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EDITLINE(3) |
FreeBSD Library Functions Manual |
EDITLINE(3) |
editline , el_init ,
el_init_fd , el_end ,
el_reset , el_gets ,
el_wgets , el_getc ,
el_wgetc , el_push ,
el_wpush , el_parse ,
el_wparse , el_set ,
el_wset , el_get ,
el_wget , el_source ,
el_resize , el_cursor ,
el_line , el_wline ,
el_insertstr , el_winsertstr ,
el_deletestr , el_wdeletestr ,
history_init , history_winit ,
history_end , history_wend ,
history , history_w ,
tok_init , tok_winit ,
tok_end , tok_wend ,
tok_reset , tok_wreset ,
tok_line , tok_wline ,
tok_str , tok_wstr —
line editor, history and tokenization functions
Command Line Editor Library (libedit, -ledit)
#include <histedit.h>
EditLine *
el_init (const
char *prog, FILE
*fin, FILE *fout,
FILE *ferr);
EditLine *
el_init_fd (const
char *prog, FILE
*fin, FILE *fout,
FILE *ferr,
int fdin,
int fdout,
int fderr);
void
el_end (EditLine
*e);
void
el_reset (EditLine
*e);
const char *
el_gets (EditLine
*e, int
*count);
const wchar_t *
el_wgets (EditLine
*e, int
*count);
int
el_getc (EditLine
*e, char *ch);
int
el_wgetc (EditLine
*e, wchar_t
*wc);
void
el_push (EditLine
*e, const char
*mbs);
void
el_wpush (EditLine
*e, const wchar_t
*wcs);
int
el_parse (EditLine
*e, int argc,
const char *argv[]);
int
el_wparse (EditLine
*e, int argc,
const wchar_t
*argv[]);
int
el_set (EditLine
*e, int op,
...);
int
el_wset (EditLine
*e, int op,
...);
int
el_get (EditLine
*e, int op,
...);
int
el_wget (EditLine
*e, int op,
...);
int
el_source (EditLine
*e, const char
*file);
void
el_resize (EditLine
*e);
int
el_cursor (EditLine
*e, int count);
const LineInfo *
el_line (EditLine
*e);
const LineInfoW *
el_wline (EditLine
*e);
int
el_insertstr (EditLine
*e, const char
*str);
int
el_winsertstr (EditLine
*e, const wchar_t
*str);
void
el_deletestr (EditLine
*e, int count);
void
el_wdeletestr (EditLine
*e, int count);
History *
history_init (void);
HistoryW *
history_winit (void);
void
history_end (History
*h);
void
history_wend (HistoryW
*h);
int
history (History
*h, HistEvent *ev,
int op,
...);
int
history_w (HistoryW
*h, HistEventW *ev,
int op,
...);
Tokenizer *
tok_init (const
char *IFS);
TokenizerW *
tok_winit (const
wchar_t *IFS);
void
tok_end (Tokenizer
*t);
void
tok_wend (TokenizerW
*t);
void
tok_reset (Tokenizer
*t);
void
tok_wreset (TokenizerW
*t);
int
tok_line (Tokenizer
*t, const LineInfo
*li, int *argc,
const char **argv[],
int *cursorc,
int *cursoro);
int
tok_wline (TokenizerW
*t, const LineInfoW
*li, int *argc,
const wchar_t **argv[],
int *cursorc,
int *cursoro);
int
tok_str (Tokenizer
*t, const char
*str, int *argc,
const char **argv[]);
int
tok_wstr (TokenizerW
*t, const wchar_t
*str, int *argc,
const wchar_t
**argv[]);
The editline library provides generic line editing,
history and tokenization functions, similar to those found in
sh(1).
These functions are available in the
libedit library (which needs the
libtermcap library). Programs should be linked with
-ledit -ltermcap .
The editline library respects the
LC_CTYPE locale set by the application program and
never uses
setlocale(3)
to change the locale.
