sysconf.c

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#ifdef	_POSIX2_LOCALEDEF
      return _POSIX2_LOCALEDEF;
#else
      RETURN_NEG_1;
#endif

    case _SC_2_SW_DEV:
#ifdef	_POSIX2_SW_DEV
      return _POSIX2_SW_DEV;
#else
      RETURN_NEG_1;
#endif

    case _SC_2_CHAR_TERM:
#ifdef	_POSIX2_CHAR_TERM
      return _POSIX2_CHAR_TERM;
#else
      RETURN_NEG_1;
#endif

    case _SC_2_UPE:
#ifdef	_POSIX2_UPE
      return _POSIX2_UPE;
#else
      RETURN_NEG_1;
#endif

      /* POSIX 1003.1c (POSIX Threads).  */
    case _SC_THREADS:
#ifdef	_POSIX_THREADS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_SAFE_FUNCTIONS:
#ifdef	_POSIX_THREAD_SAFE_FUNCTIONS
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_GETGR_R_SIZE_MAX:
#ifdef	NSS_BUFLEN_GROUP
      return NSS_BUFLEN_GROUP;
#else
      RETURN_NEG_1;
#endif

    case _SC_GETPW_R_SIZE_MAX:
#ifdef	NSS_BUFLEN_PASSWD
      return NSS_BUFLEN_PASSWD;
#else
      RETURN_NEG_1;
#endif

    case _SC_LOGIN_NAME_MAX:
#ifdef	_POSIX_LOGIN_NAME_MAX
      return _POSIX_LOGIN_NAME_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_TTY_NAME_MAX:
#ifdef	_POSIX_TTY_NAME_MAX
      return _POSIX_TTY_NAME_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_DESTRUCTOR_ITERATIONS:
#ifdef	_POSIX_THREAD_DESTRUCTOR_ITERATIONS
      return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_KEYS_MAX:
#ifdef	PTHREAD_KEYS_MAX
      return PTHREAD_KEYS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_STACK_MIN:
#ifdef	PTHREAD_STACK_MIN
      return PTHREAD_STACK_MIN;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_THREADS_MAX:
#ifdef	PTHREAD_THREADS_MAX
      return PTHREAD_THREADS_MAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_ATTR_STACKADDR:
#ifdef	_POSIX_THREAD_ATTR_STACKADDR
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_ATTR_STACKSIZE:
#ifdef	_POSIX_THREAD_ATTR_STACKSIZE
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_PRIORITY_SCHEDULING:
#ifdef	_POSIX_THREAD_PRIORITY_SCHEDULING
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_PRIO_INHERIT:
#ifdef	_POSIX_THREAD_PRIO_INHERIT
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_PRIO_PROTECT:
#ifdef	_POSIX_THREAD_PRIO_PROTECT
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_THREAD_PROCESS_SHARED:
#ifdef	_POSIX_THREAD_PROCESS_SHARED
      return 1;
#else
      RETURN_NEG_1;
#endif

    case _SC_NPROCESSORS_CONF:
#if 0
      RETURN_FUNCTION(get_nprocs_conf());
#else
      RETURN_NEG_1;
#endif

    case _SC_NPROCESSORS_ONLN:
#if 0
      RETURN_FUNCTION(get_nprocs());
#else
      RETURN_NEG_1;
#endif

    case _SC_PHYS_PAGES:
#if 0
      RETURN_FUNCTION(get_phys_pages());
#else
      RETURN_NEG_1;
#endif

    case _SC_AVPHYS_PAGES:
#if 0
      RETURN_FUNCTION(get_avphys_pages());
#else
      RETURN_NEG_1;
#endif

    case _SC_ATEXIT_MAX:
      return __UCLIBC_MAX_ATEXIT;

    case _SC_PASS_MAX:
      /* We have no limit but since the return value might be used to
	 allocate a buffer we restrict the value.  */
      return BUFSIZ;

    case _SC_XOPEN_VERSION:
      return _XOPEN_VERSION;

    case _SC_XOPEN_XCU_VERSION:
      return _XOPEN_XCU_VERSION;

    case _SC_XOPEN_UNIX:
      return _XOPEN_UNIX;

    case _SC_XOPEN_CRYPT:
#ifdef	_XOPEN_CRYPT
      return _XOPEN_CRYPT;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_ENH_I18N:
#ifdef	_XOPEN_ENH_I18N
      return _XOPEN_ENH_I18N;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_SHM:
#ifdef	_XOPEN_SHM
      return _XOPEN_SHM;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_XPG2:
#ifdef	_XOPEN_XPG2
      return _XOPEN_XPG2;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_XPG3:
#ifdef	_XOPEN_XPG3
      return _XOPEN_XPG3;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_XPG4:
#ifdef	_XOPEN_XPG4
      return _XOPEN_XPG4;
#else
      RETURN_NEG_1;
#endif

