;
}
co = next_tabstop(co);
} else if ((unsigned char)*tp < ' ' || *tp == 0x7f) {
co++; // display as ^X, use 2 columns
}
co++;
tp++;
}
// "co" is the column where "dot" is.
// The screen has "columns" columns.
// The currently displayed columns are 0+offset -- columns+ofset
// |-------------------------------------------------------------|
// ^ ^ ^
// offset | |------- columns ----------------|
//
// If "co" is already in this range then we do not have to adjust offset
// but, we do have to subtract the "offset" bias from "co".
// If "co" is outside this range then we have to change "offset".
// If the first char of a line is a tab the cursor will try to stay
// in column 7, but we have to set offset to 0.
if (co < 0 + offset) {
offset = co;
}
if (co >= columns + offset) {
offset = co - columns + 1;
}
// if the first char of the line is a tab, and "dot" is sitting on it
// force offset to 0.
if (d == beg_cur && *d == '\t') {
offset = 0;
}
co -= offset;
*row = ro;
*col = co;
}
//----- Format a text[] line into a buffer ---------------------
static char* format_line(char *src /*, int li*/)
{
unsigned char c;
int co;
int ofs = offset;
char *dest = scr_out_buf; // [MAX_SCR_COLS + MAX_TABSTOP * 2]
c = '~'; // char in col 0 in non-existent lines is '~'
co = 0;
while (co < columns + tabstop) {
// have we gone past the end?
if (src < end) {
c = *src++;
if (c == '\n')
break;
if ((c & 0x80) && !Isprint(c)) {
c = '.';
}
if (c < ' ' || c == 0x7f) {
if (c == '\t') {
c = ' ';
// co % 8 != 7
while ((co % tabstop) != (tabstop - 1)) {
dest[co++] = c;
}
} else {
dest[co++] = '^';
if (c == 0x7f)
c = '?';
else
c += '@'; // Ctrl-X -> 'X'
}
}
}
dest[co++] = c;
// discard scrolled-off-to-the-left portion,
// in tabstop-sized pieces
if (ofs >= tabstop && co >= tabstop) {
memmove(dest, dest + tabstop, co);
co -= tabstop;
ofs -= tabstop;
}
if (src >= end)
break;
}
// check "short line, gigantic offset" case
if (co < ofs)
ofs = co;
// discard last scrolled off part
co -= ofs;
dest += ofs;
// fill the rest with spaces
if (co < columns)
memset(&dest[co], ' ', columns - co);
return dest;
}
//----- Refresh the changed screen lines -----------------------
// Copy the source line from text[] into the buffer and note
// if the current screenline is different from the new buffer.
// If they differ then that line needs redrawing on the terminal.
//
static void refresh(int full_screen)
{
#define old_offset refresh__old_offset
int li, changed;
char *tp, *sp; // pointer into text[] and screen[]
if (ENABLE_FEATURE_VI_WIN_RESIZE IF_FEATURE_VI_ASK_TERMINAL(&& !G.get_rowcol_error) ) {
unsigned c = columns, r = rows;
query_screen_dimensions();
#if ENABLE_FEATURE_VI_USE_SIGNALS
full_screen |= (c - columns) | (r - rows);
#else
if (c != columns || r != rows) {
full_screen = TRUE;
// update screen memory since SIGWINCH won't have done it
new_screen(rows, columns);
}
#endif
}
sync_cursor(dot, &crow, &ccol); // where cursor will be (on "dot")
tp = screenbegin; // index into text[] of top line
// compare text[] to screen[] and mark screen[] lines that need updating
for (li = 0; li < rows - 1; li++) {
int cs, ce; // column start & end
char *out_buf;
// format current text line
out_buf = format_line(tp /*, li*/);
// skip to the end of the current text[] line
if (tp < end) {
char *t = memchr(tp, '\n', end - tp);
if (!t) t = end - 1;
tp = t + 1;
}
// see if there are any changes between virtual screen and out_buf
changed = FALSE; // assume no change
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
goto re0;
}
// compare newly formatted buffer with virtual screen
// look forward for first difference between buf and screen
for (; cs <= ce; cs++) {
if (out_buf[cs] != sp[cs]) {
changed = TRUE; // mark for redraw
break;
}
}
// look backward for last difference between out_buf and screen
for (; ce >= cs; ce--) {
if (out_buf[ce] != sp[ce]) {
changed = TRUE; // mark for redraw
break;
}
}
// now, cs is index of first diff, and ce is index of last diff
// if horz offset has changed, force a redraw
if (offset != old_offset) {
re0:
changed = TRUE;
}
// 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; }
// is there a change between virtual screen and out_buf
if (changed) {
// copy changed part of buffer to virtual screen
memcpy(sp+cs, out_buf+cs, ce-cs+1);
place_cursor(li, cs);
// write line out to terminal
fwrite(&sp[cs], ce - cs + 1, 1, stdout);
}
}
place_cursor(crow, ccol);
old_offset = offset;
#undef old_offset
}
//----- Force refresh of all Lines -----------------------------
static void redraw(int full_screen)
{
// cursor to top,left; clear to the end of screen
write1(ESC_SET_CURSOR_TOPLEFT ESC_CLEAR2EOS);
screen_erase(); // erase the internal screen buffer
last_status_cksum = 0; // force status update
refresh(full_screen); // this will redraw the entire display
show_status_line();
}
//----- Flash the screen --------------------------------------
static void flash(int h)
{
standout_start();
redraw(TRUE);
mysleep(h);
standout_end();
redraw(TRUE);
}
static void indicate_error(void)
{
#if ENABLE_FEATURE_VI_CRASHME
if (crashme > 0)
return;
#endif
if (!err_method) {
write1(ESC_BELL);
} else {
flash(10);
}
}
//----- IO Routines --------------------------------------------
static int readit(void) // read (maybe cursor) key from stdin
{
int c;
fflush_all();
// Wait for input. TIMEOUT = -1 makes read_key wait even
// on nonblocking stdin.
// Note: read_key sets errno to 0 on success.
again:
c = read_key(STDIN_FILENO, readbuffer, /*timeout:*/ -1);
if (c == -1) { // EOF/error
if (errno == EAGAIN) // paranoia
goto again;
go_bottom_and_clear_to_eol();
cookmode(); // terminal to "cooked"
bb_simple_error_msg_and_die("can't read user input");
}
return c;
}
#if ENABLE_FEATURE_VI_DOT_CMD
static int get_one_char(void)
{
int c;
if (!adding2q) {
// we are not adding to the q.
// but, we may be reading from a saved q.
// (checking "ioq" for NULL is wrong, it's not reset to NULL
// when done - "ioq_start" is reset instead).
if (ioq_start != NULL) {
// there is a queue to get chars from.
