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316 lines
7.8 KiB
C
316 lines
7.8 KiB
C
/*
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!!DESCRIPTION!! C-Manual Chapter 8.5: Structure and Union declarations
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!!ORIGIN!! LCC 4.1 Testsuite
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!!LICENCE!! own, freely distributeable for non-profit. read CPYRIGHT.LCC
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*/
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#include "common.h"
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struct defs {
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int cbits; /* No. of bits per char */
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int ibits; /* int */
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int sbits; /* short */
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int lbits; /* long */
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int ubits; /* unsigned */
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int fbits; /* float */
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int dbits; /* double */
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#ifndef NO_FLOATS
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float fprec; /* Smallest number that can be */
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float dprec; /* significantly added to 1. */
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#endif
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int flgs; /* Print return codes, by section */
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int flgm; /* Announce machine dependencies */
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int flgd; /* give explicit diagnostics */
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int flgl; /* Report local return codes. */
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int rrc; /* recent return code */
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int crc; /* Cumulative return code */
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char rfs[8]; /* Return from section */
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};
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int lbits; /* long */
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int ubits; /* unsigned */
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int fbits; /* float */
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int dbits; /* double */
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#ifndef NO_FLOATS
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float fprec; /* Smallest number that can be */
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float dprec; /* significantly added to 1. */
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#endif
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int flgs; /* Print return codes, by section */
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int flgm; /* Announce machine dependencies */
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int flgd; /* give explicit diagnostics */
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int flgl; /* Report local return codes. */
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int rrc; /* recent return code */
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int crc; /* Cumulative return code */
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char rfs[8]; /* Return from section */
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#ifndef NO_OLD_FUNC_DECL
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s85(pd0) /* 8.5 Structure and union declarations */
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struct defs *pd0;
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{
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#else
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int s85(struct defs *pd0){
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#endif
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static char s85er[] = "s85,er%d\n";
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static char qs85[8] = "s85 ";
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int rc;
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char *ps, *pt;
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struct tnode {
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char tword[20];
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int count;
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struct tnode *left;
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struct tnode *right;
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};
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struct tnode s1, s2, *sp;
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struct{
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char cdummy;
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char c;
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} sc;
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struct{
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char cdummy;
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short s;
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} ss;
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struct{
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char cdummy;
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int i;
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} si;
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struct{
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char cdummy;
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long l;
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} sl;
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struct{
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char cdummy;
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unsigned u;
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} su;
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struct{
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char cdummy;
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#ifndef NO_FLOATS
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float f;
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#else
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signed f;
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#endif
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} sf;
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struct{
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char cdummy;
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#ifndef NO_FLOATS
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double d;
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#else
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signed d;
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#endif
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} sd;
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int diff[7], j;
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static char *type[] = {
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"char",
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"short",
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"int",
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"long",
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"unsigned",
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#ifdef NO_FLOATS
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"signed",
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"signed",
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#else
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"float",
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"double"
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#endif
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};
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static char aln[] = " alignment: ";
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#ifndef NO_BITFIELDS
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struct{
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int twobit:2;
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int :1;
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int threebit:3;
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int onebit:1;
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} s3;
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#else
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struct{
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unsigned char twobit;
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unsigned char threebit;
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unsigned char onebit;
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} s3;
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#endif
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union{
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char u1[30];
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short u2[30];
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int u3[30];
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long u4[30];
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unsigned u5[30];
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#ifndef NO_FLOATS
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float u6[30];
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double u7[30];
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#else
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signed u6[30];
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signed u7[30];
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#endif
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} u0;
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ps = qs85;
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pt = pd0->rfs;
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rc = 0;
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while (*pt++ = *ps++);
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/* Within a structure, the objects declared have
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addresses which increase as their declarations are
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read left to right.
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*/
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if( (char *)&s1.count - &s1.tword[0] <= 0
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||(char *)&s1.left - (char *)&s1.count <= 0
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||(char *)&s1.right - (char *)&s1.left <= 0){
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if(pd0->flgd != 0) printf(s85er,1);
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rc = rc+1;
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}
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/* Each non-field member of a structure begins on an
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addressing boundary appropriate to its type.
