/*-
 * 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.
 */

#include <sys/cdefs.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "indent_globs.h"
#include "indent.h"

/* Globals */
int     found_err;
int     n_real_blanklines;
int     prefix_blankline_requested, postfix_blankline_requested;
int     code_lines;
int     had_eof;
int     inhibit_formatting;
int     suppress_blanklines;

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

void
dump_line(void)
{                               /* 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 */
    int cur_col,
                target_col = 1;
    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;
    }
    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
diag4(int level, const char *msg, int a, int b)
{
    if (level)
        found_err = 1;
    if (output == stdout) {
        fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stdout, msg, a, b);
        fprintf(stdout, " */\n");
    }
    else {
        fprintf(stderr, "%s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stderr, msg, a, b);
        fprintf(stderr, "\n");
    }
}

void
diag3(int level, const char *msg, int a)
{
    if (level)
        found_err = 1;
    if (output == stdout) {
        fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stdout, msg, a);
        fprintf(stdout, " */\n");
    }
    else {
        fprintf(stderr, "%s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stderr, msg, a);
        fprintf(stderr, "\n");
    }
}

void
diag2(int level, const char *msg)
{
    if (level)
        found_err = 1;
    if (output == stdout) {
        fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stdout, "%s", msg);
        fprintf(stdout, " */\n");
    }
    else {
        fprintf(stderr, "%s@%d: ", level == 0 ? "Warning" : "Error", line_no);
        fprintf(stderr, "%s", msg);
        fprintf(stderr, "\n");
    }
}