aboutsummaryrefslogblamecommitdiffstats
path: root/erts/etc/common/erlexec.c
blob: c30203c63266bf38fef72fe544dadf894fbf8390 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990

                   
  
                                                        
  




                                                                      
  



                                                                         
  



























                                                                     
                               






















                                               
                                          











                                                
           






















                                       
           


         
          


             
           
              
           
             









                                     
          
         
         
          
          
          
         
         
         
         

        







                                     





                                     





                                     









                                                        
                                  

                                                    



                                                   












                                      
                               

                                                 





























































                                                                                                  


                                                  
















                                                                           


                                               
                                                                            

                  











                                                      
 




                    


                                       



                         
                                            
                        
                                                         

                                                                   
                        

                        





                                       
















                         
                                                             















































                                                            


























                                                                                         
                   








































































































































                                                                               









                                                        




                                            
                            
                                                                                    









                                                                   
                                                                                               
                                           
                                                                                                  

                            
                                                       


































































































                                                                                     


                                                                        





































                                                                                          
                                                                                 


















































































                                                                               
                           
                           
                           
                           
                           
                           












                                             












                                                    

















































                                                                         













                                                                                














                                                                 














                                                                 









                                                                  













                                                                                

































































                                                                      
                                      













































































































                                                                                     
                                                              

                                                                          

                                                                          
                                                                 


                                                                     
                                                     









                                                                     
                               








                                                                    




















                                   
                                                                              

                         
                                                                                          







                           

                                       


                                          


                                                                          





























































                                                                            
                                                   














































































                                                                       
                                                                            



                                    
                                                                                          
        
                                                                         




























                                                               
                                                                 


                                               
                                                                             


                                 

                                                                      



       
                                                                   
 


                                                                                  
 

                                                      
         

                         


               
                                             

             



                                                                               



                                                                 
                                                                                



                                            
                                                               


                                     
                      

 
                                                     

                                                 


                             









                                                                                               
                                                          





                                                         


                                   

                                                    
 
                              


                                                                              
                 
                       



                                      
                                                                          

             
                                              
             
                  




































































                                                                                   

                                                 











                                                                         

                                                








































































































































































































































































































































































































































                                                                               
 
                                                                    


                             













                                           

















































































































                                                                          














































































































































                                                                            
      
/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 1996-2013. All Rights Reserved.
 *
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * %CopyrightEnd%
 */

/*
 * This is a C version of the erl.exec Bourne shell script, including
 * additions required for Windows NT.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "sys.h"
#include "erl_driver.h"
#include <stdlib.h>
#include <stdarg.h>
#include "erl_misc_utils.h"

#ifdef __WIN32__
#  include "erl_version.h"
#  include "init_file.h"
#endif

#define NO 0
#define YES 1
#define DEFAULT_PROGNAME "erl"

#ifdef __WIN32__
#define INI_FILENAME L"erl.ini"
#define INI_SECTION "erlang"
#define DIRSEP "\\"
#define PATHSEP ";"
#define NULL_DEVICE "nul"
#define BINARY_EXT ""
#define DLL_EXT ".dll"
#define EMULATOR_EXECUTABLE "beam.dll"
#else
#define PATHSEP ":"
#define DIRSEP "/"
#define NULL_DEVICE "/dev/null"
#define BINARY_EXT ""
#define EMULATOR_EXECUTABLE "beam"

#endif
#define QUOTE(s) s

/* +M alloc_util allocators */
static const char plusM_au_allocs[]= {
    'u',	/* all alloc_util allocators */
    'B',	/* binary_alloc		*/
    'D',	/* std_alloc		*/
    'E',	/* ets_alloc		*/
    'F',	/* fix_alloc		*/
    'H',	/* eheap_alloc		*/
    'L',	/* ll_alloc		*/
    'R',	/* driver_alloc		*/
    'S',	/* sl_alloc		*/
    'T',	/* temp_alloc		*/
    '\0'
};

/* +M alloc_util allocator specific arguments */
static char *plusM_au_alloc_switches[] = {
    "as",
    "asbcst",
    "acul",
    "e",
    "t",
    "lmbcs",
    "mbcgs",
    "mbsd",
    "mmbcs",
    "mmmbc",
    "mmsbc",
    "msbclt",
    "ramv",
    "rmbcmt",
    "rsbcmt",
    "rsbcst",
    "sbct",
    "smbcs",
    NULL
};

/* +M other arguments */
static char *plusM_other_switches[] = {
    "ea",
    "ummc",
    "uycs",
    "usac",
    "im",
    "is",
    "it",
    "lpm",
    "Mamcbf",
    "Mrmcbf",
    "Mmcs",
    "Mscs",
    "Mscrfsd",
    "Msco",
    "Mscrpm",
    "Ye",
    "Ym",
    "Ytp",
    "Ytt",
    NULL
};

/* +s arguments with values */
static char *pluss_val_switches[] = {
    "bt",
    "bwt",
    "cl",
    "ct",
    "fwi",
    "tbt",
    "wct",
    "wt",
    "ws",
    "ss",
    "pp",
    NULL
};
/* +h arguments with values */
static char *plush_val_switches[] = {
    "ms",
    "mbs",
    "",
    NULL
};

/* +r arguments with values */
static char *plusr_val_switches[] = {
    "g",
    NULL
};

/* +z arguments with values */
static char *plusz_val_switches[] = {
    "dbbl",
    NULL
};


/*
 * Define sleep(seconds) in terms of Sleep() on Windows.
 */

#ifdef __WIN32__
#define sleep(seconds) Sleep(seconds*1000)
#endif

#define SMP_SUFFIX	  ".smp"
#define DEBUG_SUFFIX      ".debug"
#define EMU_TYPE_SUFFIX_LENGTH  strlen(DEBUG_SUFFIX)

/*
 * Define flags for different memory architectures.
 */
#define EMU_TYPE_SMP		0x0001

#ifdef __WIN32__
#define EMU_TYPE_DEBUG		0x0004
#endif

void usage(const char *switchname);
void start_epmd(char *epmd);
void error(char* format, ...);

/*
 * Local functions.
 */

#if !defined(ERTS_HAVE_SMP_EMU)
static void usage_notsup(const char *switchname);
#endif
static char **build_args_from_env(char *env_var);
static char **build_args_from_string(char *env_var);
static void initial_argv_massage(int *argc, char ***argv);
static void get_parameters(int argc, char** argv);
static void add_arg(char *new_arg);
static void add_args(char *first_arg, ...);
static void ensure_EargsSz(int sz);
static void add_Eargs(char *new_arg);
static void *emalloc(size_t size);
static void *erealloc(void *p, size_t size);
static void efree(void *p);
static char* strsave(char* string);
static int is_one_of_strings(char *str, char *strs[]);
static char *write_str(char *to, char *from);
static void get_home(void);
static void add_epmd_port(void);
#ifdef __WIN32__
static void get_start_erl_data(char *);
static char* get_value(HKEY key, char* value_name, BOOL mustExit);
static char* possibly_quote(char* arg);

/* 
 * Functions from win_erlexec.c
 */
int start_win_emulator(char* emu, char *startprog,char** argv, int start_detached);
int start_emulator(char* emu, char*start_prog, char** argv, int start_detached);
#endif



/*
 * Variables.
 */
int nohup = 0;
int keep_window = 0;

static char **Eargsp = NULL;	/* Emulator arguments (to appear first). */
static int EargsSz = 0;		/* Size of Eargsp */
static int EargsCnt = 0;	/* Number of emulator arguments. */
static char **argsp = NULL;	/* Common arguments. */
static int argsCnt = 0;		/* Number of common arguments */
static int argsSz = 0;		/* Size of argsp */
static char tmpStr[10240];	/* Temporary string buffer. */
static int verbose = 0;		/* If non-zero, print some extra information. */
static int start_detached = 0;	/* If non-zero, the emulator should be
				 * started detached (in the background).
				 */
static int emu_type = 0;	/* If non-zero, start beam.ARCH or beam.ARCH.exe
				 * instead of beam or beam.exe, where ARCH is defined by flags. */
static int emu_type_passed = 0;	/* Types explicitly set */

