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editline/editline.c

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/*
* Copyright (c) 1992, 1993 Simmule Turner and Rich Salz
* All rights reserved.
*
* This software is not subject to any license of the American Telephone
* and Telegraph Company or of the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on
* any computer system, and to alter it and redistribute it freely, subject
* to the following restrictions:
* 1. The authors are not responsible for the consequences of use of this
* software, no matter how awful, even if they arise from flaws in it.
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Since few users ever read sources,
* credits must appear in the documentation.
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software. Since few users
* ever read sources, credits must appear in the documentation.
* 4. This notice may not be removed or altered.
*/
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <sys/ioctl.h>
#include "editline.h"
/*
** Manifest constants.
*/
#define SCREEN_COLS 80
#define SCREEN_ROWS 24
#define EL_STDIN 0
#define EL_STDOUT 1
#define NO_ARG (-1)
#define DEL 127
#define SEPS "\"#$&'()*:;<=>?[\\]^`{|}~\n\t "
/*
** The type of case-changing to perform.
*/
typedef enum {
TOupper, TOlower, TOcapitalize
} el_case_t;
/*
** Key to command mapping.
*/
typedef struct {
int Key;
el_status_t (*Function)(void);
} el_keymap_t;
/*
** Command history structure.
*/
typedef struct {
int Size;
int Pos;
char **Lines;
} el_hist_t;
/* User definable callbacks. */
rl_getc_func_t *rl_getc_function = rl_getc;
rl_hook_func_t *rl_event_hook;
rl_vintfunc_t *rl_prep_term_function = rl_prep_terminal;
rl_voidfunc_t *rl_deprep_term_function = rl_deprep_terminal;
/*
** Globals.
*/
int rl_eof;
int rl_erase;
int rl_intr;
int rl_kill;
int rl_quit;
#ifdef CONFIG_SIGSTOP
int rl_susp;
#endif
int el_hist_size = 15;
static el_hist_t H = {
.Size = 0,
.Pos = 0,
.Lines = NULL,
};
static char NILSTR[] = "";
static const char *el_input = NILSTR;
static char *Yanked;
static char *Screen;
static char NEWLINE[]= CRLF;
static char CLEAR[]= "\ec";
static const char *el_term = "dumb";
static int Repeat;
static int old_point;
static int el_push_back;
static int el_pushed;
static int el_intr_pending;
static int el_infd = EL_STDIN;
static int el_outfd = EL_STDOUT;
static el_keymap_t Map[];
static el_keymap_t MetaMap[];
static size_t Length = 0;
static size_t ScreenCount;
static size_t ScreenSize;
static char *backspace = "\b";
static char *old_search = NULL;
static int tty_cols = SCREEN_COLS;
static int tty_rows = SCREEN_ROWS;
static int Searching = 0;
static const char *(*search_move)(void);
static const char *old_prompt = NULL;
static rl_vcpfunc_t *line_handler = NULL;
static char *line_up = "\x1b[A";
static char *line_down = "\x1b[B";
int prompt_len = 0;
int el_no_echo = 0; /* e.g., under Emacs */
int el_no_hist = 0;
int rl_point;
int rl_mark;
int rl_end;
int rl_meta_chars = 0; /* Display 8-bit chars as the actual char(0) or as `M-x'(1)? */
int rl_inhibit_complete = 0;
char *rl_line_buffer = NULL;
const char *rl_prompt = NULL;
const char *rl_readline_name = NULL; /* Set by calling program, for conditional parsing of ~/.inputrc - Not supported yet! */
FILE *rl_instream = NULL; /* The stdio stream from which input is read. Defaults to stdin if NULL */
FILE *rl_outstream = NULL; /* The stdio stream to which output is flushed. Defaults to stdout if NULL */
/* Declarations. */
static char *editinput(int complete);
#ifdef CONFIG_USE_TERMCAP
extern char *tgetstr(const char *, char **);
extern int tgetent(char *, const char *);
extern int tgetnum(const char *);
#endif
/*
** Misc. local helper functions.
*/
static int is_alpha_num(unsigned char c)
{
if (isalnum(c))
return 1;
if (ISMETA(c))
return 1;
if (ISCTL(c))
return 1;
return 0;
