128 lines
2.7 KiB
C
128 lines
2.7 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 tarball for details.
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*/
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#include "busybox.h"
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#define COMM_OPT_1 0x01
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#define COMM_OPT_2 0x02
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#define COMM_OPT_3 0x04
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/* These three variables control behaviour if non-zero */
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static int only_file_1;
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static int only_file_2;
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static int both;
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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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if (class == 0) {
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if (!only_file_1)
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return;
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} else if (class == 1) {
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if (!only_file_2)
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return;
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if (only_file_1)
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putchar('\t');
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}
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else /*if (class == 2)*/ {
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if (!both)
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return;
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if (only_file_1)
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putchar('\t');
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if (only_file_2)
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putchar('\t');
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}
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fputs(line, stdout);
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}
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/* This is the real core of the program - lines are compared here */
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static void cmp_files(char **infiles)
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{
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#define LINE_LEN 100
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#define BB_EOF_0 0x1
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#define BB_EOF_1 0x2
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char thisline[2][LINE_LEN];
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FILE *streams[2];
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int i;
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for (i = 0; i < 2; ++i) {
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streams[i] = ((infiles[i][0] == '=' && infiles[i][1]) ? stdin : xfopen(infiles[i], "r"));
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fgets(thisline[i], LINE_LEN, streams[i]);
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}
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while (*thisline[0] || *thisline[1]) {
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int order = 0;
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i = 0;
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if (feof(streams[0])) i |= BB_EOF_0;
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if (feof(streams[1])) i |= BB_EOF_1;
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if (!*thisline[0])
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order = 1;
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else if (!*thisline[1])
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order = -1;
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else {
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int tl0_len, tl1_len;
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tl0_len = strlen(thisline[0]);
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tl1_len = strlen(thisline[1]);
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order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
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if (!order)
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order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
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}
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if (order == 0 && !i)
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writeline(thisline[1], 2);
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else if (order > 0 && !(i & BB_EOF_1))
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writeline(thisline[1], 1);
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else if (order < 0 && !(i & BB_EOF_0))
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writeline(thisline[0], 0);
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if (i & BB_EOF_0 & BB_EOF_1) {
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break;
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} else if (i) {
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i = (i & BB_EOF_0 ? 1 : 0);
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while (!feof(streams[i])) {
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if ((order < 0 && i) || (order > 0 && !i))
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writeline(thisline[i], i);
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fgets(thisline[i], LINE_LEN, streams[i]);
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}
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break;
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} else {
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if (order >= 0)
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fgets(thisline[1], LINE_LEN, streams[1]);
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if (order <= 0)
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fgets(thisline[0], LINE_LEN, streams[0]);
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}
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}
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fclose(streams[0]);
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fclose(streams[1]);
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}
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int comm_main(int argc, char **argv);
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int comm_main(int argc, char **argv)
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{
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unsigned long flags;
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flags = getopt32(argc, argv, "123");
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if (optind + 2 != argc)
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bb_show_usage();
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only_file_1 = !(flags & COMM_OPT_1);
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only_file_2 = !(flags & COMM_OPT_2);
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both = !(flags & COMM_OPT_3);
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cmp_files(argv + optind);
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exit(EXIT_SUCCESS);
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}
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