/*
 * 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);
}