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/*
    cfgvar.h:

    Copyright (C) 2005 Istvan Varga

    This file is part of Csound.

    The Csound Library is free software; you can redistribute it
    and/or modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    Csound 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 Lesser General Public License for more details.

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

#ifndef CSOUND_CFGVAR_H
#define CSOUND_CFGVAR_H

#ifdef __cplusplus
extern "C" {
#endif

/* generic header structure */

typedef struct csCfgVariableHead_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    void            *p;               /* pointer to value                   */
    int             type;             /* type (e.g. CSOUNDCFG_INTEGER)      */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
} csCfgVariableHead_t;

/* int type */

typedef struct csCfgVariableInt_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    int             *p;               /* pointer to value                   */
    int             type;             /* type (CSOUNDCFG_INTEGER)           */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
    int             min;              /* minimum allowed value              */
    int             max;              /* maximum allowed value              */
} csCfgVariableInt_t;

/* boolean type (int with a value of 0 or 1) */

typedef struct csCfgVariableBoolean_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    int             *p;               /* pointer to value                   */
    int             type;             /* type (CSOUNDCFG_BOOLEAN)           */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
} csCfgVariableBoolean_t;

/* float type */

typedef struct csCfgVariableFloat_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    float           *p;               /* pointer to value                   */
    int             type;             /* type (CSOUNDCFG_FLOAT)             */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
    float           min;              /* minimum allowed value              */
    float           max;              /* maximum allowed value              */
} csCfgVariableFloat_t;

/* double type */

typedef struct csCfgVariableDouble_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    double          *p;               /* pointer to value                   */
    int             type;             /* type (CSOUNDCFG_DOUBLE)            */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
    double          min;              /* minimum allowed value              */
    double          max;              /* maximum allowed value              */
} csCfgVariableDouble_t;

/* MYFLT (float or double) type */

typedef struct csCfgVariableMYFLT_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    MYFLT           *p;               /* pointer to value                   */
    int             type;             /* type (CSOUNDCFG_MYFLT)             */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
    MYFLT           min;              /* minimum allowed value              */
    MYFLT           max;              /* maximum allowed value              */
} csCfgVariableMYFLT_t;

/* string type */

typedef struct csCfgVariableString_s {
    union csCfgVariable_u *nxt;       /* pointer to next structure in chain */
    unsigned char   *name;            /* name of the variable               */
    char            *p;               /* value: array of 'maxlen' chars     */
    int             type;             /* type (CSOUNDCFG_STRING)            */
    int             flags;            /* bitwise OR of flags                */
    unsigned char   *shortDesc;       /* short description (NULL if none)   */
    unsigned char   *longDesc;        /* long description (NULL if none)    */
    int             maxlen;           /* maximum length + 1                 */
} csCfgVariableString_t;

/* union of all variable types */

typedef union csCfgVariable_u {
  csCfgVariableHead_t       h;
  csCfgVariableInt_t        i;
  csCfgVariableBoolean_t    b;
  csCfgVariableFloat_t      f;
  csCfgVariableDouble_t     d;
  csCfgVariableMYFLT_t      m;
  csCfgVariableString_t     s;
} csCfgVariable_t;

/* types */

#define CSOUNDCFG_INTEGER   1
#define CSOUNDCFG_BOOLEAN   2
#define CSOUNDCFG_FLOAT     3
#define CSOUNDCFG_DOUBLE    4
#define CSOUNDCFG_MYFLT     5
#define CSOUNDCFG_STRING    6

/* flags */

#define CSOUNDCFG_POWOFTWO  0x00000001

/* error codes */

#define CSOUNDCFG_SUCCESS           0
#define CSOUNDCFG_INVALID_NAME      -1
#define CSOUNDCFG_INVALID_TYPE      -2
#define CSOUNDCFG_INVALID_FLAG      -3
#define CSOUNDCFG_NULL_POINTER      -4
#define CSOUNDCFG_TOO_HIGH          -5
#define CSOUNDCFG_TOO_LOW           -6
#define CSOUNDCFG_NOT_POWOFTWO      -7
#define CSOUNDCFG_INVALID_BOOLEAN   -8
#define CSOUNDCFG_MEMORY            -9
#define CSOUNDCFG_STRING_LENGTH     -10

#define CSOUNDCFG_LASTERROR         -10

/* -------- interface functions -------- */

/* This pragma must come before all public function declarations */

  /**
   * This function is similar to csoundCreateGlobalConfigurationVariable(),
   * except it creates a configuration variable specific to Csound instance
   * 'csound', and is suitable for calling from the Csound library
   * (in csoundPreCompile()) or plugins (in csoundModuleCreate()).
   * The other parameters and return value are the same as in the case of
   * csoundCreateGlobalConfigurationVariable().
   */
  PUBLIC int
    csoundCreateConfigurationVariable(CSOUND *csound, const char *name,
                                      void *p, int type, int flags,
                                      void *min, void *max,
                                      const char *shortDesc,
                                      const char *longDesc);

  /**
   * Set the value of a configuration variable of Csound instance 'csound'.
   * The 'name' and 'value' parameters, and return value are the same as
   * in the case of csoundSetGlobalConfigurationVariable().
   */
  PUBLIC int csoundSetConfigurationVariable(CSOUND *csound, const char *name,
                                                            void *value);

  /**
   * Set the value of a configuration variable of Csound instance 'csound',
   * by parsing a string.
   * The 'name' and 'value' parameters, and return value are the same as
   * in the case of csoundParseGlobalConfigurationVariable().
   */
  PUBLIC int csoundParseConfigurationVariable(CSOUND *csound, const char *name,
                                              const char *value);

  /**
   * Return pointer to the configuration variable of Csound instace 'csound'
   * with the specified name.
   * The return value may be NULL if the variable is not found in the database.
   */
  PUBLIC csCfgVariable_t
    *csoundQueryConfigurationVariable(CSOUND *csound, const char *name);

  /**
   * Create an alphabetically sorted list of all configuration variables
   * of Csound instance 'csound'.
   * Returns a pointer to a NULL terminated array of configuration variable
   * pointers, or NULL on error.
   * The caller is responsible for freeing the returned list with
   * csoundDeleteCfgVarList(), however, the variable pointers in the list
   * should not be freed.
   */
  PUBLIC csCfgVariable_t **csoundListConfigurationVariables(CSOUND *csound);

  /**
   * Release a configuration variable list previously returned
   * by csoundListGlobalConfigurationVariables() or
   * csoundListConfigurationVariables().
   */
  PUBLIC void csoundDeleteCfgVarList(CSOUND* csound, csCfgVariable_t **lst);

  /**
   * Remove the configuration variable of Csound instance 'csound' with the
   * specified name from the database. Plugins need not call this, as all
   * configuration variables are automatically deleted by csoundReset().
   * Return value is CSOUNDCFG_SUCCESS in case of success, or
   * CSOUNDCFG_INVALID_NAME if the variable was not found.
   */
  PUBLIC int csoundDeleteConfigurationVariable(CSOUND *csound,
                                               const char *name);
  /**
   * Returns pointer to an error string constant for the specified
   * CSOUNDCFG error code. The string is not translated.
   */
  PUBLIC const char *csoundCfgErrorCodeToString(int errcode);

/* This pragma must come after all public function declarations */

#ifdef __cplusplus
}
#endif

#endif  /* CSOUND_CFGVAR_H */