#ifdef __WIN32__
static char *start_emulator_program = NULL; /* For detachec mode - 
					       erl.exe/werl.exe */
static char* key_val_name = ERLANG_VERSION; /* Used by the registry
					   * access functions.
					   */
static char* boot_script = NULL; /* used by option -start_erl and -boot */
static char* config_script = NULL; /* used by option -start_erl and -config */

static HANDLE this_module_handle;
static int run_werl;
static WCHAR *utf8_to_utf16(unsigned char *bytes);
static char *utf16_to_utf8(WCHAR *wstr);
static WCHAR *latin1_to_utf16(char *str);
#endif

/*
 * Needed parameters to be fetched from the environment (Unix)
 * or the ini file (Win32).
 */

static char* bindir;		/* Location of executables. */
static char* rootdir;		/* Root location of Erlang installation. */
static char* emu;		/* Emulator to run. */
static char* progname;		/* Name of this program. */
static char* home;		/* Path of user's home directory. */

static void
set_env(char *key, char *value)
{
#ifdef __WIN32__
    WCHAR *wkey = latin1_to_utf16(key);
    WCHAR *wvalue = utf8_to_utf16(value);
    if (!SetEnvironmentVariableW(wkey, wvalue))
	error("SetEnvironmentVariable(\"%s\", \"%s\") failed!", key, value);
    efree(wkey);
    efree(wvalue);
#else
    size_t size = strlen(key) + 1 + strlen(value) + 1;
    char *str = emalloc(size);
    sprintf(str, "%s=%s", key, value);
    if (putenv(str) != 0)
	error("putenv(\"%s\") failed!", str);
#ifdef HAVE_COPYING_PUTENV
    efree(str);
#endif
#endif
}


static char *
get_env(char *key)
{
#ifdef __WIN32__
    DWORD size = 32;
    WCHAR *value = NULL;
    WCHAR *wkey = latin1_to_utf16(key);
    char *res;
    while (1) {
	DWORD nsz;
	if (value)
	    efree(value);
	value = emalloc(size*sizeof(WCHAR));
	SetLastError(0);
	nsz = GetEnvironmentVariableW(wkey, value, size);
	if (nsz == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
	    efree(value);
	    efree(wkey);
	    return NULL;
	}
	if (nsz <= size) {
	    efree(wkey);
	    res = utf16_to_utf8(value);
	    efree(value);
	    return res;
	}
	size = nsz;
    }
#else
    return getenv(key);
#endif
}

static void
free_env_val(char *value)
{
#ifdef __WIN32__
    if (value)
	free(value);
#endif
}

/*
 * Add the architecture suffix to the program name if needed,
 * except on Windows, where we insert it just before ".DLL".
 */
static char*
add_extra_suffixes(char *prog, int type)
{
   char *res;
   char *p;
   int len;
#ifdef __WIN32__
   char *dll_p;
   int dll = 0;
#endif

   if (!type) {
       return prog;
   }

   len = strlen(prog);

   /* Worst-case allocation */
   p = emalloc(len +
	       EMU_TYPE_SUFFIX_LENGTH +
	       + 1);
   res = p;
   p = write_str(p, prog);

#ifdef __WIN32__
   dll_p = res + len - 4;
   if (dll_p >= res) {
      if (dll_p[0] == '.' &&
	  (dll_p[1] == 'd' || dll_p[1] == 'D') &&
	  (dll_p[2] == 'l' || dll_p[2] == 'L') &&
	  (dll_p[3] == 'l' || dll_p[3] == 'L')) {
	  p = dll_p;
	  dll = 1;
      }
   }
#endif

#ifdef __WIN32__
   if (type & EMU_TYPE_DEBUG) {
       p = write_str(p, DEBUG_SUFFIX);
       type &= ~(EMU_TYPE_DEBUG);
   }
#endif
   if (type == EMU_TYPE_SMP) {
       p = write_str(p, SMP_SUFFIX);
   }
#ifdef __WIN32__
   if (dll) {
       p = write_str(p, DLL_EXT);
   }
#endif

   return res;
}

#ifdef __WIN32__
__declspec(dllexport) int win_erlexec(int argc, char **argv, HANDLE module, int windowed)
#else
int main(int argc, char **argv)
#endif
{
    int haltAfterwards = 0;	/* If true, put 's erlang halt' at the end
				 * of the arguments. */
    int isdistributed = 0;
    int no_epmd = 0;
    int i;
    char* s;
    char *epmd_prog = NULL;
    char *malloc_lib;
    int process_args = 1;
    int print_args_exit = 0;
    int print_qouted_cmd_exit = 0;
    erts_cpu_info_t *cpuinfo = NULL;
    char* emu_name;

#ifdef __WIN32__
    this_module_handle = module;
    run_werl = windowed;
    /* if we started this erl just to get a detached emulator, 
     * the arguments are already prepared for beam, so we skip
     * directly to start_emulator */
    s = get_env("ERL_CONSOLE_MODE");
    if (s != NULL && strcmp(s, "detached")==0) {
	free_env_val(s);
	s = get_env("ERL_EMULATOR_DLL");
	if (s != NULL) {
	    argv[0] = strsave(s);
	} else {
	    argv[0] = strsave(EMULATOR_EXECUTABLE);
	}
	ensure_EargsSz(argc + 1);
	memcpy((void *) Eargsp, (void *) argv, argc * sizeof(char *));
	Eargsp[argc] = NULL;
	emu = argv[0];
	start_emulator_program = strsave(argv[0]);
	goto skip_arg_massage;
    }   
    free_env_val(s);
#else
    int reset_cerl_detached = 0;

    s = get_env("CERL_DETACHED_PROG");
    if (s && strcmp(s, "") != 0) {
	emu = s;
	start_detached = 1;
	reset_cerl_detached = 1;
	ensure_EargsSz(argc + 1);
	memcpy((void *) Eargsp, (void *) argv, argc * sizeof(char *));
	Eargsp[argc] = emu;
	Eargsp[argc] = NULL;
	goto skip_arg_massage;
    }
    free_env_val(s);
#endif

    initial_argv_massage(&argc, &argv); /* Merge with env; expand -args_file */

    i = 1;
#ifdef __WIN32__
    /* Not used? /rickard */
    if ((argc > 2) && (strcmp(argv[i], "-regkey") == 0)) {
	key_val_name = strsave(argv[i+1]);
	i = 3;
    }
#endif		

    get_parameters(argc, argv);
    
    /*
     * Construct the path of the executable.
     */
    cpuinfo = erts_cpu_info_create();
    /* '-smp auto' is default */ 
#ifdef ERTS_HAVE_SMP_EMU
    if (erts_get_cpu_configured(cpuinfo) > 1)
	emu_type |= EMU_TYPE_SMP;
#endif

#if defined(__WIN32__) && defined(WIN32_ALWAYS_DEBUG)
    emu_type_passed |= EMU_TYPE_DEBUG;
    emu_type |= EMU_TYPE_DEBUG;
#endif

    /* We need to do this before the ordinary processing. */
    malloc_lib = get_env("ERL_MALLOC_LIB");
    while (i < argc) {
	if (argv[i][0] == '+') {
	    if (argv[i][1] == 'M' && argv[i][2] == 'Y' && argv[i][3] == 'm') {
		if (argv[i][4] == '\0') {
		    if (++i < argc)
			malloc_lib = argv[i];
		    else
			usage("+MYm");
		}
		else
		    malloc_lib = &argv[i][4];
	    }
	}
	else if (argv[i][0] == '-') {
	    if (strcmp(argv[i], "-smp") == 0) {
		if (i + 1 >= argc)
		    goto smp;

		if (strcmp(argv[i+1], "auto") == 0) {
		    i++;
		smp_auto:
		    emu_type_passed |= EMU_TYPE_SMP;
#ifdef ERTS_HAVE_SMP_EMU
		    if (erts_get_cpu_configured(cpuinfo) > 1)
			emu_type |= EMU_TYPE_SMP;
		    else
#endif
			emu_type &= ~EMU_TYPE_SMP;
		}
		else if (strcmp(argv[i+1], "enable") == 0) {
		    i++;
		smp_enable:
		    emu_type_passed |= EMU_TYPE_SMP;
#ifdef ERTS_HAVE_SMP_EMU
		    emu_type |= EMU_TYPE_SMP;
#else
		    usage_notsup("-smp enable");
#endif
		}
		else if (strcmp(argv[i+1], "disable") == 0) {
		    i++;
		smp_disable:
		    emu_type_passed |= EMU_TYPE_SMP;
		    emu_type &= ~EMU_TYPE_SMP;
		}
		else {
		smp:

