/* Copyright (C) 2000-2003 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/****************************************************************************
 Add all options from files named "group".cnf from the default_directories
 before the command line arguments.
 On Windows defaults will also search in the Windows directory for a file
 called 'group'.ini
 As long as the program uses the last argument for conflicting
 options one only have to add a call to "load_defaults" to enable
 use of default values.
 pre- and end 'blank space' are removed from options and values. The
 following escape sequences are recognized in values:  \b \t \n \r \\

 The following arguments are handled automaticly;  If used, they must be
 first argument on the command line!
 --no-defaults	; no options are read.
 --defaults-file=full-path-to-default-file	; Only this file will be read.
 --defaults-extra-file=full-path-to-default-file ; Read this file before ~/
 --print-defaults	; Print the modified command line and exit
****************************************************************************/

#include "mysys_priv.h"
#include "m_string.h"
#include "m_ctype.h"
#include <my_dir.h>
#ifdef __WIN__
#include <winbase.h>
#endif

char *defaults_extra_file=0;

/* Which directories are searched for options (and in which order) */

#define MAX_DEFAULT_DIRS 5
const char *default_directories[MAX_DEFAULT_DIRS + 1];

#ifdef __WIN__
static const char *f_extensions[]= { ".ini", ".cnf", 0 };
#define NEWLINE "\r\n"
static char system_dir[FN_REFLEN], shared_system_dir[FN_REFLEN];
#else
static const char *f_extensions[]= { ".cnf", 0 };
#define NEWLINE "\n"
#endif

/*
   This structure defines the context that we pass to callback
   function 'handle_default_option' used in search_default_file
   to process each option. This context is used if search_default_file
   was called from load_defaults.
*/

struct handle_option_ctx
{
   MEM_ROOT *alloc;
   DYNAMIC_ARRAY *args;
   TYPELIB *group;
};

static int search_default_file(Process_option_func func, void *func_ctx,
			       const char *dir, const char *config_file);
static int search_default_file_with_ext(Process_option_func func,
                                        void *func_ctx,
					const char *dir, const char *ext,
					const char *config_file, int recursion_level);
static void init_default_directories();

static char *remove_end_comment(char *ptr);

/*
  Add/remove option to the option file section.

  SYNOPSYS
    my_correct_file()
    file_location     The location of configuration file to edit
    option            option to look for
    option value      The value of the option we would like to set
    section_name      the name of the section
    remove_option     This is true if we want to remove the option.
                      False otherwise.
  IMPLEMENTATION
    We open the option file first, then read the file line-by-line,
    looking for the section we need. At the same time we put these lines
    into a buffer. Then we look for the option within this section and
    change/remove it. In the end we get a buffer with modified version of the
    file. Then we write it to the file, truncate it if needed and close it.

  RETURN
    0 - ok
    1 - some error has occured. Probably due to the lack of resourses
   -1 - cannot open the file
*/

int my_correct_defaults_file(const char *file_location, const char *option,
                             const char *option_value,
                             const char *section_name, int remove_option)
{
  FILE *cnf_file;
  struct stat file_stat;
  char linebuff[512], *ptr;
  uint optlen;
  uint len;
  char *file_buffer;
  uint position= 0;
  int is_found= FALSE;
  DBUG_ENTER("my_correct_defaults_file");

  optlen= strlen(option);

  if (!(cnf_file= my_fopen(file_location, O_RDWR, MYF(0))))
    goto err_fopen;

  /* my_fstat doesn't use the flag parameter */
  if (my_fstat(fileno(cnf_file), &file_stat, MYF(0)))
    goto err;

  /*
    Reserve space to read the contents of the file and some more
    for the option we want ot add.
  */
  file_buffer= (char*) my_malloc(sizeof(char)*
                       (file_stat.st_size + /* current file size */
                        optlen +            /* option name len */
                        2 +                 /* reserve space for newline */
                        1 +                 /* reserve for '=' char */
                        strlen(option_value)),  /* option value len */
                        MYF(MY_WME));

  if (!file_buffer)
    goto malloc_err;
  while (fgets(linebuff, sizeof(linebuff), cnf_file))
  {
    len= strlen(linebuff);

