bellard | 18607dc | 2007-01-07 22:04:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Simple C functions to supplement the C library |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | 18607dc | 2007-01-07 22:04:40 +0000 | [diff] [blame] | 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 | */ |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 24 | #include "qemu-common.h" |
aliguori | 8d371d4 | 2008-12-04 20:08:06 +0000 | [diff] [blame] | 25 | #include "host-utils.h" |
bellard | 18607dc | 2007-01-07 22:04:40 +0000 | [diff] [blame] | 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); |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 49 | if (len < buf_size) |
bellard | 18607dc | 2007-01-07 22:04:40 +0000 | [diff] [blame] | 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') { |
blueswir1 | cd39008 | 2008-11-16 13:53:32 +0000 | [diff] [blame] | 76 | if (qemu_toupper(*p) != qemu_toupper(*q)) |
bellard | 18607dc | 2007-01-07 22:04:40 +0000 | [diff] [blame] | 77 | return 0; |
| 78 | p++; |
| 79 | q++; |
| 80 | } |
| 81 | if (ptr) |
| 82 | *ptr = p; |
| 83 | return 1; |
| 84 | } |
bellard | 3c6b208 | 2007-11-10 19:36:39 +0000 | [diff] [blame] | 85 | |
Blue Swirl | d43277c | 2009-07-01 18:24:44 +0000 | [diff] [blame] | 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 | |
bellard | 3c6b208 | 2007-11-10 19:36:39 +0000 | [diff] [blame] | 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 | } |
aliguori | b39ade8 | 2008-12-04 19:19:45 +0000 | [diff] [blame] | 112 | |
blueswir1 | ad46db9 | 2008-12-11 19:37:54 +0000 | [diff] [blame] | 113 | int qemu_fls(int i) |
aliguori | b39ade8 | 2008-12-04 19:19:45 +0000 | [diff] [blame] | 114 | { |
aliguori | 8d371d4 | 2008-12-04 20:08:06 +0000 | [diff] [blame] | 115 | return 32 - clz32(i); |
aliguori | b39ade8 | 2008-12-04 19:19:45 +0000 | [diff] [blame] | 116 | } |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 117 | |
Christoph Hellwig | 6f1953c | 2009-09-04 19:01:32 +0200 | [diff] [blame] | 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 | { |
Blue Swirl | 5f6b9e8 | 2009-09-20 06:56:26 +0000 | [diff] [blame] | 127 | #ifdef CONFIG_FDATASYNC |
Christoph Hellwig | 6f1953c | 2009-09-04 19:01:32 +0200 | [diff] [blame] | 128 | return fdatasync(fd); |
| 129 | #else |
| 130 | return fsync(fd); |
| 131 | #endif |
| 132 | } |
| 133 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 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; |
aliguori | 249aa74 | 2009-01-26 17:17:52 +0000 | [diff] [blame] | 141 | qiov->size = 0; |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 142 | } |
| 143 | |
aliguori | 522584a | 2009-03-28 17:46:10 +0000 | [diff] [blame] | 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 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 156 | void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len) |
| 157 | { |
aliguori | 522584a | 2009-03-28 17:46:10 +0000 | [diff] [blame] | 158 | assert(qiov->nalloc != -1); |
| 159 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 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; |
aliguori | 249aa74 | 2009-01-26 17:17:52 +0000 | [diff] [blame] | 166 | qiov->size += len; |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 167 | ++qiov->niov; |
| 168 | } |
| 169 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 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 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 195 | void qemu_iovec_destroy(QEMUIOVector *qiov) |
| 196 | { |
aliguori | 522584a | 2009-03-28 17:46:10 +0000 | [diff] [blame] | 197 | assert(qiov->nalloc != -1); |
| 198 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 199 | qemu_free(qiov->iov); |
| 200 | } |
| 201 | |
aliguori | be95946 | 2009-02-05 21:23:54 +0000 | [diff] [blame] | 202 | void qemu_iovec_reset(QEMUIOVector *qiov) |
| 203 | { |
aliguori | 522584a | 2009-03-28 17:46:10 +0000 | [diff] [blame] | 204 | assert(qiov->nalloc != -1); |
| 205 | |
aliguori | be95946 | 2009-02-05 21:23:54 +0000 | [diff] [blame] | 206 | qiov->niov = 0; |
| 207 | qiov->size = 0; |
| 208 | } |
| 209 | |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 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 | |
aliguori | 249aa74 | 2009-01-26 17:17:52 +0000 | [diff] [blame] | 221 | void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count) |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 222 | { |
| 223 | const uint8_t *p = (const uint8_t *)buf; |
aliguori | 249aa74 | 2009-01-26 17:17:52 +0000 | [diff] [blame] | 224 | size_t copy; |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 225 | int i; |
| 226 | |
aliguori | 249aa74 | 2009-01-26 17:17:52 +0000 | [diff] [blame] | 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; |
aliguori | 44e3ee8 | 2009-01-22 16:59:20 +0000 | [diff] [blame] | 234 | } |
| 235 | } |