Merging upstream version 2.40.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 87 insertions, 48 deletions

diff --git a/text-utils/more.c b/text-utils/more.c
index 22adaab..1badf67 100644
--- a/text-utils/more.c
+++ b/text-utils/more.c
@@ -198,6 +198,7 @@ struct more_control {
 	magic_t magic;			/* libmagic database entries */
 #endif
 	unsigned int
+		ignore_stdin:1,		/* POLLHUP; peer closed pipe */
 		bad_stdout:1,		/* true if overwriting does not turn off standout */
 		catch_suspend:1,	/* we should catch the SIGTSTP signal */
 		clear_line_ends:1,	/* do not scroll, paint each screen from the top */
@@ -298,7 +299,7 @@ static void argscan(struct more_control *ctl, int as_argc, char **as_argv)
 			}
 		}
 		if (move) {
-			as_argc = remote_entry(as_argv, opt, as_argc);
+			as_argc = remove_entry(as_argv, opt, as_argc);
 			opt--;
 		}
 	}
@@ -353,12 +354,12 @@ static void env_argscan(struct more_control *ctl, const char *s)
 	char *str = xstrdup(s);
 	char *key = NULL, *tok;
 
-	env_argv = xmalloc(sizeof(char *) * size);
+	env_argv = xreallocarray(NULL, size, sizeof(char *));
 	env_argv[0] = _("MORE environment variable");	/* program name */
 	for (tok = strtok_r(str, delim, &key); tok; tok = strtok_r(NULL, delim, &key)) {
 		if (size == env_argc) {
 			size *= 2;
-			env_argv = xrealloc(env_argv, sizeof(char *) * size);
+			env_argv = xreallocarray(env_argv, size, sizeof(char *));
 		}
 		env_argv[env_argc++] = tok;
 	}
@@ -625,9 +626,6 @@ static int get_line(struct more_control *ctl, int *length)
 			*p++ = 'L';
 			column += 2;
 			ctl->is_paused = 1;
-		} else if (c == EOF) {
-			*length = p - ctl->line_buf;
-			return column;
 		} else {
 #ifdef HAVE_WIDECHAR
 			if (ctl->fold_long_lines && MB_CUR_MAX > 1) {
@@ -1253,8 +1251,7 @@ static void __attribute__((__format__ (__printf__, 3, 4)))
 		}
 		va_end(argp);
 
-		args = alloca(sizeof(char *) * (argcount + 1));
-		args[argcount] = NULL;
+		args = xcalloc(argcount + 1, sizeof(char *));
 
 		va_start(argp, cmd);
 		arg = va_arg(argp, char *);
@@ -1352,50 +1349,92 @@ static void read_line(struct more_control *ctl)
 	*p = '\0';
 }
 
+/* returns: 0 timeout or nothing; <0 error, >0 success */
 static int more_poll(struct more_control *ctl, int timeout)
 {
-	struct pollfd pfd[2];
+	enum {
+		POLLFD_SIGNAL = 0,
+		POLLFD_STDIN,
+		POLLFD_STDERR,
+	};
+	struct pollfd pfd[] = {
+		[POLLFD_SIGNAL] = { .fd = ctl->sigfd,    .events = POLLIN | POLLERR | POLLHUP },
+		[POLLFD_STDIN]  = { .fd = STDIN_FILENO,  .events = POLLIN | POLLERR | POLLHUP },
+		[POLLFD_STDERR] = { .fd = STDERR_FILENO, .events = POLLIN | POLLERR | POLLHUP }
+	};
+	int has_data = 0;
 
-	pfd[0].fd = ctl->sigfd;
-	pfd[0].events = POLLIN | POLLERR | POLLHUP;
-	pfd[1].fd = STDIN_FILENO;
-	pfd[1].events = POLLIN;
+	while (!has_data) {
+		int rc;
 