The line editing functions use a common data structure,
EditLine, which is created by
el_init () or el_init_fd () and
freed by el_end ().
The wide-character functions behave the same way as their narrow
counterparts.
The following functions are available:
el_init ()
- Initialize the line editor, and return a data structure to be used by all
other line editing functions, or
NULL on failure.
prog is the name of the invoking program, used when
reading the
editrc(5)
file to determine which settings to use. fin,
fout and ferr are the input,
output, and error streams (respectively) to use. In this documentation,
references to “the tty” are actually to this input/output
stream combination.
el_init_fd ()
- Like
el_init () but allows specifying file
descriptors for the
stdio(3)
corresponding streams, in case those were created with
funopen(3).
el_end ()
- Clean up and finish with e, assumed to have been
created with
el_init () or
el_init_fd ().
el_reset ()
- Reset the tty and the parser. This should be called after an error which
may have upset the tty's state.
el_gets ()
- Read a line from the tty. count is modified to
contain the number of characters read. Returns the line read if
successful, or
NULL if no characters were read or
if an error occurred. If an error occurred, count is
set to -1 and errno contains the error code that
caused it. The return value may not remain valid across calls to
el_gets () and must be copied if the data is to be
retained.
el_wgetc ()
- Read a wide character from the tty, respecting the current locale, or from
the input queue described in
editline(7)
if that is not empty, and store it in wc. If an
invalid or incomplete character is found, it is discarded,
errno is set to
EILSEQ , and
the next character is read and stored in wc. Returns
1 if a valid character was read, 0 on end of file, or -1 on
read(2)
failure. In the latter case, errno is set to
indicate the error.
el_getc ()
- Read a wide character as described for
el_wgetc ()
and return 0 on end of file or -1 on failure. If the wide character can be
represented as a single-byte character, convert it with
wctob(3),
store the result in ch, and return 1; otherwise, set
errno to ERANGE and return
-1. In the C or POSIX locale, this simply reads a byte, but for any other
locale, including UTF-8, this is rarely useful.
el_wpush ()
- Push the wide character string wcs back onto the
input queue described in
editline(7).
If the queue overflows, for example due to a recursive macro, or if an
error occurs, for example because wcs is
NULL or memory allocation fails, the function
beeps at the user, but does not report the problem to the caller.
el_push ()
- Use the current locale to convert the multibyte string
mbs to a wide character string, and pass the result
to
el_wpush ().
el_parse ()
- Parses the argv array (which is
argc elements in size) to execute builtin
editline commands. If the command is prefixed with
“prog”: then el_parse () will only
execute the command if “prog” matches the
prog argument supplied to
el_init (). The return value is -1 if the command
is unknown, 0 if there was no error or “prog” didn't match,
or 1 if the command returned an error. Refer to
editrc(5)
for more information.
el_set ()
- Set
editline parameters. op
determines which parameter to set, and each operation has its own
parameter list. Returns 0 on success, -1 on failure.
The following values for op are
supported, along with the required argument list:
EL_PROMPT ,
char *(*f)(EditLine *)
- Define prompt printing function as f, which is
to return a string that contains the prompt.
EL_PROMPT_ESC ,
char *(*f)(EditLine *), char
c
- Same as
EL_PROMPT , but the
c argument indicates the start/stop literal
prompt character.
If a start/stop literal character is found in the prompt,
the character itself is not printed, but characters after it are
printed directly to the terminal without affecting the state of the
current line. A subsequent second start/stop literal character ends
this behavior. This is typically used to embed literal escape
sequences that change the color/style of the terminal in the prompt.
Note that the literal escape character cannot be the last character
in the prompt, as the escape sequence is attached to the next
character in the prompt. 0 unsets it.
EL_REFRESH
- Re-display the current line on the next terminal line.
EL_RPROMPT ,
char *(*f)(EditLine *)
- Define right side prompt printing function as f,
which is to return a string that contains the prompt.
EL_RPROMPT_ESC ,
char *(*f)(EditLine *), char
c
- Define the right prompt printing function but with a literal escape
character.
