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#include "gbos.h"
/* uniq [-c] [file]: collapse runs of identical ADJACENT lines (like uniq(1) -
* it does not sort). -c prefixes each line with how many times it repeated. */
#define MAXLINE 80
static unsigned char lines_eq(const char *a, unsigned char la, const char *b, unsigned char lb) {
unsigned char i;
if (la != lb) return 0;
for (i = 0; i < la; i++)
if (a[i] != b[i]) return 0;
return 1;
}
void main(void) {
char *argv[4];
char cur[MAXLINE], prev[MAXLINE];
unsigned char argc = argv_parse(argv, 4);
unsigned char cnt = hasflag(argv, argc, 'c');
unsigned char clen = 0, plen = 0, have = 0, fd = NOFD, i;
unsigned int reps = 0;
char *fname = 0;
int ch;
for (i = 0; i < argc; i++)
if (argv[i][0] != '-') {
fname = argv[i];
break;
}
if (fname) {
fd = open(fname, O_READ);
if (fd == EISDIR) {
puts("uniq: is a directory");
nl();
sexit(2);
}
if (fd == NOFD) {
puts("uniq: no such file");
nl();
sexit(2);
}
}
for (;;) {
if (fd == NOFD) {
char c = readc();
ch = (c == EOF) ? -1 : c;
} else ch = fgetc(fd);
if (ch == '\r') continue;
if (ch >= 0 && ch != '\n') {
if (clen < MAXLINE) cur[clen++] = (char)ch;
continue;
}
/* EOF with nothing buffered: stop. Falling through would compare an
empty "line" against the last run and flush a phantom blank one -
which showed up as a stray "1" in uniq -c. */
if (ch < 0 && clen == 0) break;
if (have && lines_eq(cur, clen, prev, plen)) reps++;
else {
if (have) { /* flush the run that just ended */
if (cnt) {
putu(reps);
putc(' ');
}
writes(prev, plen);
nl();
}
for (i = 0; i < clen; i++) prev[i] = cur[i];
plen = clen;
have = 1;
reps = 1;
}
clen = 0;
if (ch < 0) break;
}
if (have) {
if (cnt) {
putu(reps);
putc(' ');
}
writes(prev, plen);
nl();
}
if (fd != NOFD) close(fd);
}
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