xref: /src/usr.bin/indent/io.c

/*	$NetBSD: io.c,v 1.27 2021/03/08 22:28:31 rillig Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1985 Sun Microsystems, Inc.
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
#ifndef lint
#if defined(__NetBSD__)
__RCSID("$NetBSD: io.c,v 1.27 2021/03/08 22:28:31 rillig Exp $");
#elif defined(__FreeBSD__)
__FBSDID("$FreeBSD: head/usr.bin/indent/io.c 334927 2018-06-10 16:44:18Z pstef $");
#endif
#endif

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#include "indent.h"

int         comment_open;
static int  paren_target;
static int pad_output(int current, int target);

/*
 * dump_line is the routine that actually effects the printing of the new
 * source. It prints the label section, followed by the code section with
 * the appropriate nesting level, followed by any comments.
 */
void
dump_line(void)
{
    int cur_col, target_col;
    static int  not_first_line;

    if (ps.procname[0]) {
	ps.ind_level = 0;
	ps.procname[0] = 0;
    }
    if (s_code == e_code && s_lab == e_lab && s_com == e_com) {
	if (suppress_blanklines > 0)
	    suppress_blanklines--;
	else {
	    ps.bl_line = true;
	    n_real_blanklines++;
	}
    }
    else if (!inhibit_formatting) {
	suppress_blanklines = 0;
	ps.bl_line = false;
	if (prefix_blankline_requested && not_first_line) {
	    if (opt.swallow_optional_blanklines) {
		if (n_real_blanklines == 1)
		    n_real_blanklines = 0;
	    }
	    else {
		if (n_real_blanklines == 0)
		    n_real_blanklines = 1;
	    }
	}
	while (--n_real_blanklines >= 0)
	    putc('\n', output);
	n_real_blanklines = 0;
	if (ps.ind_level == 0)
	    ps.ind_stmt = 0;	/* this is a class A kludge. dont do
				 * additional statement indentation if we are
				 * at bracket level 0 */

	if (e_lab != s_lab || e_code != s_code)
	    ++code_lines;	/* keep count of lines with code */


	if (e_lab != s_lab) {	/* print lab, if any */
	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    while (e_lab > s_lab && (e_lab[-1] == ' ' || e_lab[-1] == '\t'))
		e_lab--;
	    *e_lab = '\0';
	    cur_col = pad_output(1, compute_label_target());
	    if (s_lab[0] == '#' && (strncmp(s_lab, "#else", 5) == 0
				    || strncmp(s_lab, "#endif", 6) == 0)) {
		char *s = s_lab;
		if (e_lab[-1] == '\n') e_lab--;
		do {
		    putc(*s++, output);
		} while (s < e_lab && 'a' <= *s && *s <= 'z');
		while ((*s == ' ' || *s == '\t') && s < e_lab)
		    s++;
		if (s < e_lab)
		    fprintf(output, s[0]=='/' && s[1]=='*' ? "\t%.*s" : "\t/* %.*s */",
			    (int)(e_lab - s), s);
	    }
	    else fprintf(output, "%.*s", (int)(e_lab - s_lab), s_lab);
	    cur_col = count_spaces(cur_col, s_lab);
	}
	else
	    cur_col = 1;	/* there is no label section */

	ps.pcase = false;

	if (s_code != e_code) {	/* print code section, if any */
	    char *p;

	    if (comment_open) {
		comment_open = 0;
		fprintf(output, ".*/\n");
	    }
	    target_col = compute_code_target();
	    {
		int i;

		for (i = 0; i < ps.p_l_follow; i++)
		    if (ps.paren_indents[i] >= 0)
			ps.paren_indents[i] = -(ps.paren_indents[i] + target_col);
	    }
	    cur_col = pad_output(cur_col, target_col);
	    for (p = s_code; p < e_code; p++)
		if (*p == (char) 0200)
		    fprintf(output, "%d", target_col * 7);
		else
		    putc(*p, output);
	    cur_col = count_spaces(cur_col, s_code);
	}
	if (s_com != e_com) {		/* print comment, if any */
	    int target = ps.com_col;
	    char *com_st = s_com;

