~drizzle-trunk/drizzle/development

/* 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; version 2 of the License.

   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 ~/

 --defaults-group-suffix  ; Also read groups with concat(group, suffix)

 --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>

const char *my_defaults_file=0;

const char *my_defaults_group_suffix=0;

char *my_defaults_extra_file=0;

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

#define MAX_DEFAULT_DIRS 6

const char *default_directories[MAX_DEFAULT_DIRS + 1];

static const char *f_extensions[]= { ".cnf", 0 };

#define NEWLINE "\n"

static int handle_default_option(void *in_ctx, const char *group_name,

                                 const char *option);

/*

   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);

/**

  Create the list of default directories.

  @details

  On all systems, if a directory is already in the list, it will be moved

  to the end of the list.  This avoids reading defaults files multiple times,

  while ensuring the correct precedence.

  @return void

*/

static void (*init_default_directories)(void);

static char *remove_end_comment(char *ptr);

/*

  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

    Process the default options from argc & argv

    Read through each found config file looks and calls 'func' to process

    each option.

  NOTES

    --defaults-group-suffix is only processed if we are called from

    load_defaults().

  RETURN

    0  ok

    1  given cinf_file doesn't exist

    The global variable 'my_defaults_group_suffix' is updated with value for

    --defaults_group_suffix

*/

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 */

  *args_used+= get_defaults_options(*argc - *args_used, *argv + *args_used,

                                    (char **) &forced_default_file,

                                    (char **) &forced_extra_defaults,

                                    (char **) &my_defaults_group_suffix);

  if (! my_defaults_group_suffix)

    my_defaults_group_suffix= getenv(STRINGIFY_ARG(DEFAULT_GROUP_SUFFIX_ENV));

  if (forced_extra_defaults)

    my_defaults_extra_file= (char *) forced_extra_defaults;

  if (forced_default_file)

    my_defaults_file= forced_default_file;

  /*

    We can only handle 'defaults-group-suffix' if we are called from

    load_defaults() as otherwise we can't know the type of 'func_ctx'

  */

  if (my_defaults_group_suffix && func == handle_default_option)

  {

    /* Handle --defaults-group-suffix= */

    uint i;

    const char **extra_groups;

    const uint instance_len= strlen(my_defaults_group_suffix); 

    struct handle_option_ctx *ctx= (struct handle_option_ctx*) func_ctx;

    char *ptr;

    TYPELIB *group= ctx->group;

    if (!(extra_groups= 

	  (const char**)alloc_root(ctx->alloc,

                                   (2*group->count+1)*sizeof(char*))))

      goto err;

    for (i= 0; i < group->count; i++)

    {

      uint len;

      extra_groups[i]= group->type_names[i]; /** copy group */

      len= strlen(extra_groups[i]);

      if (!(ptr= alloc_root(ctx->alloc, len+instance_len+1)))

	goto err;

      extra_groups[i+group->count]= ptr;

      /** Construct new group */

      memcpy(ptr, extra_groups[i], len);

      memcpy(ptr+len, my_defaults_group_suffix, instance_len+1);

    }

    group->count*= 2;

    group->type_names= extra_groups;

    group->type_names[group->count]= 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 (my_defaults_extra_file)

      {

        if ((error= search_default_file_with_ext(func, func_ctx, "", "",

                                                my_defaults_extra_file, 0)) < 0)

	  goto err;				/* Fatal error */

        if (error > 0)

        {

          fprintf(stderr, "Could not open required defaults file: %s\n",

                  my_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). If it

                            is NULL, we are handling a new group (section).

  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 (!option)

    return 0;

  if (find_type((char *)group_name, ctx->group, 3))

  {

    if (!(tmp= alloc_root(ctx->alloc, strlen(option) + 1)))

      return 1;

    if (insert_dynamic(ctx->args, (uchar*) &tmp))

      return 1;

    strmov(tmp, option);

  }

  return 0;

}

/*

  Gets options from the command line

  SYNOPSIS

    get_defaults_options()

    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

    # Number of arguments used from *argv

      defaults and extra_defaults will be set to option of the appropriate

      items of argv array, or to NULL if there are no such options

*/

int get_defaults_options(int argc, char **argv,

                         char **defaults,

                         char **extra_defaults,

                         char **group_suffix)

{

  int org_argc= argc, prev_argc= 0;

  *defaults= *extra_defaults= *group_suffix= 0;

  while (argc >= 2 && argc != prev_argc)

  {

    /* Skip program name or previously handled argument */

    argv++;

    prev_argc= argc;                            /* To check if we found */

    if (!*defaults && is_prefix(*argv,"--defaults-file="))

    {

      *defaults= *argv + sizeof("--defaults-file=")-1;

       argc--;

       continue;

    }

    if (!*extra_defaults && is_prefix(*argv,"--defaults-extra-file="))

    {

      *extra_defaults= *argv + sizeof("--defaults-extra-file=")-1;

      argc--;

      continue;

    }

    if (!*group_suffix && is_prefix(*argv, "--defaults-group-suffix="))

    {

      *group_suffix= *argv + sizeof("--defaults-group-suffix=")-1;

      argc--;

      continue;

    }

  }

  return org_argc - argc;

}

/*

  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;

  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);

  /*

    Check if the user doesn't want any default option processing

    --no-defaults is always the first option

  */

  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((uchar*) (res+1), args.buffer, args.elements*sizeof(char*));

  /* Skip --defaults-xxx options */

  (*argc)-= args_used;

  (*argv)+= args_used;

  /*

    Check if we wan't to see the new argument list

    This options must always be the last of the default options

  */

  if (*argc >= 2 && !strcmp(argv[0][1],"--print-defaults"))

  {

    found_print_defaults=1;

    --*argc; ++*argv;				/* skip argument */

  }

  if (*argc)

    memcpy((uchar*) (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 };

  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, size_t 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;

  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);

  {

    struct stat stat_info;

    if (stat(name,&stat_info))

      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;

    }

  }

  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;

      }

      /* Remove end space */

      for ( ; my_isspace(&my_charset_latin1,end[-1]) ; end--) ;

      end[0]=0;

      strmake(curr_gr, ptr, min((size_t) (end-ptr)+1, sizeof(curr_gr)-1));

      /* signal that a new group is found */

      opt_handler(handler_ctx, curr_gr, NULL);

      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, (size_t) (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 == '\'') && /* First char is quote */

          (value + 1 < value_end ) && /* String is longer than 1 */

          *value == value_end[-1] ) /* First char is equal to last char */

      {

	value++;

	value_end--;

      }

      ptr=strnmov(strmov(option,"--"),ptr,(size_t) (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;