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/* vi: set sw=4 ts=4: */
/*
* Mini comm implementation for busybox
*
* Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config COMM
//config: bool "comm (4.2 kb)"
//config: default y
//config: help
//config: comm is used to compare two files line by line and return
//config: a three-column output.
//applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_COMM) += comm.o
//usage:#define comm_trivial_usage
//usage: "[-123] FILE1 FILE2"
//usage:#define comm_full_usage "\n\n"
//usage: "Compare FILE1 with FILE2\n"
//usage: "\n -1 Suppress lines unique to FILE1"
//usage: "\n -2 Suppress lines unique to FILE2"
//usage: "\n -3 Suppress lines common to both files"
#include "libbb.h"
#define COMM_OPT_1 (1 << 0)
#define COMM_OPT_2 (1 << 1)
#define COMM_OPT_3 (1 << 2)
/* writeline outputs the input given, appropriately aligned according to class */
static void writeline(char *line, int class)
{
int flags = option_mask32;
if (class == 0) {
if (flags & COMM_OPT_1)
return;
} else if (class == 1) {
if (flags & COMM_OPT_2)
return;
if (!(flags & COMM_OPT_1))
putchar('\t');
} else /*if (class == 2)*/ {
if (flags & COMM_OPT_3)
return;
if (!(flags & COMM_OPT_1))
putchar('\t');
if (!(flags & COMM_OPT_2))
putchar('\t');
}
puts(line);
}
int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int comm_main(int argc UNUSED_PARAM, char **argv)
{
char *thisline[2];
FILE *stream[2];
int i;
int order;
getopt32(argv, "^" "123" "\0" "=2");
argv += optind;
for (i = 0; i < 2; ++i) {
stream[i] = xfopen_stdin(argv[i]);
}
order = 0;
thisline[1] = thisline[0] = NULL;
while (1) {
if (order <= 0) {
free(thisline[0]);
thisline[0] = xmalloc_fgetline(stream[0]);
}
if (order >= 0) {
free(thisline[1]);
thisline[1] = xmalloc_fgetline(stream[1]);
}
i = !thisline[0] + (!thisline[1] << 1);
if (i)
break;
order = strcmp(thisline[0], thisline[1]);
if (order >= 0)
writeline(thisline[1], order ? 1 : 2);
else
writeline(thisline[0], 0);
}
/* EOF at least on one of the streams */
i &= 1;
if (thisline[i]) {
/* stream[i] is not at EOF yet */
/* we did not print thisline[i] yet */
char *p = thisline[i];
writeline(p, i);
while (1) {
free(p);
p = xmalloc_fgetline(stream[i]);
if (!p)
break;
writeline(p, i);
}
}
if (ENABLE_FEATURE_CLEAN_UP) {
fclose(stream[0]);
fclose(stream[1]);
}
return EXIT_SUCCESS;
}
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