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Annotation of embedaddon/libpdel/structs/type/union.h, revision 1.1

1.1     ! misho       1: 
        !             2: /*
        !             3:  * Copyright (c) 2001-2002 Packet Design, LLC.
        !             4:  * All rights reserved.
        !             5:  * 
        !             6:  * Subject to the following obligations and disclaimer of warranty,
        !             7:  * use and redistribution of this software, in source or object code
        !             8:  * forms, with or without modifications are expressly permitted by
        !             9:  * Packet Design; provided, however, that:
        !            10:  * 
        !            11:  *    (i)  Any and all reproductions of the source or object code
        !            12:  *         must include the copyright notice above and the following
        !            13:  *         disclaimer of warranties; and
        !            14:  *    (ii) No rights are granted, in any manner or form, to use
        !            15:  *         Packet Design trademarks, including the mark "PACKET DESIGN"
        !            16:  *         on advertising, endorsements, or otherwise except as such
        !            17:  *         appears in the above copyright notice or in the software.
        !            18:  * 
        !            19:  * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
        !            20:  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
        !            21:  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
        !            22:  * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
        !            23:  * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
        !            24:  * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
        !            25:  * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
        !            26:  * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
        !            27:  * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
        !            28:  * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
        !            29:  * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
        !            30:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
        !            31:  * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
        !            32:  * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
        !            33:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
        !            35:  * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
        !            36:  * THE POSSIBILITY OF SUCH DAMAGE.
        !            37:  *
        !            38:  * Author: Archie Cobbs <archie@freebsd.org>
        !            39:  */
        !            40: 
        !            41: #ifndef _PDEL_STRUCTS_TYPE_UNION_H_
        !            42: #define _PDEL_STRUCTS_TYPE_UNION_H_
        !            43: 
        !            44: /*********************************************************************
        !            45:                        UNION TYPES
        !            46: *********************************************************************/
        !            47: 
        !            48: /*
        !            49:  * Union type.
        !            50:  *
        !            51:  * The data must be a 'struct structs_union', or a structure
        !            52:  * defined using the DEFINE_STRUCTS_UNION() macro.
        !            53:  */
        !            54: struct structs_union {
        !            55: #ifdef __cplusplus
        !            56:        const char      *field_name;            /* name of field in use */
        !            57: #else
        !            58:        const char      *const field_name;      /* name of field in use */
        !            59: #endif
        !            60:        void            *un;                    /* pointer to field contents */
        !            61: };
        !            62: 
        !            63: /*
        !            64:  * Use this to get the 'un' field declared having the correct type.
        !            65:  */
        !            66: #ifdef __cplusplus
        !            67: #define DEFINE_STRUCTS_UNION(sname, uname)                             \
        !            68: struct sname {                                                         \
        !            69:        const char      *field_name;        /* name of field in use */  \
        !            70:        union uname     *un;                /* pointer to the field */  \
        !            71: }
        !            72: #else
        !            73: #define DEFINE_STRUCTS_UNION(sname, uname)                             \
        !            74: struct sname {                                                         \
        !            75:        const char      *const field_name;  /* name of field in use */  \
        !            76:        union uname     *un;                /* pointer to the field */  \
        !            77: }
        !            78: #endif
        !            79: 
        !            80: /* This structure describes one field in a union */
        !            81: struct structs_ufield {
        !            82:        const char                      *name;          /* name of field */
        !            83:        const struct structs_type       *type;          /* type of field */
        !            84:        char                            *dummy;         /* for type checking */
        !            85: };
        !            86: 
        !            87: /* Use this macro to initialize a 'struct structs_ufield' */
        !            88: #define STRUCTS_UNION_FIELD(fname, ftype)                              \
        !            89:        { #fname, ftype, NULL }
        !            90: 
        !            91: /* This macro terminates a list of 'struct structs_ufield' structures */
        !            92: #define STRUCTS_UNION_FIELD_END                { NULL, NULL, NULL }
        !            93: 
        !            94: __BEGIN_DECLS
        !            95: 
        !            96: /*
        !            97:  * Union type
        !            98:  *
        !            99:  * Type-specific arguments:
        !           100:  *     [const struct structs_ufield *] List of union fields, terminated
        !           101:  *                                         by entry with name == NULL.
        !           102:  *     [const char *]                  Memory allocation type for "un"
        !           103:  */
        !           104: extern structs_init_t          structs_union_init;
        !           105: extern structs_copy_t          structs_union_copy;
        !           106: extern structs_equal_t         structs_union_equal;
        !           107: extern structs_encode_t                structs_union_encode;
        !           108: extern structs_decode_t                structs_union_decode;
        !           109: extern structs_uninit_t                structs_union_free;
        !           110: 
        !           111: #define STRUCTS_UNION_TYPE(uname, flist) {                             \
        !           112:        sizeof(struct structs_union),                                   \
        !           113:        "union",                                                        \
        !           114:        STRUCTS_TYPE_UNION,                                             \
        !           115:        structs_union_init,                                             \
        !           116:        structs_union_copy,                                             \
        !           117:        structs_union_equal,                                            \
        !           118:        structs_notsupp_ascify,                                         \
        !           119:        structs_notsupp_binify,                                         \
        !           120:        structs_union_encode,                                           \
        !           121:        structs_union_decode,                                           \
        !           122:        structs_union_free,                                             \
        !           123:        { { (void *)(flist) }, { (void *)("union " #uname) }, { NULL } }\
        !           124: }
        !           125: 
        !           126: /* Functions */
        !           127: extern int     structs_union_set(const struct structs_type *type,
        !           128:                        const char *name, void *data, const char *field_name);
        !           129: 
        !           130: __END_DECLS
        !           131: 
        !           132: #endif /* _PDEL_STRUCTS_TYPE_UNION_H_ */
        !           133: