/*

* ckconfig.c

*

* Copyright (C) 1991-1994, Thomas G. Lane.

* This file is part of the Independent JPEG Group's software.

* For conditions of distribution and use, see the accompanying README file.

*/

/*

* This program is intended to help you determine how to configure the JPEG

* software for installation on a particular system. The idea is to try to

* compile and execute this program. If your compiler fails to compile the

* program, make changes as indicated in the comments below. Once you can

* compile the program, run it, and it will produce a "jconfig.h" file for

* your system.

*

* As a general rule, each time you try to compile this program,

* pay attention only to the *first* error message you get from the compiler.

* Many C compilers will issue lots of spurious error messages once they

* have gotten confused. Go to the line indicated in the first error message,

* and read the comments preceding that line to see what to change.

*

* Almost all of the edits you may need to make to this program consist of

* changing a line that reads "#define SOME_SYMBOL" to "#undef SOME_SYMBOL",

* or vice versa. This is called defining or undefining that symbol.

*/

/* First we must see if your system has the include files we need.

* We start out with the assumption that your system has all the ANSI-standard

* include files. If you get any error trying to include one of these files,

* undefine the corresponding HAVE_xxx symbol.

*/

#define HAVE_STDDEF_H /* replace 'define' by 'undef' if error here */

#ifdef HAVE_STDDEF_H /* next line will be skipped if you undef... */

#include <stddef.h>

#endif

#define HAVE_STDLIB_H /* same thing for stdlib.h */

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#include <stdio.h> /* If you ain't got this, you ain't got C. */

/* We have to see if your string functions are defined by

* strings.h (old BSD convention) or string.h (everybody else).

* We try the non-BSD convention first; define NEED_BSD_STRINGS

* if the compiler says it can't find string.h.

*/

#undef NEED_BSD_STRINGS

#ifdef NEED_BSD_STRINGS

#include <strings.h>

#else

#include <string.h>

#endif

/* On some systems (especially older Unix machines), type size_t is

* defined only in the include file <sys/types.h>. If you get a failure

* on the size_t test below, try defining NEED_SYS_TYPES_H.

*/

#undef NEED_SYS_TYPES_H /* start by assuming we don't need it */

#ifdef NEED_SYS_TYPES_H

#include <sys/types.h>

#endif

/* Usually type size_t is defined in one of the include files we've included

* above. If not, you'll get an error on the "typedef size_t my_size_t;" line.

* In that case, first try defining NEED_SYS_TYPES_H just above.

* If that doesn't work, you'll have to search through your system library

* to figure out which include file defines "size_t". Look for a line that

* says "typedef something-or-other size_t;". Then, change the line below

* that says "#include <someincludefile.h>" to instead include the file

* you found size_t in, and define NEED_SPECIAL_INCLUDE. If you can't find

* type size_t anywhere, try replacing "#include <someincludefile.h>" with

* "typedef unsigned int size_t;".

*/

#undef NEED_SPECIAL_INCLUDE /* assume we DON'T need it, for starters */

#ifdef NEED_SPECIAL_INCLUDE

#include <someincludefile.h>

#endif

typedef size_t my_size_t; /* The payoff: do we have size_t now? */

/* The next question is whether your compiler supports ANSI-style function

* prototypes. You need to know this in order to choose between using

* makefile.ansi and using makefile.unix.

* The #define line below is set to assume you have ANSI function prototypes.

* If you get an error in this group of lines, undefine HAVE_PROTOTYPES.

*/

#define HAVE_PROTOTYPES

#ifdef HAVE_PROTOTYPES

int testfunction (int arg1, int * arg2); /* check prototypes */

struct methods_struct { /* check method-pointer declarations */

};

int testfunction (int arg1, int * arg2) /* check definitions */

{

return arg2[arg1];

}

int test2function (void) /* check void arg list */

{

return 0;

}

#endif

/* Now we want to find out if your compiler knows what "unsigned char" means.

* If you get an error on the "unsigned char un_char;" line,

* then undefine HAVE_UNSIGNED_CHAR.

*/

#define HAVE_UNSIGNED_CHAR

#ifdef HAVE_UNSIGNED_CHAR

unsigned char un_char;

#endif

/* Now we want to find out if your compiler knows what "unsigned short" means.

* If you get an error on the "unsigned short un_short;" line,

* then undefine HAVE_UNSIGNED_SHORT.

*/

#define HAVE_UNSIGNED_SHORT

#ifdef HAVE_UNSIGNED_SHORT

unsigned short un_short;

#endif

/* Now we want to find out if your compiler understands type "void".

