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gno/lib/libedit/read.c

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/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christos Zoulas of Cornell University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if !defined(lint) && !defined(SCCSID)
static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/4/93";
#endif /* not lint && not SCCSID */
/*
* read.c: Clean this junk up! This is horrible code.
* Terminal read functions
*/
#include "sys.h"
#include <sys/errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
extern int errno;
#include "el.h"
#define OKCMD -1
#ifndef MIN
#define MIN(a,b) ((a)<(b) ? (a) : (b))
#endif
private int read__fixio __P((int, int));
private int read_preread __P((EditLine *));
private int read_getcmd __P((EditLine *, el_action_t *, char *));
#ifdef DEBUG_EDIT
private void
read_debug(el)
EditLine *el;
{
if (el->el_line.cursor > el->el_line.lastchar)
(void) fprintf(el->el_errfile, "cursor > lastchar\r\n");
if (el->el_line.cursor < el->el_line.buffer)
(void) fprintf(el->el_errfile, "cursor < buffer\r\n");
if (el->el_line.cursor > el->el_line.limit)
(void) fprintf(el->el_errfile, "cursor > limit\r\n");
if (el->el_line.lastchar > el->el_line.limit)
(void) fprintf(el->el_errfile, "lastchar > limit\r\n");
if (el->el_line.limit != &el->el_line.buffer[EL_BUFSIZ - 2])
(void) fprintf(el->el_errfile, "limit != &buffer[EL_BUFSIZ-2]\r\n");
}
#endif /* DEBUG_EDIT */
/* read__fixio():
* Try to recover from a read error
*/
private int
read__fixio(fd, e)
int fd, e;
{
switch (e) {
case -1: /* Make sure that the code is reachable */
#ifdef EWOULDBLOCK
case EWOULDBLOCK:
# define TRY_AGAIN
#endif /* EWOULDBLOCK */
#if defined(POSIX) && defined(EAGAIN)
# if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
case EAGAIN:
# define TRY_AGAIN
# endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
#endif /* POSIX && EAGAIN */
e = 0;
#ifdef TRY_AGAIN
# if defined(F_SETFL) && defined(O_NDELAY)
if ((e = fcntl(fd, F_GETFL, 0)) == -1)
return -1;
if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
return -1;
else
e = 1;
# endif /* F_SETFL && O_NDELAY */
# ifdef FIONBIO
if (ioctl(fd, FIONBIO, (ioctl_t) &e) == -1)
return -1;
else
e = 1;
# endif /* FIONBIO */
#endif /* TRY_AGAIN */
return e ? 0 : -1;
case EINTR:
return 0;
default:
return -1;
}
}
/* read_preread():
* Try to read the stuff in the input queue;
*/
private int
read_preread(EditLine *el)
{
int chrs = 0;
if (el->el_chared.c_macro.nline) {
el_free((ptr_t) el->el_chared.c_macro.nline);
el->el_chared.c_macro.nline = NULL;
}
if (el->el_tty.t_mode == ED_IO)
return 0;
#ifdef FIONREAD
(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs);
if (chrs > 0) {
char buf[EL_BUFSIZ];
chrs = read(el->el_infd, buf, (size_t) MIN(chrs, EL_BUFSIZ - 1));
if (chrs > 0) {
buf[chrs] = '\0';
el->el_chared.c_macro.nline = strdup(buf);
#if 0
/* gdr: original version */
el_push(el->el_chared.c_macro.nline);
#else
el_push(el, el->el_chared.c_macro.nline);
#endif
}
}
#endif /* FIONREAD */
return chrs > 0;
}
/* el_push():
* Push a macro
*/
public void
el_push(el, str)
EditLine *el;
const char *str;
{
c_macro_t *ma = &el->el_chared.c_macro;
if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
ma->level++;
ma->macro[ma->level] = (char *) str;
}
else {
term_beep(el);
term__flush();
}
}
/* read_getcmd():
* Return next command from the input stream.