    /* if the section is found traverse it */
    if (is_found)
    {
      /* skip the old value of the option we are changing */
      if (strncmp(linebuff, option, optlen))
      {
        /* copy all other lines */
        strmake(file_buffer + position, linebuff, len);
        position+= len;
      }
    }
    else
    {
      strmake(file_buffer + position, linebuff, len);
      position+= len;
    }


    /* looking for appropriate section */
    for (ptr= linebuff ; my_isspace(&my_charset_latin1,*ptr) ; ptr++)
    {}

    if (*ptr == '[')
    {
      /* copy the line to the buffer */
      if (!strncmp(++ptr, section_name, strlen(section_name)))
      {
        is_found= TRUE;
        /* add option */
        if (!remove_option)
        {
          strmake(file_buffer + position, option, optlen);
          position+= optlen;
          if (*option_value)
          {
            *(file_buffer + position++)= '=';
            strmake(file_buffer + position, option_value,
                    strlen(option_value));
            position+= strlen(option_value);
          }
          /* add a newline */
          strcat(file_buffer + position, NEWLINE);
          position+= strlen(NEWLINE);
        }
      }
      else
        is_found= FALSE; /* mark that this section is of no interest to us */
    }

  }

  if (my_chsize(fileno(cnf_file), position, 0, MYF(MY_WME)) ||
      my_fseek(cnf_file, 0, MY_SEEK_SET, MYF(0)) ||
      my_fwrite(cnf_file, file_buffer, position, MYF(MY_NABP)) ||
      my_fclose(cnf_file, MYF(MY_WME)))
     goto err;

  my_free(file_buffer, MYF(0));

  DBUG_RETURN(0);

err:
  my_free(file_buffer, MYF(0));
malloc_err:
  my_fclose(cnf_file, MYF(0));
  DBUG_RETURN(1); /* out of resources */
err_fopen:
  DBUG_RETURN(-1); /* cannot access the option file */
}


/*
  Process config files in default directories.

  SYNOPSIS
  my_search_option_files()
  conf_file                   Basename for configuration file to search for.
                              If this is a path, then only this file is read.
  argc                        Pointer to argc of original program
  argv                        Pointer to argv of original program
  args_used                   Pointer to variable for storing the number of
                              arguments used.
  func                        Pointer to the function to process options
  func_ctx                    It's context. Usually it is the structure to
                              store additional options.
  DESCRIPTION

  This function looks for config files in default directories. Then it
  travesrses each of the files and calls func to process each option.

  RETURN
    0  ok
    1  given cinf_file doesn't exist
*/

int my_search_option_files(const char *conf_file, int *argc, char ***argv,
                        uint *args_used, Process_option_func func,
                        void *func_ctx)
{
  const char **dirs, *forced_default_file, *forced_extra_defaults;
  int error= 0;
  DBUG_ENTER("my_search_option_files");

  /* Check if we want to force the use a specific default file */
  get_defaults_files(*argc, *argv,
                      (char **)&forced_default_file,
                      (char **)&forced_extra_defaults);
  if (forced_default_file)
    forced_default_file= strchr(forced_default_file,'=')+1;
  if (forced_extra_defaults)
    defaults_extra_file= strchr(forced_extra_defaults,'=')+1;

  (*args_used)+= (forced_default_file ? 1 : 0) +
                 (forced_extra_defaults ? 1 : 0);

  if (forced_default_file)
  {
    if ((error= search_default_file_with_ext(func, func_ctx, "", "",
                                             forced_default_file, 0)) < 0)
      goto err;
    if (error > 0)
    {
      fprintf(stderr, "Could not open required defaults file: %s\n",
              forced_default_file);
      goto err;
    }
  }
  else if (dirname_length(conf_file))
  {
    if ((error= search_default_file(func, func_ctx, NullS, conf_file)) < 0)
      goto err;
  }
  else
  {
    for (dirs= default_directories ; *dirs; dirs++)
    {
      if (**dirs)
      {
	if (search_default_file(func, func_ctx, *dirs, conf_file) < 0)
	  goto err;
      }
      else if (defaults_extra_file)
      {
        if ((error= search_default_file_with_ext(func, func_ctx, "", "",
                                                defaults_extra_file, 0)) < 0)
	  goto err;				/* Fatal error */
        if (error > 0)
        {
          fprintf(stderr, "Could not open required defaults file: %s\n",
                  defaults_extra_file);
          goto err;
        }
      }
    }
  }

  DBUG_RETURN(error);

err:
  fprintf(stderr,"Fatal error in defaults handling. Program aborted\n");
  exit(1);
  return 0;					/* Keep compiler happy */
}


/*
  The option handler for load_defaults.

