403 строки
12 KiB
C
403 строки
12 KiB
C
/*
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* ckconfig.c
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*
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* Copyright (C) 1991-1994, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*/
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/*
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* This program is intended to help you determine how to configure the JPEG
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* software for installation on a particular system. The idea is to try to
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* compile and execute this program. If your compiler fails to compile the
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* program, make changes as indicated in the comments below. Once you can
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* compile the program, run it, and it will produce a "jconfig.h" file for
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* your system.
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*
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* As a general rule, each time you try to compile this program,
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* pay attention only to the *first* error message you get from the compiler.
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* Many C compilers will issue lots of spurious error messages once they
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* have gotten confused. Go to the line indicated in the first error message,
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* and read the comments preceding that line to see what to change.
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*
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* Almost all of the edits you may need to make to this program consist of
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* changing a line that reads "#define SOME_SYMBOL" to "#undef SOME_SYMBOL",
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* or vice versa. This is called defining or undefining that symbol.
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*/
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/* First we must see if your system has the include files we need.
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* We start out with the assumption that your system has all the ANSI-standard
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* include files. If you get any error trying to include one of these files,
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* undefine the corresponding HAVE_xxx symbol.
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*/
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#define HAVE_STDDEF_H /* replace 'define' by 'undef' if error here */
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#ifdef HAVE_STDDEF_H /* next line will be skipped if you undef... */
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#include <stddef.h>
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#endif
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#define HAVE_STDLIB_H /* same thing for stdlib.h */
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include <stdio.h> /* If you ain't got this, you ain't got C. */
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/* We have to see if your string functions are defined by
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* strings.h (old BSD convention) or string.h (everybody else).
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* We try the non-BSD convention first; define NEED_BSD_STRINGS
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* if the compiler says it can't find string.h.
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*/
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#undef NEED_BSD_STRINGS
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#ifdef NEED_BSD_STRINGS
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#include <strings.h>
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#else
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#include <string.h>
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#endif
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/* On some systems (especially older Unix machines), type size_t is
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* defined only in the include file <sys/types.h>. If you get a failure
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* on the size_t test below, try defining NEED_SYS_TYPES_H.
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*/
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#undef NEED_SYS_TYPES_H /* start by assuming we don't need it */
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#ifdef NEED_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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/* Usually type size_t is defined in one of the include files we've included
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* above. If not, you'll get an error on the "typedef size_t my_size_t;" line.
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* In that case, first try defining NEED_SYS_TYPES_H just above.
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* If that doesn't work, you'll have to search through your system library
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* to figure out which include file defines "size_t". Look for a line that
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* says "typedef something-or-other size_t;". Then, change the line below
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* that says "#include <someincludefile.h>" to instead include the file
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* you found size_t in, and define NEED_SPECIAL_INCLUDE. If you can't find
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* type size_t anywhere, try replacing "#include <someincludefile.h>" with
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* "typedef unsigned int size_t;".
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*/
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#undef NEED_SPECIAL_INCLUDE /* assume we DON'T need it, for starters */
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#ifdef NEED_SPECIAL_INCLUDE
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#include <someincludefile.h>
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#endif
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typedef size_t my_size_t; /* The payoff: do we have size_t now? */
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/* The next question is whether your compiler supports ANSI-style function
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* prototypes. You need to know this in order to choose between using
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* makefile.ansi and using makefile.unix.
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* The #define line below is set to assume you have ANSI function prototypes.
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* If you get an error in this group of lines, undefine HAVE_PROTOTYPES.
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*/
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#define HAVE_PROTOTYPES
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#ifdef HAVE_PROTOTYPES
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int testfunction (int arg1, int * arg2); /* check prototypes */
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struct methods_struct { /* check method-pointer declarations */
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int (*error_exit) (char *msgtext);
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int (*trace_message) (char *msgtext);
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int (*another_method) (void);
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};
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int testfunction (int arg1, int * arg2) /* check definitions */
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{
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return arg2[arg1];
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}
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int test2function (void) /* check void arg list */
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{
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return 0;
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}
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#endif
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/* Now we want to find out if your compiler knows what "unsigned char" means.
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* If you get an error on the "unsigned char un_char;" line,
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* then undefine HAVE_UNSIGNED_CHAR.
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*/
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#define HAVE_UNSIGNED_CHAR
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#ifdef HAVE_UNSIGNED_CHAR
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unsigned char un_char;
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#endif
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/* Now we want to find out if your compiler knows what "unsigned short" means.
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* If you get an error on the "unsigned short un_short;" line,
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* then undefine HAVE_UNSIGNED_SHORT.
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*/
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#define HAVE_UNSIGNED_SHORT
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#ifdef HAVE_UNSIGNED_SHORT
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unsigned short un_short;
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#endif
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/* Now we want to find out if your compiler understands type "void".