    case _SC_CHAR_BIT:
      return CHAR_BIT;

    case _SC_CHAR_MAX:
      return CHAR_MAX;

    case _SC_CHAR_MIN:
      return CHAR_MIN;

    case _SC_INT_MAX:
      return INT_MAX;

    case _SC_INT_MIN:
      return INT_MIN;

    case _SC_LONG_BIT:
      return sizeof (long int) * CHAR_BIT;

    case _SC_WORD_BIT:
      return sizeof (int) * CHAR_BIT;

    case _SC_MB_LEN_MAX:
      return MB_LEN_MAX;

    case _SC_NZERO:
      return NZERO;

    case _SC_SSIZE_MAX:
      return _POSIX_SSIZE_MAX;

    case _SC_SCHAR_MAX:
      return SCHAR_MAX;

    case _SC_SCHAR_MIN:
      return SCHAR_MIN;

    case _SC_SHRT_MAX:
      return SHRT_MAX;

    case _SC_SHRT_MIN:
      return SHRT_MIN;

    case _SC_UCHAR_MAX:
      return UCHAR_MAX;

    case _SC_UINT_MAX:
      return UINT_MAX;

    case _SC_ULONG_MAX:
      return ULONG_MAX;

    case _SC_USHRT_MAX:
      return USHRT_MAX;

    case _SC_NL_ARGMAX:
#ifdef	NL_ARGMAX
      return NL_ARGMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_NL_LANGMAX:
#ifdef	NL_LANGMAX
      return NL_LANGMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_NL_MSGMAX:
#ifdef	NL_MSGMAX
      return NL_MSGMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_NL_NMAX:
#ifdef	NL_NMAX
      return NL_NMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_NL_SETMAX:
#ifdef	NL_SETMAX
      return NL_SETMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_NL_TEXTMAX:
#ifdef	NL_TEXTMAX
      return NL_TEXTMAX;
#else
      RETURN_NEG_1;
#endif

    case _SC_XBS5_ILP32_OFF32:
#ifdef _XBS5_ILP32_OFF32
      return _XBS5_ILP32_OFF32;
#else
      RETURN_NEG_1;
#endif
    case _SC_XBS5_ILP32_OFFBIG:
#ifdef _XBS5_ILP32_OFFBIG
      return _XBS5_ILP32_OFFBIG;
#else
      RETURN_NEG_1;
#endif
    case _SC_XBS5_LP64_OFF64:
#ifdef _XBS5_LP64_OFF64
      return _XBS5_LP64_OFF64;
#else
      RETURN_NEG_1;
#endif
    case _SC_XBS5_LPBIG_OFFBIG:
#ifdef _XBS5_LPBIG_OFFBIG
      return _XBS5_LPBIG_OFFBIG;
#else
      RETURN_NEG_1;
#endif

    case _SC_XOPEN_LEGACY:
      return _XOPEN_LEGACY;

    case _SC_XOPEN_REALTIME:
#ifdef _XOPEN_REALTIME
      return _XOPEN_REALTIME;
#else
      RETURN_NEG_1;
#endif
    case _SC_XOPEN_REALTIME_THREADS:
#ifdef _XOPEN_REALTIME_THREADS
      return _XOPEN_REALTIME_THREADS;
#else
      RETURN_NEG_1;
#endif
    }
}
weak_alias(__sysconf, sysconf);

#endif /* _UCLIBC_GENERATE_SYSCONF_MAIN */
/***********************************************************************/
#ifdef _UCLIBC_GENERATE_SYSCONF_MAIN

static long int ret_vals[_UCLIBC_SYSCONF_NUM_VALID_ARGS];

static const char *type_str[] = {
	"char", "short", "int", "long"
};

static const char *type_fmt[] = { " %4ld", " %6ld", " %8ld", " %8ld" };
static const int type_mod[] = { 13, 9, 6, 6 };

static int find_or_add_in_table(int index, long int val, int *table, 
								int *num_in_table, int add_flag)
{
	int i;

	for (i=0 ; i<*num_in_table ; i++) {
		if (ret_vals[table[i]] == val) {
			return i;
		}
	}
	if (add_flag) {
		table[(*num_in_table)++] = index;
		return i;
	} else {
		return -1;
	}
}