*/
private int
read_getcmd(el, cmdnum, ch)
EditLine *el;
el_action_t *cmdnum;
char *ch;
{
el_action_t cmd = 0;
int num;
while (cmd == 0 || cmd == ED_SEQUENCE_LEAD_IN) {
if ((num = el_getc(el, ch)) != 1) /* if EOF or error */
return num;
#ifdef KANJI
if ((*ch & 0200)) {
el->el_state.metanext = 0;
cmd = CcViMap[' '];
break;
}
else
#endif /* KANJI */
if (el->el_state.metanext) {
el->el_state.metanext = 0;
*ch |= 0200;
}
cmd = el->el_map.current[(unsigned char) *ch];
if (cmd == ED_SEQUENCE_LEAD_IN) {
key_value_t val;
switch (key_get(el, ch, &val)) {
case XK_CMD:
cmd = val.cmd;
break;
case XK_STR:
el_push(el, val.str);
break;
#ifdef notyet
case XK_EXE:
/* XXX: In the future to run a user function */
RunCommand(val.str);
break;
#endif
default:
abort();
break;
}
}
if (el->el_map.alt == NULL)
el->el_map.current = el->el_map.key;
}
*cmdnum = cmd;
return OKCMD;
}
/* el_getc():
* Read a character
*/
public int
el_getc(EditLine *el, char *cp)
{
int num_read;
unsigned char tcp;
int tried = 0;
c_macro_t *ma = &el->el_chared.c_macro;
term__flush();
for (;;) {
if (ma->level < 0) {
if (!read_preread(el))
break;
}
if (ma->level < 0)
break;
if (*ma->macro[ma->level] == 0) {
ma->level--;
continue;
}
*cp = *ma->macro[ma->level]++ & 0377;
if (*ma->macro[ma->level] == 0) { /* Needed for QuoteMode On */
ma->level--;
}
return 1;
}
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "Turning raw mode on\n");
#endif /* DEBUG_READ */
if (tty_rawmode(el) < 0) /* make sure the tty is set up correctly */
return 0;
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "Reading a character\n");
#endif /* DEBUG_READ */
while ((num_read = read(el->el_infd, (char *) &tcp, 1)) == -1)
if (!tried && read__fixio(el->el_infd, errno) == 0)
tried = 1;
else {
*cp = '\0';
return -1;
}
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "Got it %c\n", tcp);
#endif /* DEBUG_READ */
*cp = tcp;
return num_read;
}
public const char *
el_gets(EditLine *el, int *nread)
{
int retval;
el_action_t cmdnum = 0;
int num; /* how many chars we have read at NL */
char ch;
#if 1
/* gdr: this wasn't here in the original. cut&paste from above */
c_macro_t *ma = &el->el_chared.c_macro;
#endif
if (el->el_flags & HANDLE_SIGNALS)
sig_set(el);
re_clear_display(el); /* reset the display stuff */
ch_reset(el);
#ifdef FIONREAD
if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
long chrs = 0;
(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) &chrs);
if (chrs == 0) {
if (tty_rawmode(el) < 0) {
if (nread)
*nread = 0;
return NULL;
}
}
}
#endif /* FIONREAD */
re_refresh(el); /* print the prompt */
for (num = OKCMD; num == OKCMD;) { /* while still editing this line */
#ifdef DEBUG_EDIT
read_debug(el);
#endif /* DEBUG_EDIT */
/* if EOF or error */
if ((num = read_getcmd(el, &cmdnum, &ch)) != OKCMD) {
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "Returning from el_gets %d\n", num);
#endif /* DEBUG_READ */
break;
}
if (cmdnum >= el->el_map.nfunc) { /* BUG CHECK command */
#ifdef DEBUG_EDIT
(void) fprintf(el->el_errfile,
"ERROR: illegal command from key 0%o\r\n", ch);
#endif /* DEBUG_EDIT */
continue; /* try again */
}
/* now do the real command */
#ifdef DEBUG_READ
{
el_bindings_t *b;
for (b = el->el_map.help; b->name; b++)
if (b->func == cmdnum)
break;
if (b->name)
(void) fprintf(el->el_errfile, "Executing %s\n", b->name);
else
(void) fprintf(el->el_errfile, "Error command = %d\n", cmdnum);
}
#endif /* DEBUG_READ */
retval = (*el->el_map.func[cmdnum])(el, ch);
/* save the last command here */
el->el_state.lastcmd = cmdnum;
/* use any return value */
switch (retval) {
case CC_CURSOR:
el->el_state.argument = 1;
el->el_state.doingarg = 0;
re_refresh_cursor(el);
break;
case CC_REFRESH:
el->el_state.argument = 1;
el->el_state.doingarg = 0;
re_refresh(el);
break;
case CC_NORM: /* normal char */
el->el_state.argument = 1;
el->el_state.doingarg = 0;
break;
case CC_ARGHACK: /* Suggested by Rich Salz */
/* <rsalz@pineapple.bbn.com> */
break; /* keep going... */
case CC_EOF: /* end of file typed */
num = 0;
break;
case CC_NEWLINE: /* normal end of line */
num = el->el_line.lastchar - el->el_line.buffer;
break;
case CC_FATAL: /* fatal error, reset to known state */
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "*** editor fatal ERROR ***\r\n\n");
#endif /* DEBUG_READ */
/* put (real) cursor in a known place */
re_clear_display(el); /* reset the display stuff */
ch_reset(el); /* reset the input pointers */
re_refresh(el); /* print the prompt again */
el->el_state.argument = 1;
el->el_state.doingarg = 0;
break;
case CC_ERROR:
default: /* functions we don't know about */
#ifdef DEBUG_READ
(void) fprintf(el->el_errfile, "*** editor ERROR ***\r\n\n");
#endif /* DEBUG_READ */
el->el_state.argument = 1;
el->el_state.doingarg = 0;
term_beep(el);
term__flush();
break;
}
}
(void) tty_cookedmode(el); /* make sure the tty is set up correctly */
term__flush(); /* flush any buffered output */
if (el->el_flags & HANDLE_SIGNALS)
sig_clr(el);
if (nread)
*nread = num;
return num ? el->el_line.buffer : NULL;
}
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