}
/*
** TTY input/output functions.
*/
static void tty_flush(void)
{
ssize_t res;
if (!ScreenCount)
return;
if (!el_no_echo) {
res = write(el_outfd, Screen, ScreenCount);
if (res > 0)
ScreenCount = 0;
}
}
static void tty_put(const char c)
{
if (el_no_echo)
return;
Screen[ScreenCount] = c;
if (++ScreenCount >= ScreenSize) {
char *ptr;
ScreenSize += SCREEN_INC;
ptr = realloc(Screen, sizeof(char) * ScreenSize);
if (ptr)
Screen = ptr;
}
}
static void tty_puts(const char *p)
{
while (*p)
tty_put(*p++);
}
static void tty_show(unsigned char c)
{
if (c == DEL) {
tty_put('^');
tty_put('?');
} else if (ISCTL(c)) {
tty_put('^');
tty_put(UNCTL(c));
} else if (rl_meta_chars && ISMETA(c)) {
tty_put('M');
tty_put('-');
tty_put(UNMETA(c));
} else {
tty_put(c);
}
}
static void tty_string(char *p)
{
int i = rl_point + prompt_len + 1;
while (*p) {
tty_show(*p++);
if ((i++) % tty_cols == 0) {
tty_put(' ');
tty_put('\b');
}
}
}
static void tty_push(int c)
{
el_pushed = 1;
el_push_back = c;
}
int rl_getc(void)
{
int r;
char c;
do {
r = read(el_infd, &c, 1);
} while (r == -1 && errno == EINTR);
return r == 1 ? c : EOF;
}
static int tty_get(void)
{
tty_flush();
if (el_pushed) {
el_pushed = 0;
return el_push_back;
}
if (*el_input)
return *el_input++;
return rl_getc_function();
}
#define tty_back() tty_puts(backspace)
static void tty_backn(int n)
{
while (--n >= 0)
tty_back();
}
static void tty_forwardn(int n)
{
char buf[12];
snprintf(buf, sizeof(buf), "\x1b[%dC", n);
tty_puts(buf);
}
static void tty_info(void)
{
rl_reset_terminal(NULL);
}
/*
** Glue routines to rl_ttyset()
*/
void rl_prep_terminal(int meta_flag)
{
rl_meta_chars = !meta_flag;
rl_ttyset(0);
}
void rl_deprep_terminal(void)
{
rl_ttyset(1);
}
/*
** Print an array of words in columns.
*/
void el_print_columns(int ac, char **av)
{
char *p;
int i;
int j;
int k;
int len;
int skip;
int longest;
int cols;
int colwidth;
/* Find longest name, determine column count from that. */
for (longest = 0, i = 0; i < ac; i++) {
if ((j = strlen((char *)av[i])) > longest)
longest = j;
}
colwidth = longest + 3;
if (colwidth > tty_cols)
colwidth = tty_cols;
cols = tty_cols / colwidth;
tty_puts(NEWLINE);
for (skip = ac / cols + 1, i = 0; i < skip; i++) {
for (j = i; j < ac; j += skip) {
for (p = av[j], len = strlen((char *)p), k = len; --k >= 0; p++)
tty_put(*p);
if (j + skip < ac) {
while (++len < colwidth)
tty_put(' ');
}
}
tty_puts(NEWLINE);
}
}
static void reposition(int key)
{
int len_with_prompt = prompt_len + rl_end;
int n = len_with_prompt / tty_cols; /* determine the number of lines */
int i = 0;
tty_put('\r');
if (n > 0) {
int line;
/* determine num of current line */
if (key == CTL('A') || key == CTL('E') || key == rl_kill)
line = (prompt_len + old_point) / tty_cols;
else
line = len_with_prompt / tty_cols;
/* move to end of line(s) */
if (key == CTL('E')) {
int k;
for (k = line; k < n; k++)
tty_puts(line_down);
/* determine reminder of last line and redraw only it */
i = rl_point - (len_with_prompt % tty_cols);
} else {
int k;
/* CTRL-A, CTRL-U, insert (end, middle), remove (end, middle) */
for (k = line; k > 0; k--)
tty_puts(line_up); /* redraw characters until changed data */
tty_puts(rl_prompt);
}
} else if (n == 0) {
tty_puts(rl_prompt);
}
for (; i < rl_point; i++) {
tty_show(rl_line_buffer[i]);
/* move to the next line */
if ((i + prompt_len + 1) % tty_cols == 0)
tty_put('\n');
}
}
static void left(el_status_t Change)
{
if (rl_point) {
if ((rl_point + prompt_len) % tty_cols == 0) {
tty_puts(line_up);
tty_forwardn(tty_cols);
} else {
tty_back();
}
if (ISMETA(rl_line_buffer[rl_point - 1])) {
if (rl_meta_chars) {
tty_back();
tty_back();
}
} else if (ISCTL(rl_line_buffer[rl_point - 1])) {
tty_back();
}
}
if (Change == CSmove)
rl_point--;
}
static void right(el_status_t Change)
{
if ((rl_point + prompt_len + 1) % tty_cols == 0)
tty_put('\n');
else
tty_show(rl_line_buffer[rl_point]);
if (Change == CSmove)
rl_point++;
}
el_status_t el_ring_bell(void)
{
tty_put('\07');
tty_flush();
return CSstay;
}
static el_status_t do_macro(int c)
{
char name[4];
name[0] = '_';
name[1] = c;
name[2] = '_';
name[3] = '\0';
if ((el_input = (char *)getenv((char *)name)) == NULL) {
el_input = NILSTR;
return el_ring_bell();
}
return CSstay;
}
/* Skip forward to start of next word. If @move is set we also move the cursor. */
