1 void 2 constant(sv) 3 PREINIT: 4 #ifdef dXSTARG 5 dXSTARG; /* Faster if we have it. */ 6 #else 7 dTARGET; 8 #endif 9 STRLEN len; 10 int type; 11 IV iv; 12 /* NV nv; Uncomment this if you need to return NVs */ 13 /* const char *pv; Uncomment this if you need to return PVs */ 14 INPUT: 15 SV * sv; 16 const char * s = SvPV(sv, len); 17 PPCODE: 18 /* Change this to constant(aTHX_ s, len, &iv, &nv); 19 if you need to return both NVs and IVs */ 20 type = constant(aTHX_ s, len, &iv); 21 /* Return 1 or 2 items. First is error message, or undef if no error. 22 Second, if present, is found value */ 23 switch (type) { 24 case PERL_constant_NOTFOUND: 25 sv = sv_2mortal(newSVpvf("%s is not a valid Bzip2 macro", s)); 26 PUSHs(sv); 27 break; 28 case PERL_constant_NOTDEF: 29 sv = sv_2mortal(newSVpvf( 30 "Your vendor has not defined Bzip2 macro %s, used", s)); 31 PUSHs(sv); 32 break; 33 case PERL_constant_ISIV: 34 EXTEND(SP, 1); 35 PUSHs(&PL_sv_undef); 36 PUSHi(iv); 37 break; 38 /* Uncomment this if you need to return NOs 39 case PERL_constant_ISNO: 40 EXTEND(SP, 1); 41 PUSHs(&PL_sv_undef); 42 PUSHs(&PL_sv_no); 43 break; */ 44 /* Uncomment this if you need to return NVs 45 case PERL_constant_ISNV: 46 EXTEND(SP, 1); 47 PUSHs(&PL_sv_undef); 48 PUSHn(nv); 49 break; */ 50 /* Uncomment this if you need to return PVs 51 case PERL_constant_ISPV: 52 EXTEND(SP, 1); 53 PUSHs(&PL_sv_undef); 54 PUSHp(pv, strlen(pv)); 55 break; */ 56 /* Uncomment this if you need to return PVNs 57 case PERL_constant_ISPVN: 58 EXTEND(SP, 1); 59 PUSHs(&PL_sv_undef); 60 PUSHp(pv, iv); 61 break; */ 62 /* Uncomment this if you need to return SVs 63 case PERL_constant_ISSV: 64 EXTEND(SP, 1); 65 PUSHs(&PL_sv_undef); 66 PUSHs(sv); 67 break; */ 68 /* Uncomment this if you need to return UNDEFs 69 case PERL_constant_ISUNDEF: 70 break; */ 71 /* Uncomment this if you need to return UVs 72 case PERL_constant_ISUV: 73 EXTEND(SP, 1); 74 PUSHs(&PL_sv_undef); 75 PUSHu((UV)iv); 76 break; */ 77 /* Uncomment this if you need to return YESs 78 case PERL_constant_ISYES: 79 EXTEND(SP, 1); 80 PUSHs(&PL_sv_undef); 81 PUSHs(&PL_sv_yes); 82 break; */ 83 default: 84 sv = sv_2mortal(newSVpvf( 85 "Unexpected return type %d while processing Bzip2 macro %s, used", 86 type, s)); 87 PUSHs(sv); 88 } 89