[unix-history] / usr.bin / vi / ex / ex_util.c

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)ex_util.c	8.6 (Berkeley) 3/23/94";
#endif /* not lint */

#include <sys/types.h>
#include <queue.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include <db.h>
#include <regex.h>

#include "vi.h"
#include "excmd.h"

/*
 * ex_getline --
 *	Return a line from the terminal.
 */
int
ex_getline(sp, fp, lenp)
	SCR *sp;
	FILE *fp;
	size_t *lenp;
{
	EX_PRIVATE *exp;
	size_t off;
	int ch;
	char *p;

	exp = EXP(sp);
	for (off = 0, p = exp->ibp;; ++off) {
		ch = getc(fp);
		if (off >= exp->ibp_len) {
			BINC_RET(sp, exp->ibp, exp->ibp_len, off + 1);
			p = exp->ibp + off;
		}
		if (ch == EOF || ch == '\n') {
			if (ch == EOF && !off)
				return (1);
			*lenp = off;
			return (0);
		}
		*p++ = ch;
	}
	/* NOTREACHED */
}

/*
 * ex_sleave --
 *	Save the terminal/signal state, not screen modification time.
 * 	Specific to ex/filter.c and ex/ex_shell.c.
 */
int
ex_sleave(sp)
	SCR *sp;
{
	struct sigaction act;
	struct stat sb;
	EX_PRIVATE *exp;

	/* Ignore sessions not using tty's. */
	if (!F_ISSET(sp->gp, G_STDIN_TTY))
		return (1);
	
	/*
	 * The old terminal values almost certainly turn on VINTR, VQUIT and
	 * VSUSP.  We don't want to interrupt the parent(s), so we ignore
	 * VINTR.  VQUIT is ignored by main() because nvi never wants to catch
	 * it.  A VSUSP handler have been installed by the screen code.
	 */
	act.sa_handler = SIG_IGN;
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;

	exp = EXP(sp);
	if (sigaction(SIGINT, &act, &exp->leave_act)) {
		msgq(sp, M_SYSERR, "sigaction");
		return (1);
	}
	if (tcgetattr(STDIN_FILENO, &exp->leave_term)) {
		msgq(sp, M_SYSERR, "tcgetattr");
		goto err;
	}
	if (tcsetattr(STDIN_FILENO,
	    TCSANOW | TCSASOFT, &sp->gp->original_termios)) {
		msgq(sp, M_SYSERR, "tcsetattr");
		/*
		 * If an error occurs, back out the changes and run
		 * without interrupts.
		 */
err:		(void)sigaction(SIGINT, &exp->leave_act, NULL);
		return (1);
	}
	/*
	 * The process may write to the terminal.  Save the access time
	 * (read) and modification time (write) of the tty; if they have
	 * changed when we restore the modes, will have to refresh the
	 * screen.
	 */
	if (fstat(STDIN_FILENO, &sb)) {
		msgq(sp, M_SYSERR, "stat: stdin");
		exp->leave_atime = exp->leave_mtime = 0;
	} else {
		exp->leave_atime = sb.st_atime;
		exp->leave_mtime = sb.st_mtime;
	}
	return (0);
}

/*
 * ex_rleave --
 *	Return the terminal/signal state, not screen modification time.
 * 	Specific to ex/filter.c and ex/ex_shell.c.
 */
void
ex_rleave(sp)
	SCR *sp;
{
	EX_PRIVATE *exp;
	struct stat sb;

	exp = EXP(sp);

	/* Turn off interrupts. */
	if (tcsetattr(STDIN_FILENO, TCSANOW | TCSASOFT, &exp->leave_term))
		msgq(sp, M_SYSERR, "tcsetattr");

	/* Reset the signal state. */
	if (sigaction(SIGINT, &exp->leave_act, NULL))
		msgq(sp, M_SYSERR, "sigaction");