		    emu_type_passed |= EMU_TYPE_SMP;
#ifdef ERTS_HAVE_SMP_EMU
		    emu_type |= EMU_TYPE_SMP;
#else
		    usage_notsup("-smp");
#endif
		}
	    } else if (strcmp(argv[i], "-smpenable") == 0) {
		goto smp_enable;
	    } else if (strcmp(argv[i], "-smpauto") == 0) {
		goto smp_auto;
	    } else if (strcmp(argv[i], "-smpdisable") == 0) {
		goto smp_disable;
#ifdef __WIN32__
	    } else if (strcmp(argv[i], "-debug") == 0) {
		emu_type_passed |= EMU_TYPE_DEBUG;
		emu_type |= EMU_TYPE_DEBUG;
#endif
	    } else if (strcmp(argv[i], "-extra") == 0) {
		break;
	    }
	}
	i++;
    }

    erts_cpu_info_destroy(cpuinfo);
    cpuinfo = NULL;

    if (malloc_lib) {
	if (strcmp(malloc_lib, "libc") != 0)
	    usage("+MYm");
    }
    emu = add_extra_suffixes(emu, emu_type);
    emu_name = strsave(emu);
    erts_snprintf(tmpStr, sizeof(tmpStr), "%s" DIRSEP "%s" BINARY_EXT, bindir, emu);
    emu = strsave(tmpStr);

    add_Eargs(emu);		/* Will be argv[0] -- necessary! */

    /*
     * Add the bindir to the path (unless it is there already).
     */

    s = get_env("PATH");
    if (!s) {
	erts_snprintf(tmpStr, sizeof(tmpStr), "%s" PATHSEP "%s" DIRSEP "bin", bindir, rootdir);
    } else if (strstr(s, bindir) == NULL) {
	erts_snprintf(tmpStr, sizeof(tmpStr), "%s" PATHSEP "%s" DIRSEP "bin" PATHSEP "%s", bindir,
		rootdir, s);
    } else {
	erts_snprintf(tmpStr, sizeof(tmpStr), "%s", s);
    }
    free_env_val(s);
    set_env("PATH", tmpStr);
    
    i = 1;

#ifdef __WIN32__
#define ADD_BOOT_CONFIG					\
    if (boot_script)					\
	add_args("-boot", boot_script, NULL);		\
    if (config_script)					\
	add_args("-config", config_script, NULL);
#else
#define ADD_BOOT_CONFIG
#endif

    get_home();
    add_args("-home", home, NULL);

    add_epmd_port();

    add_arg("--");

    while (i < argc) {
	if (!process_args) {	/* Copy arguments after '-extra' */
	    add_arg(argv[i]);
	    i++;
	} else {
	    switch (argv[i][0]) {
	      case '-':
		switch (argv[i][1]) {
#ifdef __WIN32__
		case 'b':
		    if (strcmp(argv[i], "-boot") == 0) {
			if (boot_script)
			    error("Conflicting -start_erl and -boot options");
			if (i+1 >= argc)
			    usage("-boot");
			boot_script = strsave(argv[i+1]);
			i++;
		    }
		    else {
			add_arg(argv[i]);
		    }
		    break;
#endif
		case 'c':
		    if (strcmp(argv[i], "-compile") == 0) {
			/*
			 * Note that the shell script erl.exec does an recursive call
			 * on itself here.  We'll avoid doing that.
			 */
			add_args("-noshell", "-noinput", "-s", "c", "lc_batch",
				 NULL);
			add_Eargs("-B");
			haltAfterwards = 0;
		    }
#ifdef __WIN32__
		    else if (strcmp(argv[i], "-config") == 0){
			if (config_script)
			    error("Conflicting -start_erl and -config options");
			if (i+1 >= argc)
			    usage("-config");
			config_script = strsave(argv[i+1]);
			i++;
		    }
#endif
		    else {
			add_arg(argv[i]);
		    }
		    break;

		  case 'd':
		    if (strcmp(argv[i], "-detached") != 0) {
			add_arg(argv[i]);
		    } else {
			start_detached = 1;
			add_args("-noshell", "-noinput", NULL);
		    }
		    break;

		  case 'i':
		    if (strcmp(argv[i], "-instr") == 0) {
			add_Eargs("-Mim");
			add_Eargs("true");
		    }
		    else
			add_arg(argv[i]);
		    break;

		  case 'e':
		    if (strcmp(argv[i], "-extra") == 0) {
			process_args = 0;
			ADD_BOOT_CONFIG;
			add_arg(argv[i]);
		    } else if (strcmp(argv[i], "-emu_args") == 0) { /* -emu_args */
			verbose = 1;
		    } else if (strcmp(argv[i], "-emu_args_exit") == 0) {
			print_args_exit = 1;
		    } else if (strcmp(argv[i], "-emu_name_exit") == 0) {
			printf("%s\n", emu_name);
			exit(0);
		    } else if (strcmp(argv[i], "-emu_qouted_cmd_exit") == 0) {
			print_qouted_cmd_exit = 1;
		    } else if (strcmp(argv[i], "-env") == 0) { /* -env VARNAME VARVALUE */
			if (i+2 >= argc)
			    usage("-env");
			set_env(argv[i+1], argv[i+2]);
			i += 2;
		    } else if (strcmp(argv[i], "-epmd") == 0) { 
			if (i+1 >= argc)
			    usage("-epmd");
			epmd_prog = argv[i+1];
			++i;
		    } else {
			add_arg(argv[i]);
		    }
		    break;
		  case 'k':
		    if (strcmp(argv[i], "-keep_window") == 0) {
			keep_window = 1;
		    } else
			add_arg(argv[i]);
		    break;

		  case 'm':
		    /*
		     * Note that the shell script erl.exec does an recursive call
		     * on itself here.  We'll avoid doing that.
		     */
		    if (strcmp(argv[i], "-make") == 0) {
			add_args("-noshell", "-noinput", "-s", "make", "all", NULL);
			add_Eargs("-B");
			haltAfterwards = 1;
			i = argc; /* Skip rest of command line */
		    } else if (strcmp(argv[i], "-man") == 0) {
#if defined(__WIN32__)
			error("-man not supported on Windows");
#else
			argv[i] = "man";
			erts_snprintf(tmpStr, sizeof(tmpStr), "%s/man", rootdir);
			set_env("MANPATH", tmpStr);
			execvp("man", argv+i);
			error("Could not execute the 'man' command.");
#endif
		    } else
			add_arg(argv[i]);
		    break;

		  case 'n':
		    if (strcmp(argv[i], "-name") == 0) { /* -name NAME */
			if (i+1 >= argc)
			    usage("-name");
		    
			/*
			 * Note: Cannot use add_args() here, due to non-defined
			 * evaluation order.
			 */

			add_arg(argv[i]);
			add_arg(argv[i+1]);
			isdistributed = 1;
			i++;
		    } else if (strcmp(argv[i], "-noinput") == 0) {
			add_args("-noshell", "-noinput", NULL);
		    } else if (strcmp(argv[i], "-nohup") == 0) {
			add_arg("-nohup");
			nohup = 1;
		    } else if (strcmp(argv[i], "-no_epmd") == 0) {
			add_arg("-no_epmd");
			no_epmd = 1;
		    } else {
			add_arg(argv[i]);
		    }
		    break;

		  case 's':	/* -sname NAME */
		    if (strcmp(argv[i], "-sname") == 0) {
			if (i+1 >= argc)
			    usage("-sname");
			add_arg(argv[i]);
			add_arg(argv[i+1]);
			isdistributed = 1;
			i++;
		    }
#ifdef __WIN32__
		    else if (strcmp(argv[i], "-service_event") == 0) {
			add_arg(argv[i]);
			add_arg(argv[i+1]);
			i++;
		    }		    
		    else if (strcmp(argv[i], "-start_erl") == 0) {
			if (i+1 < argc && argv[i+1][0] != '-') {
			    get_start_erl_data(argv[i+1]);
			    i++;
			} else
			    get_start_erl_data((char *) NULL);
		    }
#endif
		    else
			add_arg(argv[i]);
		