	    target += ps.comment_delta;
	    while (*com_st == '\t')	/* consider original indentation in
				     * case this is a box comment */
		com_st++, target += opt.tabsize;
	    while (target <= 0)
		if (*com_st == ' ')
		    target++, com_st++;
		else if (*com_st == '\t') {
		    target = opt.tabsize * (1 + (target - 1) / opt.tabsize) + 1;
		    com_st++;
		}
		else
		    target = 1;
	    if (cur_col > target) {	/* if comment can't fit on this line,
				     * put it on next line */
		putc('\n', output);
		cur_col = 1;
		++ps.out_lines;
	    }
	    while (e_com > com_st && isspace((unsigned char)e_com[-1]))
		e_com--;
	    (void)pad_output(cur_col, target);
	    fwrite(com_st, e_com - com_st, 1, output);
	    ps.comment_delta = ps.n_comment_delta;
	    ++ps.com_lines;	/* count lines with comments */
	}
	if (ps.use_ff)
	    putc('\014', output);
	else
	    putc('\n', output);
	++ps.out_lines;
	if (ps.just_saw_decl == 1 && opt.blanklines_after_declarations) {
	    prefix_blankline_requested = 1;
	    ps.just_saw_decl = 0;
	}
	else
	    prefix_blankline_requested = postfix_blankline_requested;
	postfix_blankline_requested = 0;
    }

    /* keep blank lines after '//' comments */
    if (e_com - s_com > 1 && s_com[1] == '/')
	fprintf(output, "%.*s", (int)(e_token - s_token), s_token);

    ps.decl_on_line = ps.in_decl;	/* if we are in the middle of a
					 * declaration, remember that fact for
					 * proper comment indentation */
    ps.ind_stmt = ps.in_stmt & ~ps.in_decl;	/* next line should be
						 * indented if we have not
						 * completed this stmt and if
						 * we are not in the middle of
						 * a declaration */
    ps.use_ff = false;
    ps.dumped_decl_indent = 0;
    *(e_lab = s_lab) = '\0';	/* reset buffers */
    *(e_code = s_code) = '\0';
    *(e_com = s_com = combuf + 1) = '\0';
    ps.ind_level = ps.i_l_follow;
    ps.paren_level = ps.p_l_follow;
    if (ps.paren_level > 0)
	paren_target = -ps.paren_indents[ps.paren_level - 1];
    not_first_line = 1;
}

int
compute_code_target(void)
{
    int target_col = opt.ind_size * ps.ind_level + 1;

    if (ps.paren_level)
	if (!opt.lineup_to_parens)
	    target_col += opt.continuation_indent *
		(2 * opt.continuation_indent == opt.ind_size ? 1 : ps.paren_level);
	else if (opt.lineup_to_parens_always)
	    target_col = paren_target;
	else {
	    int w;
	    int t = paren_target;

	    if ((w = count_spaces(t, s_code) - opt.max_col) > 0
		    && count_spaces(target_col, s_code) <= opt.max_col) {
		t -= w + 1;
		if (t > target_col)
		    target_col = t;
	    }
	    else
		target_col = t;
	}
    else if (ps.ind_stmt)
	target_col += opt.continuation_indent;
    return target_col;
}

int
compute_label_target(void)
{
    return
	ps.pcase ? (int) (case_ind * opt.ind_size) + 1
	: *s_lab == '#' ? 1
	: opt.ind_size * (ps.ind_level - label_offset) + 1;
}


/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 *
 * All rights reserved
 *
 *
 * NAME: fill_buffer
 *
 * FUNCTION: Reads one block of input into input_buffer
 *
 * HISTORY: initial coding	November 1976	D A Willcox of CAC 1/7/77 A
 * Willcox of CAC	Added check for switch back to partly full input
 * buffer from temporary buffer
 *
 */
void
fill_buffer(void)
{				/* this routine reads stuff from the input */
    char *p;
    int i;
    FILE *f = input;

    if (bp_save != NULL) {	/* there is a partly filled input buffer left */
	buf_ptr = bp_save;	/* do not read anything, just switch buffers */
	buf_end = be_save;
	bp_save = be_save = NULL;
	if (buf_ptr < buf_end)
	    return;		/* only return if there is really something in
				 * this buffer */
    }
    for (p = in_buffer;;) {
	if (p >= in_buffer_limit) {
	    int size = (in_buffer_limit - in_buffer) * 2 + 10;
	    int offset = p - in_buffer;
	    in_buffer = realloc(in_buffer, size);
	    if (in_buffer == NULL)
		errx(1, "input line too long");
	    p = in_buffer + offset;
	    in_buffer_limit = in_buffer + size - 2;
	}
	if ((i = getc(f)) == EOF) {
		*p++ = ' ';
		*p++ = '\n';
		had_eof = true;
		break;
	}
	if (i != '\0')
	    *p++ = i;
	if (i == '\n')
		break;
    }
    buf_ptr = in_buffer;
    buf_end = p;
    if (p - in_buffer > 2 && p[-2] == '/' && p[-3] == '*') {
	if (in_buffer[3] == 'I' && strncmp(in_buffer, "/**INDENT**", 11) == 0)
	    fill_buffer();	/* flush indent error message */
	else {
	    int         com = 0;