  SYNOPSIS
    handle_deault_option()
    in_ctx                  Handler context. In this case it is a
                            handle_option_ctx structure.
    group_name              The name of the group the option belongs to.
    option                  The very option to be processed. It is already
                            prepared to be used in argv (has -- prefix)

  DESCRIPTION
    This handler checks whether a group is one of the listed and adds an option
    to the array if yes. Some other handler can record, for instance, all
    groups and their options, not knowing in advance the names and amount of
    groups.

  RETURN
    0 - ok
    1 - error occured
*/

static int handle_default_option(void *in_ctx, const char *group_name,
                                 const char *option)
{
  char *tmp;
  struct handle_option_ctx *ctx= (struct handle_option_ctx *) in_ctx;

  if (find_type((char *)group_name, ctx->group, 3))
  {
    if (!(tmp= alloc_root(ctx->alloc, (uint) strlen(option) + 1)))
      return 1;
    if (insert_dynamic(ctx->args, (gptr) &tmp))
      return 1;
    strmov(tmp, option);
  }

  return 0;
}


/*
  Gets --defaults-file and --defaults-extra-file options from command line.

  SYNOPSIS
    get_defaults_files()
    argc			Pointer to argc of original program
    argv			Pointer to argv of original program
    defaults                    --defaults-file option
    extra_defaults              --defaults-extra-file option

  RETURN
    defaults and extra_defaults will be set to appropriate items
    of argv array, or to NULL if there are no such options
*/

void get_defaults_files(int argc, char **argv,
                        char **defaults, char **extra_defaults)
{
  *defaults=0;
  *extra_defaults=0;
  if (argc >= 2)
  {
    if (is_prefix(argv[1],"--defaults-file="))
      *defaults= argv[1];
    else if (is_prefix(argv[1],"--defaults-extra-file="))
      *extra_defaults= argv[1];
  }
}


/*
  Read options from configurations files

  SYNOPSIS
    load_defaults()
    conf_file			Basename for configuration file to search for.
    				If this is a path, then only this file is read.
    groups			Which [group] entrys to read.
				Points to an null terminated array of pointers
    argc			Pointer to argc of original program
    argv			Pointer to argv of original program

  IMPLEMENTATION

   Read options from configuration files and put them BEFORE the arguments
   that are already in argc and argv.  This way the calling program can
   easily command line options override options in configuration files

   NOTES
    In case of fatal error, the function will print a warning and do
    exit(1)
 
    To free used memory one should call free_defaults() with the argument
    that was put in *argv

   RETURN
     0	ok
     1	The given conf_file didn't exists
*/


int load_defaults(const char *conf_file, const char **groups,
                  int *argc, char ***argv)
{
  DYNAMIC_ARRAY args;
  TYPELIB group;
  my_bool found_print_defaults=0;
  uint args_used=0;
  int error= 0;
  MEM_ROOT alloc;
  char *ptr,**res;
  struct handle_option_ctx ctx;
  DBUG_ENTER("load_defaults");

  init_default_directories();
  init_alloc_root(&alloc,512,0);
  if (*argc >= 2 && !strcmp(argv[0][1],"--no-defaults"))
  {
    /* remove the --no-defaults argument and return only the other arguments */
    uint i;
    if (!(ptr=(char*) alloc_root(&alloc,sizeof(alloc)+
				 (*argc + 1)*sizeof(char*))))
      goto err;
    res= (char**) (ptr+sizeof(alloc));
    res[0]= **argv;				/* Copy program name */
    for (i=2 ; i < (uint) *argc ; i++)
      res[i-1]=argv[0][i];
    res[i-1]=0;					/* End pointer */
    (*argc)--;
    *argv=res;
    *(MEM_ROOT*) ptr= alloc;			/* Save alloc root for free */
    DBUG_RETURN(0);
  }

