1/*
2 * Copyright (c) 2006 "David Kirchner" <dpk@dpk.net>. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/types.h>
27#include <stdbool.h>
28#include <stdio.h>
29#include <stdlib.h>
30
31#include "support.h"
32
33const char *
34lookup_value(struct name_table *table, uintmax_t val)
35{
36
37	for (; table->str != NULL; table++)
38		if (table->val == val)
39			return (table->str);
40	return (NULL);
41}
42
43/*
44 * Used when the value maps to a bitmask of #definition values in the
45 * table.  This is a helper routine which outputs a symbolic mask of
46 * matched masks.  Multiple masks are separated by a pipe ('|').
47 * The value is modified on return to only hold unmatched bits.
48 */
49void
50print_mask_part(FILE *fp, struct name_table *table, uintmax_t *valp,
51    bool *printed)
52{
53	uintmax_t rem;
54
55	rem = *valp;
56	for (; table->str != NULL; table++) {
57		if ((table->val & rem) == table->val) {
58			/*
59			 * Only print a zero mask if the raw value is
60			 * zero.
61			 */
62			if (table->val == 0 && *valp != 0)
63				continue;
64			fprintf(fp, "%s%s", *printed ? "|" : "", table->str);
65			*printed = true;
66			rem &= ~table->val;
67		}
68	}
69
70	*valp = rem;
71}
72
73/*
74 * Used when the value maps to a bitmask of #definition values in the
75 * table.  The return value is true if something was printed.  If
76 * rem is not NULL, *rem holds any bits not decoded if something was
77 * printed.  If nothing was printed and rem is not NULL, *rem holds
78 * the original value.
79 */
80bool
81print_mask_int(FILE *fp, struct name_table *table, int ival, int *rem)
82{
83	uintmax_t val;
84	bool printed;
85
86	printed = false;
87	val = (unsigned)ival;
88	print_mask_part(fp, table, &val, &printed);
89	if (rem != NULL)
90		*rem = val;
91	return (printed);
92}
93
94/*
95 * Used for a mask of optional flags where a value of 0 is valid.
96 */
97bool
98print_mask_0(FILE *fp, struct name_table *table, int val, int *rem)
99{
100
101	if (val == 0) {
102		fputs("0", fp);
103		if (rem != NULL)
104			*rem = 0;
105		return (true);
106	}
107	return (print_mask_int(fp, table, val, rem));
108}
109
110/*
111 * Like print_mask_0 but for a unsigned long instead of an int.
112 */
113bool
114print_mask_0ul(FILE *fp, struct name_table *table, u_long lval, u_long *rem)
115{
116	uintmax_t val;
117	bool printed;
118
119	if (lval == 0) {
120		fputs("0", fp);
121		if (rem != NULL)
122			*rem = 0;
123		return (true);
124	}
125
126	printed = false;
127	val = lval;
128	print_mask_part(fp, table, &val, &printed);
129	if (rem != NULL)
130		*rem = val;
131	return (printed);
132}
133
134void
135print_integer(FILE *fp, int val, int base)
136{
137
138	switch (base) {
139	case 8:
140		fprintf(fp, "0%o", val);
141		break;
142	case 10:
143		fprintf(fp, "%d", val);
144		break;
145	case 16:
146		fprintf(fp, "0x%x", val);
147		break;
148	default:
149		abort2("bad base", 0, NULL);
150		break;
151	}
152}
153
154bool
155print_value(FILE *fp, struct name_table *table, uintmax_t val)
156{
157	const char *str;
158
159	str = lookup_value(table, val);
160	if (str != NULL) {
161		fputs(str, fp);
162		return (true);
163	}
164	return (false);
165}
166