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#include "fitz.h"
int
fz_is_big_endian(void)
{
static const int one = 1;
return *(char*)&one == 0;
}
char *
fz_strsep(char **stringp, const char *delim)
{
char *ret = *stringp;
if (ret == NULL) return NULL;
if ((*stringp = strpbrk(*stringp, delim)) != NULL)
*((*stringp)++) = '\0';
return ret;
}
int
fz_strlcpy(char *dst, const char *src, int siz)
{
register char *d = dst;
register const char *s = src;
register int n = siz;
/* Copy as many bytes as will fit */
if (n != 0 && --n != 0) {
do {
if ((*d++ = *s++) == 0)
break;
} while (--n != 0);
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (siz != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return(s - src - 1); /* count does not include NUL */
}
int
fz_strlcat(char *dst, const char *src, int siz)
{
register char *d = dst;
register const char *s = src;
register int n = siz;
int dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (*d != '\0' && n-- != 0)
d++;
dlen = d - dst;
n = siz - dlen;
if (n == 0)
return dlen + strlen(s);
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
n--;
}
s++;
}
*d = '\0';
return dlen + (s - src); /* count does not include NUL */
}
enum
{
UTFmax = 4, /* maximum bytes per rune */
Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */
Runeself = 0x80, /* rune and UTF sequences are the same (<) */
Runeerror = 0xFFFD, /* decoding error in UTF */
Runemax = 0x10FFFF, /* maximum rune value */
};
enum
{
Bit1 = 7,
Bitx = 6,
Bit2 = 5,
Bit3 = 4,
Bit4 = 3,
Bit5 = 2,
T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */
Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */
T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */
T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */
T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */
T5 = ((1<<(Bit5+1))-1) ^ 0xFF, /* 1111 1000 */
Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0111 1111 */
Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0111 1111 1111 */
Rune3 = (1<<(Bit3+2*Bitx))-1, /* 1111 1111 1111 1111 */
Rune4 = (1<<(Bit4+3*Bitx))-1, /* 0001 1111 1111 1111 1111 1111 */
Maskx = (1<<Bitx)-1, /* 0011 1111 */
Testx = Maskx ^ 0xFF, /* 1100 0000 */
Bad = Runeerror,
};
int
chartorune(int *rune, char *str)
{
int c, c1, c2, c3;
long l;
/*
* one character sequence
* 00000-0007F => T1
*/
c = *(unsigned char*)str;
if(c < Tx) {
*rune = c;
return 1;
}
/*
* two character sequence
* 0080-07FF => T2 Tx
*/
c1 = *(unsigned char*)(str+1) ^ Tx;
if(c1 & Testx)
goto bad;
if(c < T3) {
if(c < T2)
goto bad;
l = ((c << Bitx) | c1) & Rune2;
if(l <= Rune1)
goto bad;
*rune = l;
return 2;
}
/*
* three character sequence
* 0800-FFFF => T3 Tx Tx
*/
c2 = *(unsigned char*)(str+2) ^ Tx;
if(c2 & Testx)
goto bad;
if(c < T4) {
l = ((((c << Bitx) | c1) << Bitx) | c2) & Rune3;
if(l <= Rune2)
goto bad;
*rune = l;
return 3;
}
/*
* four character sequence (21-bit value)
* 10000-1FFFFF => T4 Tx Tx Tx
*/
c3 = *(unsigned char*)(str+3) ^ Tx;
if (c3 & Testx)
goto bad;
if (c < T5) {
l = ((((((c << Bitx) | c1) << Bitx) | c2) << Bitx) | c3) & Rune4;
if (l <= Rune3)
goto bad;
*rune = l;
return 4;
}
/*
* Support for 5-byte or longer UTF-8 would go here, but
* since we don't have that, we'll just fall through to bad.
*/
/*
* bad decoding
*/
bad:
*rune = Bad;
return 1;
}
int
runetochar(char *str, int *rune)
{
/* Runes are signed, so convert to unsigned for range check. */
unsigned long c;
/*
* one character sequence
* 00000-0007F => 00-7F
*/
c = *rune;
if(c <= Rune1) {
str[0] = c;
return 1;
}
/*
* two character sequence
* 0080-07FF => T2 Tx
*/
if(c <= Rune2) {
str[0] = T2 | (c >> 1*Bitx);
str[1] = Tx | (c & Maskx);
return 2;
}
/*
* If the Rune is out of range, convert it to the error rune.
* Do this test here because the error rune encodes to three bytes.
* Doing it earlier would duplicate work, since an out of range
* Rune wouldn't have fit in one or two bytes.
*/
if (c > Runemax)
c = Runeerror;
/*
* three character sequence
* 0800-FFFF => T3 Tx Tx
*/
if (c <= Rune3) {
str[0] = T3 | (c >> 2*Bitx);
str[1] = Tx | ((c >> 1*Bitx) & Maskx);
str[2] = Tx | (c & Maskx);
return 3;
}
/*
* four character sequence (21-bit value)
* 10000-1FFFFF => T4 Tx Tx Tx
*/
str[0] = T4 | (c >> 3*Bitx);
str[1] = Tx | ((c >> 2*Bitx) & Maskx);
str[2] = Tx | ((c >> 1*Bitx) & Maskx);
str[3] = Tx | (c & Maskx);
return 4;
}
int
runelen(int c)
{
char str[10];
return runetochar(str, &c);
}
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