  group.count=0;
  group.name= "defaults";
  group.type_names= groups;

  for (; *groups ; groups++)
    group.count++;

  if (my_init_dynamic_array(&args, sizeof(char*),*argc, 32))
    goto err;

  ctx.alloc= &alloc;
  ctx.args= &args;
  ctx.group= &group;

  error= my_search_option_files(conf_file, argc, argv, &args_used,
                      handle_default_option, (void *) &ctx);
  /*
    Here error contains <> 0 only if we have a fully specified conf_file
    or a forced default file
  */
  if (!(ptr=(char*) alloc_root(&alloc,sizeof(alloc)+
			       (args.elements + *argc +1) *sizeof(char*))))
    goto err;
  res= (char**) (ptr+sizeof(alloc));

  /* copy name + found arguments + command line arguments to new array */
  res[0]= argv[0][0];  /* Name MUST be set, even by embedded library */
  memcpy((gptr) (res+1), args.buffer, args.elements*sizeof(char*));
  /* Skip --defaults-file and --defaults-extra-file */
  (*argc)-= args_used;
  (*argv)+= args_used;

  /* Check if we wan't to see the new argument list */
  if (*argc >= 2 && !strcmp(argv[0][1],"--print-defaults"))
  {
    found_print_defaults=1;
    --*argc; ++*argv;				/* skip argument */
  }

  if (*argc)
    memcpy((gptr) (res+1+args.elements), (char*) ((*argv)+1),
	   (*argc-1)*sizeof(char*));
  res[args.elements+ *argc]=0;			/* last null */

  (*argc)+=args.elements;
  *argv= (char**) res;
  *(MEM_ROOT*) ptr= alloc;			/* Save alloc root for free */
  delete_dynamic(&args);
  if (found_print_defaults)
  {
    int i;
    printf("%s would have been started with the following arguments:\n",
	   **argv);
    for (i=1 ; i < *argc ; i++)
      printf("%s ", (*argv)[i]);
    puts("");
    exit(0);
  }
  DBUG_RETURN(error);

 err:
  fprintf(stderr,"Fatal error in defaults handling. Program aborted\n");
  exit(1);
  return 0;					/* Keep compiler happy */
}


void free_defaults(char **argv)
{
  MEM_ROOT ptr;
  memcpy_fixed((char*) &ptr,(char *) argv - sizeof(ptr), sizeof(ptr));
  free_root(&ptr,MYF(0));
}


static int search_default_file(Process_option_func opt_handler,
                               void *handler_ctx,
			       const char *dir,
			       const char *config_file)
{
  char **ext;
  const char *empty_list[]= { "", 0 };
  my_bool have_ext= fn_ext(config_file)[0] != 0;
  const char **exts_to_use= have_ext ? empty_list : f_extensions;

  for (ext= (char**) exts_to_use; *ext; *ext++)
  {
    int error;
    if ((error= search_default_file_with_ext(opt_handler, handler_ctx,
                                             dir, *ext,
					     config_file, 0)) < 0)
      return error;
  }
  return 0;
}


/*
  Skip over keyword and get argument after keyword

  SYNOPSIS
   get_argument()
   keyword		Include directive keyword
   kwlen		Length of keyword
   ptr			Pointer to the keword in the line under process
   line			line number

  RETURN
   0	error
   #	Returns pointer to the argument after the keyword.
*/

static char *get_argument(const char *keyword, uint kwlen,
                          char *ptr, char *name, uint line)
{
  char *end;

  /* Skip over "include / includedir keyword" and following whitespace */

  for (ptr+= kwlen - 1;
       my_isspace(&my_charset_latin1, ptr[0]);
       ptr++)
  {}

  /*
    Trim trailing whitespace from directory name
    The -1 below is for the newline added by fgets()
    Note that my_isspace() is true for \r and \n
  */
  for (end= ptr + strlen(ptr) - 1;
       my_isspace(&my_charset_latin1, *(end - 1));
       end--)
  {}
  end[0]= 0;                                    /* Cut off end space */

