Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libedit/read.c	Lines:	9	225	4.0 %
Date:	2017-11-07	Branches:	2	172	1.2 %


/*	$OpenBSD: read.c,v 1.44 2016/05/25 09:36:21 schwarze Exp $	*/
/*	$NetBSD: read.c,v 1.100 2016/05/24 19:31:27 christos Exp $	*/

/*-
 * 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. 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.
 */

#include "config.h"

/*
 * read.c: Clean this junk up! This is horrible code.
 *	   Terminal read functions
 */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "el.h"
#include "fcns.h"
#include "read.h"

#define	EL_MAXMACRO	10

struct macros {
	wchar_t	**macro;
	int	  level;
	int	  offset;
};

struct el_read_t {
	struct macros	 macros;
	el_rfunc_t	 read_char;	/* Function to read a character. */
	int		 read_errno;
};

static int	read__fixio(int, int);
static int	read_char(EditLine *, wchar_t *);
static int	read_getcmd(EditLine *, el_action_t *, wchar_t *);
static void	read_clearmacros(struct macros *);
static void	read_pop(struct macros *);

/* read_init():
 *	Initialize the read stuff
 */
protected int
read_init(EditLine *el)
{
	struct macros *ma;

	if ((el->el_read = malloc(sizeof(*el->el_read))) == NULL)
		return -1;

	ma = &el->el_read->macros;
	if ((ma->macro = reallocarray(NULL, EL_MAXMACRO,
	    sizeof(*ma->macro))) == NULL) {
		free(el->el_read);
		return -1;
	}
	ma->level = -1;
	ma->offset = 0;

	/* builtin read_char */
	el->el_read->read_char = read_char;
	return 0;
}

/* el_read_end():
 *	Free the data structures used by the read stuff.
 */
protected void
read_end(struct el_read_t *el_read)
{
	read_clearmacros(&el_read->macros);
	free(el_read->macros.macro);
	el_read->macros.macro = NULL;
}

/* el_read_setfn():
 *	Set the read char function to the one provided.
 *	If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
 */
protected int
el_read_setfn(struct el_read_t *el_read, el_rfunc_t rc)
{
	el_read->read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
	return 0;
}


/* el_read_getfn():
 *	return the current read char function, or EL_BUILTIN_GETCFN
 *	if it is the default one
 */
protected el_rfunc_t
el_read_getfn(struct el_read_t *el_read)
{
	return el_read->read_char == read_char ?
	    EL_BUILTIN_GETCFN : el_read->read_char;
}


/* read__fixio():
 *	Try to recover from a read error
 */
/* ARGSUSED */
static int
read__fixio(int fd __attribute__((__unused__)), int e)
{

	switch (e) {
	case -1:		/* Make sure that the code is reachable */

#ifdef EWOULDBLOCK
	case EWOULDBLOCK:
#ifndef TRY_AGAIN
#define TRY_AGAIN
#endif
#endif /* EWOULDBLOCK */

#if defined(POSIX) && defined(EAGAIN)
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
	case EAGAIN:
#ifndef TRY_AGAIN
#define TRY_AGAIN
#endif
#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)) == -1)
			return -1;

		if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
			return -1;
		else
			e = 1;
#endif /* F_SETFL && O_NDELAY */

#ifdef FIONBIO
		{
			int zero = 0;

			if (ioctl(fd, FIONBIO, &zero) == -1)
				return -1;
			else
				e = 1;
		}
#endif /* FIONBIO */

#endif /* TRY_AGAIN */
		return e ? 0 : -1;

	case EINTR:
		return 0;

	default:
		return -1;
	}
}


/* el_push():
 *	Push a macro
 */
void
el_wpush(EditLine *el, const wchar_t *str)
{
	struct macros *ma = &el->el_read->macros;

	if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
		ma->level++;
		if ((ma->macro[ma->level] = wcsdup(str)) != NULL)
			return;
		ma->level--;
	}
	terminal_beep(el);
	terminal__flush(el);
}


/* read_getcmd():
 *	Get next command from the input stream,
 *	return 0 on success or -1 on EOF or error.
 *	Character values > 255 are not looked up in the map, but inserted.
 */
static int
read_getcmd(EditLine *el, el_action_t *cmdnum, wchar_t *ch)
{
	static const wchar_t meta = (wchar_t)0x80;
	el_action_t cmd;
	int num;

	do {
		if ((num = el_wgetc(el, ch)) != 1)
			return -1;