EL_TERMINAL ,
const char *type
- Define terminal type of the tty to be type, or
to
TERM if type is
NULL .
EL_EDITOR ,
const char *mode
- Set editing mode to mode, which must be one of
“emacs” or “vi”.
EL_SIGNAL ,
int flag
- If flag is non-zero,
editline will install its own signal handler
for the following signals when reading command input:
SIGCONT , SIGHUP ,
SIGINT , SIGQUIT ,
SIGSTOP , SIGTERM ,
SIGTSTP , and SIGWINCH .
Otherwise, the current signal handlers will be used.
EL_BIND ,
const char *, ...,
NULL
- Perform the
bind builtin command. Refer to
editrc(5)
for more information.
EL_ECHOTC ,
const char *, ...,
NULL
- Perform the
echotc builtin command. Refer to
editrc(5)
for more information.
EL_SETTC ,
const char *, ...,
NULL
- Perform the
settc builtin command. Refer to
editrc(5)
for more information.
EL_SETTY ,
const char *, ...,
NULL
- Perform the
setty builtin command. Refer to
editrc(5)
for more information.
EL_TELLTC ,
const char *, ...,
NULL
- Perform the
telltc builtin command. Refer to
editrc(5)
for more information.
EL_ADDFN ,
const char *name, const char
*help, unsigned char (*func)(EditLine *e, int
ch)
- Add a user defined function,
func (), referred
to as name which is invoked when a key which is
bound to name is entered.
help is a description of
name. At invocation time,
ch is the key which caused the invocation. The
return value of func () should be one of:
CC_NORM
- Add a normal character.
CC_NEWLINE
- End of line was entered.
CC_EOF
- EOF was entered.
CC_ARGHACK
- Expecting further command input as arguments, do nothing
visually.
CC_REFRESH
- Refresh display.
CC_REFRESH_BEEP
- Refresh display, and beep.
CC_CURSOR
- Cursor moved, so update and perform
CC_REFRESH .
CC_REDISPLAY
- Redisplay entire input line. This is useful if a key binding
outputs extra information.
CC_ERROR
- An error occurred. Beep, and flush tty.
CC_FATAL
- Fatal error, reset tty to known state.
EL_HIST ,
History *(*func)(History *, int op, ...),
const char *ptr
- Defines which history function to use, which is usually
history (). ptr should be
the value returned by history_init ().
EL_EDITMODE ,
int flag
- If flag is non-zero, editing is enabled (the
default). Note that this is only an indication, and does not affect
the operation of
editline . At this time, it is
the caller's responsibility to check this (using
el_get ()) to determine if editing should be
enabled or not.
EL_UNBUFFERED ,
int flag
- If flag is zero, unbuffered mode is disabled
(the default). In unbuffered mode,
el_gets ()
will return immediately after processing a single character.
EL_GETCFN ,
el_rfunc_t f
- Whenever reading a character, use the function
int
f (EditLine *e,
wchar_t *wc);
which stores the character in wc and returns 1 on
success, 0 on end of file, or -1 on I/O or encoding errors. Functions
internally using it include el_wgets (),
el_wgetc (), el_gets (),
and el_getc (). Initially, a builtin function
is installed, and replacing it is discouraged because writing such a
function is very error prone. The builtin function can be restored at
any time by passing the special value
EL_BUILTIN_GETCFN instead of a function
pointer.
EL_CLIENTDATA ,
void *data
- Register data to be associated with this
EditLine structure. It can be retrieved with the corresponding
el_get () call.
EL_SETFP ,
int fd, FILE *fp
- Set the current
editline file pointer for
“input” fd =
0 , “output”
fd = 1 , or
“error” fd =
2 from fp.
el_get ()
- Get
editline parameters. op
determines which parameter to retrieve into result.
Returns 0 if successful, -1 otherwise.
