Adding upstream version 14.5.upstream/14.5upstream

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

1 files changed, 159 insertions, 0 deletions

diff --git a/src/common/sprompt.c b/src/common/sprompt.c
new file mode 100644
index 0000000..f3a891a
--- /dev/null
+++ b/src/common/sprompt.c
@@ -0,0 +1,159 @@
+/*-------------------------------------------------------------------------
+ *
+ * sprompt.c
+ *	  simple_prompt() routine
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/common/sprompt.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "c.h"
+
+#include "common/fe_memutils.h"
+#include "common/string.h"
+
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+
+
+/*
+ * simple_prompt
+ *
+ * Generalized function especially intended for reading in usernames and
+ * passwords interactively.  Reads from /dev/tty or stdin/stderr.
+ *
+ * prompt:		The prompt to print, or NULL if none (automatically localized)
+ * echo:		Set to false if you want to hide what is entered (for passwords)
+ *
+ * The input (without trailing newline) is returned as a malloc'd string.
+ * Caller is responsible for freeing it when done.
+ */
+char *
+simple_prompt(const char *prompt, bool echo)
+{
+	char	   *result;
+	FILE	   *termin,
+			   *termout;
+#if defined(HAVE_TERMIOS_H)
+	struct termios t_orig,
+				t;
+#elif defined(WIN32)
+	HANDLE		t = NULL;
+	DWORD		t_orig = 0;
+#endif
+
+#ifdef WIN32
+
+	/*
+	 * A Windows console has an "input code page" and an "output code page";
+	 * these usually match each other, but they rarely match the "Windows ANSI
+	 * code page" defined at system boot and expected of "char *" arguments to
+	 * Windows API functions.  The Microsoft CRT write() implementation
+	 * automatically converts text between these code pages when writing to a
+	 * console.  To identify such file descriptors, it calls GetConsoleMode()
+	 * on the underlying HANDLE, which in turn requires GENERIC_READ access on
+	 * the HANDLE.  Opening termout in mode "w+" allows that detection to
+	 * succeed.  Otherwise, write() would not recognize the descriptor as a
+	 * console, and non-ASCII characters would display incorrectly.
+	 *
+	 * XXX fgets() still receives text in the console's input code page.  This
+	 * makes non-ASCII credentials unportable.
+	 *
+	 * Unintuitively, we also open termin in mode "w+", even though we only
+	 * read it; that's needed for SetConsoleMode() to succeed.
+	 */
+	termin = fopen("CONIN$", "w+");
+	termout = fopen("CONOUT$", "w+");
+#else
+
+	/*
+	 * Do not try to collapse these into one "w+" mode file. Doesn't work on
+	 * some platforms (eg, HPUX 10.20).
+	 */
+	termin = fopen("/dev/tty", "r");
+	termout = fopen("/dev/tty", "w");
+#endif
+	if (!termin || !termout
+#ifdef WIN32
+
+	/*
+	 * Direct console I/O does not work from the MSYS 1.0.10 console.  Writes
+	 * reach nowhere user-visible; reads block indefinitely.  XXX This affects
+	 * most Windows terminal environments, including rxvt, mintty, Cygwin
+	 * xterm, Cygwin sshd, and PowerShell ISE.  Switch to a more-generic test.
+	 */
+		|| (getenv("OSTYPE") && strcmp(getenv("OSTYPE"), "msys") == 0)
+#endif
+		)
+	{
+		if (termin)
+			fclose(termin);
+		if (termout)
+			fclose(termout);
+		termin = stdin;
+		termout = stderr;
+	}
+
+	if (!echo)
+	{
+#if defined(HAVE_TERMIOS_H)
+		/* disable echo via tcgetattr/tcsetattr */
+		tcgetattr(fileno(termin), &t);
+		t_orig = t;
+		t.c_lflag &= ~ECHO;
+		tcsetattr(fileno(termin), TCSAFLUSH, &t);
+#elif defined(WIN32)
+		/* need the file's HANDLE to turn echo off */
+		t = (HANDLE) _get_osfhandle(_fileno(termin));
+
+		/* save the old configuration first */
+		GetConsoleMode(t, &t_orig);
+
+		/* set to the new mode */
+		SetConsoleMode(t, ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT);
+#endif
+	}
+
+	if (prompt)
+	{
+		fputs(_(prompt), termout);
+		fflush(termout);
+	}
+
+	result = pg_get_line(termin);
+
+	/* If we failed to read anything, just return an empty string */
+	if (result == NULL)
+		result = pg_strdup("");
+
+	/* strip trailing newline, including \r in case we're on Windows */
+	(void) pg_strip_crlf(result);
+
+	if (!echo)
+	{
+		/* restore previous echo behavior, then echo \n */
+#if defined(HAVE_TERMIOS_H)
+		tcsetattr(fileno(termin), TCSAFLUSH, &t_orig);
+		fputs("\n", termout);
+		fflush(termout);
+#elif defined(WIN32)
+		SetConsoleMode(t, t_orig);
+		fputs("\n", termout);
+		fflush(termout);
+#endif
+	}
+
+	if (termin != stdin)
+	{
+		fclose(termin);
+		fclose(termout);
+	}
+
+	return result;
+}