		    break;
	
		  case 'v':	/* -version */
		    if (strcmp(argv[i], "-version") == 0) {
			add_Eargs("-V");
		    } else {
			add_arg(argv[i]);
		    }
		    break;

		  default:
		    add_arg(argv[i]);
		    break;
		} /* switch(argv[i][1] */
		break;

	      case '+':
		switch (argv[i][1]) {
		  case '#':
		  case 'a':
		  case 'A':
		  case 'b':
		  case 'e':
		  case 'i':
		  case 'n':
		  case 'P':
		  case 'Q':
		  case 't':
		  case 'T':
		  case 'R':
		  case 'W':
		  case 'K':
		      if (argv[i][2] != '\0')
			  goto the_default;
		      if (i+1 >= argc)
			  usage(argv[i]);
		      argv[i][0] = '-';
		      add_Eargs(argv[i]);
		      add_Eargs(argv[i+1]);
		      i++;
		      break;
		  case 'S':
		      if (argv[i][2] == 'P') {
			  if (argv[i][3] != '\0')
			      goto the_default;
		      } else if (argv[i][2] != '\0')
			  goto the_default;
		      if (i+1 >= argc)
			  usage(argv[i]);
		      argv[i][0] = '-';
		      add_Eargs(argv[i]);
		      add_Eargs(argv[i+1]);
		      i++;
		      break;
		  case 'B':
		      argv[i][0] = '-';
		      if (argv[i][2] != '\0') {
			  if ((argv[i][2] != 'i') &&
			      (argv[i][2] != 'c') &&
			      (argv[i][2] != 'd')) { 
			  usage(argv[i]);
			} else {
			  add_Eargs(argv[i]);
			  break;
			}
		      }
		      if (i+1 < argc) {
			if ((argv[i+1][0] != '-') &&
			    (argv[i+1][0] != '+')) {
			  if (argv[i+1][0] == 'i') {
			    add_Eargs(argv[i]);
			    add_Eargs(argv[i+1]);
			    i++;
			    break;
			  } else {
			    usage(argv[i]);
			  }
			}
		      }
		      add_Eargs(argv[i]);
		      break;
		  case 'M': {
		      int x;
		      for (x = 0; plusM_au_allocs[x]; x++)
			  if (plusM_au_allocs[x] == argv[i][2])
			      break;
		      if ((plusM_au_allocs[x]
			   && is_one_of_strings(&argv[i][3],
						plusM_au_alloc_switches))
			  || is_one_of_strings(&argv[i][2],
					       plusM_other_switches)) {
			  if (i+1 >= argc
			      || argv[i+1][0] == '-'
			      || argv[i+1][0] == '+')
			      usage(argv[i]);
			  argv[i][0] = '-';
			  add_Eargs(argv[i]);
			  add_Eargs(argv[i+1]);
			  i++;
		      }
		      else
			  goto the_default;
		      break;
		  }
		  case 'h':
		      if (!is_one_of_strings(&argv[i][2], plush_val_switches)) {
			  goto the_default;
		      } else {
			  if (i+1 >= argc
			      || argv[i+1][0] == '-'
			      || argv[i+1][0] == '+')
			      usage(argv[i]);
			  argv[i][0] = '-';
			  add_Eargs(argv[i]);
			  add_Eargs(argv[i+1]);
			  i++;
		      }
		      break;
		  case 'r':
		      if (!is_one_of_strings(&argv[i][2],
					     plusr_val_switches))
			  goto the_default;
		      else {
			  if (i+1 >= argc
			      || argv[i+1][0] == '-'
			      || argv[i+1][0] == '+')
			      usage(argv[i]);
			  argv[i][0] = '-';
			  add_Eargs(argv[i]);
			  add_Eargs(argv[i+1]);
			  i++;
		      }
		      break;
		  case 's':
		      if (!is_one_of_strings(&argv[i][2],
					     pluss_val_switches))
			  goto the_default;
		      else {
			  if (i+1 >= argc
			      || argv[i+1][0] == '-'
			      || argv[i+1][0] == '+')
			      usage(argv[i]);
			  argv[i][0] = '-';
			  add_Eargs(argv[i]);
			  add_Eargs(argv[i+1]);
			  i++;
		      }
		      break;
		  case 'p':
		      if (argv[i][2] != 'c' || argv[i][3] != '\0')
			  goto the_default;
		      if (i+1 >= argc)
			  usage(argv[i]);
		      argv[i][0] = '-';
		      add_Eargs(argv[i]);
		      add_Eargs(argv[i+1]);
		      i++;
		      break;
		  case 'z':
		      if (!is_one_of_strings(&argv[i][2], plusz_val_switches)) {
			  goto the_default;
		      } else {
			  if (i+1 >= argc
			      || argv[i+1][0] == '-'
			      || argv[i+1][0] == '+')
			      usage(argv[i]);
			  argv[i][0] = '-';
			  add_Eargs(argv[i]);
			  add_Eargs(argv[i+1]);
			  i++;
		      }
		      break;
		  default:
		  the_default:
		    argv[i][0] = '-'; /* Change +option to -option. */
		    add_Eargs(argv[i]);
		}
		break;
      
	      default:
		add_arg(argv[i]);
	    } /* switch(argv[i][0] */
	    i++;
	}
    }

    if (process_args) {
	ADD_BOOT_CONFIG;
    }
#undef ADD_BOOT_CONFIG

    /* Doesn't conflict with -extra, since -make skips all the rest of
       the arguments. */
    if (haltAfterwards) {
	add_args("-s", "erlang", "halt", NULL);
    }
    
    if (isdistributed && !no_epmd)
	start_epmd(epmd_prog);

#if (! defined(__WIN32__)) && defined(DEBUG)
    if (start_detached) {
	/* Start the emulator within an xterm.
	 * Move up all arguments and insert
	 * "xterm -e " first.
	 * The path must be searched for this 
	 * to work, i.e execvp() must be used. 
	 */
	ensure_EargsSz(EargsCnt+2);
	for (i = EargsCnt; i > 0; i--)
	    Eargsp[i+1] = Eargsp[i-1]; /* Two args to insert */
	EargsCnt += 2; /* Two args to insert */
	Eargsp[0] = emu = "xterm";
	Eargsp[1] = "-e";
    }    
#endif
    
    add_Eargs("--");
    add_Eargs("-root");
    add_Eargs(rootdir);
    add_Eargs("-progname");
    add_Eargs(progname);
    add_Eargs("--");
    ensure_EargsSz(EargsCnt + argsCnt + 1);
    for (i = 0; i < argsCnt; i++)
	Eargsp[EargsCnt++] = argsp[i];
    Eargsp[EargsCnt] = NULL;
    
    if (print_qouted_cmd_exit) {
	printf("\"%s\" ", emu);
	for (i = 1; i < EargsCnt; i++)
	    printf("\"%s\" ", Eargsp[i]);
	printf("\n");
	exit(0);
    }

    if (print_args_exit) {
	for (i = 1; i < EargsCnt; i++)
	    printf("%s\n", Eargsp[i]);
	exit(0);
    }

    if (verbose) {
	printf("Executing: %s", emu);
	for (i = 0; i < EargsCnt; i++)
	    printf(" %s", Eargsp[i]);
	printf("\n\n");
    }

#ifdef __WIN32__

    if (EargsSz != EargsCnt + 1)
	Eargsp = (char **) erealloc((void *) Eargsp, (EargsCnt + 1) * 
				    sizeof(char *));
    efree((void *) argsp);

 skip_arg_massage:
    /*DebugBreak();*/

    if (run_werl) {
	if (start_detached) {
	    char *p;
	    /* transform werl to erl */
	    p = start_emulator_program+strlen(start_emulator_program);
	    while (--p >= start_emulator_program && *p != '/' && *p != '\\' &&
		   *p != 'W' && *p != 'w')
		;
	    if (p >= start_emulator_program && (*p == 'W' || *p == 'w') &&
		(p[1] == 'E' || p[1] == 'e') && (p[2] == 'R' || p[2] == 'r') &&
		(p[3] == 'L' || p[3] == 'l')) {
		memmove(p,p+1,strlen(p));
	    }
	}
      return start_win_emulator(emu, start_emulator_program, Eargsp, start_detached);
    } else {
      return start_emulator(emu, start_emulator_program, Eargsp, start_detached);
    }