	    p = in_buffer;
	    while (*p == ' ' || *p == '\t')
		p++;
	    if (*p == '/' && p[1] == '*') {
		p += 2;
		while (*p == ' ' || *p == '\t')
		    p++;
		if (p[0] == 'I' && p[1] == 'N' && p[2] == 'D' && p[3] == 'E'
			&& p[4] == 'N' && p[5] == 'T') {
		    p += 6;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (*p == '*')
			com = 1;
		    else if (*p == 'O') {
			if (*++p == 'N')
			    p++, com = 1;
			else if (*p == 'F' && *++p == 'F')
			    p++, com = 2;
		    }
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (p[0] == '*' && p[1] == '/' && p[2] == '\n' && com) {
			if (s_com != e_com || s_lab != e_lab || s_code != e_code)
			    dump_line();
			if (!(inhibit_formatting = com - 1)) {
			    n_real_blanklines = 0;
			    postfix_blankline_requested = 0;
			    prefix_blankline_requested = 0;
			    suppress_blanklines = 1;
			}
		    }
		}
	    }
	}
    }
    if (inhibit_formatting) {
	p = in_buffer;
	do {
	    putc(*p, output);
	} while (*p++ != '\n');
    }
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 *
 * All rights reserved
 *
 *
 * NAME: pad_output
 *
 * FUNCTION: Writes tabs and spaces to move the current column up to the desired
 * position.
 *
 * ALGORITHM: Put tabs and/or blanks into pobuf, then write pobuf.
 *
 * PARAMETERS: current		integer		The current column target
 * nteger		The desired column
 *
 * RETURNS: Integer value of the new column.  (If current >= target, no action is
 * taken, and current is returned.
 *
 * GLOBALS: None
 *
 * CALLS: write (sys)
 *
 * CALLED BY: dump_line
 *
 * HISTORY: initial coding	November 1976	D A Willcox of CAC
 *
 */
static int
pad_output(int current, int target)
			        /* writes tabs and blanks (if necessary) to
				 * get the current output position up to the
				 * target column */
    /* current: the current column value */
    /* target: position we want it at */
{
    int curr;			/* internal column pointer */

    if (current >= target)
	return current;		/* line is already long enough */
    curr = current;
    if (opt.use_tabs) {
	int tcur;

	while ((tcur = opt.tabsize * (1 + (curr - 1) / opt.tabsize) + 1) <= target) {
	    putc('\t', output);
	    curr = tcur;
	}
    }
    while (curr++ < target)
	putc(' ', output);	/* pad with final blanks */

    return target;
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 *
 * All rights reserved
 *
 *
 * NAME: count_spaces
 *
 * FUNCTION: Find out where printing of a given string will leave the current
 * character position on output.
 *
 * ALGORITHM: Run thru input string and add appropriate values to current
 * position.
 *
 * RETURNS: Integer value of position after printing "buffer" starting in column
 * "current".
 *
 * HISTORY: initial coding	November 1976	D A Willcox of CAC
 *
 */
int
count_spaces_until(int cur, char *buffer, char *end)
/*
 * this routine figures out where the character position will be after
 * printing the text in buffer starting at column "current"
 */
{
    char *buf;		/* used to look thru buffer */

    for (buf = buffer; *buf != '\0' && buf != end; ++buf) {
	switch (*buf) {

	case '\n':
	case 014:		/* form feed */
	    cur = 1;
	    break;

	case '\t':
	    cur = opt.tabsize * (1 + (cur - 1) / opt.tabsize) + 1;
	    break;

	case 010:		/* backspace */
	    --cur;
	    break;

	default:
	    ++cur;
	    break;
	}			/* end of switch */
    }				/* end of for loop */
    return cur;
}

int
count_spaces(int cur, char *buffer)
{
    return count_spaces_until(cur, buffer, NULL);
}

void
diag(int level, const char *msg, ...)
{
    va_list ap;
    const char *s, *e;

    if (level)
	found_err = 1;

    if (output == stdout) {
	s = "/**INDENT** ";
	e = " */";
    } else {
	s = e = "";
    }

    va_start(ap, msg);
    fprintf(stderr, "%s%s@%d: ", s, level == 0 ? "Warning" : "Error", line_no);
    vfprintf(stderr, msg, ap);
    fprintf(stderr, "%s\n", e);
    va_end(ap);
}