* If you get an error anywhere in here, undefine HAVE_VOID.

*/

#define HAVE_VOID

#ifdef HAVE_VOID

/* Caution: a C++ compiler will insist on complete prototypes */

typedef void * void_ptr; /* check void * */

#ifdef HAVE_PROTOTYPES /* check ptr to function returning void */

typedef void (*void_func) (int a, int b);

#else

typedef void (*void_func) ();

#endif

#ifdef HAVE_PROTOTYPES /* check void function result */

void test3function (void_ptr arg1, void_func arg2)

#else

void test3function (arg1, arg2)

void_ptr arg1;

void_func arg2;

#endif

{

char * locptr = (char *) arg1; /* check casting to and from void * */

arg1 = (void *) locptr;

(*arg2) (1, 2); /* check call of fcn returning void */

}

#endif

/* Now we want to find out if your compiler knows what "const" means.

* If you get an error here, undefine HAVE_CONST.

*/

#define HAVE_CONST

#ifdef HAVE_CONST

static const int carray[3] = {1, 2, 3};

#ifdef HAVE_PROTOTYPES

int test4function (const int arg1)

#else

int test4function (arg1)

const int arg1;

#endif

{

return carray[arg1];

}

#endif

/* If you get an error or warning about this structure definition,

* define INCOMPLETE_TYPES_BROKEN.

*/

#undef INCOMPLETE_TYPES_BROKEN

#ifndef INCOMPLETE_TYPES_BROKEN

typedef struct undefined_structure * undef_struct_ptr;

#endif

/* If you get an error about duplicate names,

* define NEED_SHORT_EXTERNAL_NAMES.

*/

#undef NEED_SHORT_EXTERNAL_NAMES

#ifndef NEED_SHORT_EXTERNAL_NAMES

int possibly_duplicate_function ()

{

return 0;

}

int possibly_dupli_function ()

{

return 1;

}

#endif

/************************************************************************

* OK, that's it. You should not have to change anything beyond this

* point in order to compile and execute this program. (You might get

* some warnings, but you can ignore them.)

* When you run the program, it will make a couple more tests that it

* can do automatically, and then it will create jconfig.h and print out

* any additional suggestions it has.

************************************************************************

*/

#ifdef HAVE_PROTOTYPES

int is_char_signed (int arg)

#else

int is_char_signed (arg)

int arg;

#endif

{

if (arg == 189) { /* expected result for unsigned char */

return 0; /* type char is unsigned */

}

else if (arg != -67) { /* expected result for signed char */

printf("Hmm, it seems 'char' is not eight bits wide on your machine.\n");

printf("I fear the JPEG software will not work at all.\n\n");

}

return 1; /* assume char is signed otherwise */

}

#ifdef HAVE_PROTOTYPES

int is_shifting_signed (long arg)

#else

int is_shifting_signed (arg)

long arg;

#endif

/* See whether right-shift on a long is signed or not. */

{

long res = arg >> 4;

if (res == -0x7F7E80CL) { /* expected result for signed shift */

return 1; /* right shift is signed */

}

/* see if unsigned-shift hack will fix it. */

/* we can't just test exact value since it depends on width of long... */

res |= (~0L) << (32-4);

if (res == -0x7F7E80CL) { /* expected result now? */

return 0; /* right shift is unsigned */

}

printf("Right shift isn't acting as I expect it to.\n");

printf("I fear the JPEG software will not work at all.\n\n");

return 0; /* try it with unsigned anyway */

}

#ifdef HAVE_PROTOTYPES

int main (int argc, char ** argv)

#else

int main (argc, argv)

int argc;

char ** argv;

#endif

{

char signed_char_check = (char) (-67);

FILE *outfile;

/* Attempt to write jconfig.h */

if ((outfile = fopen("jconfig.h", "w")) == NULL) {

printf("Failed to write jconfig.h\n");

return 1;

}

/* Write out all the info */

fprintf(outfile, "/* jconfig.h --- generated by ckconfig.c */\n");

fprintf(outfile, "/* see jconfig.txt for explanations */\n\n");

#ifdef HAVE_PROTOTYPES

fprintf(outfile, "#define HAVE_PROTOTYPES\n");

#else

fprintf(outfile, "#undef HAVE_PROTOTYPES\n");

#endif

#ifdef HAVE_UNSIGNED_CHAR

fprintf(outfile, "#define HAVE_UNSIGNED_CHAR\n");