#else

 skip_arg_massage:
    if (start_detached) {
	int status = fork();
	if (status != 0)	/* Parent */
	    return 0;

	if (reset_cerl_detached)
	    putenv("CERL_DETACHED_PROG=");

	/* Detach from controlling terminal */
#ifdef HAVE_SETSID
	setsid();
#elif defined(TIOCNOTTY)
	{
	  int fd = open("/dev/tty", O_RDWR);
	  if (fd >= 0) {
	    ioctl(fd, TIOCNOTTY, NULL);
	    close(fd);
	  }
	}
#endif

	status = fork();
	if (status != 0)	/* Parent */
	    return 0;

	/*
	 * Grandchild.
	 */
	close(0);
	open("/dev/null", O_RDONLY);
	close(1);
	open("/dev/null", O_WRONLY);
	close(2);
	open("/dev/null", O_WRONLY);
#ifdef DEBUG
	execvp(emu, Eargsp); /* "xterm ..." needs to search the path */
#endif
    } 
#ifdef DEBUG
    else
#endif
    {
	execv(emu, Eargsp);
    }
    error("Error %d executing \'%s\'.", errno, emu);
    return 1;
#endif
}


static void
usage_aux(void)
{
  fprintf(stderr,
	  "Usage: erl [-version] [-sname NAME | -name NAME] "
	  "[-noshell] [-noinput] [-env VAR VALUE] [-compile file ...] "
#ifdef __WIN32__
	  "[-start_erl [datafile]] "
#endif
	  "[-smp "
#ifdef ERTS_HAVE_SMP_EMU
	  "[enable|"
#endif
	  "auto|disable"
#ifdef ERTS_HAVE_SMP_EMU
	  "]"
#endif
	  "] "
	  "[-make] [-man [manopts] MANPAGE] [-x] [-emu_args] "
	  "[-args_file FILENAME] [+A THREADS] [+a SIZE] [+B[c|d|i]] [+c] "
	  "[+h HEAP_SIZE_OPTION] [+K BOOLEAN] "
	  "[+l] [+M<SUBSWITCH> <ARGUMENT>] [+P MAX_PROCS] [+Q MAX_PORTS] "
	  "[+R COMPAT_REL] "
	  "[+r] [+rg READER_GROUPS_LIMIT] [+s SCHEDULER_OPTION] "
	  "[+S NO_SCHEDULERS:NO_SCHEDULERS_ONLINE] "
	  "[+SP PERCENTAGE_SCHEDULERS:PERCENTAGE_SCHEDULERS_ONLINE] "
	  "[+T LEVEL] [+V] [+v] "
	  "[+W<i|w>] [+z MISC_OPTION] [args ...]\n");
  exit(1);
}

void
usage(const char *switchname)
{
    fprintf(stderr, "Missing argument(s) for \'%s\'.\n", switchname);
    usage_aux();
}

#if !defined(ERTS_HAVE_SMP_EMU)
static void
usage_notsup(const char *switchname)
{
    fprintf(stderr, "Argument \'%s\' not supported.\n", switchname);
    usage_aux();
}
#endif

static void
usage_format(char *format, ...)
{
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
    usage_aux();
}

void
start_epmd(char *epmd)
{
    char  epmd_cmd[MAXPATHLEN+100];
#ifdef __WIN32__
    char* arg1 = NULL;
#endif
    int   result;

    if (!epmd) {
	epmd = epmd_cmd;
#ifdef __WIN32__
	erts_snprintf(epmd_cmd, sizeof(epmd_cmd), "%s" DIRSEP "epmd", bindir);
	arg1 = "-daemon";
#else
	erts_snprintf(epmd_cmd, sizeof(epmd_cmd), "\"%s" DIRSEP "epmd\" -daemon", bindir);
#endif
    } 
#ifdef __WIN32__
    if (arg1 != NULL) {
	strcat(epmd, " ");
	strcat(epmd, arg1);
    }
    {
	wchar_t wcepmd[MAXPATHLEN+100];
	STARTUPINFOW start;
	PROCESS_INFORMATION pi;
	memset(&start, 0, sizeof (start));
	start.cb = sizeof (start);
	MultiByteToWideChar(CP_UTF8, 0, epmd, -1, wcepmd, MAXPATHLEN+100);

	if (!CreateProcessW(NULL, wcepmd, NULL, NULL, FALSE, 
			       CREATE_DEFAULT_ERROR_MODE | DETACHED_PROCESS,
			       NULL, NULL, &start, &pi))
	    result = -1;
	else
	    result = 0;
    }
#else
    result = system(epmd);
#endif
    if (result == -1) {
      fprintf(stderr, "Error spawning %s (error %d)\n", epmd_cmd,errno);
      exit(1);
    }
}

static void
add_arg(char *new_arg)
{
    if (argsCnt >= argsSz)
	argsp = (char **) erealloc((void *) argsp,
				   sizeof(char *) * (argsSz += 20));
    argsp[argsCnt++] = QUOTE(new_arg);
}

static void
add_args(char *first_arg, ...)
{
    va_list ap;
    char* arg;
    
    add_arg(first_arg);
    va_start(ap, first_arg);
    while ((arg = va_arg(ap, char *)) != NULL) {
	add_arg(arg);
    }
    va_end(ap);
}

static void
ensure_EargsSz(int sz)
{
    if (EargsSz < sz)
	Eargsp = (char **) erealloc((void *) Eargsp,
				    sizeof(char *) * (EargsSz = sz));
}

static void
add_Eargs(char *new_arg)
{
    if (EargsCnt >= EargsSz)
	Eargsp = (char **) erealloc((void *) Eargsp,
				    sizeof(char *) * (EargsSz += 20));
    Eargsp[EargsCnt++] = QUOTE(new_arg);
}

#if !defined(__WIN32__)
void error(char* format, ...)
{
    char sbuf[1024];
    va_list ap;

    va_start(ap, format);
    erts_vsnprintf(sbuf, sizeof(sbuf), format, ap);
    va_end(ap);
    fprintf(stderr, "erlexec: %s\n", sbuf);
    exit(1);
}
#endif

static void *
emalloc(size_t size)
{
    void *p = malloc(size);
    if (p == NULL)
	error("Insufficient memory");
    return p;
}

static void *
erealloc(void *p, size_t size)
{
    void *res = realloc(p, size);
    if (res == NULL)
	error("Insufficient memory");
    return res;
}

static void
efree(void *p) 
{
    free(p);
}

static int
is_one_of_strings(char *str, char *strs[])
{
    int i, j;
    for (i = 0; strs[i]; i++) {
	for (j = 0; str[j] && strs[i][j] && str[j] == strs[i][j]; j++);
	if (!str[j] && !strs[i][j])
	    return 1;
    }
    return 0;
}

static char *write_str(char *to, char *from)
{
    while (*from)
	*(to++) = *(from++);
    *to = '\0';
    return to;
}

char*
strsave(char* string)
{
    char* p = emalloc(strlen(string)+1);
    strcpy(p, string);
    return p;
}


#if defined(__WIN32__)

static void get_start_erl_data(char *file)
{
    int fp;
    char tmpbuffer[512];
    char start_erl_data[512];
    int bytesread;
    char* env;
    char* reldir;
    char* otpstring;
    char* tprogname;
    if (boot_script) 
	error("Conflicting -start_erl and -boot options");
    if (config_script)
	error("Conflicting -start_erl and -config options");
    env = get_env("RELDIR");
    if (env)
	reldir = strsave(env);
    else {
	erts_snprintf(tmpbuffer, sizeof(tmpbuffer), "%s/releases", rootdir);
	reldir = strsave(tmpbuffer);
    }
    free_env_val(env);
    if (file == NULL)
       erts_snprintf(start_erl_data, sizeof(start_erl_data), "%s/start_erl.data", reldir);
    else
       erts_snprintf(start_erl_data, sizeof(start_erl_data), "%s", file);
    fp = _open(start_erl_data, _O_RDONLY );
    if( fp == -1 )
	error( "open failed on %s",start_erl_data );
    else {
	if( ( bytesread = _read( fp, tmpbuffer, 512 ) ) <= 0 )
	    error( "Problem reading file %s", start_erl_data );
	else {
	    tmpbuffer[bytesread]='\0';
	    if ((otpstring = strchr(tmpbuffer,' ')) != NULL) {
		*otpstring = '\0';
		otpstring++;
		
