mirror of https://github.com/mpv-player/mpv
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
#ifndef MPLAYER_M_STRUCT_H
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#define MPLAYER_M_STRUCT_H
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/// \defgroup OptionsStruct Options struct
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/// \ingroup Options
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/// An API to manipulate structs using m_option.
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///@{
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/// \file m_struct.h
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struct m_option;
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/// Struct definition
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typedef struct m_struct_st {
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/// For error messages and debugging
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const char* name;
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/// size of the whole struct
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unsigned int size;
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/// Pointer to a struct filled with the default settings
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const void* defaults;
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/// Field list.
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/** The p field of the \ref m_option struct must contain the offset
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* of the member in the struct (use M_ST_OFF macro for this).
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*/
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const struct m_option* fields;
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} m_struct_t;
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// From glib.h (modified ;-)
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/// Get the offset of a struct field.
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/** \param struct_type Struct type.
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* \param member Name of the field.
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* \return The offset of the field in bytes.
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*/
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#define M_ST_OFF(struct_type, member) \
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((void*) &((struct_type*) 0)->member)
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/// Get a pointer to a struct field.
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/** \param struct_p Pointer to the struct.
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* \param struct_offset Offset of the field in the struct.
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* \return Pointer to the struct field.
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*/
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#define M_ST_MB_P(struct_p, struct_offset) \
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((void *)((char *)(struct_p) + (unsigned long)(struct_offset)))
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/// Access a struct field at a given offset.
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/** \param member_type Type of the field.
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* \param struct_p Pointer to the struct.
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* \param struct_offset Offset of the field in the struct.
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* \return The struct field at the given offset.
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*/
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#define M_ST_MB(member_type, struct_p, struct_offset) \
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(*(member_type*) M_ST_MB_P ((struct_p), (struct_offset)))
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/// Allocate the struct and set it to the defaults.
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/** \param st Struct definition.
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* \return The newly allocated object set to default.
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*/
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void*
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m_struct_alloc(const m_struct_t* st);
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/// Set a field of the struct.
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/** \param st Struct definition.
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* \param obj Pointer to the struct to set.
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* \param field Name of the field to set.
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* \param param New value of the field.
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* \return 0 on error, 1 on success.
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*/
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int
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m_struct_set(const m_struct_t* st, void* obj, char* field, char* param);
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/// Reset a field (or all if field == NULL) to defaults.
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/** \param st Struct definition.
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* \param obj Pointer to the struct to set.
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* \param field Name of the field to reset, if NULL all fields are reseted.
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*/
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void
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m_struct_reset(const m_struct_t* st, void* obj, const char* field);
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/// Create a copy of an existing struct.
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/** \param st Struct definition.
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* \param obj Pointer to the struct to copy.
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* \return Newly allocated copy of obj.
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*/
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void*
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m_struct_copy(const m_struct_t* st, void* obj);
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/// Free an allocated struct.
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/** \param st Struct definition.
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* \param obj Pointer to the struct to copy.
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*/
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void
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m_struct_free(const m_struct_t* st, void* obj);
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/// Get a field description.
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/** \param st Struct definition.
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* \param f Name of the field.
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* \return The \ref m_option struct describing the field or NULL if not found.
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*/
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const struct m_option*
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m_struct_get_field(const m_struct_t* st,const char* f);
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///@}
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#endif /* MPLAYER_M_STRUCT_H */
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