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 time_t mktimegm(struct tm *tm)

    87 {

    88     time_t t;

    89     int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;

    90     if (m < 3) {

    91         m += 12;

    92         y--;

    93     }

    94     t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + 

    95                  y / 400 - 719469);

    96     t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;

    97     return t;

    98 }

    99 

   100 int uninterrupted_open (const char *pathname, int flags, int mode)

   101 {

   102     int ret;

   103 

   104     do

   105 	ret = open(pathname, flags, mode);

   106     while (ret == -1 && (errno == EINTR || errno == EAGAIN));

   107     

   108     return ret;

   109 }

   110 

   111 int uninterrupted_close (int fd)

   112 {

   113     int ret;

   114 

   115     do

   116 	ret = close(fd);

   117     while (ret == -1 && (errno == EINTR || errno == EAGAIN));

   118 

   119     return ret;

   120 }

   121 

   122 int uninterrupted_read(int fd, void *buf, size_t count)

   123 {

   124     size_t bytes = 0;

   125 

   126     bytes = 0;

   127     do {

   128 	int ret = read(fd, 

   129 		       ((char *)buf) + bytes, 

   130 		       count - bytes);

   131 	if (ret == -1) {

   132 	     if (errno == EINTR || errno == EAGAIN)

   133 		 continue;

   134 	     return -1;

   135 	}

   136 	if (ret == 0)

   137 	    break;

   138 	bytes += ret;

   139     } while (bytes != count);

   140 

   141     return bytes;

   142 }

   143 

   144 int uninterrupted_write(int fd, void *buf, size_t count)

   145 {

   146     size_t bytes = 0;

   147     

   148     do {

   149 	int ret = write(fd, 

   150 			((char *)buf) + bytes, 

   151 			count - bytes);

   152 	if (ret == -1) {

   153 	    if (errno == EINTR || errno == EAGAIN)

   154 		continue;

   155 	    return -1;

   156 	}

   157 	bytes += ret;

   158     } while (bytes != count);

   159 

   160     return bytes;

   161 }

   162 

   163 int qemu_fls(int i)

   164 {

   165     return 32 - clz32(i);

   166 }