cutils.c

   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 /*
  28  * fill first 'len' characters of 'buff' with pruned
  29  * contents of 'str' delimited by the character 'c'.
  30  * Escape character '\' is pruned off.
  31  * Return pointer to the delimiting character.
  32  */
  33 const char *fill_token(char *buf, const int len, const char *str, const char c)
  34 {
  35     const char *p=str;
  36     char *q=buf;
  37
  38     while (p < str+len-1) {
  39     if (*p == c)
  40         break;
  41         if (*p == '\\') {
  42             p++;
  43             if (*p == '\0')
  44                 break;
  45         }
  46         *q++ = *p++;
  47     }
  48     *q='\0';
  49     return p;
  50 }
  51
  52
  53 void pstrcpy(char *buf, int buf_size, const char *str)
  54 {
  55     int c;
  56     char *q = buf;
  57
  58     if (buf_size <= 0)
  59         return;
  60
  61     for(;;) {
  62         c = *str++;
  63         if (c == 0 || q >= buf + buf_size - 1)
  64             break;
  65         *q++ = c;
  66     }
  67     *q = '\0';
  68 }
  69
  70 /* strcat and truncate. */
  71 char *pstrcat(char *buf, int buf_size, const char *s)
  72 {
  73     int len;
  74     len = strlen(buf);
  75     if (len < buf_size)
  76         pstrcpy(buf + len, buf_size - len, s);
  77     return buf;
  78 }
  79
  80 int strstart(const char *str, const char *val, const char **ptr)
  81 {
  82     const char *p, *q;
  83     p = str;
  84     q = val;
  85     while (*q != '\0') {
  86         if (*p != *q)
  87             return 0;
  88         p++;
  89         q++;
  90     }
  91     if (ptr)
  92         *ptr = p;
  93     return 1;
  94 }
  95
  96 int stristart(const char *str, const char *val, const char **ptr)
  97 {
  98     const char *p, *q;
  99     p = str;
 100     q = val;
 101     while (*q != '\0') {
 102         if (qemu_toupper(*p) != qemu_toupper(*q))
 103             return 0;
 104         p++;
 105         q++;
 106     }
 107     if (ptr)
 108         *ptr = p;
 109     return 1;
 110 }
 111
 112 /* XXX: use host strnlen if available ? */
 113 int qemu_strnlen(const char *s, int max_len)
 114 {
 115     int i;
 116
 117     for(i = 0; i < max_len; i++) {
 118         if (s[i] == '\0') {
 119             break;
 120         }
 121     }
 122     return i;
 123 }
 124
 125 time_t mktimegm(struct tm *tm)
 126 {
 127     time_t t;
 128     int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
 129     if (m < 3) {
 130         m += 12;
 131         y--;
 132     }
 133     t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
 134                  y / 400 - 719469);
 135     t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
 136     return t;
 137 }
 138
 139 int qemu_fls(int i)
 140 {
 141     return 32 - clz32(i);
 142 }
 143
 144 /* io vectors */
 145
 146 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint)
 147 {
 148     qiov->iov = qemu_malloc(alloc_hint * sizeof(struct iovec));
 149     qiov->niov = 0;
 150     qiov->nalloc = alloc_hint;
 151     qiov->size = 0;
 152 }
 153
 154 void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov)
 155 {
 156     int i;
 157
 158     qiov->iov = iov;
 159     qiov->niov = niov;
 160     qiov->nalloc = -1;
 161     qiov->size = 0;
 162     for (i = 0; i < niov; i++)
 163         qiov->size += iov[i].iov_len;
 164 }
 165
 166 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
 167 {
 168     assert(qiov->nalloc != -1);
 169
 170     if (qiov->niov == qiov->nalloc) {
 171         qiov->nalloc = 2 * qiov->nalloc + 1;
 172         qiov->iov = qemu_realloc(qiov->iov, qiov->nalloc * sizeof(struct iovec));
 173     }
 174     qiov->iov[qiov->niov].iov_base = base;
 175     qiov->iov[qiov->niov].iov_len = len;
 176     qiov->size += len;
 177     ++qiov->niov;
 178 }
 179
 180 void qemu_iovec_destroy(QEMUIOVector *qiov)
 181 {
 182     assert(qiov->nalloc != -1);
 183
 184     qemu_free(qiov->iov);
 185 }
 186
 187 void qemu_iovec_reset(QEMUIOVector *qiov)
 188 {
 189     assert(qiov->nalloc != -1);
 190
 191     qiov->niov = 0;
 192     qiov->size = 0;
 193 }
 194
 195 void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
 196 {
 197     uint8_t *p = (uint8_t *)buf;
 198     int i;
 199
 200     for (i = 0; i < qiov->niov; ++i) {
 201         memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
 202         p += qiov->iov[i].iov_len;
 203     }
 204 }
 205
 206 void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
 207 {
 208     const uint8_t *p = (const uint8_t *)buf;
 209     size_t copy;
 210     int i;
 211
 212     for (i = 0; i < qiov->niov && count; ++i) {
 213         copy = count;
 214         if (copy > qiov->iov[i].iov_len)
 215             copy = qiov->iov[i].iov_len;
 216         memcpy(qiov->iov[i].iov_base, p, copy);
 217         p     += copy;
 218         count -= copy;
 219     }
 220 }