851c5fa92a
The functions LstIsValid and LstNodeIsValid are only used in assertions. Without the always-false assertion, Enum_ValueToString could have returned undefined behavior.
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/* $NetBSD: enum.c,v 1.5 2020/08/28 19:46:04 rillig Exp $ */
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/*
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Copyright (c) 2020 Roland Illig <rillig@NetBSD.org>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MAKE_NATIVE
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static char rcsid[] = "$NetBSD: enum.c,v 1.5 2020/08/28 19:46:04 rillig Exp $";
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#else
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: enum.c,v 1.5 2020/08/28 19:46:04 rillig Exp $");
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#endif
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "enum.h"
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/* Convert a bitset into a string representation showing the names of the
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* individual bits, or optionally shortcuts for groups of bits. */
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const char *
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Enum_FlagsToString(char *buf, size_t buf_size,
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int value, const EnumToStringSpec *spec)
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{
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const char *buf_start = buf;
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const char *sep = "";
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size_t sep_len = 0;
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for (; spec->es_value != 0; spec++) {
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size_t name_len;
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if ((value & spec->es_value) != spec->es_value)
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continue;
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value &= ~spec->es_value;
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assert(buf_size >= sep_len + 1);
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memcpy(buf, sep, sep_len);
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buf += sep_len;
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buf_size -= sep_len;
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name_len = strlen(spec->es_name);
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assert(buf_size >= name_len + 1);
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memcpy(buf, spec->es_name, name_len);
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buf += name_len;
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buf_size -= name_len;
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sep = ENUM__SEP;
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sep_len = sizeof ENUM__SEP - 1;
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}
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assert(value == 0);
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if (buf == buf_start)
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return "none";
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assert(buf_size >= 1);
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buf[0] = '\0';
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return buf_start;
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}
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/* Convert a fixed-value enum into a string representation. */
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const char *
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Enum_ValueToString(int value, const EnumToStringSpec *spec)
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{
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for (; spec->es_name[0] != '\0'; spec++) {
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if (value == spec->es_value)
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return spec->es_name;
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}
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abort(/* unknown enum value */);
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}
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