/* | |
* 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 (*error_exit) (char *msgtext); | |
int (*trace_message) (char *msgtext); | |
int (*another_method) (void); | |
}; | |
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; | |
} |