diff options
Diffstat (limited to 'usr.bin/vi/ex/ex_util.c')
| -rw-r--r-- | usr.bin/vi/ex/ex_util.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/usr.bin/vi/ex/ex_util.c b/usr.bin/vi/ex/ex_util.c new file mode 100644 index 000000000000..05bf9bd85c86 --- /dev/null +++ b/usr.bin/vi/ex/ex_util.c @@ -0,0 +1,180 @@ +/*- + * 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); +} |