#else

fprintf(outfile, "#undef HAVE_UNSIGNED_CHAR\n");

#endif

#ifdef HAVE_UNSIGNED_SHORT

fprintf(outfile, "#define HAVE_UNSIGNED_SHORT\n");

#else

fprintf(outfile, "#undef HAVE_UNSIGNED_SHORT\n");

#endif

#ifdef HAVE_VOID

fprintf(outfile, "/* #define void char */\n");

#else

fprintf(outfile, "#define void char\n");

#endif

#ifdef HAVE_CONST

fprintf(outfile, "/* #define const */\n");

#else

fprintf(outfile, "#define const\n");

#endif

if (is_char_signed((int) signed_char_check))

fprintf(outfile, "#undef CHAR_IS_UNSIGNED\n");

else

fprintf(outfile, "#define CHAR_IS_UNSIGNED\n");

#ifdef HAVE_STDDEF_H

fprintf(outfile, "#define HAVE_STDDEF_H\n");

#else

fprintf(outfile, "#undef HAVE_STDDEF_H\n");

#endif

#ifdef HAVE_STDLIB_H

fprintf(outfile, "#define HAVE_STDLIB_H\n");

#else

fprintf(outfile, "#undef HAVE_STDLIB_H\n");

#endif

#ifdef NEED_BSD_STRINGS

fprintf(outfile, "#define NEED_BSD_STRINGS\n");

#else

fprintf(outfile, "#undef NEED_BSD_STRINGS\n");

#endif

#ifdef NEED_SYS_TYPES_H

fprintf(outfile, "#define NEED_SYS_TYPES_H\n");

#else

fprintf(outfile, "#undef NEED_SYS_TYPES_H\n");

#endif

fprintf(outfile, "#undef NEED_FAR_POINTERS\n");

#ifdef NEED_SHORT_EXTERNAL_NAMES

fprintf(outfile, "#define NEED_SHORT_EXTERNAL_NAMES\n");

#else

fprintf(outfile, "#undef NEED_SHORT_EXTERNAL_NAMES\n");

#endif

#ifdef INCOMPLETE_TYPES_BROKEN

fprintf(outfile, "#define INCOMPLETE_TYPES_BROKEN\n");

#else

fprintf(outfile, "#undef INCOMPLETE_TYPES_BROKEN\n");

#endif

fprintf(outfile, "\n#ifdef JPEG_INTERNALS\n\n");

if (is_shifting_signed(-0x7F7E80B1L))

fprintf(outfile, "#undef RIGHT_SHIFT_IS_UNSIGNED\n");

else

fprintf(outfile, "#define RIGHT_SHIFT_IS_UNSIGNED\n");

fprintf(outfile, "\n#endif /* JPEG_INTERNALS */\n");

fprintf(outfile, "\n#ifdef JPEG_CJPEG_DJPEG\n\n");

fprintf(outfile, "#define BMP_SUPPORTED /* BMP image file format */\n");

fprintf(outfile, "#define GIF_SUPPORTED /* GIF image file format */\n");

fprintf(outfile, "#define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */\n");

fprintf(outfile, "#undef RLE_SUPPORTED /* Utah RLE image file format */\n");

fprintf(outfile, "#define TARGA_SUPPORTED /* Targa image file format */\n\n");

fprintf(outfile, "#undef TWO_FILE_COMMANDLINE /* You may need this on non-Unix systems */\n");

fprintf(outfile, "#undef NEED_SIGNAL_CATCHER /* Define this if you use jmemname.c */\n");

fprintf(outfile, "#undef DONT_USE_B_MODE\n");

fprintf(outfile, "/* #define PROGRESS_REPORT */ /* optional */\n");

fprintf(outfile, "\n#endif /* JPEG_CJPEG_DJPEG */\n");

/* Close the jconfig.h file */

fclose(outfile);

/* User report */

printf("Configuration check for Independent JPEG Group's software done.\n");

printf("\nI have written the jconfig.h file for you.\n\n");

#ifdef HAVE_PROTOTYPES

printf("You should use makefile.ansi as the starting point for your Makefile.\n");

#else

printf("You should use makefile.unix as the starting point for your Makefile.\n");

#endif

#ifdef NEED_SPECIAL_INCLUDE

printf("\nYou'll need to change jconfig.h to include the system include file\n");

printf("that you found type size_t in, or add a direct definition of type\n");

printf("size_t if that's what you used. Just add it to the end.\n");

#endif

return 0;

}