// careful with correct sign expansion!
c = (unsigned char)*ioq++;
if (c != '\0')
return c;
// the end of the q
free(ioq_start);
ioq_start = NULL;
// read from STDIN:
}
return readit();
}
// we are adding STDIN chars to q.
c = readit();
if (lmc_len >= ARRAY_SIZE(last_modifying_cmd) - 1) {
// last_modifying_cmd[] is too small, can't remeber the cmd
// - drop it
adding2q = 0;
lmc_len = 0;
} else {
last_modifying_cmd[lmc_len++] = c;
}
return c;
}
#else
# define get_one_char() readit()
#endif
// Get input line (uses "status line" area)
static char *get_input_line(const char *prompt)
{
// char [MAX_INPUT_LEN]
#define buf get_input_line__buf
int c;
int i;
strcpy(buf, prompt);
last_status_cksum = 0; // force status update
go_bottom_and_clear_to_eol();
write1(prompt); // write out the :, /, or ? prompt
i = strlen(buf);
while (i < MAX_INPUT_LEN) {
c = get_one_char();
if (c == '\n' || c == '\r' || c == 27)
break; // this is end of input
if (c == term_orig.c_cc[VERASE] || c == 8 || c == 127) {
// user wants to erase prev char
buf[--i] = '\0';
write1("\b \b"); // erase char on screen
if (i <= 0) // user backs up before b-o-l, exit
break;
} else if (c > 0 && c < 256) { // exclude Unicode
// (TODO: need to handle Unicode)
buf[i] = c;
buf[++i] = '\0';
bb_putchar(c);
}
}
refresh(FALSE);
return buf;
#undef buf
}
static void Hit_Return(void)
{
int c;
standout_start();
write1("[Hit return to continue]");
standout_end();
while ((c = get_one_char()) != '\n' && c != '\r')
continue;
redraw(TRUE); // force redraw all
}
//----- Draw the status line at bottom of the screen -------------
// show file status on status line
static int format_edit_status(void)
{
static const char cmd_mode_indicator[] ALIGN1 = "-IR-";
#define tot format_edit_status__tot
int cur, percent, ret, trunc_at;
// modified_count is now a counter rather than a flag. this
// helps reduce the amount of line counting we need to do.
// (this will cause a mis-reporting of modified status
// once every MAXINT editing operations.)
// it would be nice to do a similar optimization here -- if
// we haven't done a motion that could have changed which line
// we're on, then we shouldn't have to do this count_lines()
cur = count_lines(text, dot);
// count_lines() is expensive.
// Call it only if something was changed since last time
// we were here:
if (modified_count != last_modified_count) {
tot = cur + count_lines(dot, end - 1) - 1;
last_modified_count = modified_count;
}
// current line percent
// ------------- ~~ ----------
// total lines 100
if (tot > 0) {
percent = (100 * cur) / tot;
} else {
cur = tot = 0;
percent = 100;
}
trunc_at = columns < STATUS_BUFFER_LEN-1 ?
columns : STATUS_BUFFER_LEN-1;
ret = snprintf(status_buffer, trunc_at+1,
#if ENABLE_FEATURE_VI_READONLY
"%c %s%s%s %d/%d %d%%",
#else
"%c %s%s %d/%d %d%%",
#endif
cmd_mode_indicator[cmd_mode & 3],
(current_filename != NULL ? current_filename : "No file"),
#if ENABLE_FEATURE_VI_READONLY
(readonly_mode ? " [Readonly]" : ""),
#endif
(modified_count ? " [Modified]" : ""),
cur, tot, percent);
if (ret >= 0 && ret < trunc_at)
return ret; // it all fit
return trunc_at; // had to truncate
#undef tot
}
static int bufsum(char *buf, int count)
{
int sum = 0;
char *e = buf + count;
while (buf < e)
sum += (unsigned char) *buf++;
return sum;
}
static void show_status_line(void)
{
int cnt = 0, cksum = 0;
// either we already have an error or status message, or we
// create one.
if (!have_status_msg) {
cnt = format_edit_status();
cksum = bufsum(status_buffer, cnt);
}
if (have_status_msg || ((cnt > 0 && last_status_cksum != cksum))) {
last_status_cksum = cksum; // remember if we have seen this line
go_bottom_and_clear_to_eol();
write1(status_buffer);
if (have_status_msg) {
if (((int)strlen(status_buffer) - (have_status_msg - 1)) >
(columns - 1) ) {
have_status_msg = 0;
Hit_Return();
}
have_status_msg = 0;
}
place_cursor(crow, ccol); // put cursor back in correct place
}
fflush_all();
}
//----- format the status buffer, the bottom line of screen ------
static void status_line(const char *format, ...)
{
va_list args;
va_start(args, format);
vsnprintf(status_buffer, STATUS_BUFFER_LEN, format, args);
va_end(args);
have_status_msg = 1;
}
static void status_line_bold(const char *format, ...)
{
va_list args;
va_start(args, format);
strcpy(status_buffer, ESC_BOLD_TEXT);
vsnprintf(status_buffer + (sizeof(ESC_BOLD_TEXT)-1),
STATUS_BUFFER_LEN - sizeof(ESC_BOLD_TEXT) - sizeof(ESC_NORM_TEXT),
format, args
);
strcat(status_buffer, ESC_NORM_TEXT);
va_end(args);
have_status_msg = 1 + (sizeof(ESC_BOLD_TEXT)-1) + (sizeof(ESC_NORM_TEXT)-1);
}
static void status_line_bold_errno(const char *fn)
{
status_line_bold("'%s' "STRERROR_FMT, fn STRERROR_ERRNO);
}
// copy s to buf, convert unprintable
static void print_literal(char *buf, const char *s)
{
char *d;
unsigned char c;
buf[0] = '\0';
if (!s[0])
s = "(NULL)";
d = buf;
for (; *s; s++) {
int c_is_no_print;
c = *s;
c_is_no_print = (c & 0x80) && !Isprint(c);
if (c_is_no_print) {
strcpy(d, ESC_NORM_TEXT);
d += sizeof(ESC_NORM_TEXT)-1;
c = '.';
}
if (c < ' ' || c == 0x7f) {
*d++ = '^';
c |= '@'; // 0x40
if (c == 0x7f)
c = '?';
}
*d++ = c;
*d = '\0';
if (c_is_no_print) {
strcpy(d, ESC_BOLD_TEXT);
d += sizeof(ESC_BOLD_TEXT)-1;
}
if (*s == '\n') {
*d++ = '$';
*d = '\0';
}
if (d - buf > MAX_INPUT_LEN - 10) // paranoia
break;
}
}
static void not_implemented(const char *s)
{
char buf[MAX_INPUT_LEN];
print_literal(buf, s);
status_line_bold("'%s' is not implemented", buf);
}
//----- Block insert/delete, undo ops --------------------------
#if ENABLE_FEATURE_VI_YANKMARK
static char *text_yank(char *p, char *q, int dest) // copy text into a register
{
int cnt = q - p;
if (cnt < 0) { // they are backwards- reverse them
p = q;
cnt = -cnt;
}
free(reg[dest]); // if already a yank register, free it
reg[dest] = xstrndup(p, cnt + 1);
return p;
}
static char what_reg(void)
{
char c;
c = 'D'; // default to D-reg
if (YDreg <= 25)
c = 'a' + (char) YDreg;
if (YDreg == 26)
c = 'D';
if (YDreg == 27)
c = 'U';
return c;
}
static void check_context(char cmd)
{
// A context is defined to be "modifying text"
// Any modifying command establishes a new context.
