1 /* $NetBSD: enum.c,v 1.15 2021/02/02 17:56:31 rillig Exp $ */
2
3 /*
4 Copyright (c) 2020 Roland Illig <rillig@NetBSD.org>
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
9 are met:
10
11 1. Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
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 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
21 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "make.h"
31
32 MAKE_RCSID("$NetBSD: enum.c,v 1.15 2021/02/02 17:56:31 rillig Exp $");
33
34 /*
35 * Convert a bitset into a string representation, showing the names of the
36 * individual bits.
37 *
38 * Optionally, shortcuts for groups of bits can be added. To have an effect,
39 * they need to be listed before their individual bits.
40 */
41 const char *
Enum_FlagsToString(char * buf,size_t buf_size,int value,const EnumToStringSpec * spec)42 Enum_FlagsToString(char *buf, size_t buf_size,
43 int value, const EnumToStringSpec *spec)
44 {
45 const char *buf_start = buf;
46 const char *sep = "";
47 size_t sep_len = 0;
48
49 for (; spec->es_value != 0; spec++) {
50 size_t name_len;
51
52 if ((value & spec->es_value) != spec->es_value)
53 continue;
54 value &= ~spec->es_value;
55
56 assert(buf_size >= sep_len + 1);
57 memcpy(buf, sep, sep_len);
58 buf += sep_len;
59 buf_size -= sep_len;
60
61 name_len = strlen(spec->es_name);
62 assert(buf_size >= name_len + 1);
63 memcpy(buf, spec->es_name, name_len);
64 buf += name_len;
65 buf_size -= name_len;
66
67 sep = ENUM__SEP;
68 sep_len = sizeof ENUM__SEP - 1;
69 }
70
71 /* If this assertion fails, the listed enum values are incomplete. */
72 assert(value == 0);
73
74 if (buf == buf_start)
75 return "none";
76
77 assert(buf_size >= 1);
78 buf[0] = '\0';
79 return buf_start;
80 }
81