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* If you get an error anywhere in here, undefine HAVE_VOID.
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*/
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#define HAVE_VOID
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#ifdef HAVE_VOID
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/* Caution: a C++ compiler will insist on complete prototypes */
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typedef void * void_ptr; /* check void * */
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#ifdef HAVE_PROTOTYPES /* check ptr to function returning void */
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typedef void (*void_func) (int a, int b);
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#else
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typedef void (*void_func) ();
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#endif
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#ifdef HAVE_PROTOTYPES /* check void function result */
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void test3function (void_ptr arg1, void_func arg2)
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#else
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void test3function (arg1, arg2)
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void_ptr arg1;
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void_func arg2;
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#endif
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{
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char * locptr = (char *) arg1; /* check casting to and from void * */
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arg1 = (void *) locptr;
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(*arg2) (1, 2); /* check call of fcn returning void */
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}
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#endif
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/* Now we want to find out if your compiler knows what "const" means.
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* If you get an error here, undefine HAVE_CONST.
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*/
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#define HAVE_CONST
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#ifdef HAVE_CONST
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static const int carray[3] = {1, 2, 3};
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#ifdef HAVE_PROTOTYPES
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int test4function (const int arg1)
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#else
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int test4function (arg1)
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const int arg1;
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#endif
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{
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return carray[arg1];
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}
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#endif
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/* If you get an error or warning about this structure definition,
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* define INCOMPLETE_TYPES_BROKEN.
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*/
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#undef INCOMPLETE_TYPES_BROKEN
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#ifndef INCOMPLETE_TYPES_BROKEN
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typedef struct undefined_structure * undef_struct_ptr;
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#endif
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/* If you get an error about duplicate names,
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* define NEED_SHORT_EXTERNAL_NAMES.
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*/
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#undef NEED_SHORT_EXTERNAL_NAMES
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#ifndef NEED_SHORT_EXTERNAL_NAMES
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int possibly_duplicate_function ()
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{
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return 0;
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}
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int possibly_dupli_function ()
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{
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return 1;
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}
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#endif
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/************************************************************************
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* OK, that's it. You should not have to change anything beyond this
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* point in order to compile and execute this program. (You might get
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* some warnings, but you can ignore them.)
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* When you run the program, it will make a couple more tests that it
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* can do automatically, and then it will create jconfig.h and print out
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* any additional suggestions it has.
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************************************************************************
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*/
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#ifdef HAVE_PROTOTYPES
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int is_char_signed (int arg)
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#else
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int is_char_signed (arg)
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int arg;
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#endif
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{
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if (arg == 189) { /* expected result for unsigned char */
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return 0; /* type char is unsigned */
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}
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else if (arg != -67) { /* expected result for signed char */
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printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");
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printf("I fear the JPEG software will not work at all.\n\n");
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}
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return 1; /* assume char is signed otherwise */
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}
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#ifdef HAVE_PROTOTYPES
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int is_shifting_signed (long arg)
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#else
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int is_shifting_signed (arg)
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long arg;
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#endif
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/* See whether right-shift on a long is signed or not. */
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{
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long res = arg >> 4;
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if (res == -0x7F7E80CL) { /* expected result for signed shift */
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return 1; /* right shift is signed */
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}
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/* see if unsigned-shift hack will fix it. */
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/* we can't just test exact value since it depends on width of long... */
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res |= (~0L) << (32-4);
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if (res == -0x7F7E80CL) { /* expected result now? */
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return 0; /* right shift is unsigned */
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}
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printf("Right shift isn't acting as I expect it to.\n");
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printf("I fear the JPEG software will not work at all.\n\n");
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return 0; /* try it with unsigned anyway */
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}
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#ifdef HAVE_PROTOTYPES
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int main (int argc, char ** argv)
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#else
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int main (argc, argv)
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int argc;
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char ** argv;
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#endif
