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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mptypes.c,v 1.5 2004/04/08 01:36:15 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 | /*----- Header files ------------------------------------------------------*/ |
31 | |
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32 | #define _GNU_SOURCE |
33 | #include <stdio.h> |
34 | #include <limits.h> |
35 | #if __STDC_VERSION__ >= 199900l |
36 | # include <stdint.h> |
37 | #endif |
38 | |
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39 | /*----- Data types --------------------------------------------------------*/ |
40 | |
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41 | /* --- Hack for GCC --- * |
42 | * |
43 | * WG14 in their infinite wisdom decided not to use the GCC constant name. |
44 | */ |
45 | |
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46 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 91) |
47 | # define EXT __extension__ |
48 | #else |
49 | # define EXT |
50 | #endif |
51 | |
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52 | #if defined(ULONG_LONG_MAX) && !defined(ULLONG_MAX) |
53 | # define ULLONG_MAX ULONG_LONG_MAX |
54 | #endif |
55 | |
56 | /* --- Choose the largest integer type --- */ |
57 | |
58 | #if defined(UINTMAX_MAX) |
59 | typedef uintmax_t umax; |
60 | # define P_UMAX PRIuMAX |
61 | #elif defined(ULLONG_MAX) |
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62 | __extension__ typedef unsigned long long umax; |
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63 | # define P_UMAX "%llu" |
64 | #else |
65 | typedef unsigned long umax; |
66 | # define P_UMAX "%lu" |
67 | #endif |
68 | |
69 | /* --- Table of interesting types --- * |
70 | * |
71 | * These are in preference order. |
72 | */ |
73 | |
74 | enum { |
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75 | f_stdint = 1u, |
76 | f_ext = 2u |
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77 | }; |
78 | |
79 | struct itype { |
80 | const char *name; |
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81 | const char *suff; |
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82 | umax max; |
83 | unsigned flags; |
84 | unsigned bits; |
85 | } tytab[] = { |
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86 | { "unsigned int", "u", UINT_MAX, 0 }, |
87 | { "unsigned short", "u", USHRT_MAX, 0 }, |
88 | { "unsigned long", "ul", ULONG_MAX, 0 }, |
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89 | #ifdef ULLONG_MAX |
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90 | { "unsigned long long", "ull", EXT ULLONG_MAX, f_ext }, |
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91 | #endif |
92 | #ifdef UINTMAX_MAX |
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93 | { "uintmax_t", "u", UINTMAX_MAX, f_stdint }, |
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94 | #endif |
95 | { 0, 0 }, |
96 | }; |
97 | |
98 | typedef struct itype itype; |
99 | |
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100 | /*----- Main code ---------------------------------------------------------*/ |
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101 | |
102 | int main(int argc, char *argv[]) |
103 | { |
104 | itype *i; |
105 | itype *largest, *mpw, *mpd; |
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106 | const static char *extstr = "CATACOMB_MPTYPES_EXTENSION "; |
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107 | |
108 | /* --- Find the bitcounts --- */ |
109 | |
110 | for (i = tytab; i->name; i++) { |
111 | unsigned bits; |
112 | umax u = i->max; |
113 | for (bits = 0; u; bits++) |
114 | u >>= 1; |
115 | i->bits = bits; |
116 | } |
117 | |
118 | /* --- Now try to find the interesting types --- * |
119 | * |
120 | * The first thing to do is to find the largest type. Then I find the |
121 | * `best' type which is less than half that size, and then the `best' type |
122 | * which is twice as big as that one. |
123 | */ |
124 | |
125 | largest = tytab; |
126 | for (i = tytab; i->name; i++) { |
127 | if (i->bits > largest->bits) |
128 | largest = i; |
129 | } |
130 | for (mpw = 0, i = tytab; i->name; i++) { |
131 | if (i->bits * 2 <= largest->bits && (!mpw || i->bits > mpw->bits)) |
132 | mpw = i; |
133 | } |
134 | if (!mpw) |
135 | mpw = tytab; |
136 | for (mpd = 0, i = tytab; i->name; i++) { |
137 | if (i->bits >= mpw->bits * 2 && (!mpd || i->bits < mpd->bits)) |
138 | mpd = i; |
139 | } |
140 | if (!mpd) { |
141 | static itype w, d; |
142 | d = w = *mpw; |
143 | w.bits /= 2; w.max = ~(~((umax)0) << w.bits); |
144 | d.bits = w.bits * 2; d.max = ~(~((umax)0) << d.bits); |
145 | mpw = &w; mpd = &d; |
146 | } |
147 | |
148 | /* --- Output time --- */ |
149 | |
150 | puts("\ |
151 | /* -*-c-*-\n\ |
152 | *\n\ |
153 | * mptypes.h [generated]\n\ |
154 | */\n\ |
155 | \n\ |
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156 | #ifndef CATACOMB_MPTYPES_H\n\ |
157 | #define CATACOMB_MPTYPES_H\n\ |
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158 | "); |
159 | if ((mpd->flags | mpw->flags) & f_stdint) { |
160 | puts("\ |
161 | #if __STDC_VERSION__ >= 199900l\n\ |
162 | # include <stdint.h>\n\ |
163 | #endif\n\ |
164 | "); |
165 | } |
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166 | if ((mpd->flags | mpw->flags) & f_ext) { |
167 | printf("\ |
168 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 91)\n\ |
169 | # define %s __extension__\n\ |
170 | #else\n\ |
171 | # define %s\n\ |
172 | #endif\n\ |
173 | ", extstr, extstr); |
174 | } |
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175 | printf("\ |
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176 | %stypedef %s mpw;\n\ |
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177 | #define MPW_BITS %u\n\ |
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178 | #define MPW_MAX %s" P_UMAX "%s\n\ |
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179 | \n\ |
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180 | %stypedef %s mpd;\n\ |
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181 | #define MPD_BITS %u\n\ |
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182 | #define MPD_MAX %s" P_UMAX "%s\n\ |
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183 | \n\ |
184 | #endif\n\ |
185 | ", |
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186 | mpw->flags & f_ext ? extstr : "", mpw->name, |
187 | mpw->bits, |
188 | mpw->flags & f_ext ? extstr : "", mpw->max, mpw->suff, |
189 | mpd->flags & f_ext ? extstr : "", mpd->name, |
190 | mpd->bits, |
191 | mpd->flags & f_ext ? extstr : "", mpd->max, mpd->suff); |
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192 | |
193 | return (0); |
194 | } |
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195 | |
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196 | /*----- That's all, folks -------------------------------------------------*/ |