if (dot < context_start || dot > context_end) {
if (strchr(modifying_cmds, cmd) != NULL) {
// we are trying to modify text[]- make this the current context
mark[27] = mark[26]; // move cur to prev
mark[26] = dot; // move local to cur
context_start = prev_line(prev_line(dot));
context_end = next_line(next_line(dot));
//loiter= start_loiter= now;
}
}
}
static char *swap_context(char *p) // goto new context for '' command make this the current context
{
char *tmp;
// the current context is in mark[26]
// the previous context is in mark[27]
// only swap context if other context is valid
if (text <= mark[27] && mark[27] <= end - 1) {
tmp = mark[27];
mark[27] = p;
mark[26] = p = tmp;
context_start = prev_line(prev_line(prev_line(p)));
context_end = next_line(next_line(next_line(p)));
}
return p;
}
#endif /* FEATURE_VI_YANKMARK */
#if ENABLE_FEATURE_VI_UNDO
static void undo_push(char *, unsigned, unsigned char);
#endif
// open a hole in text[]
// might reallocate text[]! use p += text_hole_make(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t text_hole_make(char *p, int size) // at "p", make a 'size' byte hole
{
uintptr_t bias = 0;
if (size <= 0)
return bias;
end += size; // adjust the new END
if (end >= (text + text_size)) {
char *new_text;
text_size += end - (text + text_size) + 10240;
new_text = xrealloc(text, text_size);
bias = (new_text - text);
screenbegin += bias;
dot += bias;
end += bias;
p += bias;
#if ENABLE_FEATURE_VI_YANKMARK
{
int i;
for (i = 0; i < ARRAY_SIZE(mark); i++)
if (mark[i])
mark[i] += bias;
}
#endif
text = new_text;
}
memmove(p + size, p, end - size - p);
memset(p, ' ', size); // clear new hole
return bias;
}
// close a hole in text[] - delete "p" through "q", inclusive
// "undo" value indicates if this operation should be undo-able
#if !ENABLE_FEATURE_VI_UNDO
#define text_hole_delete(a,b,c) text_hole_delete(a,b)
#endif
static char *text_hole_delete(char *p, char *q, int undo)
{
char *src, *dest;
int cnt, hole_size;
// move forwards, from beginning
// assume p <= q
src = q + 1;
dest = p;
if (q < p) { // they are backward- swap them
src = p + 1;
dest = q;
}
hole_size = q - p + 1;
cnt = end - src;
#if ENABLE_FEATURE_VI_UNDO
switch (undo) {
case NO_UNDO:
break;
case ALLOW_UNDO:
undo_push(p, hole_size, UNDO_DEL);
break;
case ALLOW_UNDO_CHAIN:
undo_push(p, hole_size, UNDO_DEL_CHAIN);
break;
# if ENABLE_FEATURE_VI_UNDO_QUEUE
case ALLOW_UNDO_QUEUED:
undo_push(p, hole_size, UNDO_DEL_QUEUED);
break;
# endif
}
modified_count--;
#endif
if (src < text || src > end)
goto thd0;
if (dest < text || dest >= end)
goto thd0;
modified_count++;
if (src >= end)
goto thd_atend; // just delete the end of the buffer
memmove(dest, src, cnt);
thd_atend:
end = end - hole_size; // adjust the new END
if (dest >= end)
dest = end - 1; // make sure dest in below end-1
if (end <= text)
dest = end = text; // keep pointers valid
thd0:
return dest;
}
#if ENABLE_FEATURE_VI_UNDO
# if ENABLE_FEATURE_VI_UNDO_QUEUE
// Flush any queued objects to the undo stack
static void undo_queue_commit(void)
{
// Pushes the queue object onto the undo stack
if (undo_q > 0) {
// Deleted character undo events grow from the end
undo_push(undo_queue + CONFIG_FEATURE_VI_UNDO_QUEUE_MAX - undo_q,
undo_q,
(undo_queue_state | UNDO_USE_SPOS)
);
undo_queue_state = UNDO_EMPTY;
undo_q = 0;
}
}
# else
# define undo_queue_commit() ((void)0)
# endif
static void flush_undo_data(void)
{
struct undo_object *undo_entry;
while (undo_stack_tail) {
undo_entry = undo_stack_tail;
undo_stack_tail = undo_entry->prev;
free(undo_entry);
}
}
// Undo functions and hooks added by Jody Bruchon (jody@jodybruchon.com)
// Add to the undo stack
static void undo_push(char *src, unsigned length, uint8_t u_type)
{
struct undo_object *undo_entry;
// "u_type" values
// UNDO_INS: insertion, undo will remove from buffer
// UNDO_DEL: deleted text, undo will restore to buffer
// UNDO_{INS,DEL}_CHAIN: Same as above but also calls undo_pop() when complete
// The CHAIN operations are for handling multiple operations that the user
// performs with a single action, i.e. REPLACE mode or find-and-replace commands
// UNDO_{INS,DEL}_QUEUED: If queuing feature is enabled, allow use of the queue
// for the INS/DEL operation. The raw values should be equal to the values of
// UNDO_{INS,DEL} ORed with UNDO_QUEUED_FLAG
# if ENABLE_FEATURE_VI_UNDO_QUEUE
// This undo queuing functionality groups multiple character typing or backspaces
// into a single large undo object. This greatly reduces calls to malloc() for
// single-character operations while typing and has the side benefit of letting
// an undo operation remove chunks of text rather than a single character.
switch (u_type) {
case UNDO_EMPTY: // Just in case this ever happens...
