/*
 * KMP_IO.c -- RTL IO
 */


//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//


#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#ifndef __ABSOFT_WIN
# include <sys/types.h>
#endif

#include "kmp_os.h"
#include "kmp_lock.h"
#include "kmp_str.h"
#include "kmp_io.h"
#include "kmp.h" // KMP_GTID_DNE, __kmp_debug_buf, etc

#if KMP_OS_WINDOWS
# pragma warning( push )
# pragma warning( disable: 271 310 )
# include <windows.h>
# pragma warning( pop )
#endif

/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */

kmp_bootstrap_lock_t __kmp_stdio_lock   = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_stdio_lock   ); /* Control stdio functions */
kmp_bootstrap_lock_t __kmp_console_lock = KMP_BOOTSTRAP_LOCK_INITIALIZER( __kmp_console_lock ); /* Control console initialization */

#if KMP_OS_WINDOWS

    # ifdef KMP_DEBUG 
    /* __kmp_stdout is used only for dev build */
    static HANDLE    __kmp_stdout = NULL;
    # endif
    static HANDLE        __kmp_stderr = NULL;
    static int           __kmp_console_exists = FALSE;
    static kmp_str_buf_t __kmp_console_buf;

    static int
    is_console( void )
    {
        char buffer[ 128 ];
        DWORD rc  = 0;
        DWORD err = 0;
        // Try to get console title.
        SetLastError( 0 );
            // GetConsoleTitle does not reset last error in case of success or short buffer,
            // so we need to clear it explicitly.
        rc = GetConsoleTitle( buffer, sizeof( buffer ) );
        if ( rc == 0 ) {
            // rc == 0 means getting console title failed. Let us find out why.
            err = GetLastError();
            // err == 0 means buffer too short (we suppose console exists).
            // In Window applications we usually have err == 6 (invalid handle).
        }; // if
        return rc > 0 || err == 0;
    }

    void
    __kmp_close_console( void )
    {
        /* wait until user presses return before closing window */
        /* TODO only close if a window was opened */
        if( __kmp_console_exists ) {
            #ifdef KMP_DEBUG 
            /* standard out is used only in dev build */
            __kmp_stdout = NULL;
            #endif
            __kmp_stderr = NULL;
            __kmp_str_buf_free( &__kmp_console_buf );
            __kmp_console_exists = FALSE;
        }
    }

    /* For windows, call this before stdout, stderr, or stdin are used.
     * It opens a console window and starts processing */
    static void
    __kmp_redirect_output( void )
    {
        __kmp_acquire_bootstrap_lock( &__kmp_console_lock );

        if( ! __kmp_console_exists ) {
            #ifdef KMP_DEBUG 
            /* standard out is used only in dev build */
            HANDLE ho;
            #endif
            HANDLE he;

            __kmp_str_buf_init( &__kmp_console_buf );

            AllocConsole();
            // We do not check the result of AllocConsole because
            //  1. the call is harmless
            //  2. it is not clear how to communicate failue
            //  3. we will detect failure later when we get handle(s)

            #ifdef KMP_DEBUG
                ho = GetStdHandle( STD_OUTPUT_HANDLE );
                if ( ho == INVALID_HANDLE_VALUE || ho == NULL ) {

                    DWORD  err = GetLastError();
                    // TODO: output error somehow (maybe message box)
                    __kmp_stdout = NULL;

                } else {

                    __kmp_stdout = ho; // temporary code, need new global for ho

                }
            #endif
            he = GetStdHandle( STD_ERROR_HANDLE );
            if ( he == INVALID_HANDLE_VALUE || he == NULL ) {

                DWORD  err = GetLastError();
                // TODO: output error somehow (maybe message box)
                __kmp_stderr = NULL;

            } else {

                __kmp_stderr = he; // temporary code, need new global
            }
            __kmp_console_exists = TRUE;
        }
        __kmp_release_bootstrap_lock( &__kmp_console_lock );
    }

