specfuns.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 80 行

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*                            Open Watcom Project
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#include "plusplus.h"
#include "specfuns.h"

#ifndef NDEBUG
    #include "errdefns.h"
#endif

typedef struct {
    const char* name;
    unsigned length;
} SPEC_FUNC;

#define SPEC_FUN( code, name ) { name, sizeof(name)-1 }

static SPEC_FUNC funs[] = {     // special functions
#include "specfuns.dfn"
};

#define SPEC_FUN_END &funs[ sizeof(funs) / sizeof(funs[0]) ]


SPFN SpecialFunction(           // IDENTIFY SPECIAL FUNCTION
    SYMBOL func )               // - potential special function
{
    SPFN retn;                  // - return: code for that function
    SYMBOL_NAME sn;             // - symbol_name structure
    const char* sname;          // - name of function
    SPEC_FUNC* spp;             // - current definition
    unsigned sname_len;         // - size of name

    DbgVerify( SymIsFunction( func ), "SpecialFunction -- non-function" );
    sn = func->name;
    retn = SPFN_NONE;
    if( sn != NULL && ScopeIsGlobalNameSpace( sn->containing ) != NULL ) {
        sname = sn->name;
        if( sname != NULL ) {
            sname_len = strlen( sname );
            for( spp = SPEC_FUN_END - 1; spp != funs; --spp ) {
                if( spp->name[0] == sname[0]
                 && sname_len == spp->length
                 && 0 == memcmp( spp->name, sname, sname_len ) ) break;
            }
            retn = spp - funs;
        }
    }
    return retn;
}