return;
case UNDO_DEL_QUEUED:
if (length != 1)
return; // Only queue single characters
switch (undo_queue_state) {
case UNDO_EMPTY:
undo_queue_state = UNDO_DEL;
case UNDO_DEL:
undo_queue_spos = src;
undo_q++;
undo_queue[CONFIG_FEATURE_VI_UNDO_QUEUE_MAX - undo_q] = *src;
// If queue is full, dump it into an object
if (undo_q == CONFIG_FEATURE_VI_UNDO_QUEUE_MAX)
undo_queue_commit();
return;
case UNDO_INS:
// Switch from storing inserted text to deleted text
undo_queue_commit();
undo_push(src, length, UNDO_DEL_QUEUED);
return;
}
break;
case UNDO_INS_QUEUED:
if (length < 1)
return;
switch (undo_queue_state) {
case UNDO_EMPTY:
undo_queue_state = UNDO_INS;
undo_queue_spos = src;
case UNDO_INS:
while (length--) {
undo_q++; // Don't need to save any data for insertions
if (undo_q == CONFIG_FEATURE_VI_UNDO_QUEUE_MAX)
undo_queue_commit();
}
return;
case UNDO_DEL:
// Switch from storing deleted text to inserted text
undo_queue_commit();
undo_push(src, length, UNDO_INS_QUEUED);
return;
}
break;
}
# else
// If undo queuing is disabled, ignore the queuing flag entirely
u_type = u_type & ~UNDO_QUEUED_FLAG;
# endif
// Allocate a new undo object
if (u_type == UNDO_DEL || u_type == UNDO_DEL_CHAIN) {
// For UNDO_DEL objects, save deleted text
if ((text + length) == end)
length--;
// If this deletion empties text[], strip the newline. When the buffer becomes
// zero-length, a newline is added back, which requires this to compensate.
undo_entry = xzalloc(offsetof(struct undo_object, undo_text) + length);
memcpy(undo_entry->undo_text, src, length);
} else {
undo_entry = xzalloc(sizeof(*undo_entry));
}
undo_entry->length = length;
# if ENABLE_FEATURE_VI_UNDO_QUEUE
if ((u_type & UNDO_USE_SPOS) != 0) {
undo_entry->start = undo_queue_spos - text; // use start position from queue
} else {
undo_entry->start = src - text; // use offset from start of text buffer
}
u_type = (u_type & ~UNDO_USE_SPOS);
# else
undo_entry->start = src - text;
# endif
undo_entry->u_type = u_type;
// Push it on undo stack
undo_entry->prev = undo_stack_tail;
undo_stack_tail = undo_entry;
modified_count++;
}
static void undo_push_insert(char *p, int len, int undo)
{
switch (undo) {
case ALLOW_UNDO:
undo_push(p, len, UNDO_INS);
break;
case ALLOW_UNDO_CHAIN:
undo_push(p, len, UNDO_INS_CHAIN);
break;
# if ENABLE_FEATURE_VI_UNDO_QUEUE
case ALLOW_UNDO_QUEUED:
undo_push(p, len, UNDO_INS_QUEUED);
break;
# endif
}
}
// Undo the last operation
static void undo_pop(void)
{
int repeat;
char *u_start, *u_end;
struct undo_object *undo_entry;
// Commit pending undo queue before popping (should be unnecessary)
undo_queue_commit();
undo_entry = undo_stack_tail;
// Check for an empty undo stack
if (!undo_entry) {
status_line("Already at oldest change");
return;
}
switch (undo_entry->u_type) {
case UNDO_DEL:
case UNDO_DEL_CHAIN:
// make hole and put in text that was deleted; deallocate text
u_start = text + undo_entry->start;
text_hole_make(u_start, undo_entry->length);
memcpy(u_start, undo_entry->undo_text, undo_entry->length);
status_line("Undo [%d] %s %d chars at position %d",
modified_count, "restored",
undo_entry->length, undo_entry->start
);
break;
case UNDO_INS:
case UNDO_INS_CHAIN:
// delete what was inserted
u_start = undo_entry->start + text;
u_end = u_start - 1 + undo_entry->length;
text_hole_delete(u_start, u_end, NO_UNDO);
status_line("Undo [%d] %s %d chars at position %d",
modified_count, "deleted",
undo_entry->length, undo_entry->start
);
break;
}
repeat = 0;
switch (undo_entry->u_type) {
// If this is the end of a chain, lower modification count and refresh display
case UNDO_DEL:
case UNDO_INS:
dot = (text + undo_entry->start);
refresh(FALSE);
break;
case UNDO_DEL_CHAIN:
case UNDO_INS_CHAIN:
repeat = 1;
break;
}
// Deallocate the undo object we just processed
undo_stack_tail = undo_entry->prev;
free(undo_entry);
modified_count--;
// For chained operations, continue popping all the way down the chain.
if (repeat) {
undo_pop(); // Follow the undo chain if one exists
}
}
#else
# define flush_undo_data() ((void)0)
# define undo_queue_commit() ((void)0)
#endif /* ENABLE_FEATURE_VI_UNDO */
//----- Dot Movement Routines ----------------------------------
static void dot_left(void)
{
undo_queue_commit();
if (dot > text && dot[-1] != '\n')
dot--;
}
static void dot_right(void)
{
undo_queue_commit();
if (dot < end - 1 && *dot != '\n')
dot++;
}
static void dot_begin(void)
{
undo_queue_commit();
dot = begin_line(dot); // return pointer to first char cur line
}
static void dot_end(void)
{
undo_queue_commit();
dot = end_line(dot); // return pointer to last char cur line
}
static char *move_to_col(char *p, int l)
{
int co;
p = begin_line(p);
co = 0;
while (co < l && p < end) {
if (*p == '\n') //vda || *p == '\0')
break;
if (*p == '\t') {
co = next_tabstop(co);
} else if (*p < ' ' || *p == 127) {
co++; // display as ^X, use 2 columns
}
co++;
p++;
}
return p;
}
static void dot_next(void)
{
undo_queue_commit();
dot = next_line(dot);
}
static void dot_prev(void)
{
undo_queue_commit();
dot = prev_line(dot);
}
static void dot_skip_over_ws(void)
{
// skip WS
while (isspace(*dot) && *dot != '\n' && dot < end - 1)
dot++;
}
static void dot_scroll(int cnt, int dir)
{
char *q;
undo_queue_commit();
for (; cnt > 0; cnt--) {
if (dir < 0) {
// scroll Backwards
// ctrl-Y scroll up one line
screenbegin = prev_line(screenbegin);
} else {
// scroll Forwards
// ctrl-E scroll down one line
screenbegin = next_line(screenbegin);
}
}
// make sure "dot" stays on the screen so we dont scroll off
if (dot < screenbegin)
dot = screenbegin;
q = end_screen(); // find new bottom line
if (dot > q)
dot = begin_line(q); // is dot is below bottom line?
dot_skip_over_ws();
}
static char *bound_dot(char *p) // make sure text[0] <= P < "end"
{
if (p >= end && end > text) {
p = end - 1;
indicate_error();
}
if (p < text) {
p = text;
indicate_error();
}
return p;
}
#if ENABLE_FEATURE_VI_DOT_CMD
static void start_new_cmd_q(char c)
{
// get buffer for new cmd
// if there is a current cmd count put it in the buffer first
if (cmdcnt > 0) {
lmc_len = sprintf(last_modifying_cmd, "%u%c", cmdcnt, c);
} else { // just save char c onto queue
last_modifying_cmd[0] = c;
lmc_len = 1;
}
adding2q = 1;
}
static void end_cmd_q(void)
{
# if ENABLE_FEATURE_VI_YANKMARK
YDreg = 26; // go back to default Yank/Delete reg
# endif
adding2q = 0;
}
#else
# define end_cmd_q() ((void)0)
#endif /* FEATURE_VI_DOT_CMD */
// copy text into register, then delete text.