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*/
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diff[0] = &sc.c - &sc.cdummy;
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diff[1] = (char *)&ss.s - &ss.cdummy;
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diff[2] = (char *)&si.i - &si.cdummy;
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diff[3] = (char *)&sl.l - &sl.cdummy;
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diff[4] = (char *)&su.u - &su.cdummy;
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diff[5] = (char *)&sf.f - &sf.cdummy;
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diff[6] = (char *)&sd.d - &sd.cdummy;
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if(pd0->flgm != 0)
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for(j=0; j<7; j++)
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printf("%s%s%d\n",type[j],aln,diff[j]);
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/* Field specifications are highly implementation de-
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pendent. About the only thing we can do here is to
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check is that the compiler accepts the field constructs,
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and that they seem to work, after a fashion, at
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run time...
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*/
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s3.threebit = 7;
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s3.twobit = s3.threebit;
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s3.threebit = s3.twobit;
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if(s3.threebit != 3){
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if(s3.threebit == -1){
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if(pd0->flgm != 0) printf("Sign extension in fields\n");
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}
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else{
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#ifdef NO_BITFIELDS
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if(pd0->flgd != 0) printf("NO_BITFIELDS\n");
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#else
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if(pd0->flgd != 0) printf(s85er,2);
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rc = rc+2;
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#endif
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}
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}
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s3.onebit = 1;
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if(s3.onebit != 1){
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if(pd0->flgm != 0)
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printf("Be especially careful with 1-bit fields!\n");
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}
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/* A union may be thought of as a structure all of whose
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members begin at offset 0 and whose size is sufficient
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to contain any of its members.
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*/
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if( (char *)u0.u1 - (char *)&u0 != 0
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||(char *)u0.u2 - (char *)&u0 != 0
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||(char *)u0.u3 - (char *)&u0 != 0
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||(char *)u0.u4 - (char *)&u0 != 0
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||(char *)u0.u5 - (char *)&u0 != 0
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||(char *)u0.u6 - (char *)&u0 != 0
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||(char *)u0.u7 - (char *)&u0 != 0){
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if(pd0->flgd != 0) printf(s85er,4);
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rc = rc+4;
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}
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if( sizeof u0 < sizeof u0.u1
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||sizeof u0 < sizeof u0.u2
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||sizeof u0 < sizeof u0.u3
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||sizeof u0 < sizeof u0.u4
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||sizeof u0 < sizeof u0.u5
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||sizeof u0 < sizeof u0.u6
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||sizeof u0 < sizeof u0.u7){
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if(pd0->flgd != 0) printf(s85er,8);
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rc = rc+8;
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}
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/* Finally, we check that the pointers work. */
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s1.right = &s2;
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s2.tword[0] = 2;
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s1.right->tword[0] += 1;
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if(s2.tword[0] != 3){
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if(pd0->flgd != 0) printf(s85er,16);
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rc = rc+16;
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}
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return rc;
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}
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#ifdef NO_LOCAL_PROTOTYPES
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int one();
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#endif
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/*********************************************************************************************
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the main loop that launches the sections
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*********************************************************************************************/
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#ifndef NO_TYPELESS_STRUCT_PTR
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int section(int j,struct* pd0){
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#else
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int section(int j,void* pd0){
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#endif
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switch(j){
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case 0: return s85(pd0);
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}
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}
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#define cq_sections 1
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/*
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C REFERENCE MANUAL (main)
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*/
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#ifndef NO_OLD_FUNC_DECL
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main(n,args)
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int n;
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char **args;
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{
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#else
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int main(int n,char **args) {
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#endif
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int j;
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static struct defs d0, *pd0;
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d0.flgs = 1; /* These flags dictate */
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d0.flgm = 1; /* the verbosity of */
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d0.flgd = 1; /* the program. */
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d0.flgl = 1;
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pd0 = &d0;
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for (j=0; j<cq_sections; j++) {
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d0.rrc=section(j,pd0);
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d0.crc=d0.crc+d0.rrc;
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if(d0.flgs != 0) printf("Section %s returned %d.\n",d0.rfs,d0.rrc);
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}
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if(d0.crc == 0) printf("\nNo errors detected.\n");
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else printf("\nFailed.\n");
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return d0.crc;
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}
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