static el_status_t do_forward(el_status_t move)
{
int i;
char *p;
i = 0;
do {
p = &rl_line_buffer[rl_point];
/* Skip leading whitespace, like FSF Readline */
for ( ; rl_point < rl_end && (p[0] == ' ' || !is_alpha_num(p[0])); rl_point++, p++) {
if (move == CSmove)
right(CSstay);
}
/* Skip to end of word, if inside a word. */
for (; rl_point < rl_end && is_alpha_num(p[0]); rl_point++, p++) {
if (move == CSmove)
right(CSstay);
}
/* Skip to next word, or skip leading white space if outside a word. */
for ( ; rl_point < rl_end && (p[0] == ' ' || !is_alpha_num(p[0])); rl_point++, p++) {
if (move == CSmove)
right(CSstay);
}
if (rl_point == rl_end)
break;
} while (++i < Repeat);
return CSstay;
}
static el_status_t do_case(el_case_t type)
{
int i;
int end;
int count;
char *p;
do_forward(CSstay);
if (old_point != rl_point) {
if ((count = rl_point - old_point) < 0)
count = -count;
rl_point = old_point;
if ((end = rl_point + count) > rl_end)
end = rl_end;
for (i = rl_point, p = &rl_line_buffer[i]; rl_point < end; p++) {
if ((type == TOupper) || (type == TOcapitalize && rl_point == i)) {
if (islower(*p))
*p = toupper(*p);
} else if (isupper(*p)) {
*p = tolower(*p);
}
right(CSmove);
}
}
return CSstay;
}
static el_status_t case_down_word(void)
{
return do_case(TOlower);
}
static el_status_t case_up_word(void)
{
return do_case(TOupper);
}
static el_status_t case_cap_word(void)
{
return do_case(TOcapitalize);
}
static void ceol(void)
{
int extras = 0;
int i;
char *p;
while (rl_point < 0) {
tty_put(' ');
rl_point++;
}
for (i = rl_point, p = &rl_line_buffer[i]; i <= rl_end; i++, p++) {
if ((i + prompt_len + 1) % tty_cols == 0){
tty_put(' ');
tty_put('\n');
}
else
tty_put(' ');
if (ISMETA(*p)) {
if (rl_meta_chars) {
tty_put(' ');
tty_put(' ');
extras += 2;
}
} else if (ISCTL(*p)) {
tty_put(' ');
extras++;
}
}
for (i += extras; i > rl_point; i--) {
if ((i + prompt_len) % tty_cols == 0) {
tty_puts(line_up);
tty_forwardn(tty_cols);
} else {
tty_back();
}
}
}
static void clear_line(void)
{
int n = (rl_point + prompt_len) / tty_cols;
rl_point = -(int)strlen(rl_prompt);
if (n > 0) {
for(int k = 0; k < n; k++)
tty_puts(line_up);
tty_put('\r');
}
else {
tty_put('\r');
}
ceol();
rl_point = 0;
rl_end = 0;
rl_line_buffer[0] = '\0';
}
static el_status_t insert_string(const char *p)
{
size_t len;
int i;
char *line;
char *q;
len = strlen(p);
if (rl_end + len >= Length) {
line = malloc(sizeof(char) * (Length + len + MEM_INC));
if (!line)
return CSstay;
if (Length) {
memcpy(line, rl_line_buffer, Length);
free(rl_line_buffer);
}
rl_line_buffer = line;
Length += len + MEM_INC;
}
for (q = &rl_line_buffer[rl_point], i = rl_end - rl_point; --i >= 0; )
q[len + i] = q[i];
memcpy(&rl_line_buffer[rl_point], p, len);
rl_end += len;
rl_line_buffer[rl_end] = '\0';
tty_string(&rl_line_buffer[rl_point]);
rl_point += len;
return rl_point == rl_end ? CSstay : CSmove;
}
int rl_insert_text(const char *text)
{
int mark = rl_point;
insert_string(text);
ceol();
return rl_point - mark;
}
static el_status_t redisplay(int cls)
{
if (cls)
tty_puts(CLEAR);
else
tty_puts("\r\e[K");
tty_puts(rl_prompt);
rl_point = 0;
tty_string(rl_line_buffer);
rl_point = rl_end;
return CSmove;
}
static el_status_t refresh(void)
{
return redisplay(1);
}
int rl_refresh_line(int ignore1 __attribute__((unused)), int ignore2 __attribute__((unused)))
{
redisplay(0);
return 0;
}
static el_status_t toggle_meta_mode(void)
{
rl_meta_chars = ! rl_meta_chars;
return redisplay(0);
}
const char *el_next_hist(void)
{
return H.Pos >= H.Size - 1 ? NULL : H.Lines[++H.Pos];
}
const char *el_prev_hist(void)
{
return H.Pos == 0 ? NULL : H.Lines[--H.Pos];
}
static el_status_t do_insert_hist(const char *p)
{
if (p == NULL)
return el_ring_bell();
clear_line();
rl_point = 0;
reposition(EOF);
rl_end = 0;
return insert_string(p);
}
static el_status_t do_hist(const char *(*move)(void))
{
const char *p;
int i = 0;
do {
if ((p = move()) == NULL)
return el_ring_bell();
} while (++i < Repeat);
return do_insert_hist(p);
}
static el_status_t h_next(void)
{
if (el_no_hist)
return CSstay;
return do_hist(el_next_hist);
}
static el_status_t h_prev(void)
{
if (el_no_hist)
return CSstay;
return do_hist(el_prev_hist);
}
static el_status_t h_first(void)
{
return do_insert_hist(H.Lines[H.Pos = 0]);
}
static el_status_t h_last(void)
{
return do_insert_hist(H.Lines[H.Pos = H.Size - 1]);