#else
    #define       __kmp_stderr     (stderr)
#endif /* KMP_OS_WINDOWS */

void
__kmp_vprintf( enum kmp_io __kmp_io, char const * format, va_list ap )
{
    #if KMP_OS_WINDOWS
        if( !__kmp_console_exists ) {
            __kmp_redirect_output();
        }
            if( ! __kmp_stderr && __kmp_io == kmp_err ) {
            return;
        }
        #ifdef KMP_DEBUG
            if( ! __kmp_stdout && __kmp_io == kmp_out ) {
                return;
            }
        #endif
    #endif /* KMP_OS_WINDOWS */

    if ( __kmp_debug_buf && __kmp_debug_buffer != NULL ) {

        int dc = ( __kmp_debug_buf_atomic ?
                   KMP_TEST_THEN_INC32( & __kmp_debug_count) : __kmp_debug_count++ )
                   % __kmp_debug_buf_lines;
        char *db = & __kmp_debug_buffer[ dc * __kmp_debug_buf_chars ];
        int chars = 0;

        #ifdef KMP_DEBUG_PIDS
            chars = KMP_SNPRINTF( db, __kmp_debug_buf_chars, "pid=%d: ", (kmp_int32)getpid() );
        #endif
        chars += KMP_VSNPRINTF( db, __kmp_debug_buf_chars, format, ap );

        if ( chars + 1 > __kmp_debug_buf_chars ) {
            if ( chars + 1 > __kmp_debug_buf_warn_chars ) {
                #if KMP_OS_WINDOWS
                    DWORD count;
                    __kmp_str_buf_print( &__kmp_console_buf,
                        "OMP warning: Debugging buffer overflow; increase KMP_DEBUG_BUF_CHARS to %d\n",
                        chars + 1 );
                    WriteFile( __kmp_stderr, __kmp_console_buf.str, __kmp_console_buf.used, &count, NULL );
                    __kmp_str_buf_clear( &__kmp_console_buf );
                #else
                    fprintf( __kmp_stderr,
                         "OMP warning: Debugging buffer overflow; increase KMP_DEBUG_BUF_CHARS to %d\n",
                         chars + 1 );
                    fflush( __kmp_stderr );
                #endif
                __kmp_debug_buf_warn_chars = chars + 1;
            }
            /* terminate string if overflow occurred */
            db[ __kmp_debug_buf_chars - 2 ] = '\n';
            db[ __kmp_debug_buf_chars - 1 ] = '\0';
        }
    } else {
        #if KMP_OS_WINDOWS
            DWORD count;
            #ifdef KMP_DEBUG_PIDS
                __kmp_str_buf_print( &__kmp_console_buf, "pid=%d: ",
                  (kmp_int32)getpid() );
            #endif
            __kmp_str_buf_vprint( &__kmp_console_buf, format, ap );
            WriteFile(
                __kmp_stderr,
                __kmp_console_buf.str,
                __kmp_console_buf.used,
                &count,
                NULL
            );
            __kmp_str_buf_clear( &__kmp_console_buf );
        #else
            #ifdef KMP_DEBUG_PIDS
                fprintf( __kmp_stderr, "pid=%d: ", (kmp_int32)getpid() );
            #endif
            vfprintf( __kmp_stderr, format, ap );
            fflush( __kmp_stderr );
        #endif
    }
}

void
__kmp_printf( char const * format, ... )
{
    va_list ap;
    va_start( ap, format );

    __kmp_acquire_bootstrap_lock( & __kmp_stdio_lock );
    __kmp_vprintf( kmp_err, format, ap );
    __kmp_release_bootstrap_lock( & __kmp_stdio_lock );

    va_end( ap );
}

void
__kmp_printf_no_lock( char const * format, ... )
{
    va_list ap;
    va_start( ap, format );

    __kmp_vprintf( kmp_err, format, ap );

    va_end( ap );
}

/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */