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/* 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
Read FILE1 and FILE2, which should be ordered, and produce 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 && FLAG(1)) return;
else if (col == 1) {
if (FLAG(2)) return;
if (!FLAG(1)) putchar('\t');
} else if (col == 2) {
if (FLAG(3)) return;
if (!FLAG(1)) putchar('\t');
if (!FLAG(2)) putchar('\t');
}
puts(line);
}
void comm_main(void)
{
FILE *file[2];
char *line[2];
int i = 0;
for (i = 0; i<2; i++) {
file[i] = strcmp(toys.optargs[i], "-")?xfopen(toys.optargs[i], "r"):stdin;
line[i] = xgetline(file[i]);
}
if (toys.optflags == 7) return;
while (line[0] && line[1]) {
int order = strcmp(line[0], line[1]);
if (!order) {
writeline(line[0], 2);
for (i = 0; i < 2; i++) {
free(line[i]);
line[i] = xgetline(file[i]);
}
} else {
i = order>0;
writeline(line[i], i);
free(line[i]);
line[i] = xgetline(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] = xgetline(file[i]);
}
if (CFG_TOYBOX_FREE) fclose(file[0]), fclose(file[1]);
}
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