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/*-------------------------------------------------------------------------
*
* sprompt.c
* simple_prompt() routine
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/sprompt.c
*
*-------------------------------------------------------------------------
*/


/*
* simple_prompt
*
* Generalized function especially intended for reading in usernames and
* password interactively. Reads from /dev/tty or stdin/stderr.
*
* prompt: The prompt to print
* maxlen: How many characters to accept
* echo: Set to false if you want to hide what is entered (for passwords)
*
* Returns a malloc()'ed string with the input (w/o trailing newline).
*/
#include "c.h"

#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif

extern char *simple_prompt(const char *prompt, int maxlen, bool echo);

char *
simple_prompt(const char *prompt, int maxlen, bool echo)
{
int length;
char *destination;
FILE *termin,
*termout;

#ifdef HAVE_TERMIOS_H
struct termios t_orig,
t;
#else
#ifdef WIN32
HANDLE t = NULL;
LPDWORD t_orig = NULL;
#endif
#endif

destination = (char *) malloc(maxlen + 1);
if (!destination)
return NULL;

/*
* Do not try to collapse these into one "w+" mode file. Doesn't work on
* some platforms (eg, HPUX 10.20).
*/
termin = fopen(DEVTTY, "r");
termout = fopen(DEVTTY, "w");
if (!termin || !termout
#ifdef WIN32
/* See DEVTTY comment for msys */
|| (getenv("OSTYPE") && strcmp(getenv("OSTYPE"), "msys") == 0)
#endif
)
{
if (termin)
fclose(termin);
if (termout)
fclose(termout);
termin = stdin;
termout = stderr;
}

#ifdef HAVE_TERMIOS_H
if (!echo)
{
tcgetattr(fileno(termin), &t);
t_orig = t;
t.c_lflag &= ~ECHO;
tcsetattr(fileno(termin), TCSAFLUSH, &t);
}
#else
#ifdef WIN32
if (!echo)
{
/* get a new handle to turn echo off */
t_orig = (LPDWORD) malloc(sizeof(DWORD));
t = GetStdHandle(STD_INPUT_HANDLE);

/* save the old configuration first */
GetConsoleMode(t, t_orig);

/* set to the new mode */
SetConsoleMode(t, ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT);
}
#endif
#endif

if (prompt)
{
fputs(_(prompt), termout);
fflush(termout);
}

if (fgets(destination, maxlen + 1, termin) == NULL)
destination[0] = '\0';

length = strlen(destination);
if (length > 0 && destination[length - 1] != '\n')
{
/* eat rest of the line */
char buf[128];
int buflen;

do
{
if (fgets(buf, sizeof(buf), termin) == NULL)
break;
buflen = strlen(buf);
} while (buflen > 0 && buf[buflen - 1] != '\n');
}

if (length > 0 && destination[length - 1] == '\n')
/* remove trailing newline */
destination[length - 1] = '\0';

#ifdef HAVE_TERMIOS_H
if (!echo)
{
tcsetattr(fileno(termin), TCSAFLUSH, &t_orig);
fputs("\n", termout);
fflush(termout);
}
#else
#ifdef WIN32
if (!echo)
{
/* reset to the original console mode */
SetConsoleMode(t, *t_orig);
fputs("\n", termout);
fflush(termout);
free(t_orig);
}
#endif
#endif

if (termin != stdin)
{
fclose(termin);
fclose(termout);
}

return destination;
}
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