// if dist <= 0, do not include, or go past, a NewLine
//
#if !ENABLE_FEATURE_VI_UNDO
#define yank_delete(a,b,c,d,e) yank_delete(a,b,c,d)
#endif
static char *yank_delete(char *start, char *stop, int dist, int yf, int undo)
{
char *p;
// make sure start <= stop
if (start > stop) {
// they are backwards, reverse them
p = start;
start = stop;
stop = p;
}
if (dist <= 0) {
// we cannot cross NL boundaries
p = start;
if (*p == '\n')
return p;
// dont go past a NewLine
for (; p + 1 <= stop; p++) {
if (p[1] == '\n') {
stop = p; // "stop" just before NewLine
break;
}
}
}
p = start;
#if ENABLE_FEATURE_VI_YANKMARK
text_yank(start, stop, YDreg);
#endif
if (yf == YANKDEL) {
p = text_hole_delete(start, stop, undo);
} // delete lines
return p;
}
// might reallocate text[]!
static int file_insert(const char *fn, char *p, int initial)
{
int cnt = -1;
int fd, size;
struct stat statbuf;
if (p < text)
p = text;
if (p > end)
p = end;
fd = open(fn, O_RDONLY);
if (fd < 0) {
if (!initial)
status_line_bold_errno(fn);
return cnt;
}
// Validate file
if (fstat(fd, &statbuf) < 0) {
status_line_bold_errno(fn);
goto fi;
}
if (!S_ISREG(statbuf.st_mode)) {
status_line_bold("'%s' is not a regular file", fn);
goto fi;
}
size = (statbuf.st_size < INT_MAX ? (int)statbuf.st_size : INT_MAX);
p += text_hole_make(p, size);
cnt = full_read(fd, p, size);
if (cnt < 0) {
status_line_bold_errno(fn);
p = text_hole_delete(p, p + size - 1, NO_UNDO); // un-do buffer insert
} else if (cnt < size) {
// There was a partial read, shrink unused space
p = text_hole_delete(p + cnt, p + size - 1, NO_UNDO);
status_line_bold("can't read '%s'", fn);
}
fi:
close(fd);
#if ENABLE_FEATURE_VI_READONLY
if (initial
&& ((access(fn, W_OK) < 0) ||
// root will always have access()
// so we check fileperms too
!(statbuf.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH))
)
) {
SET_READONLY_FILE(readonly_mode);
}
#endif
return cnt;
}
// find matching char of pair () [] {}
// will crash if c is not one of these
static char *find_pair(char *p, const char c)
{
const char *braces = "()[]{}";
char match;
int dir, level;
dir = strchr(braces, c) - braces;
dir ^= 1;
match = braces[dir];
dir = ((dir & 1) << 1) - 1; // 1 for ([{, -1 for )\}
// look for match, count levels of pairs (( ))
level = 1;
for (;;) {
p += dir;
if (p < text || p >= end)
return NULL;
if (*p == c)
level++; // increase pair levels
if (*p == match) {
level--; // reduce pair level
if (level == 0)
return p; // found matching pair
}
}
}
#if ENABLE_FEATURE_VI_SETOPTS
// show the matching char of a pair, () [] {}
static void showmatching(char *p)
{
char *q, *save_dot;
// we found half of a pair
q = find_pair(p, *p); // get loc of matching char
if (q == NULL) {
indicate_error(); // no matching char
} else {
// "q" now points to matching pair
save_dot = dot; // remember where we are
dot = q; // go to new loc
refresh(FALSE); // let the user see it
mysleep(40); // give user some time
dot = save_dot; // go back to old loc
refresh(FALSE);
}
}
#endif /* FEATURE_VI_SETOPTS */
// might reallocate text[]! use p += stupid_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t stupid_insert(char *p, char c) // stupidly insert the char c at 'p'
{
uintptr_t bias;
bias = text_hole_make(p, 1);
p += bias;
*p = c;
return bias;
}
#if !ENABLE_FEATURE_VI_UNDO
#define char_insert(a,b,c) char_insert(a,b)
#endif
static char *char_insert(char *p, char c, int undo) // insert the char c at 'p'
{
if (c == 22) { // Is this an ctrl-V?
p += stupid_insert(p, '^'); // use ^ to indicate literal next
refresh(FALSE); // show the ^
c = get_one_char();
*p = c;
#if ENABLE_FEATURE_VI_UNDO
undo_push_insert(p, 1, undo);
#else
modified_count++;
#endif
p++;
} else if (c == 27) { // Is this an ESC?
cmd_mode = 0;
undo_queue_commit();
cmdcnt = 0;
end_cmd_q(); // stop adding to q
last_status_cksum = 0; // force status update
if ((p[-1] != '\n') && (dot > text)) {
p--;
}
} else if (c == term_orig.c_cc[VERASE] || c == 8 || c == 127) { // Is this a BS
if (p > text) {
p--;
p = text_hole_delete(p, p, ALLOW_UNDO_QUEUED); // shrink buffer 1 char
}
} else {
// insert a char into text[]
if (c == 13)
c = '\n'; // translate \r to \n
#if ENABLE_FEATURE_VI_UNDO
# if ENABLE_FEATURE_VI_UNDO_QUEUE
if (c == '\n')
undo_queue_commit();
# endif
undo_push_insert(p, 1, undo);
#else
modified_count++;
#endif
p += 1 + stupid_insert(p, c); // insert the char
#if ENABLE_FEATURE_VI_SETOPTS
if (showmatch && strchr(")]}", c) != NULL) {
showmatching(p - 1);
}
if (autoindent && c == '\n') { // auto indent the new line
char *q;
size_t len;
q = prev_line(p); // use prev line as template
len = strspn(q, " \t"); // space or tab
if (len) {
uintptr_t bias;
bias = text_hole_make(p, len);
p += bias;
q += bias;
#if ENABLE_FEATURE_VI_UNDO
undo_push_insert(p, len, undo);
#endif
memcpy(p, q, len);
p += len;
}
}
#endif
}
return p;
}
// read text from file or create an empty buf
// will also update current_filename
static int init_text_buffer(char *fn)
{
int rc;
// allocate/reallocate text buffer
free(text);
text_size = 10240;
screenbegin = dot = end = text = xzalloc(text_size);
if (fn != current_filename) {
free(current_filename);
current_filename = xstrdup(fn);
}
rc = file_insert(fn, text, 1);
if (rc < 0) {
// file doesnt exist. Start empty buf with dummy line
char_insert(text, '\n', NO_UNDO);
}
flush_undo_data();
modified_count = 0;
last_modified_count = -1;
#if ENABLE_FEATURE_VI_YANKMARK
// init the marks
memset(mark, 0, sizeof(mark));
#endif
return rc;
}
#if ENABLE_FEATURE_VI_YANKMARK \
|| (ENABLE_FEATURE_VI_COLON && ENABLE_FEATURE_VI_SEARCH) \
|| ENABLE_FEATURE_VI_CRASHME
// might reallocate text[]! use p += string_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
# if !ENABLE_FEATURE_VI_UNDO
# define string_insert(a,b,c) string_insert(a,b)
# endif
static uintptr_t string_insert(char *p, const char *s, int undo) // insert the string at 'p'
{
uintptr_t bias;
int i;
i = strlen(s);
#if ENABLE_FEATURE_VI_UNDO
undo_push_insert(p, i, undo);
#endif
bias = text_hole_make(p, i);
p += bias;
memcpy(p, s, i);
#if ENABLE_FEATURE_VI_YANKMARK
{
int cnt;
for (cnt = 0; *s != '\0'; s++) {
if (*s == '\n')
cnt++;
}
status_line("Put %d lines (%d chars) from [%c]", cnt, i, what_reg());
}
#endif
return bias;
}
#endif
static int file_write(char *fn, char *first, char *last)
{
int fd, cnt, charcnt;
if (fn == 0) {
status_line_bold("No current filename");
return -2;
}
// By popular request we do not open file with O_TRUNC,
// but instead ftruncate() it _after_ successful write.