/*
 *   otpstring is the otpversion
 *   tmpbuffer is the emuversion
*/
	    }
	}
    }
    tprogname = otpstring;
    while (*tprogname) {
	if (*tprogname <= ' ') {
	    *tprogname='\0';
	    break;
	}
	tprogname++;
    }
	
    bindir = emalloc(512);
    erts_snprintf(bindir,512,"%s/erts-%s/bin",rootdir,tmpbuffer);
    /* BINDIR=$ROOTDIR/erts-$ERTS_VSN/bin */
    tprogname = progname;
    progname = emalloc(strlen(tprogname) + 20);
    erts_snprintf(progname,strlen(tprogname) + 20,"%s -start_erl",tprogname);

    boot_script = emalloc(512);
    config_script = emalloc(512);
    erts_snprintf(boot_script, 512, "%s/%s/start", reldir, otpstring);
    erts_snprintf(config_script, 512, "%s/%s/sys", reldir, otpstring);
       
}


static wchar_t *replace_filename(wchar_t *path, wchar_t *new_base) 
{
    int plen = wcslen(path);
    wchar_t *res = (wchar_t *) emalloc((plen+wcslen(new_base)+1)*sizeof(wchar_t));
    wchar_t *p;

    wcscpy(res,path);
    for (p = res+plen-1 ;p >= res && *p != L'\\'; --p)
        ;
    *(p+1) =L'\0';
    wcscat(res,new_base);
    return res;
}

static char *path_massage(wchar_t *long_path)
{
     char *p;
     int len;
     len = WideCharToMultiByte(CP_UTF8, 0, long_path, -1, NULL, 0, NULL, NULL);
     p = emalloc(len*sizeof(char));
     WideCharToMultiByte(CP_UTF8, 0, long_path, -1, p, len, NULL, NULL);
     return p;
}
    
static char *do_lookup_in_section(InitSection *inis, char *name, 
				  char *section, wchar_t *filename, int is_path)
{
    char *p = lookup_init_entry(inis, name);

    if (p == NULL) {
	error("Could not find key %s in section %s of file %S",
	      name,section,filename);
    }

    return strsave(p);
}

// Setup bindir, rootdir and progname as utf8 buffers
static void get_parameters(int argc, char** argv)
{
    wchar_t *p;
    wchar_t buffer[MAX_PATH];
    wchar_t *ini_filename;
    HANDLE module = GetModuleHandle(NULL); /* This might look strange, but we want the erl.ini 
					      that resides in the same dir as erl.exe, not 
					      an erl.ini in our directory */
    InitFile *inif;
    InitSection *inis;

    if (module == NULL) {
        error("Cannot GetModuleHandle()");
    }

    if (GetModuleFileNameW(module,buffer,MAX_PATH) == 0) {
        error("Could not GetModuleFileName");
    }

    ini_filename = replace_filename(buffer,INI_FILENAME);

    if ((inif = load_init_file(ini_filename)) == NULL) {
	wchar_t wbindir[MAX_PATH];
	wchar_t wrootdir[MAX_PATH];

	/* Assume that the path is absolute and that
	   it does not contain any symbolic link */

	/* Determine bindir */
	if (GetEnvironmentVariableW(L"ERLEXEC_DIR", buffer, MAX_PATH) == 0) {
	    wcscpy(buffer, ini_filename);
	    for (p = buffer+wcslen(buffer)-1; p >= buffer && *p != L'\\'; --p)
		;
	    *p = L'\0';
	}
	bindir = path_massage(buffer);

	/* Determine rootdir */
	for (p = buffer+wcslen(buffer)-1; p >= buffer && *p != L'\\'; --p)
	    ;
	p--;
	for (;p >= buffer && *p != L'\\'; --p)
	    ;
	*p =L'\0';
	rootdir = path_massage(buffer);

	/* Hardcoded progname */
	progname = strsave(DEFAULT_PROGNAME);
    } else {
	if ((inis = lookup_init_section(inif,INI_SECTION)) == NULL) {
	    error("Could not find section %s in init file %s",
		  INI_SECTION, ini_filename);
	}

	bindir = do_lookup_in_section(inis, "Bindir", INI_SECTION, ini_filename,1);
	rootdir = do_lookup_in_section(inis, "Rootdir", INI_SECTION, 
				       ini_filename,1);
	progname = do_lookup_in_section(inis, "Progname", INI_SECTION, 
					ini_filename,0);
	free_init_file(inif);
    }

    emu = EMULATOR_EXECUTABLE;
    start_emulator_program = strsave(argv[0]);

    free(ini_filename);
}

static void
get_home(void)
{
    int len;
    char tmpstr[MAX_PATH+1];
    char* homedrive;
    char* homepath;

    homedrive = get_env("HOMEDRIVE");
    homepath = get_env("HOMEPATH");
    if (!homedrive || !homepath) {
	if (len = GetWindowsDirectory(tmpstr,MAX_PATH)) {
	    home = emalloc(len+1);
	    strcpy(home,tmpstr);
	} else
	    error("HOMEDRIVE or HOMEPATH is not set and GetWindowsDir failed");
    } else {
	home = emalloc(strlen(homedrive)+strlen(homepath)+1);
	strcpy(home, homedrive);
	strcat(home, homepath);
    }
    free_env_val(homedrive);
    free_env_val(homepath);
}

#else

static void
get_parameters(int argc, char** argv)
{
    progname = get_env("PROGNAME");
    if (!progname) {
	progname = strsave(DEFAULT_PROGNAME);
    }	

    emu = get_env("EMU");
    if (!emu) {
	emu = strsave(EMULATOR_EXECUTABLE);
    }	

    bindir = get_env("BINDIR");
    if (!bindir) {
	/* Determine bindir from absolute path to executable */
	char *p;
	char buffer[PATH_MAX];
	strncpy(buffer, argv[0], sizeof(buffer));
	buffer[sizeof(buffer)-1] = '\0';
	
	for (p = buffer+strlen(buffer)-1 ; p >= buffer && *p != '/'; --p)
	    ;
	*p ='\0';
	bindir = strsave(buffer);
    }

    rootdir = get_env("ROOTDIR");
    if (!rootdir) {
	/* Determine rootdir from absolute path to bindir */
	char *p;
	char buffer[PATH_MAX];
	strncpy(buffer, bindir, sizeof(buffer));
	buffer[sizeof(buffer)-1] = '\0';
	
	for (p = buffer+strlen(buffer)-1; p >= buffer && *p != '/'; --p)
	    ;
	p--;
	for (; p >= buffer && *p != '/'; --p)
	    ;
	*p ='\0';
	rootdir = strsave(buffer);
    }

    if (!progname || !emu || !rootdir || !bindir) {
	error("PROGNAME, EMU, ROOTDIR and BINDIR  must be set");
    }
}

static void
get_home(void)
{
    home = get_env("HOME");
    if (home == NULL)
	error("HOME must be set");
}

#endif

static void add_epmd_port(void)
{
    char* port = get_env("ERL_EPMD_PORT");
    if (port != NULL) {
	add_args("-epmd_port", port, NULL);	
    }
}

static char **build_args_from_env(char *env_var)
{
    char *value = get_env(env_var);
    char **res = build_args_from_string(value);
    free_env_val(value);
    return res;
}

static char **build_args_from_string(char *string)
{
    int argc = 0;
    char **argv = NULL;
    int alloced = 0;
    char **cur_s = NULL;	/* Initialized to avoid warning. */
    int s_alloced = 0;
    int s_pos = 0;
    char *p = string;
    enum {Start, Build, Build0, BuildSQuoted, BuildDQuoted, AcceptNext} state;