The following values for op are
supported, along with actual type of result:
EL_PROMPT ,
char *(*f)(EditLine *), char
*c
- Set f to a pointer to the function that displays
the prompt. If c is not
NULL , set it to the start/stop literal prompt
character.
EL_RPROMPT ,
char *(*f)(EditLine *), char
*c
- Set f to a pointer to the function that displays
the prompt. If c is not
NULL , set it to the start/stop literal prompt
character.
EL_EDITOR ,
const char **n
- Set the name of the editor in n, which will be
one of “emacs” or “vi”.
EL_GETTC ,
const char *name, void
*value
- If name is a valid
termcap(5)
capability set value to the current value of
that capability.
EL_SIGNAL ,
int *s
- Set s to non-zero if
editline has installed private signal handlers
(see el_get () above).
EL_EDITMODE ,
int *c
- Set c to non-zero if editing is enabled.
EL_GETCFN ,
el_rfunc_t *f
- Set f to a pointer to the function that reads
characters, or to
EL_BUILTIN_GETCFN if the
builtin function is in use.
EL_CLIENTDATA ,
void **data
- Set data to the previously registered client
data set by an
el_set () call.
EL_UNBUFFERED ,
int *c
- Set c to non-zero if unbuffered mode is
enabled.
EL_GETFP ,
int fd, FILE **fp
- Set fp to the current
editline file pointer for
“input” fd =
0 , “output”
fd = 1 , or
“error” fd =
2 .
el_source ()
- Initialize
editline by reading the contents of
file. el_parse () is called
for each line in file. If file
is NULL , try $EDITRC and
if that is not set $HOME/.editrc. Refer to
editrc(5)
for details on the format of file.
el_source () returns 0 on success and -1 on
error.
el_resize ()
- Must be called if the terminal size changes. If
EL_SIGNAL has been set with
el_set (), then this is done automatically.
Otherwise, it's the responsibility of the application to call
el_resize () on the appropriate occasions.
el_cursor ()
- Move the cursor to the right (if positive) or to the left (if negative)
count characters. Returns the resulting offset of
the cursor from the beginning of the line.
el_line ()
- Return the editing information for the current line in a
LineInfo structure, which is defined as follows:
typedef struct lineinfo {
const char *buffer; /* address of buffer */
const char *cursor; /* address of cursor */
const char *lastchar; /* address of last character */
} LineInfo;
buffer is not NUL terminated. This
function may be called after el_gets () to obtain
the LineInfo structure pertaining to line returned
by that function, and from within user defined functions added with
EL_ADDFN .
el_insertstr ()
- Insert str into the line at the cursor. Returns -1
if str is empty or won't fit, and 0 otherwise.
el_deletestr ()
- Delete count characters before the cursor.
The history functions use a common data structure,
History, which is created by
history_init () and freed by
history_end ().
The following functions are available:
history_init ()
- Initialize the history list, and return a data structure to be used by all
other history list functions, or
NULL on
failure.
history_end ()
- Clean up and finish with h, assumed to have been
created with
history_init ().
history ()
- Perform operation op on the history list, with
optional arguments as needed by the operation. ev is
changed accordingly to operation. The following values for
op are supported, along with the required argument
list:
H_SETSIZE ,
int size
- Set size of history to size elements.
H_GETSIZE
- Get number of events currently in history.
H_END
- Cleans up and finishes with h, assumed to be
created with
history_init ().
H_CLEAR
- Clear the history.
H_FUNC ,
void *ptr, history_gfun_t
first, history_gfun_t next,
history_gfun_t last,
history_gfun_t prev,
history_gfun_t curr,
history_sfun_t set, history_vfun_t
clear, history_efun_t enter,
history_efun_t add
- Define functions to perform various history operations.
ptr is the argument given to a function when
it's invoked.
H_FIRST
- Return the first element in the history.
H_LAST
- Return the last element in the history.
H_PREV
- Return the previous element in the history. It is newer than the
current one.
H_NEXT
- Return the next element in the history. It is older than the current
one.
H_CURR
- Return the current element in the history.
