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/* vi: set sw=4 ts=4:
*
* 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
*/
#include "toys.h"
#define FLAG_1 1
#define FLAG_2 2
#define FLAG_3 4
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] = strcmp("-", toys.optargs[i]) ? xopen(toys.optargs[i], O_RDONLY) : 0;
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]);
}
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