// Might reduce amount of data lost on power fail etc.
fd = open(fn, (O_WRONLY | O_CREAT), 0666);
if (fd < 0)
return -1;
cnt = last - first + 1;
charcnt = full_write(fd, first, cnt);
ftruncate(fd, charcnt);
if (charcnt == cnt) {
// good write
//modified_count = FALSE;
} else {
charcnt = 0;
}
close(fd);
return charcnt;
}
#if ENABLE_FEATURE_VI_SEARCH
# if ENABLE_FEATURE_VI_REGEX_SEARCH
// search for pattern starting at p
static char *char_search(char *p, const char *pat, int dir_and_range)
{
struct re_pattern_buffer preg;
const char *err;
char *q;
int i;
int size;
int range;
re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
if (ignorecase)
re_syntax_options = RE_SYNTAX_POSIX_EXTENDED | RE_ICASE;
memset(&preg, 0, sizeof(preg));
err = re_compile_pattern(pat, strlen(pat), &preg);
if (err != NULL) {
status_line_bold("bad search pattern '%s': %s", pat, err);
return p;
}
range = (dir_and_range & 1);
q = end - 1; // if FULL
if (range == LIMITED)
q = next_line(p);
if (dir_and_range < 0) { // BACK?
q = text;
if (range == LIMITED)
q = prev_line(p);
}
// RANGE could be negative if we are searching backwards
range = q - p;
q = p;
size = range;
if (range < 0) {
size = -size;
q = p - size;
if (q < text)
q = text;
}
// search for the compiled pattern, preg, in p[]
// range < 0: search backward
// range > 0: search forward
// 0 < start < size
// re_search() < 0: not found or error
// re_search() >= 0: index of found pattern
// struct pattern char int int int struct reg
// re_search(*pattern_buffer, *string, size, start, range, *regs)
i = re_search(&preg, q, size, /*start:*/ 0, range, /*struct re_registers*:*/ NULL);
regfree(&preg);
if (i < 0)
return NULL;
if (dir_and_range > 0) // FORWARD?
p = p + i;
else
p = p - i;
return p;
}
# else
# if ENABLE_FEATURE_VI_SETOPTS
static int mycmp(const char *s1, const char *s2, int len)
{
if (ignorecase) {
return strncasecmp(s1, s2, len);
}
return strncmp(s1, s2, len);
}
# else
# define mycmp strncmp
# endif
static char *char_search(char *p, const char *pat, int dir_and_range)
{
char *start, *stop;
int len;
int range;
len = strlen(pat);
range = (dir_and_range & 1);
if (dir_and_range > 0) { //FORWARD?
stop = end - 1; // assume range is p..end-1
if (range == LIMITED)
stop = next_line(p); // range is to next line
for (start = p; start < stop; start++) {
if (mycmp(start, pat, len) == 0) {
return start;
}
}
} else { //BACK
stop = text; // assume range is text..p
if (range == LIMITED)
stop = prev_line(p); // range is to prev line
for (start = p - len; start >= stop; start--) {
if (mycmp(start, pat, len) == 0) {
return start;
}
}
}
// pattern not found
return NULL;
}
# endif
#endif /* FEATURE_VI_SEARCH */
//----- The Colon commands -------------------------------------
#if ENABLE_FEATURE_VI_COLON
static char *get_one_address(char *p, int *addr) // get colon addr, if present
{
int st;
char *q;
IF_FEATURE_VI_YANKMARK(char c;)
*addr = -1; // assume no addr
if (*p == '.') { // the current line
p++;
q = begin_line(dot);
*addr = count_lines(text, q);
}
#if ENABLE_FEATURE_VI_YANKMARK
else if (*p == '\'') { // is this a mark addr
p++;
c = tolower(*p);
p++;
if (c >= 'a' && c <= 'z') {
// we have a mark
c = c - 'a';
q = mark[(unsigned char) c];
if (q != NULL) { // is mark valid
*addr = count_lines(text, q);
}
}
}
#endif
#if ENABLE_FEATURE_VI_SEARCH
else if (*p == '/') { // a search pattern
q = strchrnul(p + 1, '/');
if (p + 1 != q) {
// save copy of new pattern
free(last_search_pattern);
last_search_pattern = xstrndup(p, q - p);
}
p = q;
if (*p == '/')
p++;
q = char_search(next_line(dot), last_search_pattern + 1,
(FORWARD << 1) | FULL);
if (q != NULL) {
*addr = count_lines(text, q);
}
}
#endif
else if (*p == '$') { // the last line in file
p++;
q = begin_line(end - 1);
*addr = count_lines(text, q);
} else if (isdigit(*p)) { // specific line number
sscanf(p, "%d%n", addr, &st);
p += st;
} else {
// unrecognized address - assume -1
*addr = -1;
}
return p;
}
static char *get_address(char *p, int *b, int *e) // get two colon addrs, if present
{
//----- get the address' i.e., 1,3 'a,'b -----
// get FIRST addr, if present
while (isblank(*p))
p++; // skip over leading spaces
if (*p == '%') { // alias for 1,$
p++;
*b = 1;
*e = count_lines(text, end-1);
goto ga0;
}
p = get_one_address(p, b);
while (isblank(*p))
p++;
if (*p == ',') { // is there a address separator
p++;
while (isblank(*p))
p++;
// get SECOND addr, if present
p = get_one_address(p, e);
}
ga0:
while (isblank(*p))
p++; // skip over trailing spaces
return p;
}
#if ENABLE_FEATURE_VI_SET && ENABLE_FEATURE_VI_SETOPTS
static void setops(const char *args, const char *opname, int flg_no,
const char *short_opname, int opt)
{
const char *a = args + flg_no;
int l = strlen(opname) - 1; // opname have + ' '
// maybe strncmp? we had tons of erroneous strncasecmp's...
