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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mptypes.c,v 1.3 1999/12/10 23:29:48 mdw Exp $ |
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4 | * |
5 | * Generate `mptypes.h' header file for current architecture |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
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28 | */ |
29 | |
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30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: mptypes.c,v $ |
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33 | * Revision 1.3 1999/12/10 23:29:48 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.2 1999/11/13 01:54:32 mdw |
37 | * Format source code properly ;-). Attach suffixes to the `max' |
38 | * constants. |
39 | * |
40 | */ |
41 | |
42 | /*----- Header files ------------------------------------------------------*/ |
43 | |
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44 | #define _GNU_SOURCE |
45 | #include <stdio.h> |
46 | #include <limits.h> |
47 | #if __STDC_VERSION__ >= 199900l |
48 | # include <stdint.h> |
49 | #endif |
50 | |
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51 | /*----- Data types --------------------------------------------------------*/ |
52 | |
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53 | /* --- Hack for GCC --- * |
54 | * |
55 | * WG14 in their infinite wisdom decided not to use the GCC constant name. |
56 | */ |
57 | |
58 | #if defined(ULONG_LONG_MAX) && !defined(ULLONG_MAX) |
59 | # define ULLONG_MAX ULONG_LONG_MAX |
60 | #endif |
61 | |
62 | /* --- Choose the largest integer type --- */ |
63 | |
64 | #if defined(UINTMAX_MAX) |
65 | typedef uintmax_t umax; |
66 | # define P_UMAX PRIuMAX |
67 | #elif defined(ULLONG_MAX) |
68 | typedef unsigned long long umax; |
69 | # define P_UMAX "%llu" |
70 | #else |
71 | typedef unsigned long umax; |
72 | # define P_UMAX "%lu" |
73 | #endif |
74 | |
75 | /* --- Table of interesting types --- * |
76 | * |
77 | * These are in preference order. |
78 | */ |
79 | |
80 | enum { |
81 | f_stdint |
82 | }; |
83 | |
84 | struct itype { |
85 | const char *name; |
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86 | const char *suff; |
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87 | umax max; |
88 | unsigned flags; |
89 | unsigned bits; |
90 | } tytab[] = { |
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91 | { "unsigned int", "u", UINT_MAX, 0 }, |
92 | { "unsigned short", "u", USHRT_MAX, 0 }, |
93 | { "unsigned long", "ul", ULONG_MAX, 0 }, |
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94 | #ifdef ULLONG_MAX |
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95 | { "unsigned long long", "ull", ULLONG_MAX, 0 }, |
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96 | #endif |
97 | #ifdef UINTMAX_MAX |
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98 | { "uintmax_t", "u", UINTMAX_MAX, f_stdint }, |
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99 | #endif |
100 | { 0, 0 }, |
101 | }; |
102 | |
103 | typedef struct itype itype; |
104 | |
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105 | /*----- Main code ---------------------------------------------------------*/ |
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106 | |
107 | int main(int argc, char *argv[]) |
108 | { |
109 | itype *i; |
110 | itype *largest, *mpw, *mpd; |
111 | |
112 | /* --- Find the bitcounts --- */ |
113 | |
114 | for (i = tytab; i->name; i++) { |
115 | unsigned bits; |
116 | umax u = i->max; |
117 | for (bits = 0; u; bits++) |
118 | u >>= 1; |
119 | i->bits = bits; |
120 | } |
121 | |
122 | /* --- Now try to find the interesting types --- * |
123 | * |
124 | * The first thing to do is to find the largest type. Then I find the |
125 | * `best' type which is less than half that size, and then the `best' type |
126 | * which is twice as big as that one. |
127 | */ |
128 | |
129 | largest = tytab; |
130 | for (i = tytab; i->name; i++) { |
131 | if (i->bits > largest->bits) |
132 | largest = i; |
133 | } |
134 | for (mpw = 0, i = tytab; i->name; i++) { |
135 | if (i->bits * 2 <= largest->bits && (!mpw || i->bits > mpw->bits)) |
136 | mpw = i; |
137 | } |
138 | if (!mpw) |
139 | mpw = tytab; |
140 | for (mpd = 0, i = tytab; i->name; i++) { |
141 | if (i->bits >= mpw->bits * 2 && (!mpd || i->bits < mpd->bits)) |
142 | mpd = i; |
143 | } |
144 | if (!mpd) { |
145 | static itype w, d; |
146 | d = w = *mpw; |
147 | w.bits /= 2; w.max = ~(~((umax)0) << w.bits); |
148 | d.bits = w.bits * 2; d.max = ~(~((umax)0) << d.bits); |
149 | mpw = &w; mpd = &d; |
150 | } |
151 | |
152 | /* --- Output time --- */ |
153 | |
154 | puts("\ |
155 | /* -*-c-*-\n\ |
156 | *\n\ |
157 | * mptypes.h [generated]\n\ |
158 | */\n\ |
159 | \n\ |
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160 | #ifndef CATACOMB_MPTYPES_H\n\ |
161 | #define CATACOMB_MPTYPES_H\n\ |
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162 | "); |
163 | if ((mpd->flags | mpw->flags) & f_stdint) { |
164 | puts("\ |
165 | #if __STDC_VERSION__ >= 199900l\n\ |
166 | # include <stdint.h>\n\ |
167 | #endif\n\ |
168 | "); |
169 | } |
170 | printf("\ |
171 | typedef %s mpw;\n\ |
172 | #define MPW_BITS %u\n\ |
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173 | #define MPW_MAX " P_UMAX "%s\n\ |
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174 | \n\ |
175 | typedef %s mpd;\n\ |
176 | #define MPD_BITS %u\n\ |
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177 | #define MPD_MAX " P_UMAX "%s\n\ |
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178 | \n\ |
179 | #endif\n\ |
180 | ", |
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181 | mpw->name, mpw->bits, mpw->max, mpw->suff, |
182 | mpd->name, mpd->bits, mpd->max, mpd->suff); |
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183 | |
184 | return (0); |
185 | } |
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186 | /*----- That's all, folks -------------------------------------------------*/ |