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118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini comm implementation for busybox
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*
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* Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config COMM
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//config: bool "comm (4.4 kb)"
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//config: default y
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//config: help
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//config: comm is used to compare two files line by line and return
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//config: a three-column output.
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//applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_COMM) += comm.o
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//usage:#define comm_trivial_usage
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//usage: "[-123] FILE1 FILE2"
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//usage:#define comm_full_usage "\n\n"
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//usage: "Compare FILE1 with FILE2\n"
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//usage: "\n -1 Suppress lines unique to FILE1"
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//usage: "\n -2 Suppress lines unique to FILE2"
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//usage: "\n -3 Suppress lines common to both files"
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#include "libbb.h"
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#define COMM_OPT_1 (1 << 0)
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#define COMM_OPT_2 (1 << 1)
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#define COMM_OPT_3 (1 << 2)
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/* writeline outputs the input given, appropriately aligned according to class */
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static void writeline(char *line, int class)
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{
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int flags = option_mask32;
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if (class == 0) {
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if (flags & COMM_OPT_1)
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return;
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} else if (class == 1) {
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if (flags & COMM_OPT_2)
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return;
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if (!(flags & COMM_OPT_1))
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putchar('\t');
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} else /*if (class == 2)*/ {
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if (flags & COMM_OPT_3)
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return;
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if (!(flags & COMM_OPT_1))
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putchar('\t');
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if (!(flags & COMM_OPT_2))
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putchar('\t');
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}
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puts(line);
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}
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int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int comm_main(int argc UNUSED_PARAM, char **argv)
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{
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char *thisline[2];
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FILE *stream[2];
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int i;
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int order;
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getopt32(argv, "^" "123" "\0" "=2");
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argv += optind;
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for (i = 0; i < 2; ++i) {
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stream[i] = xfopen_stdin(argv[i]);
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}
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order = 0;
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thisline[1] = thisline[0] = NULL;
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while (1) {
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if (order <= 0) {
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free(thisline[0]);
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thisline[0] = xmalloc_fgetline(stream[0]);
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}
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if (order >= 0) {
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free(thisline[1]);
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thisline[1] = xmalloc_fgetline(stream[1]);
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}
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i = !thisline[0] + (!thisline[1] << 1);
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if (i)
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break;
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order = strcmp(thisline[0], thisline[1]);
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if (order >= 0)
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writeline(thisline[1], order ? 1 : 2);
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else
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writeline(thisline[0], 0);
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}
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/* EOF at least on one of the streams */
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i &= 1;
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if (thisline[i]) {
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/* stream[i] is not at EOF yet */
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/* we did not print thisline[i] yet */
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char *p = thisline[i];
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writeline(p, i);
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while (1) {
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free(p);
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p = xmalloc_fgetline(stream[i]);
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if (!p)
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break;
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writeline(p, i);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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fclose(stream[0]);
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fclose(stream[1]);
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}
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return EXIT_SUCCESS;
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}
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