if (strncasecmp(a, opname, l) == 0
|| strncasecmp(a, short_opname, 2) == 0
) {
if (flg_no)
vi_setops &= ~opt;
else
vi_setops |= opt;
}
}
#endif
#endif /* FEATURE_VI_COLON */
// buf must be no longer than MAX_INPUT_LEN!
static void colon(char *buf)
{
#if !ENABLE_FEATURE_VI_COLON
// Simple ":cmd" handler with minimal set of commands
char *p = buf;
int cnt;
if (*p == ':')
p++;
cnt = strlen(p);
if (cnt == 0)
return;
if (strncmp(p, "quit", cnt) == 0
|| strncmp(p, "q!", cnt) == 0
) {
if (modified_count && p[1] != '!') {
status_line_bold("No write since last change (:%s! overrides)", p);
} else {
editing = 0;
}
return;
}
if (strncmp(p, "write", cnt) == 0
|| strncmp(p, "wq", cnt) == 0
|| strncmp(p, "wn", cnt) == 0
|| (p[0] == 'x' && !p[1])
) {
if (modified_count != 0 || p[0] != 'x') {
cnt = file_write(current_filename, text, end - 1);
}
if (cnt < 0) {
if (cnt == -1)
status_line_bold("Write error: "STRERROR_FMT STRERROR_ERRNO);
} else {
modified_count = 0;
last_modified_count = -1;
status_line("'%s' %uL, %uC",
current_filename,
count_lines(text, end - 1), cnt
);
if (p[0] == 'x'
|| p[1] == 'q' || p[1] == 'n'
|| p[1] == 'Q' || p[1] == 'N'
) {
editing = 0;
}
}
return;
}
if (strncmp(p, "file", cnt) == 0) {
last_status_cksum = 0; // force status update
return;
}
if (sscanf(p, "%d", &cnt) > 0) {
dot = find_line(cnt);
dot_skip_over_ws();
return;
}
not_implemented(p);
#else
char c, *buf1, *q, *r;
char *fn, cmd[MAX_INPUT_LEN], args[MAX_INPUT_LEN];
int i, l, li, b, e;
int useforce;
# if ENABLE_FEATURE_VI_SEARCH || ENABLE_FEATURE_ALLOW_EXEC
char *orig_buf;
# endif
// :3154 // if (-e line 3154) goto it else stay put
// :4,33w! foo // write a portion of buffer to file "foo"
// :w // write all of buffer to current file
// :q // quit
// :q! // quit- dont care about modified file
// :'a,'z!sort -u // filter block through sort
// :'f // goto mark "f"
// :'fl // list literal the mark "f" line
// :.r bar // read file "bar" into buffer before dot
// :/123/,/abc/d // delete lines from "123" line to "abc" line
// :/xyz/ // goto the "xyz" line
// :s/find/replace/ // substitute pattern "find" with "replace"
// :!<cmd> // run <cmd> then return
//
if (!buf[0])
goto ret;
if (*buf == ':')
buf++; // move past the ':'
li = i = 0;
b = e = -1;
q = text; // assume 1,$ for the range
r = end - 1;
li = count_lines(text, end - 1);
fn = current_filename;
// look for optional address(es) :. :1 :1,9 :'q,'a :%
buf = get_address(buf, &b, &e);
# if ENABLE_FEATURE_VI_SEARCH || ENABLE_FEATURE_ALLOW_EXEC
// remember orig command line
orig_buf = buf;
# endif
// get the COMMAND into cmd[]
buf1 = cmd;
while (*buf != '\0') {
if (isspace(*buf))
break;
*buf1++ = *buf++;
}
*buf1 = '\0';
// get any ARGuments
while (isblank(*buf))
buf++;
strcpy(args, buf);
useforce = FALSE;
buf1 = last_char_is(cmd, '!');
if (buf1) {
useforce = TRUE;
*buf1 = '\0'; // get rid of !
}
if (b >= 0) {
// if there is only one addr, then the addr
// is the line number of the single line the
// user wants. So, reset the end
// pointer to point at end of the "b" line
q = find_line(b); // what line is #b
r = end_line(q);
li = 1;
}
if (e >= 0) {
// we were given two addrs. change the
// end pointer to the addr given by user.
r = find_line(e); // what line is #e
r = end_line(r);
li = e - b + 1;
}
// ------------ now look for the command ------------
i = strlen(cmd);
if (i == 0) { // :123CR goto line #123
if (b >= 0) {
dot = find_line(b); // what line is #b
dot_skip_over_ws();
}
}
# if ENABLE_FEATURE_ALLOW_EXEC
else if (cmd[0] == '!') { // run a cmd
int retcode;
// :!ls run the <cmd>
go_bottom_and_clear_to_eol();
cookmode();
retcode = system(orig_buf + 1); // run the cmd
if (retcode)
printf("\nshell returned %i\n\n", retcode);
rawmode();
Hit_Return(); // let user see results
}
# endif
else if (cmd[0] == '=' && !cmd[1]) { // where is the address
if (b < 0) { // no addr given- use defaults
b = e = count_lines(text, dot);
}
status_line("%d", b);
} else if (strncmp(cmd, "delete", i) == 0) { // delete lines
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume .,. for the range
r = end_line(dot);
}
dot = yank_delete(q, r, 1, YANKDEL, ALLOW_UNDO); // save, then delete lines
dot_skip_over_ws();
} else if (strncmp(cmd, "edit", i) == 0) { // Edit a file
int size;
// don't edit, if the current file has been modified
if (modified_count && !useforce) {
status_line_bold("No write since last change (:%s! overrides)", cmd);
goto ret;
}
if (args[0]) {
// the user supplied a file name
fn = args;
} else if (current_filename && current_filename[0]) {
// no user supplied name- use the current filename
// fn = current_filename; was set by default
} else {
// no user file name, no current name- punt
status_line_bold("No current filename");
goto ret;
}
size = init_text_buffer(fn);
# if ENABLE_FEATURE_VI_YANKMARK
if (Ureg >= 0 && Ureg < 28) {
free(reg[Ureg]); // free orig line reg- for 'U'
reg[Ureg] = NULL;
}
/*if (YDreg < 28) - always true*/ {
free(reg[YDreg]); // free default yank/delete register
reg[YDreg] = NULL;
}
# endif
// how many lines in text[]?
