/*- * 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[] = "@(#)sex_term.c 8.40 (Berkeley) 8/17/94"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include "compat.h" #include #include #include "vi.h" #include "excmd.h" #include "../ex/script.h" /* * sex_key_read -- * Read characters from the input. */ enum input sex_key_read(sp, nrp, timeout) SCR *sp; int *nrp; struct timeval *timeout; { struct timeval t, *tp; GS *gp; IBUF *tty; int maxfd, nr; *nrp = 0; gp = sp->gp; tty = gp->tty; /* * We're about to block; check for signals. If a signal received, * clear it immediately, so that if it's reset while being serviced * we won't miss it. * * These signal recipients set global flags. None of this has * anything to do with input keys, but it's something that can't * be done asynchronously without adding locking to handle race * conditions, and which needs to be done periodically. */ sigchk: while (F_ISSET(gp, G_SIGINT | G_SIGWINCH)) { if (F_ISSET(gp, G_SIGINT)) return (INP_INTR); if (F_ISSET(gp, G_SIGWINCH)) { F_CLR(gp, G_SIGWINCH); if (!sp->s_window(sp, 1)) (void)sp->s_refresh(sp, sp->ep); } } /* * There are three cases here: * * 1: A read from a file or a pipe. In this case, the reads * never timeout regardless. This means that we can hang * when trying to complete a map, but we're going to hang * on the next read anyway. */ if (!F_ISSET(gp, G_STDIN_TTY)) { if ((nr = read(STDIN_FILENO, tty->ch + tty->next + tty->cnt, tty->nelem - (tty->next + tty->cnt))) > 0) goto success; return (INP_EOF); } /* * 2: A read with an associated timeout. In this case, we are trying * to complete a map sequence. Ignore script windows and timeout * as specified. If input arrives, we fall into #3, but because * timeout isn't NULL, don't read anything but command input. * * If interrupted, go back and check to see what it was. */ if (timeout != NULL) { if (F_ISSET(sp, S_SCRIPT)) FD_CLR(sp->script->sh_master, &sp->rdfd); FD_SET(STDIN_FILENO, &sp->rdfd); for (;;) { switch (select(STDIN_FILENO + 1, &sp->rdfd, NULL, NULL, timeout)) { case -1: /* Error or interrupt. */ if (errno == EINTR) goto sigchk; goto err; case 1: /* Characters ready. */ break; case 0: /* Timeout. */ return (INP_OK); } break; } } /* * 3: At this point, we'll take anything that comes. Select on the * command file descriptor and the file descriptor for the script * window if there is one. Poll the fd's, increasing the timeout * each time each time we don't get anything until we're blocked * on I/O. * * If interrupted, go back and check to see what it was. */ for (t.tv_sec = t.tv_usec = 0;;) { /* * Reset each time -- sscr_input() may call other * routines which could reset bits. */ if (timeout == NULL && F_ISSET(sp, S_SCRIPT)) { tp = &t; FD_SET(STDIN_FILENO, &sp->rdfd); if (F_ISSET(sp, S_SCRIPT)) { FD_SET(sp->script->sh_master, &sp->rdfd); maxfd = MAX(STDIN_FILENO, sp->script->sh_master); } else maxfd = STDIN_FILENO; } else { tp = NULL; FD_SET(STDIN_FILENO, &sp->rdfd); if (F_ISSET(sp, S_SCRIPT)) FD_CLR(sp->script->sh_master, &sp->rdfd); maxfd = STDIN_FILENO; } switch (select(maxfd + 1, &sp->rdfd, NULL, NULL, tp)) { case -1: /* Error or interrupt. */ if (errno == EINTR) goto sigchk; err: msgq(sp, M_SYSERR, "select"); return (INP_ERR); case 0: /* Timeout. */ if (t.tv_usec) { ++t.tv_sec; t.tv_usec = 0; } else t.tv_usec += 500000; continue; } if (timeout == NULL && F_ISSET(sp, S_SCRIPT) && FD_ISSET(sp->script->sh_master, &sp->rdfd)) { sscr_input(sp); continue; } switch (nr = read(STDIN_FILENO, tty->ch + tty->next + tty->cnt, tty->nelem - (tty->next + tty->cnt))) { case 0: /* EOF. */ return (INP_EOF); case -1: /* Error or interrupt. */ if (errno == EINTR) goto sigchk; msgq(sp, M_SYSERR, "read"); return (INP_ERR); default: goto success; } /* NOTREACHED */ } success: MEMSET(tty->chf + tty->next + tty->cnt, 0, nr); tty->cnt += *nrp = nr; return (INP_OK); }