}
/*
** Return zero if pat appears as a substring in text.
*/
static int substrcmp(const char *text, const char *pat, size_t len)
{
char c;
if ((c = *pat) == '\0')
return *text == '\0';
for ( ; *text; text++) {
if (*text == c && strncmp(text, pat, len) == 0)
return 0;
}
return 1;
}
static const char *search_hist(const char *search, const char *(*move)(void))
{
int len;
int pos;
int (*match)(const char *s1, const char *s2, size_t n);
const char *pat;
/* Save or get remembered search pattern. */
if (search && *search) {
if (old_search)
free(old_search);
old_search = strdup(search);
} else {
if (old_search == NULL || *old_search == '\0')
return NULL;
search = old_search;
}
/* Set up pattern-finder. */
if (*search == '^') {
match = strncmp;
pat = search + 1;
} else {
match = substrcmp;
pat = search;
}
len = strlen(pat);
pos = H.Pos; /* Save H.Pos */
while (move()) {
if (match(H.Lines[H.Pos], pat, len) == 0)
return H.Lines[H.Pos];
}
H.Pos = pos; /* Restore H.Pos */
return NULL;
}
static el_status_t h_search_end(const char *p)
{
rl_prompt = old_prompt;
Searching = 0;
if (el_intr_pending > 0) {
el_intr_pending = 0;
clear_line();
return redisplay(0);
}
p = search_hist(p, search_move);
if (p == NULL) {
el_ring_bell();
clear_line();
return redisplay(0);
}
return do_insert_hist(p);
}
static el_status_t h_search(void)
{
if (Searching)
return el_ring_bell();
Searching = 1;
clear_line();
old_prompt = rl_prompt;
rl_prompt = "Search: ";
tty_puts(rl_prompt);
search_move = Repeat == NO_ARG ? el_prev_hist : el_next_hist;
if (line_handler) {
editinput(0);
return CSstay;
}
return h_search_end(editinput(1));
}
static el_status_t fd_char(void)
{
int i = 0;
do {
if (rl_point >= rl_end)
break;
right(CSmove);
} while (++i < Repeat);
return CSstay;
}
static void save_yank(int begin, int i)
{
if (Yanked) {
free(Yanked);
Yanked = NULL;
}
if (i < 1)
return;
Yanked = malloc(sizeof(char) * (i + 1));
if (Yanked) {
memcpy(Yanked, &rl_line_buffer[begin], i);
Yanked[i] = '\0';
}
}
static el_status_t delete_string(int count)
{
int i;
char *p;
if (count <= 0 || rl_end == rl_point)
return el_ring_bell();
if (count == 1 && rl_point == rl_end - 1) {
/* Optimize common case of delete at end of line. */
rl_end--;
p = &rl_line_buffer[rl_point];
i = 1;
tty_put(' ');
if (ISCTL(*p)) {
i = 2;
tty_put(' ');
} else if (rl_meta_chars && ISMETA(*p)) {
i = 3;
tty_put(' ');
tty_put(' ');
}
tty_backn(i);
*p = '\0';
return CSmove;
}
if (rl_point + count > rl_end && (count = rl_end - rl_point) <= 0)
return CSstay;
if (count > 1)
save_yank(rl_point, count);
for (p = &rl_line_buffer[rl_point], i = rl_end - (rl_point + count) + 1; --i >= 0; p++)
p[0] = p[count];
ceol();
rl_end -= count;
tty_string(&rl_line_buffer[rl_point]);
return CSmove;
}
static el_status_t bk_char(void)
{
int i = 0;
do {
if (rl_point == 0)
break;
left(CSmove);
} while (++i < Repeat);
return CSstay;
}
static el_status_t bk_del_char(void)
{
int i = 0;
do {
if (rl_point == 0)
break;
left(CSmove);
} while (++i < Repeat);
return delete_string(i);
}
static el_status_t kill_line(void)
{
int i;
if (Repeat != NO_ARG) {
if (Repeat < rl_point) {
i = rl_point;
rl_point = Repeat;
reposition(EOF);
delete_string(i - rl_point);
} else if (Repeat > rl_point) {
right(CSmove);
delete_string(Repeat - rl_point - 1);
}
return CSmove;
}
save_yank(rl_point, rl_end - rl_point);
rl_line_buffer[rl_point] = '\0';
ceol();
rl_end = rl_point;
return CSstay;
}
static el_status_t insert_char(int c)
{
el_status_t s;
char buff[2];
char *p;
char *q;
int i;
if (Repeat == NO_ARG || Repeat < 2) {
buff[0] = c;
buff[1] = '\0';
return insert_string(buff);
}
p = malloc(sizeof(char) * (Repeat + 1));
if (!p)
return CSstay;
for (i = Repeat, q = p; --i >= 0; )
*q++ = c;
*q = '\0';
Repeat = 0;
s = insert_string(p);
free(p);
return s;
}
static el_status_t beg_line(void)
{
if (rl_point) {
rl_point = 0;
return CSmove;
}
return CSstay;
}
static el_status_t end_line(void)
{
if (rl_point != rl_end) {
rl_point = rl_end;
return CSmove;
}
return CSstay;
}
static el_status_t del_char(void)
{
return delete_string(Repeat == NO_ARG ? CSeof : Repeat);
}
el_status_t el_del_char(void)
{
return del_char();
}