#define ENSURE()					\
    if (s_pos >= s_alloced) {			        \
	if (!*cur_s) {					\
	    *cur_s = emalloc(s_alloced = 20);		\
	} else {					\
	    *cur_s = erealloc(*cur_s, s_alloced += 20);	\
	}						\
    }


    if (!p)
	return NULL;
    argv = emalloc(sizeof(char *) * (alloced = 10));
    state = Start;
    for(;;) {
	switch (state) {
	case Start:
	    if (!*p) 
		goto done;
	    if (argc >= alloced - 1) { /* Make room for extra NULL */
		argv = erealloc(argv, (alloced += 10) * sizeof(char *));
	    }
	    cur_s = argc + argv;
	    *cur_s = NULL;
	    s_pos = 0;
	    s_alloced = 0;
	    state = Build0;
	    break;
	case Build0:
	    switch (*p) {
	    case ' ':
		++p;
		break;
	    case '\0':
		state = Start;
		break;
	    default:
		state = Build;
		break;
	    }
	    break;
	case Build:
	    switch (*p) {
	    case ' ':
	    case '\0':
		ENSURE();
		(*cur_s)[s_pos] = '\0';
		++argc;
		state = Start;
		break;
	    case '"':
		++p;
		state = BuildDQuoted;
		break;
	    case '\'':
		++p;
		state = BuildSQuoted;
		break;
	    case '\\':
		++p;
		state = AcceptNext;
		break;
	    default:
		ENSURE();
		(*cur_s)[s_pos++] = *p++;
		break;
	    }
	    break;
	case BuildDQuoted:
	    switch (*p) {
	    case '"':
		++p;
		/* fall through */
	    case '\0':
		state = Build;
		break;
	    default:
		ENSURE();
		(*cur_s)[s_pos++] = *p++;
		break;
	    }
	    break;
	case BuildSQuoted:
	    switch (*p) {
	    case '\'':
		++p;
		/* fall through */
	    case '\0':
		state = Build;
		break;
	    default:
		ENSURE();
		(*cur_s)[s_pos++] = *p++;
		break;
	    }
	    break;
	case AcceptNext:
	    if (!*p) {
		state = Build;
	    } else {
		ENSURE();
		(*cur_s)[s_pos++] = *p++;
	    }
	    state = Build;
	    break;
	}
    }
done:
    argv[argc] = NULL; /* Sure to be large enough */
    if (!argc) {
	efree(argv);
	return NULL;
    }
    return argv;
#undef ENSURE
}

static char *
errno_string(void)
{
    char *str = strerror(errno);
    if (!str)
	return "unknown error";
    return str;
}

static char **
read_args_file(char *filename)
{
    int c, aix = 0, quote = 0, cmnt = 0, asize = 0;
    char **res, *astr = NULL;
    FILE *file;

#undef EAF_CMNT
#undef EAF_QUOTE
#undef SAVE_CHAR

#define EAF_CMNT	(1 << 8)
#define EAF_QUOTE	(1 << 9)
#define SAVE_CHAR(C)						\
    do {							\
	if (!astr)						\
	    astr = emalloc(sizeof(char)*(asize = 20));		\
	if (aix == asize)					\
	    astr = erealloc(astr, sizeof(char)*(asize += 20));	\
	if (' ' != (char) (C))					\
	    astr[aix++] = (char) (C);				\
	else if (aix > 0 && astr[aix-1] != ' ')			\
	    astr[aix++] = ' ';					\
   } while (0)

    do {
	errno = 0;
	file = fopen(filename, "r");
    } while (!file && errno == EINTR);
    if (!file) {
	usage_format("Failed to open arguments file \"%s\": %s\n",
		     filename,
		     errno_string());
    }

    while (1) {
	c = getc(file);
	if (c == EOF) {
	    if (ferror(file)) {
		if (errno == EINTR) {
		    clearerr(file);
		    continue;
		}
		usage_format("Failed to read arguments file \"%s\": %s\n",
			     filename,
			     errno_string());
	    }
	    break;
	}

	switch (quote | cmnt | c) {
	case '\\':
	    quote = EAF_QUOTE;
	    break;
	case '#':
	    cmnt = EAF_CMNT;
	    break;
	case EAF_CMNT|'\n':
	    cmnt = 0;
	    /* Fall through... */
	case '\n':
	case '\f':
	case '\r':
	case '\t':
	case '\v':
	    if (!quote)
		c = ' ';
	    /* Fall through... */
	default:
	    if (!cmnt)
		SAVE_CHAR(c);
	    quote = 0;
	    break;
	}
    }

    SAVE_CHAR('\0');

    fclose(file);

    if (astr[0] == '\0')
	res = NULL;
    else
	res = build_args_from_string(astr);

    efree(astr);

    return res;

#undef EAF_CMNT
#undef EAF_QUOTE
#undef SAVE_CHAR
}

typedef struct {
    char **argv;
    int argc;
    int size;
} argv_buf;

static void
trim_argv_buf(argv_buf *abp)
{
    abp->argv = erealloc(abp->argv, sizeof(char *)*(abp->size = abp->argc));
}

static void
save_arg(argv_buf *abp, char *arg)
{
    if (abp->size <= abp->argc) {
	if (!abp->argv)
	    abp->argv = emalloc(sizeof(char *)*(abp->size = 100));
	else
	    abp->argv = erealloc(abp->argv, sizeof(char *)*(abp->size += 100));
    }
    abp->argv[abp->argc++] = arg;
}

#define DEF_ARGV_STACK_SIZE 10
#define ARGV_STACK_SIZE_INCR 50

typedef struct {
    char **argv;
    int ix;
} argv_stack_element;

typedef struct {
    int top_ix;
    int size;
    argv_stack_element *base;
    argv_stack_element def_buf[DEF_ARGV_STACK_SIZE];
} argv_stack;

#define ARGV_STACK_INIT(S)		\
do {					\
    (S)->top_ix = 0;			\
    (S)->size = DEF_ARGV_STACK_SIZE;	\
    (S)->base = &(S)->def_buf[0];	\
} while (0)

static void
push_argv(argv_stack *stck, char **argv, int ix)
{
    if (stck->top_ix == stck->size) {
	if (stck->base != &stck->def_buf[0]) {
	    stck->size += ARGV_STACK_SIZE_INCR;
	    stck->base = erealloc(stck->base,
				  sizeof(argv_stack_element)*stck->size);
	}
	else {
	    argv_stack_element *base;
	    base = emalloc(sizeof(argv_stack_element)
			   *(stck->size + ARGV_STACK_SIZE_INCR));
	    memcpy((void *) base,
		   (void *) stck->base,
		   sizeof(argv_stack_element)*stck->size);
	    stck->base = base;
	    stck->size += ARGV_STACK_SIZE_INCR;
	}
    }
    stck->base[stck->top_ix].argv = argv;
    stck->base[stck->top_ix++].ix = ix;
}

static void
pop_argv(argv_stack *stck, char ***argvp, int *ixp)
{
    if (stck->top_ix == 0) {
	*argvp = NULL;
	*ixp = 0;
    }
    else {
	*argvp = stck->base[--stck->top_ix].argv;
	*ixp = stck->base[stck->top_ix].ix;
	if (stck->top_ix == 0 && stck->base != &stck->def_buf[0]) {
	    efree(stck->base);
	    stck->base = &stck->def_buf[0];
	    stck->size = DEF_ARGV_STACK_SIZE;
	}
    }
}

static void
get_file_args(char *filename, argv_buf *abp, argv_buf *xabp)
{
    argv_stack stck;
    int i;
    char **argv;

    ARGV_STACK_INIT(&stck);

    i = 0;
    argv = read_args_file(filename);
    
    while (argv) {
	
	while (argv[i]) {
	    if (strcmp(argv[i], "-args_file") == 0) {
		char **new_argv;
		char *fname;
		if (!argv[++i])
		    usage("-args_file");
		fname = argv[i++];
		new_argv = read_args_file(fname);
		if (new_argv) {
		    if (argv[i])
			push_argv(&stck, argv, i);
		    else
			efree(argv);
		    i = 0;
		    argv = new_argv;
		}
	    }
	    else {
		if (strcmp(argv[i], "-extra") == 0) {
		    i++;
		    while (argv[i])
			save_arg(xabp, argv[i++]);
		    break;
		}
		save_arg(abp, argv[i++]);
	    }
	}

	efree(argv);

	pop_argv(&stck, &argv, &i);
    }
}

static void
initial_argv_massage(int *argc, char ***argv)
{
    argv_buf ab = {0}, xab = {0};
    int ix, vix, ac;
    char **av;
    struct {
	int argc;
	char **argv;
    } avv[] = {{INT_MAX, NULL}, {INT_MAX, NULL}, {INT_MAX, NULL},
	       {INT_MAX, NULL}, {INT_MAX, NULL}, {INT_MAX, NULL}};
    /*
     * The environment flag containing OTP release is intentionally
     * undocumented and intended for OTP internal use only.
     */

    vix = 0;

    av = build_args_from_env("ERL_OTP" OTP_SYSTEM_VERSION "_FLAGS");
    if (av)
	avv[vix++].argv = av;

    av = build_args_from_env("ERL_AFLAGS");
    if (av)
	avv[vix++].argv = av;