int main(void)
{
	long int r;
	int type_table[5][_UCLIBC_SYSCONF_NUM_VALID_ARGS];
	int ret_type[_UCLIBC_SYSCONF_NUM_VALID_ARGS];
	int num_type[5];
	int i, j, k, code;

	for (i=0 ; i<5 ; i++) {
		num_type[i] = 0;
	}

	for (i=0; i<_UCLIBC_SYSCONF_NUM_VALID_ARGS ; i++) {
		__set_errno(0);
		r = ret_vals[i] = sysconf(i);
		switch(errno) {
			case EINVAL:		/* we're missing a case! */
				fprintf(stderr,"sysconf.c is broken! case %d missing!\n", i);
				return EXIT_FAILURE;
			case EISNAM:		/* function */
				find_or_add_in_table(i,r,type_table[4],num_type+4,1);
				ret_type[i] = 4;
				break;
			case ENOSYS:		/* defaults to -1 */
				/* why does this break for shared???? */
				fprintf(stderr,"gen_sysconf advisory --"
						"case %d defaults to -1\n", i);
				/* fall through */
			case 0:
				if ((r>=CHAR_MIN) && (r<=CHAR_MAX)) {
					ret_type[i] = 0;
					find_or_add_in_table(i,r,type_table[0],num_type+0,1);
				} else if ((r>=SHRT_MIN) && (r<=SHRT_MAX)) {
					ret_type[i] = 1;
					find_or_add_in_table(i,r,type_table[1],num_type+1,1);
				} else if ((r>=INT_MIN) && (r<=INT_MAX)) {
					ret_type[i] = 2;
					find_or_add_in_table(i,r,type_table[2],num_type+2,1);
				} else {
					ret_type[i] = 3;
					find_or_add_in_table(i,r,type_table[3],num_type+3,1);
				}
				break;
			default:
				fprintf(stderr,"sysconf.c is broken! errno = %d!\n", errno);
				break;
		}
	}

	printf("#include <errno.h>\n#include <unistd.h>\n#include <limits.h>\n\n");

	printf("static const unsigned char index[%d] = {",
		   _UCLIBC_SYSCONF_NUM_VALID_ARGS);
	for (i=0 ; i<_UCLIBC_SYSCONF_NUM_VALID_ARGS ; i++) {
		if (i) printf(",");
		if (i%15 == 0) printf("\n");
		code = 0;
		for (j=0 ; j<4 ; j++) {
			k = find_or_add_in_table(i,ret_vals[i],type_table[j],num_type+j,0);
			if (k>=0) {
				code += k;
				break;
			}
			code += num_type[j];
		}
		printf(" %3d", code);
	}
	printf("\n};\n\n");

	for (j=0 ; j < 4 ; j++) {
		if (num_type[j]) {
			printf("static const %s %s_vals[%d] = {",
				   type_str[j], type_str[j], num_type[j]);
			for (i = 0 ; i<num_type[j] ; i++) {
				if (i) printf(",");
				if (i%13 == 0) printf("\n");
				if (ret_vals[type_table[j][i]] == INT_MIN) {
					printf("%12s","INT_MIN");
				} else {
					printf(type_fmt[j], ret_vals[type_table[j][i]]);
				}

			}
			printf("\n};\n\n");
		}
	}

	printf("long int sysconf(int name)\n{\n\tint i;\n\n"
		   "\tif ((name < 0) || (name >= %d)) {\n"
		   "\t\terrno=EINVAL;\n"
		   "\t\treturn -1;\n"
		   "\t}\n\n", _UCLIBC_SYSCONF_NUM_VALID_ARGS);

	printf("\ti = index[name];\n\n");
	k = 0;
	for (i=0 ; i<4 ; i++) {
		if (num_type[i]) {
			if (k>0) {
				printf("\ti -= %d;\n", k);
			}
			printf("\tif (i < %d) {\n"
				   "\t\treturn %s_vals[i];\n"
				   "\t}\n\n",
				   num_type[i], type_str[i]);
			k = num_type[i];
		}
	}

	if (num_type[4]) {
		if (k>0) {
			printf("\ti -= %d;\n", k);
		}
		printf("\tswitch(i) {\n");
		for (i = 0 ; i<num_type[4] ; i++) {
			printf("\t\tcase %d:\n"
				   "\t\t\treturn %s;\n",
				   i, (const char *)ret_vals[type_table[4][i]]);
		}
		printf("\t}\n\n");
	}

	printf("\treturn -1;\n"
		   "}\n");


	return EXIT_SUCCESS;
}
/***********************************************************************/
#endif