2 * Copyright (c) 2007 Diomidis Spinellis
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/types.h>
41 int readrec_forward(FILE *f, struct acctv2 *av2);
42 int readrec_backward(FILE *f, struct acctv2 *av2);
45 * Reverse offsetof: return the offset of field f
46 * from the end of the structure s.
48 #define roffsetof(s, f) (sizeof(s) - offsetof(s, f))
51 * Read exactly one record of size size from stream f into ptr.
52 * Failure to read the complete record is considered a file format error,
53 * and will set errno to EFTYPE.
54 * Return 0 on success, EOF on end of file or error.
57 fread_record(void *ptr, size_t size, FILE *f)
61 if ((rv = fread(ptr, 1, size, f)) == size)
63 else if (ferror(f) || rv == 0)
73 * Return the value of a comp_t field.
81 for (exp = v >> 13; exp; exp--)
83 return ((double)result / AHZV1);
87 * Read a v1 accounting record stored at the current
88 * position of stream f.
89 * Convert the data to the current record format.
90 * Return EOF on error or end-of-file.
93 readrec_v1(FILE *f, struct acctv2 *av2)
98 if ((rv = fread_record(&av1, sizeof(av1), f)) == EOF)
102 av2->ac_len = av2->ac_len2 = sizeof(*av2);
103 memcpy(av2->ac_comm, av1.ac_comm, AC_COMM_LEN);
104 av2->ac_utime = decode_comp(av1.ac_utime) * 1000000;
105 av2->ac_stime = decode_comp(av1.ac_stime) * 1000000;
106 av2->ac_etime = decode_comp(av1.ac_etime) * 1000000;
107 av2->ac_btime = av1.ac_btime;
108 av2->ac_uid = av1.ac_uid;
109 av2->ac_gid = av1.ac_gid;
110 av2->ac_mem = av1.ac_mem;
111 av2->ac_io = decode_comp(av1.ac_io);
112 av2->ac_tty = av1.ac_tty;
113 av2->ac_flagx = av1.ac_flag | ANVER;
118 * Read an v2 accounting record stored at the current
119 * position of stream f.
120 * Return EOF on error or end-of-file.
123 readrec_v2(FILE *f, struct acctv2 *av2)
125 return (fread_record(av2, sizeof(*av2), f));
129 * Read a new-style (post-v1) accounting record stored at
130 * the current position of stream f.
131 * Convert the data to the current record format.
132 * Return EOF on error or end-of-file.
135 readrec_vx(FILE *f, struct acctv2 *av2)
137 uint8_t magic, version;
139 if (fread_record(&magic, sizeof(magic), f) == EOF ||
140 fread_record(&version, sizeof(version), f) == EOF ||
141 ungetc(version, f) == EOF ||
142 ungetc(magic, f) == EOF)
146 return (readrec_v2(f, av2));
148 /* Add handling for more versions here. */
157 * Read an accounting record stored at the current
158 * position of stream f.
159 * Old-format records are converted to the current record
161 * Return the number of records read (1 or 0 at the end-of-file),
165 readrec_forward(FILE *f, struct acctv2 *av2)
169 if ((magic = getc(f)) == EOF)
170 return (ferror(f) ? EOF : 0);
171 if (ungetc(magic, f) == EOF)
174 /* Old record format. */
175 rv = readrec_v1(f, av2);
177 /* New record formats. */
178 rv = readrec_vx(f, av2);
179 return (rv == EOF ? EOF : 1);
183 * Read an accounting record ending at the current
184 * position of stream f.
185 * Old-format records are converted to the current record
187 * The file pointer is positioned at the beginning of the
189 * Return the number of records read (1 or 0 at the end-of-file),
193 readrec_backward(FILE *f, struct acctv2 *av2)
199 if ((pos = ftell(f)) == -1)
203 if (fseek(f, -roffsetof(struct acctv2, ac_trailer),
205 (c = getc(f)) == EOF)
208 /* New record formats. */
209 if (fseeko(f, pos - roffsetof(struct acctv2, ac_len2),
211 fread_record(&len, sizeof(len), f) == EOF ||
212 fseeko(f, pos - len, SEEK_SET) == EOF ||
213 readrec_vx(f, av2) == EOF ||
214 fseeko(f, pos - len, SEEK_SET) == EOF)
219 /* Old record format. */
220 if (fseeko(f, pos - sizeof(struct acctv1), SEEK_SET) == EOF ||
221 readrec_v1(f, av2) == EOF ||
222 fseeko(f, pos - sizeof(struct acctv1), SEEK_SET) == EOF)