#ifdef	KANJI
		if ((*ch & meta)) {
			el->el_state.metanext = 0;
			cmd = CcViMap[' '];
			break;
		} else
#endif /* KANJI */

		if (el->el_state.metanext) {
			el->el_state.metanext = 0;
			*ch |= meta;
		}
		if (*ch >= N_KEYS)
			cmd = ED_INSERT;
		else
			cmd = el->el_map.current[(unsigned char) *ch];
		if (cmd == ED_SEQUENCE_LEAD_IN) {
			keymacro_value_t val;
			switch (keymacro_get(el, ch, &val)) {
			case XK_CMD:
				cmd = val.cmd;
				break;
			case XK_STR:
				el_wpush(el, val.str);
				break;
			case XK_NOD:
				return -1;
			default:
				EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
				break;
			}
		}
	} while (cmd == ED_SEQUENCE_LEAD_IN);
	*cmdnum = cmd;
	return 0;
}

/* read_char():
 *	Read a character from the tty.
 */
static int
read_char(EditLine *el, wchar_t *cp)
{
	ssize_t num_read;
	int tried = 0;
	char cbuf[MB_LEN_MAX];
	int cbp = 0;
	int save_errno = errno;

 again:
	el->el_signal->sig_no = 0;
	while ((num_read = read(el->el_infd, cbuf + cbp, 1)) == -1) {
		int e = errno;
		switch (el->el_signal->sig_no) {
		case SIGCONT:
			el_set(el, EL_REFRESH);
			/*FALLTHROUGH*/
		case SIGWINCH:
			sig_set(el);
			goto again;
		default:
			break;
		}
		if (!tried && read__fixio(el->el_infd, e) == 0) {
			errno = save_errno;
			tried = 1;
		} else {
			errno = e;
			*cp = L'\0';
			return -1;
		}
	}

	/* Test for EOF */
	if (num_read == 0) {
		*cp = L'\0';
		return 0;
	}

	for (;;) {
		mbstate_t mbs;

		++cbp;
		/* This only works because UTF8 is stateless. */
		memset(&mbs, 0, sizeof(mbs));
		switch (mbrtowc(cp, cbuf, cbp, &mbs)) {
		case (size_t)-1:
			if (cbp > 1) {
				/*
				 * Invalid sequence, discard all bytes
				 * except the last one.
				 */
				cbuf[0] = cbuf[cbp - 1];
				cbp = 0;
				break;
			} else {
				/* Invalid byte, discard it. */
				cbp = 0;
				goto again;
			}
		case (size_t)-2:
			/*
			 * We don't support other multibyte charsets.
			 * The second condition shouldn't happen
			 * and is here merely for additional safety.
			 */
			if ((el->el_flags & CHARSET_IS_UTF8) == 0 ||
			    cbp >= MB_LEN_MAX) {
				errno = EILSEQ;
				*cp = L'\0';
				return -1;
			}
			/* Incomplete sequence, read another byte. */
			goto again;
		default:
			/* Valid character, process it. */
			return 1;
		}
	}
}

/* read_pop():
 *	Pop a macro from the stack
 */
static void
read_pop(struct macros *ma)
{
	int i;

	free(ma->macro[0]);
	for (i = 0; i < ma->level; i++)
		ma->macro[i] = ma->macro[i + 1];
	ma->level--;
	ma->offset = 0;
}

static void
read_clearmacros(struct macros *ma)
{
	while (ma->level >= 0)
		free(ma->macro[ma->level--]);
	ma->offset = 0;
}

/* el_wgetc():
 *	Read a wide character
 */
int
el_wgetc(EditLine *el, wchar_t *cp)
{
	struct macros *ma = &el->el_read->macros;
	int num_read;

	terminal__flush(el);
	for (;;) {
		if (ma->level < 0)
			break;

		if (ma->macro[0][ma->offset] == '\0') {
			read_pop(ma);
			continue;
		}

		*cp = ma->macro[0][ma->offset++];

		if (ma->macro[0][ma->offset] == '\0') {
			/* Needed for QuoteMode On */
			read_pop(ma);
		}

		return 1;
	}

	if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
		return 0;

	num_read = (*el->el_read->read_char)(el, cp);

