Big-5 Fundamental Functions (Big5.c)
/* Define some fundamental I/O functions for Big5 code */
#include "Big5.h"
/* Very naive version of getting a Big5 code from a FILE.
Once a character is in the first Big5 byte range, this function
assumes a Big5 code is present. If your input file is definitely
save, ie, it is definitely a plain ASCII + Big5 text file, use this
version.
See LOG file for change logs.
*/
Big5 fgetc5(FILE *fp) {
Big5 code=0;
int c;
c = fgetc(fp);
if (isfirst(c)) code = (c << 8) + fgetc(fp);
else if (c == EOF)
code = EOF;
else
code = c;
return code;
}
/* Same function as fgetc5(), but not as naive. This function checks
both bytes, if they are both in the range of Big5 code range,
then take as a Big5 character. Otherwise treat them as two
Latin-1 characters.
*/
Big5 fgetbig5(FILE *fp) {
Big5 code=0;
int c, d;
c = fgetc(fp);
if (isfirst(c)) {
d = fgetc(fp);
if (issecond(d))
code = (c << 8) + d;
else {
code = c;
ungetc(d, fp);
}
}
else if (c == EOF)
code = EOF;
else
code = c;
return code;
}
/* Put a Big5 code out to a FILE. If it fails to write, return EOF.
Otherwise it returns the width of the character: 1 for ASCII and
2 for Big5.
*/
int fputc5(Big5 c, FILE *fp) {
char x = ((c & 0xFF00) >> 8);
if (x) {
fputc(x, fp);
return ((fputc((c & 0x00FF), fp) == EOF)? EOF : 2);
}
else
return ((fputc((c & 0x00FF), fp) == EOF)? EOF : 1);
}
/* About the pronunciation and tone symbols */
int isphon(Big5 c) {
int n;
if (getfirst(c) == 0xA3) {
if ((n=getsecond(c)) > 0x73) {
((n < 0x7F) ? (n -= 0x74) : (n = n - 0xA0 + 10));
if (n < 37) n += 6;
else if (n < 42) n -= 36;
else n = 0;
}
}
else n = 0;
return n;
}
Big5 phon(int n) {
Big5 c;
if ((n < 43) && (n > 0)) {
c = (0xA3)<<8;
if (n < 6) c += (n+0xBA);
else if (n < 17) c += (n+110);
else c += (n+144);
}
else c = ((0xA1)<<8) | 0xBC;
return c;
}
/* About the linear order of Big-5 codes */
int linear(Big5 c) {
int x, y, n;
x = getfirst(c);
y = getsecond(c);
if ((x >= 164) && (x <= 198)) {
y -= ( (y > 126) ? (161 - 63) : 64 );
n = (x - 164) * 157 + y;
}
else if ((x >= 201) && (x <= 249)) {
y -= ( (y > 126) ? (161 - 63) : 64 );
n = (x - 201) * 157 + y + 5401;
}
else n = -1;
return n;
}
Big5 b5(int n) {
int x, y;
if ((n>=0) && (n<5401)) {
x = n/157 + 164;
n %= 157;
y = (n < 63) ? (n + 64) : (n - 63 + 161);
}
else if (n<13060) {
n -= 5401;
x = n/157 + 201;
n %= 157;
y = (n < 63) ? (n + 64) : (n - 63 + 161);
}
else {
x = 0xA1;
y = 0xBC;
}
return (x<<8)+y;
}
Created: Nov 17, 1996