ref: bc895417f804bbb78410a365412bcf8ab59a44b4
dir: /sys/src/cmd/tr.c/
#include <u.h>
#include <libc.h>
typedef struct PCB /* Control block controlling specification parse */
{
char *base; /* start of specification */
char *current; /* current parse point */
long last; /* last Rune returned */
long final; /* final Rune in a span */
} Pcb;
uchar bits[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
#define SETBIT(a, c) ((a)[(c)/8] |= bits[(c)&07])
#define CLEARBIT(a,c) ((a)[(c)/8] &= ~bits[(c)&07])
#define BITSET(a,c) ((a)[(c)/8] & bits[(c)&07])
uchar f[(Runemax+1)/8];
uchar t[(Runemax+1)/8];
char wbuf[4096];
char *wptr;
Pcb pfrom, pto;
int cflag;
int dflag;
int sflag;
void complement(void);
void delete(void);
void squeeze(void);
void translit(void);
long canon(Pcb*);
char *getrune(char*, Rune*);
void Pinit(Pcb*, char*);
void Prewind(Pcb *p);
int readrune(int, long*);
void wflush(int);
void writerune(int, Rune);
static void
usage(void)
{
fprint(2, "usage: %s [-cds] [string1 [string2]]\n", argv0);
exits("usage");
}
void
main(int argc, char **argv)
{
ARGBEGIN{
case 's': sflag++; break;
case 'd': dflag++; break;
case 'c': cflag++; break;
default: usage();
}ARGEND
if(argc>0)
Pinit(&pfrom, argv[0]);
if(argc>1)
Pinit(&pto, argv[1]);
if(argc>2)
usage();
if(dflag) {
if ((sflag && argc != 2) || (!sflag && argc != 1))
usage();
delete();
} else {
if (argc != 2)
usage();
if (cflag)
complement();
else translit();
}
exits(0);
}
void
delete(void)
{
long c, last;
if (cflag) {
memset((char *) f, 0xff, sizeof f);
while ((c = canon(&pfrom)) >= 0)
CLEARBIT(f, c);
} else {
while ((c = canon(&pfrom)) >= 0)
SETBIT(f, c);
}
if (sflag) {
while ((c = canon(&pto)) >= 0)
SETBIT(t, c);
}
last = Runemax+1;
while (readrune(0, &c) > 0) {
if(!BITSET(f, c) && (c != last || !BITSET(t,c))) {
last = c;
writerune(1, (Rune) c);
}
}
wflush(1);
}
void
complement(void)
{
Rune *p;
int i;
long from, to, lastc, high;
lastc = 0;
high = 0;
while ((from = canon(&pfrom)) >= 0) {
if (from > high) high = from;
SETBIT(f, from);
}
while ((to = canon(&pto)) > 0) {
if (to > high) high = to;
SETBIT(t,to);
}
Prewind(&pto);
if ((p = (Rune *) malloc((high+1)*sizeof(Rune))) == 0)
sysfatal("no memory");
for (i = 0; i <= high; i++){
if (!BITSET(f,i)) {
if ((to = canon(&pto)) < 0)
to = lastc;
else lastc = to;
p[i] = to;
}
else p[i] = i;
}
if (sflag){
lastc = Runemax+1;
while (readrune(0, &from) > 0) {
if (from > high)
from = to;
else
from = p[from];
if (from != lastc || !BITSET(t,from)) {
lastc = from;
writerune(1, (Rune) from);
}
}
} else {
while (readrune(0, &from) > 0){
if (from > high)
from = to;
else
from = p[from];
writerune(1, (Rune) from);
}
}
wflush(1);
}
void
translit(void)
{
Rune *p;
int i;
long from, to, lastc, high;
lastc = 0;
high = 0;
while ((from = canon(&pfrom)) >= 0)
if (from > high) high = from;
Prewind(&pfrom);
if ((p = (Rune *) malloc((high+1)*sizeof(Rune))) == 0)
sysfatal("no memory");
for (i = 0; i <= high; i++)
p[i] = i;
while ((from = canon(&pfrom)) >= 0) {
if ((to = canon(&pto)) < 0)
to = lastc;
else lastc = to;
if (BITSET(f,from) && p[from] != to)
sysfatal("ambiguous translation");
SETBIT(f,from);
p[from] = to;
SETBIT(t,to);
}
while ((to = canon(&pto)) >= 0) {
SETBIT(t,to);
}
if (sflag){
lastc = Runemax+1;
while (readrune(0, &from) > 0) {
if (from <= high)
from = p[from];
if (from != lastc || !BITSET(t,from)) {
lastc = from;
writerune(1, (Rune) from);
}
}
} else {
while (readrune(0, &from) > 0) {
if (from <= high)
from = p[from];
writerune(1, (Rune) from);
}
}
wflush(1);
}
int
readrune(int fd, long *rp)
{
Rune r;
int j;
static int i, n;
static char buf[4096];
j = i;
for (;;) {
if (i >= n) {
wflush(1);
if (j != i)
memcpy(buf, buf+j, n-j);
i = n-j;
n = read(fd, &buf[i], sizeof(buf)-i);
if (n < 0)
sysfatal("read error: %r");
if (n == 0)
return 0;
j = 0;
n += i;
}
i++;
if (fullrune(&buf[j], i-j))
break;
}
chartorune(&r, &buf[j]);
*rp = r;
return 1;
}
void
writerune(int fd, Rune r)
{
char buf[UTFmax];
int n;
if (!wptr)
wptr = wbuf;
n = runetochar(buf, (Rune*)&r);
if (wptr+n >= wbuf+sizeof(wbuf))
wflush(fd);
memcpy(wptr, buf, n);
wptr += n;
}
void
wflush(int fd)
{
if (wptr && wptr > wbuf)
if (write(fd, wbuf, wptr-wbuf) != wptr-wbuf)
sysfatal("write error: %r");
wptr = wbuf;
}
char *
getrune(char *s, Rune *rp)
{
Rune r;
char *save;
int i, n;
s += chartorune(rp, s);
if((r = *rp) == '\\' && *s){
n = 0;
if (*s == 'x') {
s++;
for (i = 0; i < 4; i++) {
save = s;
s += chartorune(&r, s);
if ('0' <= r && r <= '9')
n = 16*n + r - '0';
else if ('a' <= r && r <= 'f')
n = 16*n + r - 'a' + 10;
else if ('A' <= r && r <= 'F')
n = 16*n + r - 'A' + 10;
else {
if (i == 0)
*rp = 'x';
else *rp = n;
return save;
}
}
} else {
for(i = 0; i < 3; i++) {
save = s;
s += chartorune(&r, s);
if('0' <= r && r <= '7')
n = 8*n + r - '0';
else {
if (i == 0)
{
*rp = r;
return s;
}
*rp = n;
return save;
}
}
if(n > 0377)
sysfatal("character > 0377");
}
*rp = n;
}
return s;
}
long
canon(Pcb *p)
{
Rune r;
if (p->final >= 0) {
if (p->last < p->final)
return ++p->last;
p->final = -1;
}
if (*p->current == '\0')
return -1;
if(*p->current == '-' && p->last >= 0 && p->current[1]){
p->current = getrune(p->current+1, &r);
if (r < p->last)
sysfatal("invalid range specification");
if (r > p->last) {
p->final = r;
return ++p->last;
}
}
p->current = getrune(p->current, &r);
p->last = r;
return p->last;
}
void
Pinit(Pcb *p, char *cp)
{
p->current = p->base = cp;
p->last = p->final = -1;
}
void
Prewind(Pcb *p)
{
p->current = p->base;
p->last = p->final = -1;
}