    /* command line */
    if (*argc > 1) {
	avv[vix].argc = *argc - 1;
	avv[vix++].argv = &(*argv)[1];
    }

    av = build_args_from_env("ERL_FLAGS");
    if (av)
	avv[vix++].argv = av;

    av = build_args_from_env("ERL_ZFLAGS");
    if (av)
	avv[vix++].argv = av;

    if (vix == (*argc > 1 ? 1 : 0)) {
	/* Only command line argv; check if we can use argv as it is... */
	ac = *argc;
	av = *argv;
	for (ix = 1; ix < ac; ix++) {
	    if (strcmp(av[ix], "-args_file") == 0) {
		/* ... no; we need to expand arguments from
		   file into argument list */
		goto build_new_argv;
	    }
	    if (strcmp(av[ix], "-extra") == 0) {
		break;
	    }
	}

	/* ... yes; we can use argv as it is. */
	return;
    }

 build_new_argv:

    save_arg(&ab, (*argv)[0]);
    
    vix = 0;
    while (avv[vix].argv) {
	ac = avv[vix].argc;
	av = avv[vix].argv;

	ix = 0;
	while (ix < ac && av[ix]) {
	    if (strcmp(av[ix], "-args_file") == 0) {
		if (++ix == ac)
		    usage("-args_file");
		get_file_args(av[ix++], &ab, &xab);
	    }
	    else {
		if (strcmp(av[ix], "-extra") == 0) {
		    ix++;
		    while (ix < ac && av[ix])
			save_arg(&xab, av[ix++]);
		    break;
		}
		save_arg(&ab, av[ix++]);
	    }
	}

	vix++;
    }

    vix = 0;
    while (avv[vix].argv) {
	if (avv[vix].argc == INT_MAX) /* not command line */
	    efree(avv[vix].argv);
	vix++;
    }

    if (xab.argc) {
	save_arg(&ab, "-extra");
	for (ix = 0; ix < xab.argc; ix++)
	    save_arg(&ab, xab.argv[ix]);
	efree(xab.argv);
    }

    save_arg(&ab, NULL);
    trim_argv_buf(&ab);
    *argv = ab.argv;
    *argc = ab.argc - 1;
}

#ifdef __WIN32__
static char*
possibly_quote(char* arg)
{
    int mustQuote = NO;
    int n = 0;
    char* s;
    char* narg;

    /*
     * Scan the string to find out if it needs quoting and return
     * the original argument if not.
     */

    for (s = arg; *s; s++, n++) {
	if (*s == ' ' || *s == '"') {
	    mustQuote = YES;
	    n++;
	}
    }
    if (!mustQuote) {
	return arg;
    }

    /*
     * Insert the quotes and put a backslash in front of every quote
     * inside the string.
     */

    s = narg = emalloc(n+2+1);
    for (*s++ = '"'; *arg; arg++, s++) {
	if (*s == '"') {
	    *s++ = '\\';
	}
	*s = *arg;
    }
    *s++ = '"';
    *s = '\0';
    return narg;
}

/*
 * Unicode helpers to handle environment and command line parameters on
 * Windows. We internally handle all environment variables in UTF8,
 * but put and get the environment using the WCHAR (limited UTF16) interface
 * 
 * These are simplified to only handle Unicode characters that can fit in 
 * Windows simplified UTF16, i.e. characters that fit in 16 bits.
 */

static int utf8_len(unsigned char first) 
{
    if ((first & ((unsigned char) 0x80)) == 0) {
	return 1;
    } else if ((first & ((unsigned char) 0xE0)) == 0xC0) {
	return 2;
    } else if ((first & ((unsigned char) 0xF0)) == 0xE0) {
	return 3;
    } else if ((first & ((unsigned char) 0xF8)) == 0xF0) {
	return 4;
    } 
    return 1; /* will be a '?' */
}

static WCHAR *utf8_to_utf16(unsigned char *bytes)
{
    unsigned int unipoint;
    unsigned char *tmp = bytes;
    WCHAR *target, *res;
    int num = 0;
    
    while (*tmp) {
	num++;
	tmp += utf8_len(*tmp);
    }
    res = target = emalloc((num + 1) * sizeof(WCHAR));
    while (*bytes) {
	if (((*bytes) & ((unsigned char) 0x80)) == 0) {
	    unipoint = (Uint) *bytes;
	    ++bytes;
	} else if (((*bytes) & ((unsigned char) 0xE0)) == 0xC0) {
	    unipoint = 
		(((Uint) ((*bytes) & ((unsigned char) 0x1F))) << 6) |
		((Uint) (bytes[1] & ((unsigned char) 0x3F))); 	
	    bytes += 2;
	} else if (((*bytes) & ((unsigned char) 0xF0)) == 0xE0) {
	    unipoint = 
		(((Uint) ((*bytes) & ((unsigned char) 0xF))) << 12) |
		(((Uint) (bytes[1] & ((unsigned char) 0x3F))) << 6) |
		((Uint) (bytes[2] & ((unsigned char) 0x3F)));
	    if (unipoint > 0xFFFF) {
		 unipoint = (unsigned int) '?';
	    }
	    bytes +=3;
	} else if (((*bytes) & ((unsigned char) 0xF8)) == 0xF0) {
	    unipoint = (unsigned int) '?'; /* Cannot put in a wchar */
	    bytes += 4;
	} else {
	    unipoint = (unsigned int) '?';
	}
	*target++ = (WCHAR) unipoint;
    }
    *target = L'\0';
    return res;
}

static int put_utf8(WCHAR ch, unsigned char *target, int sz, int *pos)
{
    Uint x = (Uint) ch;
    if (x < 0x80) {
    if (*pos >= sz) {
	return -1;
    }
	target[(*pos)++] = (unsigned char) x;
    }
    else if (x < 0x800) {
	if (((*pos) + 1) >= sz) {
	    return -1;
	}
	target[(*pos)++] = (((unsigned char) (x >> 6)) | 
			    ((unsigned char) 0xC0));
	target[(*pos)++] = (((unsigned char) (x & 0x3F)) | 
			    ((unsigned char) 0x80));
    } else {
	if ((x >= 0xD800 && x <= 0xDFFF) ||
	    (x == 0xFFFE) ||
	    (x == 0xFFFF)) { /* Invalid unicode range */
	    return -1;
	}
	if (((*pos) + 2) >= sz) {
	    return -1;
	}

	target[(*pos)++] = (((unsigned char) (x >> 12)) | 
			    ((unsigned char) 0xE0));
	target[(*pos)++] = ((((unsigned char) (x >> 6)) & 0x3F)  | 
			    ((unsigned char) 0x80));
	target[(*pos)++] = (((unsigned char) (x & 0x3F)) | 
			    ((unsigned char) 0x80));
    }
    return 0;
}

static int need_bytes_for_utf8(WCHAR x)
{
    if (x < 0x80)
	return 1;
    else if (x < 0x800)
	return 2;
    else 
	return 3;
}

static WCHAR *latin1_to_utf16(char *str)
{
    int len = strlen(str);
    int i;
    WCHAR *wstr = emalloc((len+1) * sizeof(WCHAR));
    for(i=0;i<len;++i)
	wstr[i] = (WCHAR) str[i];
    wstr[len] = L'\0';
    return wstr;
}

static char *utf16_to_utf8(WCHAR *wstr) 
{
    int len = wcslen(wstr);
    char *result;
    int i,pos;
    int reslen = 0;
    for(i=0;i<len;++i) {
	reslen += need_bytes_for_utf8(wstr[i]);
    }
    result = emalloc(reslen+1);
    pos = 0;
    for(i=0;i<len;++i) {
	if (put_utf8((int) wstr[i], result, reslen, &pos) < 0) {
	    break;
	}
    }
    result[pos] = '\0';
    return result;
}
    
#endif