  /* Print error msg if there is nothing after !include* directive */
  if (end <= ptr)
  {
    fprintf(stderr,
	    "error: Wrong '!%s' directive in config file: %s at line %d\n",
	    keyword, name, line);
    return 0;
  }
  return ptr;
}


/*
  Open a configuration file (if exists) and read given options from it

  SYNOPSIS
    search_default_file_with_ext()
    opt_handler                 Option handler function. It is used to process
                                every separate option.
    handler_ctx                 Pointer to the structure to store actual 
                                parameters of the function.
    dir				directory to read
    ext				Extension for configuration file
    config_file                 Name of configuration file
    group			groups to read
    recursion_level             the level of recursion, got while processing
                                "!include" or "!includedir"

  RETURN
    0   Success
    -1	Fatal error, abort
     1	File not found (Warning)
*/

static int search_default_file_with_ext(Process_option_func opt_handler,
                                        void *handler_ctx,
                                        const char *dir,
                                        const char *ext,
                                        const char *config_file,
                                        int recursion_level)
{
  char name[FN_REFLEN + 10], buff[4096], curr_gr[4096], *ptr, *end, **tmp_ext;
  char *value, option[4096], tmp[FN_REFLEN];
  static const char includedir_keyword[]= "includedir";
  static const char include_keyword[]= "include";
  const int max_recursion_level= 10;
  FILE *fp;
  uint line=0;
  my_bool found_group=0;
  uint i;
  MY_DIR *search_dir;
  FILEINFO *search_file;

  if ((dir ? strlen(dir) : 0 )+strlen(config_file) >= FN_REFLEN-3)
    return 0;					/* Ignore wrong paths */
  if (dir)
  {
    end=convert_dirname(name, dir, NullS);
    if (dir[0] == FN_HOMELIB)		/* Add . to filenames in home */
      *end++='.';
    strxmov(end,config_file,ext,NullS);
  }
  else
  {
    strmov(name,config_file);
  }
  fn_format(name,name,"","",4);
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
  {
    MY_STAT stat_info;
    if (!my_stat(name,&stat_info,MYF(0)))
      return 1;
    /*
      Ignore world-writable regular files.
      This is mainly done to protect us to not read a file created by
      the mysqld server, but the check is still valid in most context. 
    */
    if ((stat_info.st_mode & S_IWOTH) &&
	(stat_info.st_mode & S_IFMT) == S_IFREG)
    {
      fprintf(stderr, "Warning: World-writable config file '%s' is ignored\n",
              name);
      return 0;
    }
  }
#endif
  if (!(fp= my_fopen(name, O_RDONLY, MYF(0))))
    return 1;					/* Ignore wrong files */

  while (fgets(buff, sizeof(buff) - 1, fp))
  {
    line++;
    /* Ignore comment and empty lines */
    for (ptr= buff; my_isspace(&my_charset_latin1, *ptr); ptr++)
    {}

    if (*ptr == '#' || *ptr == ';' || !*ptr)
      continue;

    /* Configuration File Directives */
    if ((*ptr == '!'))
    {
      if (recursion_level >= max_recursion_level)
      {
        for (end= ptr + strlen(ptr) - 1; 
             my_isspace(&my_charset_latin1, *(end - 1));
             end--)
        {}
        end[0]= 0;
        fprintf(stderr,
                "Warning: skipping '%s' directive as maximum include"
                "recursion level was reached in file %s at line %d\n",
                ptr, name, line);
        continue;
      }

      /* skip over `!' and following whitespace */
      for (++ptr; my_isspace(&my_charset_latin1, ptr[0]); ptr++)
      {}

      if ((!strncmp(ptr, includedir_keyword,
                    sizeof(includedir_keyword) - 1)) &&
          my_isspace(&my_charset_latin1, ptr[sizeof(includedir_keyword) - 1]))
      {
	if (!(ptr= get_argument(includedir_keyword,
                                sizeof(includedir_keyword),
                                ptr, name, line)))
	  goto err;

        if (!(search_dir= my_dir(ptr, MYF(MY_WME))))
          goto err;

        for (i= 0; i < (uint) search_dir->number_off_files; i++)
        {
          search_file= search_dir->dir_entry + i;
          ext= fn_ext(search_file->name);

