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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> |
feb0f3e5 | 24 | #include <common/utils.h> |
f3ed775e | 25 | |
beb8c75a | 26 | #include "conf.h" |
679b4943 | 27 | #include "utils.h" |
f3ed775e | 28 | |
f3ed775e DG |
29 | /* |
30 | * get_session_name | |
31 | * | |
32 | * Return allocated string with the session name found in the config | |
33 | * directory. | |
34 | */ | |
35 | char *get_session_name(void) | |
36 | { | |
37 | char *path, *session_name = NULL; | |
38 | ||
39 | /* Get path to config file */ | |
feb0f3e5 | 40 | path = utils_get_home_dir(); |
f3ed775e DG |
41 | if (path == NULL) { |
42 | goto error; | |
43 | } | |
44 | ||
45 | /* Get session name from config */ | |
46 | session_name = config_read_session_name(path); | |
47 | if (session_name == NULL) { | |
58a97671 | 48 | goto error; |
f3ed775e DG |
49 | } |
50 | ||
3183dbb0 | 51 | DBG2("Config file path found: %s", path); |
cd80958d | 52 | DBG("Session name found: %s", session_name); |
f3ed775e | 53 | return session_name; |
3183dbb0 DG |
54 | |
55 | error: | |
56 | return NULL; | |
f3ed775e | 57 | } |
679b4943 SM |
58 | |
59 | ||
60 | /* | |
61 | * list_cmd_options | |
62 | * | |
63 | * Prints a simple list of the options available to a command. This is intended | |
64 | * to be easily parsed for bash completion. | |
65 | */ | |
66 | void list_cmd_options(FILE *ofp, struct poptOption *options) | |
67 | { | |
68 | int i; | |
69 | struct poptOption *option = NULL; | |
70 | ||
71 | for (i = 0; options[i].longName != NULL; i++) { | |
72 | option = &options[i]; | |
73 | ||
74 | fprintf(ofp, "--%s\n", option->longName); | |
75 | ||
76 | if (isprint(option->shortName)) { | |
77 | fprintf(ofp, "-%c\n", option->shortName); | |
78 | } | |
79 | } | |
80 | } | |
8ce58bad MD |
81 | |
82 | /* | |
83 | * fls: returns the position of the most significant bit. | |
84 | * Returns 0 if no bit is set, else returns the position of the most | |
85 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
86 | */ | |
87 | #if defined(__i386) || defined(__x86_64) | |
88 | static inline | |
89 | unsigned int fls_u32(uint32_t x) | |
90 | { | |
91 | int r; | |
92 | ||
93 | asm("bsrl %1,%0\n\t" | |
94 | "jnz 1f\n\t" | |
95 | "movl $-1,%0\n\t" | |
96 | "1:\n\t" | |
97 | : "=r" (r) : "rm" (x)); | |
98 | return r + 1; | |
99 | } | |
100 | #define HAS_FLS_U32 | |
101 | #endif | |
102 | ||
103 | #if defined(__x86_64) | |
104 | static inline | |
105 | unsigned int fls_u64(uint64_t x) | |
106 | { | |
107 | long r; | |
108 | ||
109 | asm("bsrq %1,%0\n\t" | |
110 | "jnz 1f\n\t" | |
111 | "movq $-1,%0\n\t" | |
112 | "1:\n\t" | |
113 | : "=r" (r) : "rm" (x)); | |
114 | return r + 1; | |
115 | } | |
116 | #define HAS_FLS_U64 | |
117 | #endif | |
118 | ||
119 | #ifndef HAS_FLS_U64 | |
120 | static __attribute__((unused)) | |
121 | unsigned int fls_u64(uint64_t x) | |
122 | { | |
123 | unsigned int r = 64; | |
124 | ||
125 | if (!x) | |
126 | return 0; | |
127 | ||
128 | if (!(x & 0xFFFFFFFF00000000ULL)) { | |
129 | x <<= 32; | |
130 | r -= 32; | |
131 | } | |
132 | if (!(x & 0xFFFF000000000000ULL)) { | |
133 | x <<= 16; | |
134 | r -= 16; | |
135 | } | |
136 | if (!(x & 0xFF00000000000000ULL)) { | |
137 | x <<= 8; | |
138 | r -= 8; | |
139 | } | |
140 | if (!(x & 0xF000000000000000ULL)) { | |
141 | x <<= 4; | |
142 | r -= 4; | |
143 | } | |
144 | if (!(x & 0xC000000000000000ULL)) { | |
145 | x <<= 2; | |
146 | r -= 2; | |
147 | } | |
148 | if (!(x & 0x8000000000000000ULL)) { | |
149 | x <<= 1; | |
150 | r -= 1; | |
151 | } | |
152 | return r; | |
153 | } | |
154 | #endif | |
155 | ||
156 | #ifndef HAS_FLS_U32 | |
157 | static __attribute__((unused)) | |
158 | unsigned int fls_u32(uint32_t x) | |
159 | { | |
160 | unsigned int r = 32; | |
161 | ||
162 | if (!x) | |
163 | return 0; | |
164 | if (!(x & 0xFFFF0000U)) { | |
165 | x <<= 16; | |
166 | r -= 16; | |
167 | } | |
168 | if (!(x & 0xFF000000U)) { | |
169 | x <<= 8; | |
170 | r -= 8; | |
171 | } | |
172 | if (!(x & 0xF0000000U)) { | |
173 | x <<= 4; | |
174 | r -= 4; | |
175 | } | |
176 | if (!(x & 0xC0000000U)) { | |
177 | x <<= 2; | |
178 | r -= 2; | |
179 | } | |
180 | if (!(x & 0x80000000U)) { | |
181 | x <<= 1; | |
182 | r -= 1; | |
183 | } | |
184 | return r; | |
185 | } | |
186 | #endif | |
187 | ||
188 | static | |
189 | unsigned int fls_ulong(unsigned long x) | |
190 | { | |
191 | #if (CAA_BITS_PER_LONG == 32) | |
192 | return fls_u32(x); | |
193 | #else | |
194 | return fls_u64(x); | |
195 | #endif | |
196 | } | |
197 | ||
198 | /* | |
199 | * Return the minimum order for which x <= (1UL << order). | |
200 | * Return -1 if x is 0. | |
201 | */ | |
202 | int get_count_order_u32(uint32_t x) | |
203 | { | |
204 | if (!x) | |
205 | return -1; | |
206 | ||
207 | return fls_u32(x - 1); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Return the minimum order for which x <= (1UL << order). | |
212 | * Return -1 if x is 0. | |
213 | */ | |
214 | int get_count_order_u64(uint64_t x) | |
215 | { | |
216 | if (!x) | |
217 | return -1; | |
218 | ||
219 | return fls_u64(x - 1); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Return the minimum order for which x <= (1UL << order). | |
224 | * Return -1 if x is 0. | |
225 | */ | |
226 | int get_count_order_ulong(unsigned long x) | |
227 | { | |
228 | if (!x) | |
229 | return -1; | |
230 | ||
231 | return fls_ulong(x - 1); | |
232 | } |