	/*
	 * Remember the original reason of a read failure
	 * such that el_wgets() can restore it after doing
	 * various cleanup operation that might change errno.
	 */
	if (num_read < 0)
		el->el_read->read_errno = errno;

	return num_read;
}

protected void
read_prepare(EditLine *el)
{
	if (el->el_flags & HANDLE_SIGNALS)
		sig_set(el);
	if (el->el_flags & NO_TTY)
		return;
	if ((el->el_flags & (UNBUFFERED|EDIT_DISABLED)) == UNBUFFERED)
		tty_rawmode(el);

	/* This is relatively cheap, and things go terribly wrong if
	   we have the wrong size. */
	el_resize(el);
	re_clear_display(el);	/* reset the display stuff */
	ch_reset(el);
	re_refresh(el);		/* print the prompt */

	if (el->el_flags & UNBUFFERED)
		terminal__flush(el);
}

protected void
read_finish(EditLine *el)
{
	if ((el->el_flags & UNBUFFERED) == 0)
		(void) tty_cookedmode(el);
	if (el->el_flags & HANDLE_SIGNALS)
		sig_clr(el);
}

const wchar_t *
el_wgets(EditLine *el, int *nread)
{
	int retval;
	el_action_t cmdnum = 0;
	int num;		/* how many chars we have read at NL */
	wchar_t wc;
	wchar_t ch, *cp;
	int crlf = 0;
	int nrb;

	if (nread == NULL)
		nread = &nrb;
	*nread = 0;
	el->el_read->read_errno = 0;

	if (el->el_flags & NO_TTY) {
		size_t idx;

		cp = el->el_line.buffer;
		while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
			*cp = wc;
			/* make sure there is space for next character */
			if (cp + 1 >= el->el_line.limit) {
				idx = (cp - el->el_line.buffer);
				if (!ch_enlargebufs(el, 2))
					break;
				cp = &el->el_line.buffer[idx];
			}
			cp++;
			if (el->el_flags & UNBUFFERED)
				break;
			if (cp[-1] == '\r' || cp[-1] == '\n')
				break;
		}
		if (num == -1 && errno == EINTR)
			cp = el->el_line.buffer;
		goto noedit;
	}


#ifdef FIONREAD
	if (el->el_tty.t_mode == EX_IO && el->el_read->macros.level < 0) {
		int chrs = 0;

		(void) ioctl(el->el_infd, FIONREAD, &chrs);
		if (chrs == 0) {
			if (tty_rawmode(el) < 0) {
				errno = 0;
				*nread = 0;
				return NULL;
			}
		}
	}
#endif /* FIONREAD */

	if ((el->el_flags & UNBUFFERED) == 0)
		read_prepare(el);

	if (el->el_flags & EDIT_DISABLED) {
		size_t idx;

		if ((el->el_flags & UNBUFFERED) == 0)
			cp = el->el_line.buffer;
		else
			cp = el->el_line.lastchar;

		terminal__flush(el);

		while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
			*cp = wc;
			/* make sure there is space next character */
			if (cp + 1 >= el->el_line.limit) {
				idx = (cp - el->el_line.buffer);
				if (!ch_enlargebufs(el, 2))
					break;
				cp = &el->el_line.buffer[idx];
			}
			cp++;
			crlf = cp[-1] == '\r' || cp[-1] == '\n';
			if (el->el_flags & UNBUFFERED)
				break;
			if (crlf)
				break;
		}
		if (num == -1 && errno == EINTR)
			cp = el->el_line.buffer;
		goto noedit;
	}

	for (num = -1; num == -1;) {  /* while still editing this line */
		/* if EOF or error */
		if (read_getcmd(el, &cmdnum, &ch) == -1)
			break;
		if ((int)cmdnum >= el->el_map.nfunc) /* BUG CHECK command */
			continue;	/* try again */
		/* now do the real command */
		/* vi redo needs these way down the levels... */
		el->el_state.thiscmd = cmdnum;
		el->el_state.thisch = ch;
		if (el->el_map.type == MAP_VI &&
		    el->el_map.current == el->el_map.key &&
		    el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
			if (cmdnum == VI_DELETE_PREV_CHAR &&
			    el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
			    && iswprint(el->el_chared.c_redo.pos[-1]))
				el->el_chared.c_redo.pos--;
			else
				*el->el_chared.c_redo.pos++ = ch;
		}
		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:
			re_refresh_cursor(el);
			break;

