xref: /netbsd/common/lib/libutil/snprintb.c (revision 28469fc2)
1 /*	$NetBSD: snprintb.c,v 1.5 2009/05/13 02:50:31 pgoyette Exp $	*/
2 
3 /*-
4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
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  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  * POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 /*
30  * snprintb: print an interpreted bitmask to a buffer
31  *
32  * => returns the length of the buffer that would be required to print the
33  *    string minus the terminating NUL.
34  */
35 #ifndef _STANDALONE
36 # ifndef _KERNEL
37 
38 #  if HAVE_NBTOOL_CONFIG_H
39 #   include "nbtool_config.h"
40 #  endif
41 
42 #  include <sys/cdefs.h>
43 #  if defined(LIBC_SCCS) && !defined(lint)
44 __RCSID("$NetBSD: snprintb.c,v 1.5 2009/05/13 02:50:31 pgoyette Exp $");
45 #  endif
46 
47 #  include <sys/types.h>
48 #  include <sys/inttypes.h>
49 #  include <stdio.h>
50 #  include <util.h>
51 #  include <errno.h>
52 # else
53 #  include <sys/cdefs.h>
54 __KERNEL_RCSID(0, "$NetBSD: snprintb.c,v 1.5 2009/05/13 02:50:31 pgoyette Exp $");
55 #  include <sys/param.h>
56 #  include <sys/inttypes.h>
57 #  include <sys/systm.h>
58 #  include <lib/libkern/libkern.h>
59 # endif
60 
61 int
62 snprintb_m(char *buf, size_t buflen, const char *bitfmt, uint64_t val,
63 	   size_t l_max)
64 {
65 	char *bp = buf, *s_bp = NULL;
66 	const char *c_fmt, *s_fmt = NULL, *cur_fmt;
67 	const char *sbase;
68 	int bit, ch, t_len, s_len = 0, l_len, f_len, v_len, sep;
69 	int restart = 0;
70 	uint64_t field;
71 
72 #ifdef _KERNEL
73 	/*
74 	 * For safety; no other *s*printf() do this, but in the kernel
75 	 * we don't usually check the return value
76 	 */
77 	(void)memset(buf, 0, buflen);
78 #endif /* _KERNEL */
79 
80 	ch = *bitfmt++;
81 	switch (ch != '\177' ? ch : *bitfmt++) {
82 	case 8:
83 		sbase = "0%" PRIo64;
84 		break;
85 	case 10:
86 		sbase = "%" PRId64;
87 		break;
88 	case 16:
89 		sbase = "0x%" PRIx64;
90 		break;
91 	default:
92 		goto internal;
93 	}
94 
95 	/* Reserve space for trailing blank line if needed */
96 	if (l_max > 0)
97 		buflen--;
98 
99 	t_len = snprintf(bp, buflen, sbase, val);
100 	if (t_len < 0)
101 		goto internal;
102 
103 	v_len = l_len = t_len;
104 
105 	if ((size_t)t_len < buflen)
106 		bp += t_len;
107 	else
108 		bp += buflen - 1;
109 
110 	/*
111 	 * If the value we printed was 0 and we're using the old-style format,
112 	 * we're done.
