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/*-------------------------------------------------------------------------
*
* sprompt.c
* simple_prompt() routine
*
* Portions Copyright (c) 1996-2022, 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)
{
return simple_prompt_extended(prompt, echo, NULL);
}
/*
* simple_prompt_extended
*
* This is the same as simple_prompt(), except that prompt_ctx can
* optionally be provided to allow this function to be canceled via an
* existing SIGINT signal handler that will longjmp to the specified place
* only when *(prompt_ctx->enabled) is true. If canceled, this function
* returns an empty string, and prompt_ctx->canceled is set to true.
*/
char *
simple_prompt_extended(const char *prompt, bool echo,
PromptInterruptContext *prompt_ctx)
{
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, prompt_ctx);
/* 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
}
else if (prompt_ctx && prompt_ctx->canceled)
{
/* also echo \n if prompt was canceled */
fputs("\n", termout);
fflush(termout);
}
if (termin != stdin)
{
fclose(termin);
fclose(termout);
}
return result;
}
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