		case CC_REDISPLAY:
			re_clear_lines(el);
			re_clear_display(el);
			/* FALLTHROUGH */

		case CC_REFRESH:
			re_refresh(el);
			break;

		case CC_REFRESH_BEEP:
			re_refresh(el);
			terminal_beep(el);
			break;

		case CC_NORM:	/* normal char */
			break;

		case CC_ARGHACK:	/* Suggested by Rich Salz */
			/* <rsalz@pineapple.bbn.com> */
			continue;	/* keep going... */

		case CC_EOF:	/* end of file typed */
			if ((el->el_flags & UNBUFFERED) == 0)
				num = 0;
			else if (num == -1) {
				*el->el_line.lastchar++ = CONTROL('d');
				el->el_line.cursor = el->el_line.lastchar;
				num = 1;
			}
			break;

		case CC_NEWLINE:	/* normal end of line */
			num = (int)(el->el_line.lastchar - el->el_line.buffer);
			break;

		case CC_FATAL:	/* fatal error, reset to known state */
			/* put (real) cursor in a known place */
			re_clear_display(el);	/* reset the display stuff */
			ch_reset(el);	/* reset the input pointers */
			read_clearmacros(&el->el_read->macros);
			re_refresh(el); /* print the prompt again */
			break;

		case CC_ERROR:
		default:	/* functions we don't know about */
			terminal_beep(el);
			terminal__flush(el);
			break;
		}
		el->el_state.argument = 1;
		el->el_state.doingarg = 0;
		el->el_chared.c_vcmd.action = NOP;
		if (el->el_flags & UNBUFFERED)
			break;
	}