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{
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char signed_char_check = (char) (-67);
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FILE *outfile;
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/* Attempt to write jconfig.h */
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if ((outfile = fopen("jconfig.h", "w")) == NULL) {
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printf("Failed to write jconfig.h\n");
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return 1;
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}
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/* Write out all the info */
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fprintf(outfile, "/* jconfig.h --- generated by ckconfig.c */\n");
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fprintf(outfile, "/* see jconfig.doc for explanations */\n\n");
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#ifdef HAVE_PROTOTYPES
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fprintf(outfile, "#define HAVE_PROTOTYPES\n");
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#else
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fprintf(outfile, "#undef HAVE_PROTOTYPES\n");
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#endif
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#ifdef HAVE_UNSIGNED_CHAR
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fprintf(outfile, "#define HAVE_UNSIGNED_CHAR\n");
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#else
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fprintf(outfile, "#undef HAVE_UNSIGNED_CHAR\n");
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#endif
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#ifdef HAVE_UNSIGNED_SHORT
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fprintf(outfile, "#define HAVE_UNSIGNED_SHORT\n");
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#else
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fprintf(outfile, "#undef HAVE_UNSIGNED_SHORT\n");
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#endif
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#ifdef HAVE_VOID
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fprintf(outfile, "/* #define void char */\n");
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#else
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fprintf(outfile, "#define void char\n");
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#endif
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#ifdef HAVE_CONST
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fprintf(outfile, "/* #define const */\n");
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#else
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fprintf(outfile, "#define const\n");
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#endif
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if (is_char_signed((int) signed_char_check))
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fprintf(outfile, "#undef CHAR_IS_UNSIGNED\n");
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else
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fprintf(outfile, "#define CHAR_IS_UNSIGNED\n");
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#ifdef HAVE_STDDEF_H
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fprintf(outfile, "#define HAVE_STDDEF_H\n");
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#else
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fprintf(outfile, "#undef HAVE_STDDEF_H\n");
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#endif
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#ifdef HAVE_STDLIB_H
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fprintf(outfile, "#define HAVE_STDLIB_H\n");
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#else
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fprintf(outfile, "#undef HAVE_STDLIB_H\n");
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#endif
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#ifdef NEED_BSD_STRINGS
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fprintf(outfile, "#define NEED_BSD_STRINGS\n");
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#else
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fprintf(outfile, "#undef NEED_BSD_STRINGS\n");
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#endif
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#ifdef NEED_SYS_TYPES_H
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fprintf(outfile, "#define NEED_SYS_TYPES_H\n");
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#else
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fprintf(outfile, "#undef NEED_SYS_TYPES_H\n");
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#endif
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fprintf(outfile, "#undef NEED_FAR_POINTERS\n");
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#ifdef NEED_SHORT_EXTERNAL_NAMES
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fprintf(outfile, "#define NEED_SHORT_EXTERNAL_NAMES\n");
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#else
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fprintf(outfile, "#undef NEED_SHORT_EXTERNAL_NAMES\n");
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#endif
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#ifdef INCOMPLETE_TYPES_BROKEN
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fprintf(outfile, "#define INCOMPLETE_TYPES_BROKEN\n");
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#else
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fprintf(outfile, "#undef INCOMPLETE_TYPES_BROKEN\n");
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#endif
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fprintf(outfile, "\n#ifdef JPEG_INTERNALS\n\n");
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if (is_shifting_signed(-0x7F7E80B1L))
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fprintf(outfile, "#undef RIGHT_SHIFT_IS_UNSIGNED\n");
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else
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fprintf(outfile, "#define RIGHT_SHIFT_IS_UNSIGNED\n");
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fprintf(outfile, "\n#endif /* JPEG_INTERNALS */\n");
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fprintf(outfile, "\n#ifdef JPEG_CJPEG_DJPEG\n\n");
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fprintf(outfile, "#define BMP_SUPPORTED /* BMP image file format */\n");
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fprintf(outfile, "#define GIF_SUPPORTED /* GIF image file format */\n");
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fprintf(outfile, "#define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */\n");
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fprintf(outfile, "#undef RLE_SUPPORTED /* Utah RLE image file format */\n");
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fprintf(outfile, "#define TARGA_SUPPORTED /* Targa image file format */\n\n");
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fprintf(outfile, "#undef TWO_FILE_COMMANDLINE /* You may need this on non-Unix systems */\n");
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fprintf(outfile, "#undef NEED_SIGNAL_CATCHER /* Define this if you use jmemname.c */\n");
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fprintf(outfile, "#undef DONT_USE_B_MODE\n");
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fprintf(outfile, "/* #define PROGRESS_REPORT */ /* optional */\n");
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fprintf(outfile, "\n#endif /* JPEG_CJPEG_DJPEG */\n");
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/* Close the jconfig.h file */
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fclose(outfile);
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/* User report */
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printf("Configuration check for Independent JPEG Group's software done.\n");
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printf("\nI have written the jconfig.h file for you.\n\n");
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#ifdef HAVE_PROTOTYPES
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printf("You should use makefile.ansi as the starting point for your Makefile.\n");
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#else
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printf("You should use makefile.unix as the starting point for your Makefile.\n");
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#endif
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#ifdef NEED_SPECIAL_INCLUDE
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printf("\nYou'll need to change jconfig.h to include the system include file\n");
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printf("that you found type size_t in, or add a direct definition of type\n");
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printf("size_t if that's what you used. Just add it to the end.\n");
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#endif
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return 0;
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}
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