	/* If the terminal was used, refresh the screen. */
	if (fstat(STDIN_FILENO, &sb) || exp->leave_atime == 0 ||
	    exp->leave_atime != sb.st_atime || exp->leave_mtime != sb.st_mtime)
		F_SET(sp, S_REFRESH);
}
Commit	Line	Data
395c4480 AM	1	/*-
	2	* Copyright (c) 1993, 1994
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)ex_util.c 8.6 (Berkeley) 3/23/94";
	36	#endif /* not lint */
	37
	38	#include <sys/types.h>
	39	#include <queue.h>
	40	#include <sys/stat.h>
	41	#include <sys/time.h>
	42
	43	#include <bitstring.h>
	44	#include <errno.h>
	45	#include <limits.h>
	46	#include <signal.h>
	47	#include <stdio.h>
	48	#include <stdlib.h>
	49	#include <string.h>
	50	#include <termios.h>
	51	#include <unistd.h>
	52
	53	#include <db.h>
	54	#include <regex.h>
	55
	56	#include "vi.h"
	57	#include "excmd.h"
	58
	59	/*
	60	* ex_getline --
	61	* Return a line from the terminal.
	62	*/
	63	int
	64	ex_getline(sp, fp, lenp)
65	SCR *sp;
66	FILE *fp;
67	size_t *lenp;
68	{
69	EX_PRIVATE *exp;
70	size_t off;
71	int ch;
72	char *p;
73
74	exp = EXP(sp);
75	for (off = 0, p = exp->ibp;; ++off) {
76	ch = getc(fp);
77	if (off >= exp->ibp_len) {
78	BINC_RET(sp, exp->ibp, exp->ibp_len, off + 1);
79	p = exp->ibp + off;
80	}
81	if (ch == EOF \|\| ch == '\n') {
82	if (ch == EOF && !off)
83	return (1);
84	*lenp = off;
85	return (0);
86	}
87	*p++ = ch;
88	}
89	/* NOTREACHED */
90	}
91
92	/*
93	* ex_sleave --
94	* Save the terminal/signal state, not screen modification time.
95	* Specific to ex/filter.c and ex/ex_shell.c.
96	*/
97	int
98	ex_sleave(sp)
99	SCR *sp;
100	{
101	struct sigaction act;
102	struct stat sb;
103	EX_PRIVATE *exp;
104
105	/* Ignore sessions not using tty's. */
106	if (!F_ISSET(sp->gp, G_STDIN_TTY))
107	return (1);
108
109	/*
110	* The old terminal values almost certainly turn on VINTR, VQUIT and
111	* VSUSP. We don't want to interrupt the parent(s), so we ignore
112	* VINTR. VQUIT is ignored by main() because nvi never wants to catch
113	* it. A VSUSP handler have been installed by the screen code.
114	*/
115	act.sa_handler = SIG_IGN;
116	sigemptyset(&act.sa_mask);
117	act.sa_flags = 0;
118
119	exp = EXP(sp);
120	if (sigaction(SIGINT, &act, &exp->leave_act)) {
121	msgq(sp, M_SYSERR, "sigaction");
122	return (1);
123	}
124	if (tcgetattr(STDIN_FILENO, &exp->leave_term)) {
125	msgq(sp, M_SYSERR, "tcgetattr");
126	goto err;
127	}
128	if (tcsetattr(STDIN_FILENO,
129	TCSANOW \| TCSASOFT, &sp->gp->original_termios)) {
130	msgq(sp, M_SYSERR, "tcsetattr");
131	/*
132	* If an error occurs, back out the changes and run
133	* without interrupts.
134	*/
135	err: (void)sigaction(SIGINT, &exp->leave_act, NULL);
136	return (1);
137	}
138	/*
139	* The process may write to the terminal. Save the access time
140	* (read) and modification time (write) of the tty; if they have
141	* changed when we restore the modes, will have to refresh the
142	* screen.
143	*/
144	if (fstat(STDIN_FILENO, &sb)) {
145	msgq(sp, M_SYSERR, "stat: stdin");
146	exp->leave_atime = exp->leave_mtime = 0;
147	} else {
148	exp->leave_atime = sb.st_atime;
149	exp->leave_mtime = sb.st_mtime;
150	}
151	return (0);
152	}
153
154	/*
155	* ex_rleave --
156	* Return the terminal/signal state, not screen modification time.
157	* Specific to ex/filter.c and ex/ex_shell.c.
158	*/
159	void
160	ex_rleave(sp)
161	SCR *sp;
162	{
163	EX_PRIVATE *exp;
164	struct stat sb;
165
166	exp = EXP(sp);
167
168	/* Turn off interrupts. */
169	if (tcsetattr(STDIN_FILENO, TCSANOW \| TCSASOFT, &exp->leave_term))
170	msgq(sp, M_SYSERR, "tcsetattr");
171
172	/* Reset the signal state. */
173	if (sigaction(SIGINT, &exp->leave_act, NULL))
174	msgq(sp, M_SYSERR, "sigaction");
175
176	/* If the terminal was used, refresh the screen. */
177	if (fstat(STDIN_FILENO, &sb) \|\| exp->leave_atime == 0 \|\|
178	exp->leave_atime != sb.st_atime \|\| exp->leave_mtime != sb.st_mtime)
179	F_SET(sp, S_REFRESH);
180	}