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402 lines
12 KiB
402 lines
12 KiB
/* |
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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.txt 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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