blob: 33c056d3ee5848fa7a36ba4d8b89e4ed4af30c21 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* comm.c - select or reject lines common to two files
*
* Copyright 2012 Ilya Kuzmich <ikv@safe-mail.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/comm.html
// <# and ># take single digit, so 321 define flags
USE_COMM(NEWTOY(comm, "<2>2321", TOYFLAG_USR|TOYFLAG_BIN))
config COMM
bool "comm"
default y
help
usage: comm [-123] FILE1 FILE2
Reads FILE1 and FILE2, which should be ordered, and produces three text
columns as output: lines only in FILE1; lines only in FILE2; and lines
in both files. Filename "-" is a synonym for stdin.
-1 Suppress the output column of lines unique to FILE1
-2 Suppress the output column of lines unique to FILE2
-3 Suppress the output column of lines duplicated in FILE1 and FILE2
*/
#define FOR_comm
#include "toys.h"
static void writeline(const char *line, int col)
{
if (col == 0 && toys.optflags & FLAG_1) return;
else if (col == 1) {
if (toys.optflags & FLAG_2) return;
if (!(toys.optflags & FLAG_1)) putchar('\t');
} else if (col == 2) {
if (toys.optflags & FLAG_3) return;
if (!(toys.optflags & FLAG_1)) putchar('\t');
if (!(toys.optflags & FLAG_2)) putchar('\t');
}
puts(line);
}
void comm_main(void)
{
int file[2];
char *line[2];
int i;
if (toys.optflags == 7) return;
for (i = 0; i < 2; i++) {
file[i] = xopenro(toys.optargs[i]);
line[i] = get_line(file[i]);
}
while (line[0] && line[1]) {
int order = strcmp(line[0], line[1]);
if (order == 0) {
writeline(line[0], 2);
for (i = 0; i < 2; i++) {
free(line[i]);
line[i] = get_line(file[i]);
}
} else {
i = order < 0 ? 0 : 1;
writeline(line[i], i);
free(line[i]);
line[i] = get_line(file[i]);
}
}
/* print rest of the longer file */
for (i = line[0] ? 0 : 1; line[i];) {
writeline(line[i], i);
free(line[i]);
line[i] = get_line(file[i]);
}
if (CFG_TOYBOX_FREE) for (i = 0; i < 2; i++) xclose(file[i]);
}
|
