예제 #1
0
extern void bb_xprint_and_close_file(FILE *file)
{
    bb_xfflush_stdout();
    /* Note: Do not use STDOUT_FILENO here, as this is a lib routine
     *       and the calling code may have reassigned stdout. */
    if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1) {
        /* bb_copyfd outputs any needed messages, so just die. */
        exit(bb_default_error_retval);
    }
    /* Note: Since we're reading, don't bother checking the return value
     *       of fclose().  The only possible failure is EINTR which
     *       should already have been taken care of. */
    fclose(file);
}
예제 #2
0
int cmp_main(int argc, char **argv)
{
	FILE *fp1, *fp2, *outfile = stdout;
	const char *filename1, *filename2;
	const char *fmt;
	int c1, c2, char_pos, line_pos;
	int opt_flags;
	int exit_val = 0;

	bb_default_error_retval = 2;	/* 1 is returned if files are different. */

	opt_flags = bb_getopt_ulflags(argc, argv, opt_chars);

	if ((opt_flags == 3) || (((unsigned int)(--argc - optind)) > 1)) {
		bb_show_usage();
	}

	fp1 = cmp_xfopen_input(filename1 = *(argv += optind));

	filename2 = "-";
	if (*++argv) {
		filename2 = *argv;
	}
	fp2 = cmp_xfopen_input(filename2);

	if (fp1 == fp2) {			/* Paranioa check... stdin == stdin? */
		/* Note that we don't bother reading stdin.  Neither does gnu wc.
		 * But perhaps we should, so that other apps down the chain don't
		 * get the input.  Consider 'echo hello | (cmp - - && cat -)'.
		 */
		return 0;
	}

	fmt = fmt_differ;
	if (opt_flags == OPT_l) {
		fmt = fmt_l_opt;
	}

	char_pos = 0;
	line_pos = 1;
	do {
		c1 = getc(fp1);
		c2 = getc(fp2);
		++char_pos;
		if (c1 != c2) {			/* Remember -- a read error may have occurred. */
			exit_val = 1;		/* But assume the files are different for now. */
			if (c2 == EOF) {
				/* We know that fp1 isn't at EOF or in an error state.  But to
				 * save space below, things are setup to expect an EOF in fp1
				 * if an EOF occurred.  So, swap things around.
				 */
				fp1 = fp2;
				filename1 = filename2;
				c1 = c2;
			}
			if (c1 == EOF) {
				bb_xferror(fp1, filename1);
				fmt = fmt_eof;	/* Well, no error, so it must really be EOF. */
				outfile = stderr;
				/* There may have been output to stdout (option -l), so
				 * make sure we fflush before writing to stderr. */
				bb_xfflush_stdout();
			}
			if (opt_flags != OPT_s) {
				if (opt_flags == OPT_l) {
					line_pos = c1;	/* line_pos is unused in the -l case. */
				}
				bb_fprintf(outfile, fmt, filename1, filename2, char_pos, line_pos, c2);
				if (opt_flags) {	/* This must be -l since not -s. */
					/* If we encountered and EOF, the while check will catch it. */
					continue;
				}
			}
			break;
		}
		if (c1 == '\n') {
			++line_pos;
		}
	} while (c1 != EOF);

	bb_xferror(fp1, filename1);
	bb_xferror(fp2, filename2);

	bb_fflush_stdout_and_exit(exit_val);
}