	terminal__flush(el);		/* flush any buffered output */
	/* make sure the tty is set up correctly */
	if ((el->el_flags & UNBUFFERED) == 0) {
		read_finish(el);
		*nread = num != -1 ? num : 0;
	} else {
		*nread = (int)(el->el_line.lastchar - el->el_line.buffer);
	}
	goto done;
noedit:
	el->el_line.cursor = el->el_line.lastchar = cp;
	*cp = '\0';
	*nread = (int)(el->el_line.cursor - el->el_line.buffer);
done:
	if (*nread == 0) {
		if (num == -1) {
			*nread = -1;
			if (el->el_read->read_errno)
				errno = el->el_read->read_errno;
		}
		return NULL;
	} else
		return el->el_line.buffer;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: read.c,v 1.44 2016/05/25 09:36:21 schwarze Exp $ */
2			/* $NetBSD: read.c,v 1.100 2016/05/24 19:31:27 christos Exp $ */
3
4			/*-
5			* Copyright (c) 1992, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* This code is derived from software contributed to Berkeley by
9			* Christos Zoulas of Cornell University.
10			*
11			* Redistribution and use in source and binary forms, with or without
12			* modification, are permitted provided that the following conditions
13			* are met:
14			* 1. Redistributions of source code must retain the above copyright
15			* notice, this list of conditions and the following disclaimer.
16			* 2. Redistributions in binary form must reproduce the above copyright
17			* notice, this list of conditions and the following disclaimer in the
18			* documentation and/or other materials provided with the distribution.
19			* 3. Neither the name of the University nor the names of its contributors
20			* may be used to endorse or promote products derived from this software
21			* without specific prior written permission.
22			*
23			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33			* SUCH DAMAGE.
34			*/
35
36			#include "config.h"
37
38			/*
39			* read.c: Clean this junk up! This is horrible code.
40			* Terminal read functions
41			*/
42			#include <ctype.h>
43			#include <errno.h>
44			#include <fcntl.h>
45			#include <limits.h>
46			#include <stdlib.h>
47			#include <string.h>
48			#include <unistd.h>
49
50			#include "el.h"
51			#include "fcns.h"
52			#include "read.h"
53
54			#define EL_MAXMACRO 10
55
56			struct macros {
57			wchar_t **macro;
58			int level;
59			int offset;
60			};
61
62			struct el_read_t {
63			struct macros macros;
64			el_rfunc_t read_char; /* Function to read a character. */
65			int read_errno;
66			};
67
68			static int read__fixio(int, int);
69			static int read_char(EditLine , wchar_t );
70			static int read_getcmd(EditLine , el_action_t , wchar_t *);
71			static void read_clearmacros(struct macros *);
72			static void read_pop(struct macros *);
73
74			/* read_init():
75			* Initialize the read stuff
76			*/
77			protected int
78			read_init(EditLine *el)
79			{
80			struct macros *ma;
81
82	✗✓	12	if ((el->el_read = malloc(sizeof(*el->el_read))) == NULL)
83			return -1;
84
85		6	ma = &el->el_read->macros;
86	✗✓	12	if ((ma->macro = reallocarray(NULL, EL_MAXMACRO,
87		6	sizeof(*ma->macro))) == NULL) {
88			free(el->el_read);
89			return -1;
90			}
91		6	ma->level = -1;
92		6	ma->offset = 0;
93
94			/* builtin read_char */
95		6	el->el_read->read_char = read_char;
96		6	return 0;
97		6	}
98
99			/* el_read_end():
100			* Free the data structures used by the read stuff.
101			*/
102			protected void
103			read_end(struct el_read_t *el_read)
104			{
105			read_clearmacros(&el_read->macros);
106			free(el_read->macros.macro);
107			el_read->macros.macro = NULL;
108			}
109
110			/* el_read_setfn():
111			* Set the read char function to the one provided.
112			* If it is set to EL_BUILTIN_GETCFN, then reset to the builtin one.
113			*/
114			protected int
115			el_read_setfn(struct el_read_t *el_read, el_rfunc_t rc)
116			{
117			el_read->read_char = (rc == EL_BUILTIN_GETCFN) ? read_char : rc;
118			return 0;
119			}
120
121
122			/* el_read_getfn():
123			* return the current read char function, or EL_BUILTIN_GETCFN
124			* if it is the default one
125			*/
126			protected el_rfunc_t
127			el_read_getfn(struct el_read_t *el_read)
128			{
129			return el_read->read_char == read_char ?
130			EL_BUILTIN_GETCFN : el_read->read_char;