static el_status_t fd_word(void)
{
return do_forward(CSmove);
}
static el_status_t bk_word(void)
{
int i;
char *p;
i = 0;
do {
for (p = &rl_line_buffer[rl_point]; p > rl_line_buffer && !is_alpha_num(p[-1]); p--)
left(CSmove);
for (; p > rl_line_buffer && !isblank(p[-1]) && is_alpha_num(p[-1]); p--)
left(CSmove);
if (rl_point == 0)
break;
} while (++i < Repeat);
return CSstay;
}
static el_status_t meta(void)
{
int c;
el_keymap_t *kp;
if ((c = tty_get()) == EOF)
return CSeof;
#ifdef CONFIG_ANSI_ARROWS
/* Also include VT-100 arrows. */
if (c == '[' || c == 'O') {
switch (tty_get()) {
case EOF: return CSeof;
case '1':
{
char seq[4] = { 0 };
for (c = 0; c < 3; c++)
seq[c] = tty_get();
if (!strncmp(seq, ";5C", 3))
return fd_word(); /* Ctrl+Right */
if (!strncmp(seq, ";5D", 3))
return bk_word(); /* Ctrl+Left */
break;
}
case '2': tty_get(); return CSstay; /* Insert */
case '3': tty_get(); return del_char(); /* Delete */
case '5': tty_get(); return CSstay; /* PgUp */
case '6': tty_get(); return CSstay; /* PgDn */
case 'A': return h_prev(); /* Up */
case 'B': return h_next(); /* Down */
case 'C': return fd_char(); /* Left */
case 'D': return bk_char(); /* Right */
case 'F': return end_line(); /* End */
case 'H': return beg_line(); /* Home */
default: /* Fall through */
break;
}
return el_ring_bell();
}
#endif /* CONFIG_ANSI_ARROWS */
if (isdigit(c)) {
for (Repeat = c - '0'; (c = tty_get()) != EOF && isdigit(c); )
Repeat = Repeat * 10 + c - '0';
tty_push(c);
return CSstay;
}
if (isupper(c))
return do_macro(c);
for (kp = MetaMap; kp->Function; kp++) {
if (kp->Key == c)
return kp->Function();
}
return el_ring_bell();
}
static el_status_t emacs(int c)
{
el_status_t s;
el_keymap_t *kp;
/* Save point before interpreting input character 'c'. */
old_point = rl_point;
if (rl_meta_chars && ISMETA(c)) {
tty_push(UNMETA(c));
return meta();
}
for (kp = Map; kp->Function; kp++) {
if (kp->Key == c)
break;
}
if (kp->Function) {
s = kp->Function();
if (s == CSdispatch) /* If Function is inhibited. */
s = insert_char(c);
} else {
s = insert_char(c);
}
if (!el_pushed) {
/* No pushback means no repeat count; hacky, but true. */
Repeat = NO_ARG;
}
return s;
}
static el_status_t tty_special(int c)
{
#ifdef CONFIG_SIGINT
if (c == rl_intr) {
el_intr_pending = SIGINT;
return CSsignal;
}
#endif
if (c == rl_quit) {
el_intr_pending = SIGQUIT;
return CSeof;
}
#ifdef CONFIG_SIGSTOP
if (c == rl_susp) {
el_intr_pending = SIGTSTP;
return CSsignal;
}
#endif
if (rl_meta_chars && ISMETA(c))
return CSdispatch;
if (c == rl_erase || c == DEL)
return bk_del_char();
if (c == rl_kill) {
if (rl_point != 0) {
old_point = rl_point;
rl_point = 0;
reposition(c);
}
Repeat = NO_ARG;
return kill_line();
}
#ifdef CONFIG_EOF
if (c == rl_eof && rl_point == 0 && rl_end == 0)
return CSeof;
#endif
return CSdispatch;
}
static char *editinput(int complete)
{
int c;
do {
c = tty_get();
if (c == EOF)
break;
switch (tty_special(c)) {
case CSdone:
return rl_line_buffer;
case CSeof:
return NULL;
case CSsignal:
return (char *)"";
case CSmove:
reposition(c);
break;
case CSdispatch:
switch (emacs(c)) {
case CSdone:
return rl_line_buffer;
case CSeof:
return NULL;
case CSsignal:
return (char *)"";
case CSmove:
reposition(c);
break;
case CSdispatch:
case CSstay:
break;
}
break;
case CSstay:
break;
}
} while (complete);
return NULL;
}
static void hist_alloc(void)
{
if (!H.Lines)
H.Lines = calloc(el_hist_size, sizeof(char *));
}
static void hist_add(const char *p)
{
int i;
char *s;
#ifdef CONFIG_UNIQUE_HISTORY
if (H.Size && strcmp(p, H.Lines[H.Size - 1]) == 0)
return;
#endif
s = strdup(p);
if (s == NULL)
return;
if (H.Size < el_hist_size) {
H.Lines[H.Size++] = s;
} else {
free(H.Lines[0]);
for (i = 0; i < el_hist_size - 1; i++)
H.Lines[i] = H.Lines[i + 1];
H.Lines[i] = s;
}
H.Pos = H.Size - 1;
}
static char *read_redirected(void)
{
int size = MEM_INC;
char *p;
char *line;
char *end;
p = line = malloc(sizeof(char) * size);
if (!p)
return NULL;
end = p + size;
while (1) {
if (p == end) {
int oldpos = end - line;
size += MEM_INC;
p = realloc(line, sizeof(char) * size);
if (!p) {
free(line);
return NULL;
}
line = p;
end = p + size;
