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1 /*
2 * Simple C functions to supplement the C library
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu-common.h"
25 #include "host-utils.h"
26
27 void pstrcpy(char *buf, int buf_size, const char *str)
28 {
29 int c;
30 char *q = buf;
31
32 if (buf_size <= 0)
33 return;
34
35 for(;;) {
36 c = *str++;
37 if (c == 0 || q >= buf + buf_size - 1)
38 break;
39 *q++ = c;
40 }
41 *q = '\0';
42 }
43
44 /* strcat and truncate. */
45 char *pstrcat(char *buf, int buf_size, const char *s)
46 {
47 int len;
48 len = strlen(buf);
49 if (len < buf_size)
50 pstrcpy(buf + len, buf_size - len, s);
51 return buf;
52 }
53
54 int strstart(const char *str, const char *val, const char **ptr)
55 {
56 const char *p, *q;
57 p = str;
58 q = val;
59 while (*q != '\0') {
60 if (*p != *q)
61 return 0;
62 p++;
63 q++;
64 }
65 if (ptr)
66 *ptr = p;
67 return 1;
68 }
69
70 int stristart(const char *str, const char *val, const char **ptr)
71 {
72 const char *p, *q;
73 p = str;
74 q = val;
75 while (*q != '\0') {
76 if (qemu_toupper(*p) != qemu_toupper(*q))
77 return 0;
78 p++;
79 q++;
80 }
81 if (ptr)
82 *ptr = p;
83 return 1;
84 }
85
86 /* XXX: use host strnlen if available ? */
87 int qemu_strnlen(const char *s, int max_len)
88 {
89 int i;
90
91 for(i = 0; i < max_len; i++) {
92 if (s[i] == '\0') {
93 break;
94 }
95 }
96 return i;
97 }
98
99 time_t mktimegm(struct tm *tm)
100 {
101 time_t t;
102 int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
103 if (m < 3) {
104 m += 12;
105 y--;
106 }
107 t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
108 y / 400 - 719469);
109 t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
110 return t;
111 }
112
113 int qemu_fls(int i)
114 {
115 return 32 - clz32(i);
116 }
117
118 /*
119 * Make sure data goes on disk, but if possible do not bother to
120 * write out the inode just for timestamp updates.
121 *
122 * Unfortunately even in 2009 many operating systems do not support
123 * fdatasync and have to fall back to fsync.
124 */
125 int qemu_fdatasync(int fd)
126 {
127 #ifdef CONFIG_FDATASYNC
128 return fdatasync(fd);
129 #else
130 return fsync(fd);
131 #endif
132 }
133
134 /* io vectors */
135
136 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
137 {
138 qiov->iov = qemu_malloc(alloc_hint * sizeof(struct iovec));
139 qiov->niov = 0;
140 qiov->nalloc = alloc_hint;
141 qiov->size = 0;
142 }
143
144 void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
145 {
146 int i;
147
148 qiov->iov = iov;
149 qiov->niov = niov;
150 qiov->nalloc = -1;
151 qiov->size = 0;
152 for (i = 0; i < niov; i++)
153 qiov->size += iov[i].iov_len;
154 }
155
156 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
157 {
158 assert(qiov->nalloc != -1);
159
160 if (qiov->niov == qiov->nalloc) {
161 qiov->nalloc = 2 * qiov->nalloc + 1;
162 qiov->iov = qemu_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
163 }
164 qiov->iov[qiov->niov].iov_base = base;
165 qiov->iov[qiov->niov].iov_len = len;
166 qiov->size += len;
167 ++qiov->niov;
168 }
169
170 /*
171 * Copies iovecs from src to the end dst until src is completely copied or the
172 * total size of the copied iovec reaches size. The size of the last copied
173 * iovec is changed in order to fit the specified total size if it isn't a
174 * perfect fit already.
175 */
176 void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size)
177 {
178 int i;
179 size_t done;
180
181 assert(dst->nalloc != -1);
182
183 done = 0;
184 for (i = 0; (i < src->niov) && (done != size); i++) {
185 if (done + src->iov[i].iov_len > size) {
186 qemu_iovec_add(dst, src->iov[i].iov_base, size - done);
187 break;
188 } else {
189 qemu_iovec_add(dst, src->iov[i].iov_base, src->iov[i].iov_len);
190 }
191 done += src->iov[i].iov_len;
192 }
193 }
194
195 void qemu_iovec_destroy(QEMUIOVector *qiov)
196 {
197 assert(qiov->nalloc != -1);
198
199 qemu_free(qiov->iov);
200 }
201
202 void qemu_iovec_reset(QEMUIOVector *qiov)
203 {
204 assert(qiov->nalloc != -1);
205
206 qiov->niov = 0;
207 qiov->size = 0;
208 }
209
210 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
211 {
212 uint8_t *p = (uint8_t *)buf;
213 int i;
214
215 for (i = 0; i < qiov->niov; ++i) {
216 memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
217 p += qiov->iov[i].iov_len;
218 }
219 }
220
221 void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
222 {
223 const uint8_t *p = (const uint8_t *)buf;
224 size_t copy;
225 int i;
226
227 for (i = 0; i < qiov->niov && count; ++i) {
228 copy = count;
229 if (copy > qiov->iov[i].iov_len)
230 copy = qiov->iov[i].iov_len;
231 memcpy(qiov->iov[i].iov_base, p, copy);
232 p += copy;
233 count -= copy;
234 }
235 }
236
237 #ifndef _WIN32
238 /* Sets a specific flag */
239 int fcntl_setfl(int fd, int flag)
240 {
241 int flags;
242
243 flags = fcntl(fd, F_GETFL);
244 if (flags == -1)
245 return -errno;
246
247 if (fcntl(fd, F_SETFL, flags | flag) == -1)
248 return -errno;
249
250 return 0;
251 }
252 #endif
253