131			}
132
133
134			/* read__fixio():
135			* Try to recover from a read error
136			*/
137			/* ARGSUSED */
138			static int
139			read__fixio(int fd __attribute__((__unused__)), int e)
140			{
141
142			switch (e) {
143			case -1: /* Make sure that the code is reachable */
144
145			#ifdef EWOULDBLOCK
146			case EWOULDBLOCK:
147			#ifndef TRY_AGAIN
148			#define TRY_AGAIN
149			#endif
150			#endif /* EWOULDBLOCK */
151
152			#if defined(POSIX) && defined(EAGAIN)
153			#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
154			case EAGAIN:
155			#ifndef TRY_AGAIN
156			#define TRY_AGAIN
157			#endif
158			#endif /* EWOULDBLOCK && EWOULDBLOCK != EAGAIN */
159			#endif /* POSIX && EAGAIN */
160
161			e = 0;
162			#ifdef TRY_AGAIN
163			#if defined(F_SETFL) && defined(O_NDELAY)
164			if ((e = fcntl(fd, F_GETFL)) == -1)
165			return -1;
166
167			if (fcntl(fd, F_SETFL, e & ~O_NDELAY) == -1)
168			return -1;
169			else
170			e = 1;
171			#endif /* F_SETFL && O_NDELAY */
172
173			#ifdef FIONBIO
174			{
175			int zero = 0;
176
177			if (ioctl(fd, FIONBIO, &zero) == -1)
178			return -1;
179			else
180			e = 1;
181			}
182			#endif /* FIONBIO */
183
184			#endif /* TRY_AGAIN */
185			return e ? 0 : -1;
186
187			case EINTR:
188			return 0;
189
190			default:
191			return -1;
192			}
193			}
194
195
196			/* el_push():
197			* Push a macro
198			*/
199			void
200			el_wpush(EditLine el, const wchar_t str)
201			{
202			struct macros *ma = &el->el_read->macros;
203
204			if (str != NULL && ma->level + 1 < EL_MAXMACRO) {
205			ma->level++;
206			if ((ma->macro[ma->level] = wcsdup(str)) != NULL)
207			return;
208			ma->level--;
209			}
210			terminal_beep(el);
211			terminal__flush(el);
212			}
213
214
215			/* read_getcmd():
216			* Get next command from the input stream,
217			* return 0 on success or -1 on EOF or error.
218			* Character values > 255 are not looked up in the map, but inserted.
219			*/
220			static int
221			read_getcmd(EditLine el, el_action_t cmdnum, wchar_t *ch)
222			{
223			static const wchar_t meta = (wchar_t)0x80;
224			el_action_t cmd;
225			int num;
226
227			do {
228			if ((num = el_wgetc(el, ch)) != 1)
229			return -1;
230
231			#ifdef KANJI
232			if ((*ch & meta)) {
233			el->el_state.metanext = 0;
234			cmd = CcViMap[' '];
235			break;
236			} else
237			#endif /* KANJI */
238
239			if (el->el_state.metanext) {
240			el->el_state.metanext = 0;
241			*ch \|= meta;
242			}
243			if (*ch >= N_KEYS)
244			cmd = ED_INSERT;
245			else
246			cmd = el->el_map.current[(unsigned char) *ch];
247			if (cmd == ED_SEQUENCE_LEAD_IN) {
248			keymacro_value_t val;
249			switch (keymacro_get(el, ch, &val)) {
250			case XK_CMD:
251			cmd = val.cmd;
252			break;
253			case XK_STR:
254			el_wpush(el, val.str);
255			break;
256			case XK_NOD:
257			return -1;
258			default:
259			EL_ABORT((el->el_errfile, "Bad XK_ type \n"));
260			break;
261			}
262			}
263			} while (cmd == ED_SEQUENCE_LEAD_IN);
264			*cmdnum = cmd;
265			return 0;
266			}
267
268			/* read_char():
269			* Read a character from the tty.
270			*/
271			static int
272			read_char(EditLine el, wchar_t cp)
273			{
274			ssize_t num_read;
275			int tried = 0;
276			char cbuf[MB_LEN_MAX];
277			int cbp = 0;
278			int save_errno = errno;
279
280			again:
281			el->el_signal->sig_no = 0;
282			while ((num_read = read(el->el_infd, cbuf + cbp, 1)) == -1) {
283			int e = errno;
284			switch (el->el_signal->sig_no) {
285			case SIGCONT:
286			el_set(el, EL_REFRESH);
287			/FALLTHROUGH/
288			case SIGWINCH:
289			sig_set(el);
290			goto again;
291			default:
292			break;
293			}
294			if (!tried && read__fixio(el->el_infd, e) == 0) {
295			errno = save_errno;
296			tried = 1;
297			} else {
298			errno = e;
299			*cp = L'\0';
300			return -1;
301			}
302			}
303
304			/* Test for EOF */
305			if (num_read == 0) {
306			*cp = L'\0';
307			return 0;
308			}
309
310			for (;;) {
311			mbstate_t mbs;
312
313			++cbp;
314			/* This only works because UTF8 is stateless. */
315			memset(&mbs, 0, sizeof(mbs));
316			switch (mbrtowc(cp, cbuf, cbp, &mbs)) {
317			case (size_t)-1:
318			if (cbp > 1) {
319			/*
320			* Invalid sequence, discard all bytes
