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/*
* Deal with duplicated lines in a file
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ctype.h>
#define SIZE 8000
int fields = 0;
int letters = 0;
int linec = 0;
char mode;
int uniq;
char *b1, *b2;
long bsize;
Biobuf fin;
Biobuf fout;
int gline(char *buf);
void pline(char *buf);
int equal(char *b1, char *b2);
char* skip(char *s);
void
main(int argc, char *argv[])
{
int f;
bsize = SIZE;
b1 = malloc(bsize);
b2 = malloc(bsize);
f = 0;
while(argc > 1) {
if(*argv[1] == '-') {
if(isdigit((uchar)argv[1][1]))
fields = atoi(&argv[1][1]);
else
mode = argv[1][1];
argc--;
argv++;
continue;
}
if(*argv[1] == '+') {
letters = atoi(&argv[1][1]);
argc--;
argv++;
continue;
}
f = open(argv[1], 0);
if(f < 0) {
fprint(2, "cannot open %s\n", argv[1]);
exits("open");
}
break;
}
if(argc > 2) {
fprint(2, "unexpected argument %s\n", argv[2]);
exits("arg");
}
Binit(&fin, f, OREAD);
Binit(&fout, 1, OWRITE);
if(gline(b1))
exits(0);
for(;;) {
linec++;
if(gline(b2)) {
pline(b1);
exits(0);
}
if(!equal(b1, b2)) {
pline(b1);
linec = 0;
do {
linec++;
if(gline(b1)) {
pline(b2);
exits(0);
}
} while(equal(b2, b1));
pline(b2);
linec = 0;
}
}
}
int
gline(char *buf)
{
char *p;
p = Brdline(&fin, '\n');
if(p == 0)
return 1;
if(fin.rdline >= bsize-1) {
fprint(2, "line too long\n");
exits("too long");
}
memmove(buf, p, fin.rdline);
buf[fin.rdline-1] = 0;
return 0;
}
void
pline(char *buf)
{
switch(mode) {
case 'u':
if(uniq) {
uniq = 0;
return;
}
break;
case 'd':
if(uniq)
break;
return;
case 'c':
Bprint(&fout, "%4d ", linec);
}
uniq = 0;
Bprint(&fout, "%s\n", buf);
}
int
equal(char *b1, char *b2)
{
char c;
if(fields || letters) {
b1 = skip(b1);
b2 = skip(b2);
}
for(;;) {
c = *b1++;
if(c != *b2++) {
if(c == 0 && mode == 's')
return 1;
return 0;
}
if(c == 0) {
uniq++;
return 1;
}
}
}
char*
skip(char *s)
{
int nf, nl;
nf = nl = 0;
while(nf++ < fields) {
while(*s == ' ' || *s == '\t')
s++;
while(!(*s == ' ' || *s == '\t' || *s == 0) )
s++;
}
while(nl++ < letters && *s != 0)
s++;
return s;
}
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