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#include <unistd.h>
#include "util.h"
int xread(int fd, void *buf, int len)
{
int n = 0;
int r;
while ((r = read(fd, buf + n, len - n)) > 0)
n += r;
return n;
}
int xwrite(int fd, void *buf, int len)
{
int n = 0;
int w;
while ((w = write(fd, buf + n, len - n)) > 0)
n += w;
return n;
}
static int readutf8(char **src)
{
int result;
int l = 1;
char *s = *src;
while (l < 6 && (unsigned char) *s & (0x40 >> l))
l++;
result = (0x3f >> l) & (unsigned char) *s++;
while (l--)
result = (result << 6) | ((unsigned char) *s++ & 0x3f);
*src = s;
return result;
}
void utf8_dec(int *dst, char *src)
{
char *s = src;
int *d = dst;
while (*s) {
if (!(~(unsigned char) *s & 0xc0))
*d++ = readutf8(&s);
else
*d++ = *s++;
}
*d = '\0';
}
static void writeutf8(char **dst, int c)
{
char *d = *dst;
int l = 0;
if (c > 0xffff) {
*d++ = 0xf0 | (c >> 18);
l = 3;
} else if (c > 0x7ff) {
*d++ = 0xe0 | (c >> 12);
l = 2;
} else if (c > 0x7f) {
*d++ = 0xc0 | (c >> 6);
l = 1;
}
while (l--)
*d++ = 0x80 | (c >> (l * 6)) & 0x3f;
*dst = d;
}
void utf8_enc(char *dst, int *src)
{
int *s = src;
char *d = dst;
while (*s) {
if (*s & ~0x7f)
writeutf8(&d, *s++);
else
*d++ = *s++;
}
*d = '\0';
}
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