p += oldpos; /* Continue where we left off... */
}
if (read(el_infd, p, 1) <= 0) {
/* Ignore "incomplete" lines at EOF, just like we do for a tty. */
free(line);
return NULL;
}
if (*p == '\n')
break;
p++;
}
*p = '\0';
return line;
}
/* For compatibility with FSF readline. */
void rl_reset_terminal(const char *terminal_name)
{
#ifdef CONFIG_USE_TERMCAP
char buf[1024];
char *bp;
#endif
#ifdef TIOCGWINSZ
struct winsize W;
#endif
if (terminal_name) {
el_term = terminal_name;
} else if ((el_term = getenv("TERM")) == NULL) {
el_term = "dumb";
}
/* Initialize to faulty values to trigger fallback if nothing else works. */
tty_cols = tty_rows = -1;
#ifdef CONFIG_USE_TERMCAP
bp = buf;
if (-1 != tgetent(buf, el_term)) {
if ((backspace = tgetstr("le", &bp)) != NULL)
backspace = strdup(backspace);
tty_cols = tgetnum("co");
tty_rows = tgetnum("li");
}
/* Make sure to check width & rows and fallback to TIOCGWINSZ if available. */
#endif
if (tty_cols <= 0 || tty_rows <= 0) {
#ifdef TIOCGWINSZ
if (ioctl(el_outfd, TIOCGWINSZ, &W) >= 0 && W.ws_col > 0 && W.ws_row > 0) {
tty_cols = (int)W.ws_col;
tty_rows = (int)W.ws_row;
return;
}
#endif
tty_cols = SCREEN_COLS;
tty_rows = SCREEN_ROWS;
}
}
void rl_initialize(void)
{
if (!rl_prompt)
rl_prompt = "? ";
hist_alloc();
/* Setup I/O descriptors */
if (!rl_instream) el_infd = EL_STDIN;
else el_infd = fileno(rl_instream);
if (el_infd < 0) el_infd = EL_STDIN;
if (!rl_outstream) el_outfd = EL_STDOUT;
else el_outfd = fileno(rl_outstream);
if (el_outfd < 0) el_outfd = EL_STDOUT;
}
void rl_uninitialize(void)
{
int i;
/* Uninitialize the history */
if (H.Lines) {
for (i = 0; i < el_hist_size; i++) {
if (H.Lines[i])
free(H.Lines[i]);
H.Lines[i] = NULL;
}
free(H.Lines);
H.Lines = NULL;
}
H.Size = 0;
H.Pos = 0;
if (old_search)
free(old_search);
old_search = NULL;
/* Uninitialize the line buffer */
if (rl_line_buffer)
free(rl_line_buffer);
rl_line_buffer = NULL;
Length = 0;
}
static const char *rl_saved_prompt = NULL;
void rl_save_prompt(void)
{
rl_saved_prompt = rl_prompt;
}
void rl_restore_prompt(void)
{
if (rl_saved_prompt)
rl_prompt = rl_saved_prompt;
}
void rl_set_prompt(const char *prompt)
{
rl_prompt = prompt;
}
void rl_clear_message(void)
{
/* Nothing to do atm. */
}
void rl_forced_update_display()
{
redisplay(0);
tty_flush();
}
static int el_prep(const char *prompt)
{
rl_initialize();
if (!rl_line_buffer) {
Length = MEM_INC;
rl_line_buffer = malloc(sizeof(char) * Length);
if (!rl_line_buffer)
return -1;
}
tty_info();
rl_prep_term_function(!rl_meta_chars);
hist_add(NILSTR);
ScreenSize = SCREEN_INC;
Screen = malloc(sizeof(char) * ScreenSize);
if (!Screen)
return -1;
rl_prompt = prompt ? prompt : NILSTR;
prompt_len = strlen(rl_prompt);
if (el_no_echo) {
int old = el_no_echo;
el_no_echo = 0;
tty_puts(rl_prompt);
tty_flush();
el_no_echo = old;
} else {
tty_puts(rl_prompt);
}
Repeat = NO_ARG;
old_point = rl_point = rl_mark = rl_end = 0;
rl_line_buffer[0] = '\0';
el_intr_pending = -1;
return 0;
}
static char *el_deprep(char *line)
{
if (line) {
line = strdup(line);
tty_puts(NEWLINE);
tty_flush();
}
rl_deprep_term_function();
if (Screen) {
free(Screen);
Screen = NULL;
}
free(H.Lines[--H.Size]);
H.Lines[H.Size] = NULL;
/* Add to history, unless no-echo or no-history mode ... */
if (!el_no_echo && !el_no_hist) {
if (line != NULL && *line != '\0')
hist_add(line);
}
if (el_intr_pending > 0) {
int signo = el_intr_pending;
el_intr_pending = 0;
kill(getpid(), signo);
}
return line;
}
void rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *lhandler)
{
if (!lhandler)
return;
line_handler = lhandler;
/*
* Any error from el_prep() is handled by the lhandler callbck as
* soon as the user calls rl_callback_read_char().
*/
el_prep(prompt);
tty_flush();
}
/*
* Reads one character at a time, when a complete line has been received
* the lhandler from rl_callback_handler_install() is called with the
* line as argument.
*
* If the callback returns the terminal is prepped for reading a new
* line.
*
* If any error occurs, either in the _install() phase, or while reading
* one character, this function restores the terminal and calls lhandler
* with a NULL argument.
