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Annotation of embedaddon/libpdel/structs/type/union.h, revision 1.1.1.1

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: