bits.c revision 55682 
1/*
2 * Copyright (c) 1997 - 1999 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: bits.c,v 1.16 1999/12/02 17:04:57 joda Exp $");
37#endif
38#include <stdio.h>
39#include <string.h>
40#include <stdlib.h>
41#include <ctype.h>
42
43static void
44my_strupr(char *s)
45{
46    char *p = s;
47
48    while(*p){
49	if(islower((unsigned char)*p))
50	    *p = toupper((unsigned char)*p);
51	p++;
52    }
53}
54
55
56#define BITSIZE(TYPE)						\
57{								\
58    int b = 0; TYPE x = 1, zero = 0; char *pre = "u_";		\
59    char tmp[128], tmp2[128];					\
60    while(x){ x <<= 1; b++; if(x < zero) pre=""; }		\
61    if(b >= len){						\
62        int tabs;						\
63	sprintf(tmp, "%sint%d_t" , pre, len);			\
64	sprintf(tmp2, "typedef %s %s;", #TYPE, tmp);		\
65	my_strupr(tmp);						\
66	tabs = 5 - strlen(tmp2) / 8;				\
67        fprintf(f, "%s", tmp2);					\
68	while(tabs-- > 0) fprintf(f, "\t");			\
69	fprintf(f, "/* %2d bits */\n", b);			\
70        return;                                                 \
71    }								\
72}
73
74static void
75try_signed(FILE *f, int len)
76{
77    BITSIZE(signed char);
78    BITSIZE(short);
79    BITSIZE(int);
80    BITSIZE(long);
81#ifdef HAVE_LONG_LONG
82    BITSIZE(long long);
83#endif
84    fprintf(f, "/* There is no %d bit type */\n", len);
85}
86
87static void
88try_unsigned(FILE *f, int len)
89{
90    BITSIZE(unsigned char);
91    BITSIZE(unsigned short);
92    BITSIZE(unsigned int);
93    BITSIZE(unsigned long);
94#ifdef HAVE_LONG_LONG
95    BITSIZE(unsigned long long);
96#endif
97    fprintf(f, "/* There is no %d bit type */\n", len);
98}
99
100static int
101print_bt(FILE *f, int flag)
102{
103    if(flag == 0){
104	fprintf(f, "/* For compatibility with various type definitions */\n");
105	fprintf(f, "#ifndef __BIT_TYPES_DEFINED__\n");
106	fprintf(f, "#define __BIT_TYPES_DEFINED__\n");
107	fprintf(f, "\n");
108    }
109    return 1;
110}
111
112int main(int argc, char **argv)
113{
114    FILE *f;
115    int flag;
116    char *fn, *hb;
117
118    if(argc < 2){
119	fn = "bits.h";
120	hb = "__BITS_H__";
121	f = stdout;
122    } else {
123	char *p;
124	fn = argv[1];
125	hb = malloc(strlen(fn) + 5);
126	sprintf(hb, "__%s__", fn);
127	for(p = hb; *p; p++){
128	    if(!isalnum((unsigned char)*p))
129		*p = '_';
130	}
131	f = fopen(argv[1], "w");
132    }
133    fprintf(f, "/* %s -- this file was generated for %s by\n", fn, HOST);
134    fprintf(f, "   %*s    %s */\n\n", (int)strlen(fn), "",
135	    "$Id: bits.c,v 1.16 1999/12/02 17:04:57 joda Exp $");
136    fprintf(f, "#ifndef %s\n", hb);
137    fprintf(f, "#define %s\n", hb);
138    fprintf(f, "\n");
139#ifdef HAVE_SYS_TYPES_H
140    fprintf(f, "#include <sys/types.h>\n");
141#endif
142#ifdef HAVE_INTTYPES_H
143    fprintf(f, "#include <inttypes.h>\n");
144#endif
145#ifdef HAVE_SYS_BITYPES_H
146    fprintf(f, "#include <sys/bitypes.h>\n");
147#endif
148#ifdef HAVE_BIND_BITYPES_H
149    fprintf(f, "#include <bind/bitypes.h>\n");
150#endif
151#ifdef HAVE_NETINET_IN6_MACHTYPES_H
152    fprintf(f, "#include <netinet/in6_machtypes.h>\n");
153#endif
154    fprintf(f, "\n");
155
156    flag = 0;
157#ifndef HAVE_INT8_T
158    flag = print_bt(f, flag);
159    try_signed (f, 8);
160#endif /* HAVE_INT8_T */
161#ifndef HAVE_INT16_T
162    flag = print_bt(f, flag);
163    try_signed (f, 16);
164#endif /* HAVE_INT16_T */
165#ifndef HAVE_INT32_T
166    flag = print_bt(f, flag);
167    try_signed (f, 32);
168#endif /* HAVE_INT32_T */
169#if 0
170#ifndef HAVE_INT64_T
171    flag = print_bt(f, flag);
172    try_signed (f, 64);
173#endif /* HAVE_INT64_T */
174#endif
175
176#ifndef HAVE_U_INT8_T
177    flag = print_bt(f, flag);
178    try_unsigned (f, 8);
179#endif /* HAVE_INT8_T */
180#ifndef HAVE_U_INT16_T
181    flag = print_bt(f, flag);
182    try_unsigned (f, 16);
183#endif /* HAVE_U_INT16_T */
184#ifndef HAVE_U_INT32_T
185    flag = print_bt(f, flag);
186    try_unsigned (f, 32);
187#endif /* HAVE_U_INT32_T */
188#if 0
189#ifndef HAVE_U_INT64_T
190    flag = print_bt(f, flag);
191    try_unsigned (f, 64);
192#endif /* HAVE_U_INT64_T */
193#endif
194
195    if(flag){
196	fprintf(f, "\n");
197	fprintf(f, "#endif /* __BIT_TYPES_DEFINED__ */\n\n");
198    }
199    fprintf(f, "#endif /* %s */\n", hb);
200    return 0;
201}
202