aboutsummaryrefslogtreecommitdiffstats
path: root/cutils.c
blob: 036ae3ce317805089ff772818ee746402989923b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/*
 * Simple C functions to supplement the C library
 *
 * Copyright (c) 2006 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "qemu-common.h"
#include "host-utils.h"

void pstrcpy(char *buf, int buf_size, const char *str)
{
    int c;
    char *q = buf;

    if (buf_size <= 0)
        return;

    for(;;) {
        c = *str++;
        if (c == 0 || q >= buf + buf_size - 1)
            break;
        *q++ = c;
    }
    *q = '\0';
}

/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
    int len;
    len = strlen(buf);
    if (len < buf_size)
        pstrcpy(buf + len, buf_size - len, s);
    return buf;
}

int strstart(const char *str, const char *val, const char **ptr)
{
    const char *p, *q;
    p = str;
    q = val;
    while (*q != '\0') {
        if (*p != *q)
            return 0;
        p++;
        q++;
    }
    if (ptr)
        *ptr = p;
    return 1;
}

int stristart(const char *str, const char *val, const char **ptr)
{
    const char *p, *q;
    p = str;
    q = val;
    while (*q != '\0') {
        if (qemu_toupper(*p) != qemu_toupper(*q))
            return 0;
        p++;
        q++;
    }
    if (ptr)
        *ptr = p;
    return 1;
}

/* XXX: use host strnlen if available ? */
int qemu_strnlen(const char *s, int max_len)
{
    int i;

    for(i = 0; i < max_len; i++) {
        if (s[i] == '\0') {
            break;
        }
    }
    return i;
}

time_t mktimegm(struct tm *tm)
{
    time_t t;
    int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
    if (m < 3) {
        m += 12;
        y--;
    }
    t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + 
                 y / 400 - 719469);
    t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
    return t;
}

int qemu_fls(int i)
{
    return 32 - clz32(i);
}

/*
 * Make sure data goes on disk, but if possible do not bother to
 * write out the inode just for timestamp updates.
 *
 * Unfortunately even in 2009 many operating systems do not support
 * fdatasync and have to fall back to fsync.
 */
int qemu_fdatasync(int fd)
{
#ifdef CONFIG_FDATASYNC
    return fdatasync(fd);
#else
    return fsync(fd);
#endif
}

/* io vectors */

void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
{
    qiov->iov = qemu_malloc(alloc_hint * sizeof(struct iovec));
    qiov->niov = 0;
    qiov->nalloc = alloc_hint;
    qiov->size = 0;
}

void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
{
    int i;

    qiov->iov = iov;
    qiov->niov = niov;
    qiov->nalloc = -1;
    qiov->size = 0;
    for (i = 0; i < niov; i++)
        qiov->size += iov[i].iov_len;
}

void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
{
    assert(qiov->nalloc != -1);

    if (qiov->niov == qiov->nalloc) {
        qiov->nalloc = 2 * qiov->nalloc + 1;
        qiov->iov = qemu_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
    }
    qiov->iov[qiov->niov].iov_base = base;
    qiov->iov[qiov->niov].iov_len = len;
    qiov->size += len;
    ++qiov->niov;
}

/*
 * Copies iovecs from src to the end dst until src is completely copied or the
 * total size of the copied iovec reaches size. The size of the last copied
 * iovec is changed in order to fit the specified total size if it isn't a
 * perfect fit already.
 */
void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size)
{
    int i;
    size_t done;

    assert(dst->nalloc != -1);

    done = 0;
    for (i = 0; (i < src->niov) && (done != size); i++) {
        if (done + src->iov[i].iov_len > size) {
            qemu_iovec_add(dst, src->iov[i].iov_base, size - done);
            break;
        } else {
            qemu_iovec_add(dst, src->iov[i].iov_base, src->iov[i].iov_len);
        }
        done += src->iov[i].iov_len;
    }
}

void qemu_iovec_destroy(QEMUIOVector *qiov)
{
    assert(qiov->nalloc != -1);

    qemu_free(qiov->iov);
}

void qemu_iovec_reset(QEMUIOVector *qiov)
{
    assert(qiov->nalloc != -1);

    qiov->niov = 0;
    qiov->size = 0;
}

void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
{
    uint8_t *p = (uint8_t *)buf;
    int i;

    for (i = 0; i < qiov->niov; ++i) {
        memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
        p += qiov->iov[i].iov_len;
    }
}

void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
{
    const uint8_t *p = (const uint8_t *)buf;
    size_t copy;
    int i;

    for (i = 0; i < qiov->niov && count; ++i) {
        copy = count;
        if (copy > qiov->iov[i].iov_len)
            copy = qiov->iov[i].iov_len;
        memcpy(qiov->iov[i].iov_base, p, copy);
        p     += copy;
        count -= copy;
    }
}

#ifndef _WIN32
/* Sets a specific flag */
int fcntl_setfl(int fd, int flag)
{
    int flags;

    flags = fcntl(fd, F_GETFL);
    if (flags == -1)
        return -errno;

    if (fcntl(fd, F_SETFL, flags | flag) == -1)
        return -errno;

    return 0;
}
#endif