113 	 */
114 	if ((val == 0) && (ch != '\177'))
115 		goto terminate;
116 
117 #define STORE(c) { l_len++;						\
118 		   if ((size_t)(++t_len) < buflen)			\
119 		   	*bp++ = (c);					\
120 		 } while ( /* CONSTCOND */ 0)
121 
122 #define	BACKUP	{ if (s_bp != NULL) {					\
123 			bp = s_bp; s_bp = NULL;				\
124 			t_len -= l_len - s_len;				\
125 			restart = 1;					\
126 			bitfmt = s_fmt;					\
127 		  }							\
128 		  STORE('>'); STORE('\0');				\
129 		  if ((size_t)t_len < buflen)				\
130 			snprintf(bp, buflen - t_len, sbase, val);	\
131 		  t_len += v_len; l_len = v_len; bp += v_len;		\
132 		} while ( /* CONSTCOND */ 0)
133 
134 #define	PUTSEP								\
135 		if (l_max > 0 && (size_t)l_len >= l_max) {		\
136 			BACKUP;						\
137 			STORE('<');					\
138 		} else {						\
139 			/* Remember separator location */		\
140 			if ( l_max > 0 && sep != '<') {			\
141 				s_len = l_len;				\
142 				s_bp  = bp;				\
143 				s_fmt = cur_fmt;			\
144 			}						\
145 			STORE(sep);					\
146 			restart = 0;					\
147 		}							\
148 
149 #define	PUTCHR(c)							\
150 		if (l_max > 0 && (size_t)l_len >= (l_max - 1)) {	\
151 			BACKUP;						\
152 			if (restart == 0) {				\
153 				STORE(c);				\
154 			} else						\
155 				sep = '<';				\
156 		} else {						\
157 			STORE(c);					\
158 			restart = 0;					\
159 		}							\
160 
161 #define PUTS(s) while ((ch = *(s)++) != 0) {				\
162 			PUTCHR(ch);					\
163 			if (restart)					\
164 				break;					\
165 		}
166 
167 	/*
168 	 * Chris Torek's new bitmask format is identified by a leading \177
169 	 */
170 	sep = '<';
171 	if (ch != '\177') {
172 		/* old (standard) format. */
173 		for (;(bit = *bitfmt) != 0;) {
174 			cur_fmt = bitfmt++;
175 			if (val & (1 << (bit - 1))) {
176 				PUTSEP;
177 				if (restart)
178 					continue;
179 				sep = ',';
180 				for (; (ch = *bitfmt) > ' '; ++bitfmt) {
181 					PUTCHR(ch);
182 					if (restart)
183 						break;
184 				}
185 			} else
186 				for (; *bitfmt > ' '; ++bitfmt)
187 					continue;
188 		}
189 	} else {
190 		/* new quad-capable format; also does fields. */
191 		field = val;
192 		while (c_fmt = bitfmt, (ch = *bitfmt++) != '\0') {
193 			bit = *bitfmt++;	/* now 0-origin */
194 			switch (ch) {
195 			case 'b':
196 				if (((u_int)(val >> bit) & 1) == 0)
197 					goto skip;
198 				cur_fmt = c_fmt;
199 				PUTSEP;
200 				if (restart)
201 					break;
202 				PUTS(bitfmt);
203 				if (restart == 0)
204 					sep = ',';
205 				break;
206 			case 'f':
207 			case 'F':
208 				cur_fmt = c_fmt;
209 				f_len = *bitfmt++;	/* field length */
210 				field = (val >> bit) &
211 					    (((uint64_t)1 << f_len) - 1);
212 				if (ch == 'F')	/* just extract */
213 					break;
214 				PUTSEP;
215 				if (restart == 0) {
216 					sep = ',';
217 					PUTS(bitfmt);
218 				}
219 				if (restart == 0) {
220 					PUTCHR('=');
221 				}
222 				if (restart == 0) {
223 					f_len = snprintf(bp, buflen - t_len,
224 							 sbase, field);
225 					if (f_len < 0)
226 						goto internal;
227 					t_len += f_len;
228 					l_len += f_len;
229 					if ((size_t)t_len < buflen)
230 						bp += f_len;
231 					if (l_max > 0 &&
232 					    (size_t)l_len > l_max) {
233 						PUTCHR('#');
234 					}
235 				}
236 				break;
237 			case '=':
238 			case ':':
239 				/*
240 				 * Here "bit" is actually a value instead,
241 				 * to be compared against the last field.
242 				 * This only works for values in [0..255],
243 				 * of course.
244 				 */
245 				if ((int)field != bit)
246 					goto skip;
247 				if (ch == '=') {
248 					PUTCHR('=');
249 				}
250 				PUTS(bitfmt);
251 				break;
252 			default:
253 			skip:
254 				while (*bitfmt++ != '\0')
255 					continue;
256 				break;
257 			}
258 		}
259 	}
260 	l_len++;
261 	if ((size_t)(++t_len) < buflen)
262 		*bp++ = '>';
263 terminate:
264 	*bp++ = '\0';
265 	if (l_max != 0) {
266 		t_len++;
267 		*bp = '\0';
268 	}
269 	return t_len;
270 internal:
271 #ifndef _KERNEL
272 	errno = EINVAL;
273 #endif
274 	return -1;
275 }
276 
277 int
278 snprintb(char *buf, size_t buflen, const char *bitfmt, uint64_t val)
279 {
280 	return snprintb_m(buf, buflen, bitfmt, val, 0);
281 }
282 #endif
283