321			* except the last one.
322			*/
323			cbuf[0] = cbuf[cbp - 1];
324			cbp = 0;
325			break;
326			} else {
327			/* Invalid byte, discard it. */
328			cbp = 0;
329			goto again;
330			}
331			case (size_t)-2:
332			/*
333			* We don't support other multibyte charsets.
334			* The second condition shouldn't happen
335			* and is here merely for additional safety.
336			*/
337			if ((el->el_flags & CHARSET_IS_UTF8) == 0 \|\|
338			cbp >= MB_LEN_MAX) {
339			errno = EILSEQ;
340			*cp = L'\0';
341			return -1;
342			}
343			/* Incomplete sequence, read another byte. */
344			goto again;
345			default:
346			/* Valid character, process it. */
347			return 1;
348			}
349			}
350			}
351
352			/* read_pop():
353			* Pop a macro from the stack
354			*/
355			static void
356			read_pop(struct macros *ma)
357			{
358			int i;
359
360			free(ma->macro[0]);
361			for (i = 0; i < ma->level; i++)
362			ma->macro[i] = ma->macro[i + 1];
363			ma->level--;
364			ma->offset = 0;
365			}
366
367			static void
368			read_clearmacros(struct macros *ma)
369			{
370			while (ma->level >= 0)
371			free(ma->macro[ma->level--]);
372			ma->offset = 0;
373			}
374
375			/* el_wgetc():
376			* Read a wide character
377			*/
378			int
379			el_wgetc(EditLine el, wchar_t cp)
380			{
381			struct macros *ma = &el->el_read->macros;
382			int num_read;
383
384			terminal__flush(el);
385			for (;;) {
386			if (ma->level < 0)
387			break;
388
389			if (ma->macro[0][ma->offset] == '\0') {
390			read_pop(ma);
391			continue;
392			}
393
394			*cp = ma->macro[0][ma->offset++];
395
396			if (ma->macro[0][ma->offset] == '\0') {
397			/* Needed for QuoteMode On */
398			read_pop(ma);
399			}
400
401			return 1;
402			}
403
404			if (tty_rawmode(el) < 0)/* make sure the tty is set up correctly */
405			return 0;
406
407			num_read = (*el->el_read->read_char)(el, cp);
408
409			/*
410			* Remember the original reason of a read failure
411			* such that el_wgets() can restore it after doing
412			* various cleanup operation that might change errno.
413			*/
414			if (num_read < 0)
415			el->el_read->read_errno = errno;
416
417			return num_read;
418			}
419
420			protected void
421			read_prepare(EditLine *el)
422			{
423			if (el->el_flags & HANDLE_SIGNALS)
424			sig_set(el);
425			if (el->el_flags & NO_TTY)
426			return;
427			if ((el->el_flags & (UNBUFFERED\|EDIT_DISABLED)) == UNBUFFERED)
428			tty_rawmode(el);
429
430			/* This is relatively cheap, and things go terribly wrong if
431			we have the wrong size. */
432			el_resize(el);
433			re_clear_display(el); /* reset the display stuff */
434			ch_reset(el);
435			re_refresh(el); /* print the prompt */
436
437			if (el->el_flags & UNBUFFERED)
438			terminal__flush(el);
439			}
440
441			protected void
442			read_finish(EditLine *el)
443			{
444			if ((el->el_flags & UNBUFFERED) == 0)
445			(void) tty_cookedmode(el);
446			if (el->el_flags & HANDLE_SIGNALS)
447			sig_clr(el);
448			}
449
450			const wchar_t *
451			el_wgets(EditLine el, int nread)
452			{
453			int retval;
454			el_action_t cmdnum = 0;
455			int num; /* how many chars we have read at NL */
456			wchar_t wc;
457			wchar_t ch, *cp;
458			int crlf = 0;
459			int nrb;
460
461			if (nread == NULL)
462			nread = &nrb;
463			*nread = 0;
464			el->el_read->read_errno = 0;
465
466			if (el->el_flags & NO_TTY) {
467			size_t idx;
468
469			cp = el->el_line.buffer;
470			while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
471			*cp = wc;
472			/* make sure there is space for next character */
473			if (cp + 1 >= el->el_line.limit) {
474			idx = (cp - el->el_line.buffer);
475			if (!ch_enlargebufs(el, 2))
476			break;
477			cp = &el->el_line.buffer[idx];
478			}
479			cp++;
480			if (el->el_flags & UNBUFFERED)
481			break;
482			if (cp[-1] == '\r' \|\| cp[-1] == '\n')
483			break;
484			}
485			if (num == -1 && errno == EINTR)
486			cp = el->el_line.buffer;
487			goto noedit;
488			}
489
490
491			#ifdef FIONREAD
492			if (el->el_tty.t_mode == EX_IO && el->el_read->macros.level < 0) {
493			int chrs = 0;
494
495			(void) ioctl(el->el_infd, FIONREAD, &chrs);
496			if (chrs == 0) {
497			if (tty_rawmode(el) < 0) {
498			errno = 0;