*/
void rl_callback_read_char(void)
{
char *line;
if (!line_handler) {
errno = EINVAL;
return;
}
/*
* Check if rl_callback_handler_install() failed
* This is the only point where we can tell user
*/
if (!Screen || !rl_line_buffer) {
errno = ENOMEM;
line_handler(el_deprep(NULL));
return;
}
line = editinput(0);
if (line) {
char *l;
if (Searching) {
h_search_end(line);
tty_flush();
return;
}
l = el_deprep(line);
line_handler(l);
if (el_prep(rl_prompt))
line_handler(NULL);
}
tty_flush();
}
void rl_callback_handler_remove(void)
{
if (!line_handler)
return;
el_deprep(NULL);
line_handler = NULL;
}
char *readline(const char *prompt)
{
/* Unless called by the user already. */
rl_initialize();
if (!isatty(el_infd)) {
tty_flush();
return read_redirected();
}
if (el_prep(prompt))
return NULL;
return el_deprep(editinput(1));
}
/*
* Even though readline() itself adds history automatically, the user
* can also add lines. This is for compatibility with GNU Readline.
*/
void add_history(const char *p)
{
if (p == NULL || *p == '\0')
return;
hist_add(p);
}
int read_history(const char *filename)
{
FILE *fp;
char buf[SCREEN_INC];
hist_alloc();
fp = fopen(filename, "r");
if (!fp)
return EOF;
H.Size = 0;
while (H.Size < el_hist_size) {
if (!fgets(buf, SCREEN_INC, fp))
break;
buf[strlen(buf) - 1] = 0; /* Remove '\n' */
add_history(buf);
}
return fclose(fp);
}
int write_history(const char *filename)
{
FILE *fp;
int i = 0;
hist_alloc();
fp = fopen(filename, "w");
if (!fp)
return EOF;
while (i < H.Size)
fprintf(fp, "%s\n", H.Lines[i++]);
return fclose(fp);
}
/*
** Move back to the beginning of the current word and return an
** allocated copy of it.
*/
char *el_find_word(void)
{
char *p, *q;
char *word;
size_t len;
p = &rl_line_buffer[rl_point];
while (p > rl_line_buffer) {
p--;
if (p > rl_line_buffer && p[-1] == '\\') {
p--;
} else {
if (strchr(SEPS, (char) *p) != NULL) {
p++;
break;
}
}
}
len = rl_point - (p - rl_line_buffer) + 1;
word = malloc(sizeof(char) * len);
if (!word)
return NULL;
q = word;
while (p < &rl_line_buffer[rl_point]) {
if (*p == '\\') {
if (++p == &rl_line_buffer[rl_point])
break;
}
*q++ = *p++;
}
*q = '\0';
return word;
}
static el_status_t c_possible(void)
{
char **av;
char *word;
int ac;
word = el_find_word();
ac = rl_list_possib(word, &av);
if (word)
free(word);
if (ac) {
el_print_columns(ac, av);
while (--ac >= 0)
free(av[ac]);
free(av);
return CSmove;
}
return el_ring_bell();
}
static el_status_t c_complete(void)
{
char *p, *q;
char *word, *string;
size_t len;
int unique;
el_status_t s = CSdone;
if (rl_inhibit_complete)
return CSdispatch;
word = el_find_word();
p = rl_complete(word, &unique);
if (word)
free(word);
if (p) {
len = strlen(p);
word = p;
string = q = malloc(sizeof(char) * (2 * len + 1));
if (!string) {
free(word);
return CSstay;
}
while (*p) {
if ((*p < ' ' || strchr(SEPS, *p) != NULL)
&& (!unique || p[1] != 0)) {
*q++ = '\\';
}
*q++ = *p++;
}
*q = '\0';
free(word);
if (len > 0) {
s = insert_string(string);
#ifdef CONFIG_TERMINAL_BELL
if (!unique)
el_ring_bell();
#endif
}
free(string);
if (len > 0)
return s;
}
return c_possible();
}
static el_status_t accept_line(void)
{
rl_line_buffer[rl_end] = '\0';
return CSdone;
}
#ifdef SYSTEM_IS_WIN32
static el_status_t end_of_input(void)
{
rl_line_buffer[rl_end] = '\0';
return CSeof;
}
#endif
static el_status_t transpose(void)
{
char c;
if (rl_point) {
if (rl_point == rl_end)
left(CSmove);
c = rl_line_buffer[rl_point - 1];
left(CSstay);
rl_line_buffer[rl_point - 1] = rl_line_buffer[rl_point];
tty_show(rl_line_buffer[rl_point - 1]);
rl_line_buffer[rl_point++] = c;
tty_show(c);
}
return CSstay;
}
static el_status_t quote(void)
{
int c;
return (c = tty_get()) == EOF ? CSeof : insert_char((int)c);
}
static el_status_t mk_set(void)
{
rl_mark = rl_point;
return CSstay;
}
static el_status_t exchange(void)
{
int c;
if ((c = tty_get()) != CTL('X'))
return c == EOF ? CSeof : el_ring_bell();
if ((c = rl_mark) <= rl_end) {
rl_mark = rl_point;
rl_point = c;
return CSmove;
}
return CSstay;
}
static el_status_t yank(void)
{
if (Yanked && *Yanked)
return insert_string(Yanked);
return CSstay;
}
static el_status_t copy_region(void)
{
if (rl_mark > rl_end)
return el_ring_bell();
if (rl_point > rl_mark)
save_yank(rl_mark, rl_point - rl_mark);