li = count_lines(text, end - 1);
status_line("'%s'%s"
IF_FEATURE_VI_READONLY("%s")
" %uL, %uC",
current_filename,
(size < 0 ? " [New file]" : ""),
IF_FEATURE_VI_READONLY(
((readonly_mode) ? " [Readonly]" : ""),
)
li, (int)(end - text)
);
} else if (strncmp(cmd, "file", i) == 0) { // what File is this
if (b != -1 || e != -1) {
status_line_bold("No address allowed on this command");
goto ret;
}
if (args[0]) {
// user wants a new filename
free(current_filename);
current_filename = xstrdup(args);
} else {
// user wants file status info
last_status_cksum = 0; // force status update
}
} else if (strncmp(cmd, "features", i) == 0) { // what features are available
// print out values of all features
go_bottom_and_clear_to_eol();
cookmode();
show_help();
rawmode();
Hit_Return();
} else if (strncmp(cmd, "list", i) == 0) { // literal print line
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume .,. for the range
r = end_line(dot);
}
go_bottom_and_clear_to_eol();
puts("\r");
for (; q <= r; q++) {
int c_is_no_print;
c = *q;
c_is_no_print = (c & 0x80) && !Isprint(c);
if (c_is_no_print) {
c = '.';
standout_start();
}
if (c == '\n') {
write1("$\r");
} else if (c < ' ' || c == 127) {
bb_putchar('^');
if (c == 127)
c = '?';
else
c += '@';
}
bb_putchar(c);
if (c_is_no_print)
standout_end();
}
Hit_Return();
} else if (strncmp(cmd, "quit", i) == 0 // quit
|| strncmp(cmd, "next", i) == 0 // edit next file
|| strncmp(cmd, "prev", i) == 0 // edit previous file
) {
int n;
if (useforce) {
if (*cmd == 'q') {
// force end of argv list
optind = cmdline_filecnt;
}
editing = 0;
goto ret;
}
// don't exit if the file been modified
if (modified_count) {
status_line_bold("No write since last change (:%s! overrides)", cmd);
goto ret;
}
// are there other file to edit
n = cmdline_filecnt - optind - 1;
if (*cmd == 'q' && n > 0) {
status_line_bold("%u more file(s) to edit", n);
goto ret;
}
if (*cmd == 'n' && n <= 0) {
status_line_bold("No more files to edit");
goto ret;
}
if (*cmd == 'p') {
// are there previous files to edit
if (optind < 1) {
status_line_bold("No previous files to edit");
goto ret;
}
optind -= 2;
}
editing = 0;
} else if (strncmp(cmd, "read", i) == 0) { // read file into text[]
int size;
fn = args;
if (!fn[0]) {
status_line_bold("No filename given");
goto ret;
}
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume "dot"
}
// read after current line- unless user said ":0r foo"
if (b != 0) {
q = next_line(q);
// read after last line
if (q == end-1)
++q;
}
{ // dance around potentially-reallocated text[]
uintptr_t ofs = q - text;
size = file_insert(fn, q, 0);
q = text + ofs;
}
if (size < 0)
goto ret; // nothing was inserted
// how many lines in text[]?
li = count_lines(q, q + size - 1);
status_line("'%s'"
IF_FEATURE_VI_READONLY("%s")
" %uL, %uC",
fn,
IF_FEATURE_VI_READONLY((readonly_mode ? " [Readonly]" : ""),)
li, size
);
if (size > 0) {
// if the insert is before "dot" then we need to update
if (q <= dot)
dot += size;
}
} else if (strncmp(cmd, "rewind", i) == 0) { // rewind cmd line args
if (modified_count && !useforce) {
status_line_bold("No write since last change (:%s! overrides)", cmd);
} else {
// reset the filenames to edit
optind = -1; // start from 0th file
editing = 0;
}
# if ENABLE_FEATURE_VI_SET
} else if (strncmp(cmd, "set", i) == 0) { // set or clear features
# if ENABLE_FEATURE_VI_SETOPTS
char *argp;
# endif
i = 0; // offset into args
// only blank is regarded as args delimiter. What about tab '\t'?
if (!args[0] || strcasecmp(args, "all") == 0) {
// print out values of all options
# if ENABLE_FEATURE_VI_SETOPTS
status_line_bold(
"%sautoindent "
"%sflash "
"%signorecase "
"%sshowmatch "
"tabstop=%u",
autoindent ? "" : "no",
err_method ? "" : "no",
ignorecase ? "" : "no",
showmatch ? "" : "no",
tabstop
);
# endif
goto ret;
}
# if ENABLE_FEATURE_VI_SETOPTS
argp = args;
while (*argp) {
if (strncmp(argp, "no", 2) == 0)
i = 2; // ":set noautoindent"
setops(argp, "autoindent ", i, "ai", VI_AUTOINDENT);
setops(argp, "flash " , i, "fl", VI_ERR_METHOD);
setops(argp, "ignorecase ", i, "ic", VI_IGNORECASE);
setops(argp, "showmatch " , i, "sm", VI_SHOWMATCH );
if (strncmp(argp + i, "tabstop=", 8) == 0) {
int t = 0;
sscanf(argp + i+8, "%u", &t);
if (t > 0 && t <= MAX_TABSTOP)
tabstop = t;
}
argp = skip_non_whitespace(argp);
argp = skip_whitespace(argp);
}
# endif /* FEATURE_VI_SETOPTS */
# endif /* FEATURE_VI_SET */
# if ENABLE_FEATURE_VI_SEARCH
} else if (cmd[0] == 's') { // substitute a pattern with a replacement pattern
char *F, *R, *flags;
size_t len_F, len_R;
int gflag; // global replace flag
# if ENABLE_FEATURE_VI_UNDO
int dont_chain_first_item = ALLOW_UNDO;
# endif
// F points to the "find" pattern
// R points to the "replace" pattern
// replace the cmd line delimiters "/" with NULs
c = orig_buf[1]; // what is the delimiter
F = orig_buf + 2; // start of "find"
R = strchr(F, c); // middle delimiter
if (!R)
goto colon_s_fail;
len_F = R - F;
*R++ = '\0'; // terminate "find"
flags = strchr(R, c);
if (!flags)
goto colon_s_fail;
len_R = flags - R;
*flags++ = '\0'; // terminate "replace"
gflag = *flags;
q = begin_line(q);
if (b < 0) { // maybe :s/foo/bar/
q = begin_line(dot); // start with cur line
b = count_lines(text, q); // cur line number
}
if (e < 0)
e = b; // maybe :.s/foo/bar/
for (i = b; i <= e; i++) { // so, :20,23 s \0 find \0 replace \0
char *ls = q; // orig line start
char *found;
vc4:
found = char_search(q, F, (FORWARD << 1) | LIMITED); // search cur line only for "find"
if (found) {
uintptr_t bias;
// we found the "find" pattern - delete it
// For undo support, the first item should not be chained
text_hole_delete(found, found + len_F - 1, dont_chain_first_item);
# if ENABLE_FEATURE_VI_UNDO
dont_chain_first_item = ALLOW_UNDO_CHAIN;
# endif
// insert the "replace" patern