-	if (poll(pfd, 2, timeout) < 0) {
-		if (errno == EAGAIN)
-			return 1;
-		more_error(ctl, _("poll failed"));
-		return 1;
-	}
-	if (pfd[0].revents != 0) {
-		struct signalfd_siginfo info;
-		ssize_t sz;
-
-		sz = read(pfd[0].fd, &info, sizeof(info));
-		assert(sz == sizeof(info));
-		switch (info.ssi_signo) {
-		case SIGINT:
-			more_exit(ctl);
-			break;
-		case SIGQUIT:
-			sigquit_handler(ctl);
-			break;
-		case SIGTSTP:
-			sigtstp_handler(ctl);
-			break;
-		case SIGCONT:
-			sigcont_handler(ctl);
-			break;
-		case SIGWINCH:
-			sigwinch_handler(ctl);
-			break;
-		default:
-			abort();
+		if (ctl->ignore_stdin)
+			pfd[POLLFD_STDIN].fd = -1;	/* probably closed, ignore */
+
+		rc = poll(pfd, ARRAY_SIZE(pfd), timeout);
+
+		/* error */
+		if (rc < 0) {
+			if (errno == EAGAIN)
+				continue;
+
+			more_error(ctl, _("poll failed"));
+			return rc;
+		}
+
+		/* timeout */
+		if (rc == 0)
+			return 0;
+
+		/* event on signal FD */
+		if (pfd[POLLFD_SIGNAL].revents) {
+			struct signalfd_siginfo info;
+			ssize_t sz;
+
+			sz = read(pfd[POLLFD_SIGNAL].fd, &info, sizeof(info));
+			assert(sz == sizeof(info));
+			switch (info.ssi_signo) {
+			case SIGINT:
+				more_exit(ctl);
+				break;
+			case SIGQUIT:
+				sigquit_handler(ctl);
+				break;
+			case SIGTSTP:
+				sigtstp_handler(ctl);
+				break;
+			case SIGCONT:
+				sigcont_handler(ctl);
+				break;
+			case SIGWINCH:
+				sigwinch_handler(ctl);
+				break;
+			default:
+				abort();
+			}
 		}
+
+		/* event on stdin */
+		if (pfd[POLLFD_STDIN].revents) {
+			/* Check for POLLERR and POLLHUP in stdin revents */
+			if ((pfd[POLLFD_STDIN].revents & POLLERR) &&
+			    (pfd[POLLFD_STDIN].revents & POLLHUP))
+				more_exit(ctl);
+
+			/* poll() return POLLHUP event after pipe close() and POLLNVAL
+			 * means that fd is already closed. */
+			if ((pfd[POLLFD_STDIN].revents & POLLHUP) ||
+			    (pfd[POLLFD_STDIN].revents & POLLNVAL))
+				ctl->ignore_stdin = 1;
+			else
+				has_data++;
+		}
+
+		/* event on stderr (we reads user commands from stderr!) */
+		if (pfd[POLLFD_STDERR].revents)
+			has_data++;
 	}
-	if (pfd[1].revents == 0)
-		return 1;
-	return 0;
+
+	return has_data;
 }
 
 /* Search for nth occurrence of regular expression contained in buf in
@@ -1463,7 +1502,7 @@ static void search(struct more_control *ctl, char buf[], int n)
 			}
 			break;
 		}
-		more_poll(ctl, 1);
+		more_poll(ctl, 0);
 	}
 	/* Move ctrl+c signal handling back to more_key_command(). */
 	signal(SIGINT, SIG_DFL);
@@ -1627,7 +1666,7 @@ static int more_key_command(struct more_control *ctl, char *filename)
 		ctl->report_errors = 0;
 	ctl->search_called = 0;
 	for (;;) {
-		if (more_poll(ctl, -1) != 0)
+		if (more_poll(ctl, -1) <= 0)
 			continue;
 		cmd = read_command(ctl);
 		if (cmd.key == more_kc_unknown_command)