H_SET ,
int position
- Set the cursor to point to the requested element.
H_ADD ,
const char *str
- Append str to the current element of the
history, or perform the
H_ENTER operation with
argument str if there is no current
element.
H_APPEND ,
const char *str
- Append str to the last new element of the
history.
H_ENTER ,
const char *str
- Add str as a new element to the history and, if
necessary, removing the oldest entry to keep the list to the created
size. If
H_SETUNIQUE has been called with a
non-zero argument, the element will not be entered into the history if
its contents match the ones of the current history element. If the
element is entered history () returns 1; if it
is ignored as a duplicate returns 0. Finally
history () returns -1 if an error
occurred.
H_PREV_STR ,
const char *str
- Return the closest previous event that starts with
str.
H_NEXT_STR ,
const char *str
- Return the closest next event that starts with
str.
H_PREV_EVENT ,
int e
- Return the previous event numbered e.
H_NEXT_EVENT ,
int e
- Return the next event numbered e.
H_LOAD ,
const char *file
- Load the history list stored in file.
H_SAVE ,
const char *file
- Save the history list to file.
H_SAVE_FP ,
FILE *fp
- Save the history list to the opened FILE pointer
fp.
H_NSAVE_FP ,
size_t n, FILE *fp
- Save the last n history entries to the opened
FILE pointer fp.
H_SETUNIQUE ,
int unique
- Set flag that adjacent identical event strings should not be entered
into the history.
H_GETUNIQUE
- Retrieve the current setting if adjacent identical elements should be
entered into the history.
H_DEL ,
int e
- Delete the event numbered e. This function is
only provided for
readline compatibility. The
caller is responsible for free'ing the string in the returned
HistEvent.
history () returns >= 0 if the
operation op succeeds. Otherwise, -1 is returned
and ev is updated to contain more details about
the error.
The tokenization functions use a common data structure,
Tokenizer, which is created by
tok_init () and freed by
tok_end ().
The following functions are available:
tok_init ()
- Initialize the tokenizer, and return a data structure to be used by all
other tokenizer functions. IFS contains the Input
Field Separators, which defaults to ⟨space⟩,
⟨tab⟩, and ⟨newline⟩ if
NULL .
tok_end ()
- Clean up and finish with t, assumed to have been
created with
tok_init ().
tok_reset ()
- Reset the tokenizer state. Use after a line has been successfully
tokenized by
tok_line () or
tok_str () and before a new line is to be
tokenized.
tok_line ()
- Tokenize li, If successful, modify:
argv to contain the words,
argc to contain the number of words,
cursorc (if not
NULL ) to
contain the index of the word containing the cursor, and
cursoro (if not NULL ) to
contain the offset within argv[cursorc] of the
cursor.
Returns 0 if successful, -1 for an internal error, 1 for an
unmatched single quote, 2 for an unmatched double quote, and 3 for a
backslash quoted ⟨newline⟩. A positive exit code indicates
that another line should be read and tokenization attempted again.
tok_str ()
- A simpler form of
tok_line ();
str is a NUL terminated string to tokenize.
The editline library first appeared in
4.4BSD. CC_REDISPLAY appeared
in NetBSD 1.3.
CC_REFRESH_BEEP , EL_EDITMODE
and the readline emulation appeared in NetBSD 1.4.
EL_RPROMPT appeared in NetBSD
1.5.
The editline library was written by
Christos Zoulas. Luke Mewburn
wrote this manual and implemented CC_REDISPLAY ,
CC_REFRESH_BEEP , EL_EDITMODE ,
and EL_RPROMPT . Jaromir
Dolecek implemented the readline emulation. Johny
Mattsson implemented wide-character support.
At this time, it is the responsibility of the caller to check the result of the
EL_EDITMODE operation of
el_get () (after an el_source ()
or el_parse ()) to determine if
editline should be used for further input. I.e.,
EL_EDITMODE is purely an indication of the result of
the most recent
editrc(5)
edit command.
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