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- /* Copyright (C) 1989, 1992, 1993 Aladdin Enterprises. All rights reserved.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* genarch.c */
- /* Generate a header file (arch.h) with parameters */
- /* reflecting the machine architecture and compiler characteristics. */
-
- #include <stdio.h>
-
- /* We should write the result on stdout, but the original Turbo C 'make' */
- /* can't handle output redirection (sigh). */
-
- main(argc, argv)
- int argc;
- char *argv[];
- { char *fname = argv[1];
- long one = 1;
- #define ffs_strlen 16
- char *ffs = "ffffffffffffffff";
- struct { char c; short s; } ss;
- struct { char c; int i; } si;
- struct { char c; long l; } sl;
- struct { char c; char *p; } sp;
- struct { char c; float f; } sf;
- struct { char c; double d; } sd;
- long lm1 = -1;
- long lr1 = lm1 >> 1, lr2 = lm1 >> 2;
- unsigned long um1 = ~(unsigned long)0;
- int im1 = -1;
- int ir1 = im1 >> 1, ir2 = im1 >> 2;
- union { long l; char *p; } pl0, pl1;
- int ars;
- int lwidth = sizeof(long) * 8;
- union { float f; int i; long l; } f0, f1, fm1;
- FILE *f = fopen(fname, "w");
- if ( f == NULL )
- { fprintf(stderr, "genarch.c: can't open %s for writing\n", fname);
- exit(1);
- }
- fprintf(f, "/* Parameters derived from machine and compiler architecture */\n");
-
- fprintf(f, "\n\t/* Scalar alignments */\n");
- #define offset(s, e) (int)((char *)&s.e - (char *)&s)
- fprintf(f, "#define arch_align_short_mod %d\n", offset(ss, s));
- fprintf(f, "#define arch_align_int_mod %d\n", offset(si, i));
- fprintf(f, "#define arch_align_long_mod %d\n", offset(sl, l));
- fprintf(f, "#define arch_align_ptr_mod %d\n", offset(sp, p));
- fprintf(f, "#define arch_align_float_mod %d\n", offset(sf, f));
- fprintf(f, "#define arch_align_double_mod %d\n", offset(sd, d));
- #undef offset
-
- fprintf(f, "\n\t/* Scalar sizes */\n");
- fprintf(f, "#define arch_sizeof_short %d\n", sizeof(short));
- fprintf(f, "#define arch_sizeof_int %d\n", sizeof(int));
- fprintf(f, "#define arch_sizeof_long %d\n", sizeof(long));
- fprintf(f, "#define arch_sizeof_ptr %d\n", sizeof(char *));
- fprintf(f, "#define arch_sizeof_float %d\n", sizeof(float));
- fprintf(f, "#define arch_sizeof_double %d\n", sizeof(double));
-
- fprintf(f, "\n\t/* Unsigned max values */\n");
- #define pmax(str, typ, tstr, l)\
- fprintf(f, "#define arch_max_%s ((%s)0x%s%s + (%s)0)\n",\
- str, tstr, ffs + ffs_strlen - sizeof(typ) * 2, l, tstr)
- pmax("uchar", unsigned char, "unsigned char", "");
- pmax("ushort", unsigned short, "unsigned short", "");
- pmax("uint", unsigned int, "unsigned int", "");
- pmax("ulong", unsigned long, "unsigned long", "L");
- #undef pmax
-
- fprintf(f, "\n\t/* Miscellaneous */\n");
- fprintf(f, "#define arch_is_big_endian %d\n", 1 - *(char *)&one);
- pl0.l = 0;
- pl1.l = -1;
- fprintf(f, "#define arch_ptrs_are_signed %d\n",
- (pl1.p < pl0.p));
- f0.f = 0.0, f1.f = 1.0, fm1.f = -1.0;
- /* We have to test the size dynamically here, */
- /* because the preprocessor can't evaluate sizeof. */
- fprintf(f, "#define arch_floats_are_IEEE %d\n",
- ((sizeof(float) == sizeof(int) ?
- f0.i == 0 && f1.i == (int)0x3f800000 && fm1.i == (int)0xbf800000 :
- f0.l == 0 && f1.l == 0x3f800000L && fm1.l == 0xbf800000L)
- ? 1 : 0));
- /* There are three cases for arithmetic right shift: */
- /* always correct, correct except for right-shifting a long by 1 */
- /* (a bug in some versions of the Turbo C compiler), and */
- /* never correct. */
- ars = (lr2 != -1 || ir1 != -1 || ir2 != -1 ? 0 :
- lr1 != -1 ? 1 : /* Turbo C problem */
- 2);
- fprintf(f, "#define arch_arith_rshift %d\n", ars);
- /* Some machines can't handle a variable shift by */
- /* the full width of a long. */
- fprintf(f, "#define arch_can_shift_full_long %d\n",
- um1 >> lwidth == 0);
- fclose(f);
- return 0;
- }
-