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f3ed775e DG |
1 | /* |
2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
f3ed775e DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
4c462e79 | 18 | #define _GNU_SOURCE |
f3ed775e | 19 | #include <stdlib.h> |
679b4943 | 20 | #include <ctype.h> |
3badf2bf | 21 | #include <limits.h> |
f3ed775e | 22 | |
db758600 | 23 | #include <common/error.h> |
f3ed775e | 24 | |
beb8c75a | 25 | #include "conf.h" |
679b4943 | 26 | #include "utils.h" |
f3ed775e | 27 | |
f3ed775e DG |
28 | /* |
29 | * get_session_name | |
30 | * | |
31 | * Return allocated string with the session name found in the config | |
32 | * directory. | |
33 | */ | |
34 | char *get_session_name(void) | |
35 | { | |
36 | char *path, *session_name = NULL; | |
37 | ||
38 | /* Get path to config file */ | |
58a97671 | 39 | path = config_get_default_path(); |
f3ed775e DG |
40 | if (path == NULL) { |
41 | goto error; | |
42 | } | |
43 | ||
44 | /* Get session name from config */ | |
45 | session_name = config_read_session_name(path); | |
46 | if (session_name == NULL) { | |
58a97671 | 47 | goto error; |
f3ed775e DG |
48 | } |
49 | ||
3183dbb0 | 50 | DBG2("Config file path found: %s", path); |
cd80958d | 51 | DBG("Session name found: %s", session_name); |
f3ed775e | 52 | return session_name; |
3183dbb0 DG |
53 | |
54 | error: | |
55 | return NULL; | |
f3ed775e | 56 | } |
679b4943 SM |
57 | |
58 | ||
59 | /* | |
60 | * list_cmd_options | |
61 | * | |
62 | * Prints a simple list of the options available to a command. This is intended | |
63 | * to be easily parsed for bash completion. | |
64 | */ | |
65 | void list_cmd_options(FILE *ofp, struct poptOption *options) | |
66 | { | |
67 | int i; | |
68 | struct poptOption *option = NULL; | |
69 | ||
70 | for (i = 0; options[i].longName != NULL; i++) { | |
71 | option = &options[i]; | |
72 | ||
73 | fprintf(ofp, "--%s\n", option->longName); | |
74 | ||
75 | if (isprint(option->shortName)) { | |
76 | fprintf(ofp, "-%c\n", option->shortName); | |
77 | } | |
78 | } | |
79 | } | |
8ce58bad MD |
80 | |
81 | /* | |
82 | * fls: returns the position of the most significant bit. | |
83 | * Returns 0 if no bit is set, else returns the position of the most | |
84 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
85 | */ | |
86 | #if defined(__i386) || defined(__x86_64) | |
87 | static inline | |
88 | unsigned int fls_u32(uint32_t x) | |
89 | { | |
90 | int r; | |
91 | ||
92 | asm("bsrl %1,%0\n\t" | |
93 | "jnz 1f\n\t" | |
94 | "movl $-1,%0\n\t" | |
95 | "1:\n\t" | |
96 | : "=r" (r) : "rm" (x)); | |
97 | return r + 1; | |
98 | } | |
99 | #define HAS_FLS_U32 | |
100 | #endif | |
101 | ||
102 | #if defined(__x86_64) | |
103 | static inline | |
104 | unsigned int fls_u64(uint64_t x) | |
105 | { | |
106 | long r; | |
107 | ||
108 | asm("bsrq %1,%0\n\t" | |
109 | "jnz 1f\n\t" | |
110 | "movq $-1,%0\n\t" | |
111 | "1:\n\t" | |
112 | : "=r" (r) : "rm" (x)); | |
113 | return r + 1; | |
114 | } | |
115 | #define HAS_FLS_U64 | |
116 | #endif | |
117 | ||
118 | #ifndef HAS_FLS_U64 | |
119 | static __attribute__((unused)) | |
120 | unsigned int fls_u64(uint64_t x) | |
121 | { | |
122 | unsigned int r = 64; | |
123 | ||
124 | if (!x) | |
125 | return 0; | |
126 | ||
127 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
128 | x <<= 32; | |
129 | r -= 32; | |
130 | } | |
131 | if (!(x & 0xFFFF000000000000ULL)) { | |
132 | x <<= 16; | |
133 | r -= 16; | |
134 | } | |
135 | if (!(x & 0xFF00000000000000ULL)) { | |
136 | x <<= 8; | |
137 | r -= 8; | |
138 | } | |
139 | if (!(x & 0xF000000000000000ULL)) { | |
140 | x <<= 4; | |
141 | r -= 4; | |
142 | } | |
143 | if (!(x & 0xC000000000000000ULL)) { | |
144 | x <<= 2; | |
145 | r -= 2; | |
146 | } | |
147 | if (!(x & 0x8000000000000000ULL)) { | |
148 | x <<= 1; | |
149 | r -= 1; | |
150 | } | |
151 | return r; | |
152 | } | |
153 | #endif | |
154 | ||
155 | #ifndef HAS_FLS_U32 | |
156 | static __attribute__((unused)) | |
157 | unsigned int fls_u32(uint32_t x) | |
158 | { | |
159 | unsigned int r = 32; | |
160 | ||
161 | if (!x) | |
162 | return 0; | |
163 | if (!(x & 0xFFFF0000U)) { | |
164 | x <<= 16; | |
165 | r -= 16; | |
166 | } | |
167 | if (!(x & 0xFF000000U)) { | |
168 | x <<= 8; | |
169 | r -= 8; | |
170 | } | |
171 | if (!(x & 0xF0000000U)) { | |
172 | x <<= 4; | |
173 | r -= 4; | |
174 | } | |
175 | if (!(x & 0xC0000000U)) { | |
176 | x <<= 2; | |
177 | r -= 2; | |
178 | } | |
179 | if (!(x & 0x80000000U)) { | |
180 | x <<= 1; | |
181 | r -= 1; | |
182 | } | |
183 | return r; | |
184 | } | |
185 | #endif | |
186 | ||
187 | static | |
188 | unsigned int fls_ulong(unsigned long x) | |
189 | { | |
190 | #if (CAA_BITS_PER_LONG == 32) | |
191 | return fls_u32(x); | |
192 | #else | |
193 | return fls_u64(x); | |
194 | #endif | |
195 | } | |
196 | ||
197 | /* | |
198 | * Return the minimum order for which x <= (1UL << order). | |
199 | * Return -1 if x is 0. | |
200 | */ | |
201 | int get_count_order_u32(uint32_t x) | |
202 | { | |
203 | if (!x) | |
204 | return -1; | |
205 | ||
206 | return fls_u32(x - 1); | |
207 | } | |
208 | ||
209 | /* | |
210 | * Return the minimum order for which x <= (1UL << order). | |
211 | * Return -1 if x is 0. | |
212 | */ | |
213 | int get_count_order_u64(uint64_t x) | |
214 | { | |
215 | if (!x) | |
216 | return -1; | |
217 | ||
218 | return fls_u64(x - 1); | |
219 | } | |
220 | ||
221 | /* | |
222 | * Return the minimum order for which x <= (1UL << order). | |
223 | * Return -1 if x is 0. | |
224 | */ | |
225 | int get_count_order_ulong(unsigned long x) | |
226 | { | |
227 | if (!x) | |
228 | return -1; | |
229 | ||
230 | return fls_ulong(x - 1); | |
231 | } |