          /* check extension */
          for (tmp_ext= (char**) f_extensions; *tmp_ext; *tmp_ext++)
          {
            if (!strcmp(ext, *tmp_ext))
              break;
          }

          if (*tmp_ext)
          {
            fn_format(tmp, search_file->name, ptr, "",
                      MY_UNPACK_FILENAME | MY_SAFE_PATH);

            search_default_file_with_ext(opt_handler, handler_ctx, "", "", tmp,
                                         recursion_level + 1);
          }
        }

        my_dirend(search_dir);
      }
      else if ((!strncmp(ptr, include_keyword, sizeof(include_keyword) - 1)) &&
               my_isspace(&my_charset_latin1, ptr[sizeof(include_keyword)-1]))
      {
	if (!(ptr= get_argument(include_keyword,
                                sizeof(include_keyword), ptr,
                                name, line)))
	  goto err;

        search_default_file_with_ext(opt_handler, handler_ctx, "", "", ptr,
                                     recursion_level + 1);
      }

      continue;
    }

    if (*ptr == '[')				/* Group name */
    {
      found_group=1;
      if (!(end=(char *) strchr(++ptr,']')))
      {
	fprintf(stderr,
		"error: Wrong group definition in config file: %s at line %d\n",
		name,line);
	goto err;
      }
      for ( ; my_isspace(&my_charset_latin1,end[-1]) ; end--) ;/* Remove end space */
      end[0]=0;

      strnmov(curr_gr, ptr, min((uint) (end-ptr)+1, 4096));
      continue;
    }
    if (!found_group)
    {
      fprintf(stderr,
	      "error: Found option without preceding group in config file: %s at line: %d\n",
	      name,line);
      goto err;
    }
    
   
    end= remove_end_comment(ptr);
    if ((value= strchr(ptr, '=')))
      end= value;				/* Option without argument */
    for ( ; my_isspace(&my_charset_latin1,end[-1]) ; end--) ;
    if (!value)
    {
      strmake(strmov(option,"--"),ptr,(uint) (end-ptr));
      if (opt_handler(handler_ctx, curr_gr, option))
        goto err;
    }
    else
    {
      /* Remove pre- and end space */
      char *value_end;
      for (value++ ; my_isspace(&my_charset_latin1,*value); value++) ;
      value_end=strend(value);
      /*
	We don't have to test for value_end >= value as we know there is
	an '=' before
      */
      for ( ; my_isspace(&my_charset_latin1,value_end[-1]) ; value_end--) ;
      if (value_end < value)			/* Empty string */
	value_end=value;

      /* remove quotes around argument */
      if ((*value == '\"' || *value == '\'') && *value == value_end[-1])
      {
	value++;
	value_end--;
      }
      ptr=strnmov(strmov(option,"--"),ptr,(uint) (end-ptr));
      *ptr++= '=';

      for ( ; value != value_end; value++)
      {
	if (*value == '\\' && value != value_end-1)
	{
	  switch(*++value) {
	  case 'n':
	    *ptr++='\n';
	    break;
	  case 't':
	    *ptr++= '\t';
	    break;
	  case 'r':
	    *ptr++ = '\r';
	    break;
	  case 'b':
	    *ptr++ = '\b';
	    break;
	  case 's':
	    *ptr++= ' ';			/* space */
	    break;
	  case '\"':
	    *ptr++= '\"';
	    break;
	  case '\'':
	    *ptr++= '\'';
	    break;
	  case '\\':
	    *ptr++= '\\';
	    break;
	  default:				/* Unknown; Keep '\' */
	    *ptr++= '\\';
	    *ptr++= *value;
	    break;
	  }
	}
	else
	  *ptr++= *value;
      }
      *ptr=0;
      if (opt_handler(handler_ctx, curr_gr, option))
        goto err;
    }
  }
  my_fclose(fp,MYF(0));
  return(0);