499			*nread = 0;
500			return NULL;
501			}
502			}
503			}
504			#endif /* FIONREAD */
505
506			if ((el->el_flags & UNBUFFERED) == 0)
507			read_prepare(el);
508
509			if (el->el_flags & EDIT_DISABLED) {
510			size_t idx;
511
512			if ((el->el_flags & UNBUFFERED) == 0)
513			cp = el->el_line.buffer;
514			else
515			cp = el->el_line.lastchar;
516
517			terminal__flush(el);
518
519			while ((num = (*el->el_read->read_char)(el, &wc)) == 1) {
520			*cp = wc;
521			/* make sure there is space next character */
522			if (cp + 1 >= el->el_line.limit) {
523			idx = (cp - el->el_line.buffer);
524			if (!ch_enlargebufs(el, 2))
525			break;
526			cp = &el->el_line.buffer[idx];
527			}
528			cp++;
529			crlf = cp[-1] == '\r' \|\| cp[-1] == '\n';
530			if (el->el_flags & UNBUFFERED)
531			break;
532			if (crlf)
533			break;
534			}
535			if (num == -1 && errno == EINTR)
536			cp = el->el_line.buffer;
537			goto noedit;
538			}
539
540			for (num = -1; num == -1;) { /* while still editing this line */
541			/* if EOF or error */
542			if (read_getcmd(el, &cmdnum, &ch) == -1)
543			break;
544			if ((int)cmdnum >= el->el_map.nfunc) /* BUG CHECK command */
545			continue; /* try again */
546			/* now do the real command */
547			/* vi redo needs these way down the levels... */
548			el->el_state.thiscmd = cmdnum;
549			el->el_state.thisch = ch;
550			if (el->el_map.type == MAP_VI &&
551			el->el_map.current == el->el_map.key &&
552			el->el_chared.c_redo.pos < el->el_chared.c_redo.lim) {
553			if (cmdnum == VI_DELETE_PREV_CHAR &&
554			el->el_chared.c_redo.pos != el->el_chared.c_redo.buf
555			&& iswprint(el->el_chared.c_redo.pos[-1]))
556			el->el_chared.c_redo.pos--;
557			else
558			*el->el_chared.c_redo.pos++ = ch;
559			}
560			retval = (*el->el_map.func[cmdnum]) (el, ch);
561
562			/* save the last command here */
563			el->el_state.lastcmd = cmdnum;
564
565			/* use any return value */
566			switch (retval) {
567			case CC_CURSOR:
568			re_refresh_cursor(el);
569			break;
570
571			case CC_REDISPLAY:
572			re_clear_lines(el);
573			re_clear_display(el);
574			/* FALLTHROUGH */
575
576			case CC_REFRESH:
577			re_refresh(el);
578			break;
579
580			case CC_REFRESH_BEEP:
581			re_refresh(el);
582			terminal_beep(el);
583			break;
584
585			case CC_NORM: /* normal char */
586			break;
587
588			case CC_ARGHACK: /* Suggested by Rich Salz */
589			/* <rsalz@pineapple.bbn.com> */
590			continue; /* keep going... */
591
592			case CC_EOF: /* end of file typed */
593			if ((el->el_flags & UNBUFFERED) == 0)
594			num = 0;
595			else if (num == -1) {
596			*el->el_line.lastchar++ = CONTROL('d');
597			el->el_line.cursor = el->el_line.lastchar;
598			num = 1;
599			}
600			break;
601
602			case CC_NEWLINE: /* normal end of line */
603			num = (int)(el->el_line.lastchar - el->el_line.buffer);
604			break;
605
606			case CC_FATAL: /* fatal error, reset to known state */
607			/* put (real) cursor in a known place */
608			re_clear_display(el); /* reset the display stuff */
609			ch_reset(el); /* reset the input pointers */
610			read_clearmacros(&el->el_read->macros);
611			re_refresh(el); /* print the prompt again */
612			break;
613
614			case CC_ERROR:
615			default: /* functions we don't know about */
616			terminal_beep(el);
617			terminal__flush(el);
618			break;
619			}
620			el->el_state.argument = 1;
621			el->el_state.doingarg = 0;
622			el->el_chared.c_vcmd.action = NOP;
623			if (el->el_flags & UNBUFFERED)
624			break;
625			}
626
627			terminal__flush(el); /* flush any buffered output */
628			/* make sure the tty is set up correctly */
629			if ((el->el_flags & UNBUFFERED) == 0) {
630			read_finish(el);
631			*nread = num != -1 ? num : 0;
632			} else {
633			*nread = (int)(el->el_line.lastchar - el->el_line.buffer);
634			}
635			goto done;
636			noedit:
637			el->el_line.cursor = el->el_line.lastchar = cp;
638			*cp = '\0';
639			*nread = (int)(el->el_line.cursor - el->el_line.buffer);
640			done:
641			if (*nread == 0) {
642			if (num == -1) {
643			*nread = -1;
644			if (el->el_read->read_errno)
645			errno = el->el_read->read_errno;
646			}
647			return NULL;
648			} else
649			return el->el_line.buffer;
650			}