/*

 * 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;

}

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

{

    int ret;

    do

	ret = open(pathname, flags, mode);

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

    return ret;

}

int uninterrupted_close (int fd)

{

    int ret;

    do

	ret = close(fd);

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

    return ret;

}

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

{

    size_t bytes = 0;

    bytes = 0;

    do {

	int ret = read(fd, 

		       ((char *)buf) + bytes, 

		       count - bytes);

	if (ret == -1) {

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

		 continue;

	     return -1;

	}

	if (ret == 0)

	    break;

	bytes += ret;

    } while (bytes != count);

    return bytes;

}

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

{

    size_t bytes = 0;

    do {

	int ret = write(fd, 

			((char *)buf) + bytes, 

			count - bytes);

	if (ret == -1) {

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

		continue;

	    return -1;

	}

	bytes += ret;

    } while (bytes != count);

    return bytes;

}

int qemu_fls(int i)

{

    return 32 - clz32(i);

}