 err:
  my_fclose(fp,MYF(0));
  return -1;					/* Fatal error */
}


static char *remove_end_comment(char *ptr)
{
  char quote= 0;	/* we are inside quote marks */
  char escape= 0;	/* symbol is protected by escape chagacter */

  for (; *ptr; ptr++)
  {
    if ((*ptr == '\'' || *ptr == '\"') && !escape)
    {
      if (!quote)
	quote= *ptr;
      else if (quote == *ptr)
	quote= 0;
    }
    /* We are not inside a string */
    if (!quote && *ptr == '#')
    {
      *ptr= 0;
      return ptr;
    }
    escape= (quote && *ptr == '\\' && !escape);
  }
  return ptr;
}

#include <help_start.h>

void my_print_default_files(const char *conf_file)
{
  const char *empty_list[]= { "", 0 };
  my_bool have_ext= fn_ext(conf_file)[0] != 0;
  const char **exts_to_use= have_ext ? empty_list : f_extensions;
  char name[FN_REFLEN], **ext;
  const char **dirs;

  init_default_directories();
  puts("\nDefault options are read from the following files in the given order:");

  if (dirname_length(conf_file))
    fputs(conf_file,stdout);
  else
  {
    for (dirs=default_directories ; *dirs; dirs++)
    {
      for (ext= (char**) exts_to_use; *ext; *ext++)
      {
	const char *pos;
	char *end;
	if (**dirs)
	  pos= *dirs;
	else if (defaults_extra_file)
	  pos= defaults_extra_file;
	else
	  continue;
	end= convert_dirname(name, pos, NullS);
	if (name[0] == FN_HOMELIB)	/* Add . to filenames in home */
	  *end++='.';
	strxmov(end, conf_file, *ext, " ", NullS);
	fputs(name,stdout);
      }
    }
    puts("");
  }
}

void print_defaults(const char *conf_file, const char **groups)
{
  my_print_default_files(conf_file);

  fputs("The following groups are read:",stdout);
  for ( ; *groups ; groups++)
  {
    fputc(' ',stdout);
    fputs(*groups,stdout);
  }
  puts("\nThe following options may be given as the first argument:\n\
--print-defaults	Print the program argument list and exit\n\
--no-defaults		Don't read default options from any options file\n\
--defaults-file=#	Only read default options from the given file #\n\
--defaults-extra-file=# Read this file after the global files are read");
}

#include <help_end.h>


/*
  Create the list of default directories.

  On Microsoft Windows, this is:
    1. C:/
    2. GetWindowsDirectory()
    3. GetSystemWindowsDirectory()
    4. getenv(DEFAULT_HOME_ENV)
    5. ""

  On Novell NetWare, this is:
    1. sys:/etc/
    2. getenv(DEFAULT_HOME_ENV)
    3. ""

  On OS/2, this is:
    1. getenv(ETC)
    2. /etc/
    3. getenv(DEFAULT_HOME_ENV)
    4. ""
    5. "~/"

  Everywhere else, this is:
    1. /etc/
    2. getenv(DEFAULT_HOME_ENV)
    3. ""
    4. "~/"

 */

static void init_default_directories()
{
  const char *env, **ptr= default_directories;

#ifdef __WIN__
  *ptr++= "C:/";

  if (GetWindowsDirectory(system_dir,sizeof(system_dir)))
    *ptr++= &system_dir;
  /* Only add shared system directory if different from default. */
  if (GetSystemWindowsDirectory(shared_system_dir,sizeof(shared_system_dir)) &&
      strcmp(system_dir, shared_system_dir))
    *ptr++= &shared_system_dir;

#elif defined(__NETWARE__)
  *ptr++= "sys:/etc/";
#else
#if defined(__EMX__) || defined(OS2)
  if ((env= getenv("ETC")))
    *ptr++= env;
#endif
  *ptr++= "/etc/";
#endif
  if ((env= getenv(STRINGIFY_ARG(DEFAULT_HOME_ENV))))
    *ptr++= env;
  *ptr++= "";			/* Place for defaults_extra_file */
#if !defined(__WIN__) && !defined(__NETWARE__)
  *ptr++= "~/";;
#endif
  *ptr= 0;			/* end marker */
}