else
save_yank(rl_point, rl_mark - rl_point);
return CSstay;
}
static el_status_t move_to_char(void)
{
int i, c;
char *p;
if ((c = tty_get()) == EOF)
return CSeof;
for (i = rl_point + 1, p = &rl_line_buffer[i]; i < rl_end; i++, p++) {
if (*p == c) {
rl_point = i;
return CSmove;
}
}
return CSstay;
}
static el_status_t fd_kill_word(void)
{
int i;
do_forward(CSstay);
if (old_point != rl_point) {
i = rl_point - old_point - 1;
rl_point = old_point;
return delete_string(i);
}
return CSstay;
}
static el_status_t bk_kill_word(void)
{
bk_word();
if (old_point != rl_point)
return delete_string(old_point - rl_point);
return CSstay;
}
static int argify(char *line, char ***avp)
{
char *c;
char **p;
char **arg;
int ac;
int i;
i = MEM_INC;
*avp = p = malloc(sizeof(char *) * i);
if (!p)
return 0;
for (c = line; isspace(*c); c++)
continue;
if (*c == '\n' || *c == '\0')
return 0;
for (ac = 0, p[ac++] = c; *c && *c != '\n'; ) {
if (!isspace(*c)) {
c++;
continue;
}
*c++ = '\0';
if (*c && *c != '\n') {
if (ac + 1 == i) {
arg = malloc(sizeof(char *) * (i + MEM_INC));
if (!arg) {
p[ac] = NULL;
return ac;
}
memcpy(arg, p, i * sizeof(char *));
i += MEM_INC;
free(p);
*avp = p = arg;
}
p[ac++] = c;
}
}
*c = '\0';
p[ac] = NULL;
return ac;
}
static el_status_t last_argument(void)
{
char **av = NULL;
char *p;
el_status_t s;
int ac;
if (H.Size == 1 || (p = (char *)H.Lines[H.Size - 2]) == NULL)
return el_ring_bell();
p = strdup(p);
if (!p)
return CSstay;
ac = argify(p, &av);
if (Repeat != NO_ARG)
s = Repeat < ac ? insert_string(av[Repeat]) : el_ring_bell();
else
s = ac ? insert_string(av[ac - 1]) : CSstay;
if (av)
free(av);
free(p);
return s;
}
static el_keymap_t Map[64] = {
{ CTL('@'), mk_set },
{ CTL('A'), beg_line },
{ CTL('B'), bk_char },
{ CTL('D'), del_char },
{ CTL('E'), end_line },
{ CTL('F'), fd_char },
{ CTL('G'), el_ring_bell },
{ CTL('H'), bk_del_char },
{ CTL('I'), c_complete },
{ CTL('J'), accept_line },
{ CTL('K'), kill_line },
{ CTL('L'), refresh },
{ CTL('M'), accept_line },
{ CTL('N'), h_next },
{ CTL('O'), el_ring_bell },
{ CTL('P'), h_prev },
{ CTL('Q'), el_ring_bell },
{ CTL('R'), h_search },
{ CTL('S'), el_ring_bell },
{ CTL('T'), transpose },
{ CTL('U'), el_ring_bell },
{ CTL('V'), quote },
{ CTL('W'), bk_kill_word },
{ CTL('X'), exchange },
{ CTL('Y'), yank },
#ifdef SYSTEM_IS_WIN32
{ CTL('Z'), end_of_input },
#else
{ CTL('Z'), el_ring_bell },
#endif
{ CTL('['), meta },
{ CTL(']'), move_to_char },
{ CTL('^'), el_ring_bell },
{ CTL('_'), el_ring_bell },
{ 0, NULL }
};
static el_keymap_t MetaMap[64]= {
{ CTL('H'), bk_kill_word },
{ DEL, bk_kill_word },
{ ' ', mk_set },
{ '.', last_argument },
{ '<', h_first },
{ '>', h_last },
{ '?', c_possible },
{ 'b', bk_word },
{ 'c', case_cap_word },
{ 'd', fd_kill_word },
{ 'f', fd_word },
{ 'l', case_down_word },
{ 'm', toggle_meta_mode },
{ 'u', case_up_word },
{ 'y', yank },
{ 'w', copy_region },
{ 0, NULL }
};
static size_t find_key_in_map(int key, el_keymap_t map[], size_t mapsz)
{
size_t i;
for (i = 0; i < mapsz && map[i].Function; i++) {
if (map[i].Key == key)
return i;
}
if (i < mapsz)
return i;
return mapsz;
}
static el_status_t el_bind_key_in_map(int key, el_keymap_func_t function, el_keymap_t map[], size_t mapsz)
{
size_t creat, pos = find_key_in_map(key, map, mapsz);
/* Must check that pos is not the next to last array position,
* otherwise we will write out-of-bounds to terminate the list. */
if (pos + 1 >= mapsz) {
errno = ENOMEM;
return CSeof;
}
/* Add at end, create new? */
creat = map[pos].Function == NULL;
/* A new key so have to add it to end */
map[pos].Key = key;
map[pos].Function = function;
/* Terminate list */
if (creat) {
map[pos + 1].Key = 0;
map[pos + 1].Function = NULL;
}
return CSdone;
}
el_status_t el_bind_key(int key, el_keymap_func_t function)
{
return el_bind_key_in_map(key, function, Map, NELEMS(Map));
}
el_status_t el_bind_key_in_metamap(int key, el_keymap_func_t function)
{
return el_bind_key_in_map(key, function, MetaMap, NELEMS(MetaMap));
}
rl_getc_func_t *rl_set_getc_func(rl_getc_func_t *func)
{
rl_getc_func_t *old = rl_getc_function;
rl_getc_function = func;
return old;
}
/**
* Local Variables:
* c-file-style: "k&r"
* c-basic-offset: 4
* End:
*/
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