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/* $NetBSD: indent.c,v 1.142 2021/10/20 05:14:21 rillig Exp $ */
/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1985 Sun Microsystems, Inc.
* Copyright (c) 1976 Board of Trustees of the University of Illinois.
* Copyright (c) 1980, 1993
* The Regents of the University of California. 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
static char sccsid[] = "@(#)indent.c 5.17 (Berkeley) 6/7/93";
#endif
#include <sys/cdefs.h>
#if defined(__NetBSD__)
__RCSID("$NetBSD: indent.c,v 1.142 2021/10/20 05:14:21 rillig Exp $");
#elif defined(__FreeBSD__)
__FBSDID("$FreeBSD: head/usr.bin/indent/indent.c 340138 2018-11-04 19:24:49Z oshogbo $");
#endif
#include <sys/param.h>
#if HAVE_CAPSICUM
#include <sys/capsicum.h>
#include <capsicum_helpers.h>
#endif
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "indent.h"
struct options opt = {
.brace_same_line = true,
.comment_delimiter_on_blankline = true,
.cuddle_else = true,
.comment_column = 33,
.decl_indent = 16,
.else_if = true,
.function_brace_split = true,
.format_col1_comments = true,
.format_block_comments = true,
.indent_parameters = true,
.indent_size = 8,
.local_decl_indent = -1,
.lineup_to_parens = true,
.procnames_start_line = true,
.star_comment_cont = true,
.tabsize = 8,
.max_line_length = 78,
.use_tabs = true,
};
struct parser_state ps;
struct buffer lab;
struct buffer code;
struct buffer com;
struct buffer token;
struct buffer inp;
char sc_buf[sc_size];
char *save_com;
static char *sc_end; /* pointer into save_com buffer */
char *saved_inp_s;
char *saved_inp_e;
bool found_err;
int blank_lines_to_output;
bool blank_line_before;
bool blank_line_after;
bool break_comma;
float case_ind;
bool had_eof;
int line_no;
bool inhibit_formatting;
static int ifdef_level;
static struct parser_state state_stack[5];
FILE *input;
FILE *output;
static const char *in_name = "Standard Input";
static const char *out_name = "Standard Output";
static const char *backup_suffix = ".BAK";
static char bakfile[MAXPATHLEN] = "";
#if HAVE_CAPSICUM
static void
init_capsicum(void)
{
cap_rights_t rights;
/* Restrict input/output descriptors and enter Capsicum sandbox. */
cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE);
if (caph_rights_limit(fileno(output), &rights) < 0)
err(EXIT_FAILURE, "unable to limit rights for %s", out_name);
cap_rights_init(&rights, CAP_FSTAT, CAP_READ);
if (caph_rights_limit(fileno(input), &rights) < 0)
err(EXIT_FAILURE, "unable to limit rights for %s", in_name);
if (caph_enter() < 0)
err(EXIT_FAILURE, "unable to enter capability mode");
}
#endif
static void
search_brace_newline(bool *force_nl)
{
if (sc_end == NULL) {
save_com = sc_buf;
save_com[0] = save_com[1] = ' ';
sc_end = &save_com[2];
}
*sc_end++ = '\n';
/*
* We may have inherited a force_nl == true from the previous token (like
* a semicolon). But once we know that a newline has been scanned in this
* loop, force_nl should be false.
*
* However, the force_nl == true must be preserved if newline is never
* scanned in this loop, so this assignment cannot be done earlier.
*/
*force_nl = false;
}
static void
search_brace_comment(bool *comment_buffered)
{
if (sc_end == NULL) {
/*
* Copy everything from the start of the line, because
* process_comment() will use that to calculate original indentation
* of a boxed comment.
*/
memcpy(sc_buf, inp.buf, (size_t)(inp.s - inp.buf) - 4);
save_com = sc_buf + (inp.s - inp.buf - 4);
save_com[0] = save_com[1] = ' ';
sc_end = &save_com[2];
}
*comment_buffered = true;
*sc_end++ = '/'; /* copy in start of comment */
*sc_end++ = '*';
for (;;) { /* loop until the end of the comment */
*sc_end++ = inbuf_next();
if (sc_end[-1] == '*' && *inp.s == '/')
break; /* we are at end of comment */
if (sc_end >= &save_com[sc_size]) { /* check for temp buffer
* overflow */
diag(1, "Internal buffer overflow - Move big comment from right after if, while, or whatever");
fflush(output);
exit(1);
}
}
*sc_end++ = '/'; /* add ending slash */
inbuf_skip(); /* get past / in buffer */
}
static bool
search_brace_lbrace(void)
{
/*
* Put KNF-style lbraces before the buffered up tokens and jump out of
* this loop in order to avoid copying the token again.
*/
if (sc_end != NULL && opt.brace_same_line) {
save_com[0] = '{';
/*
* Originally the lbrace may have been alone on its own line, but it
* will be moved into "the else's line", so if there was a newline
* resulting from the "{" before, it must be scanned now and ignored.
*/
while (isspace((unsigned char)*inp.s)) {
inbuf_skip();
if (*inp.s == '\n')
break;
}
return true;
}
return false;
}
static bool
search_brace_other(token_type ttype, bool *force_nl,
bool comment_buffered, bool last_else)
{
bool remove_newlines;
remove_newlines =
/* "} else" */
(ttype == keyword_do_else && *token.s == 'e' &&
code.e != code.s && code.e[-1] == '}')
/* "else if" */
|| (ttype == keyword_for_if_while &&
*token.s == 'i' && last_else && opt.else_if);
if (remove_newlines)
*force_nl = false;
if (sc_end == NULL) { /* ignore buffering if comment wasn't saved
* up */
ps.search_brace = false;
return false;
}
while (sc_end > save_com && isblank((unsigned char)sc_end[-1]))
sc_end--;
if (opt.swallow_optional_blanklines ||
(!comment_buffered && remove_newlines)) {
*force_nl = !remove_newlines;
while (sc_end > save_com && sc_end[-1] == '\n') {
sc_end--;
}
}
if (*force_nl) { /* if we should insert a nl here, put it into
* the buffer */
*force_nl = false;
--line_no; /* this will be re-increased when the newline
* is read from the buffer */
*sc_end++ = '\n';
*sc_end++ = ' ';
if (opt.verbose) /* warn if the line was not already broken */
diag(0, "Line broken");
}
/* XXX: buffer overflow? This is essentially a strcpy. */
for (const char *t_ptr = token.s; *t_ptr != '\0'; ++t_ptr)
*sc_end++ = *t_ptr;
return true;
}
static void
switch_buffer(void)
{
ps.search_brace = false; /* stop looking for start of stmt */
saved_inp_s = inp.s; /* save current input buffer */
saved_inp_e = inp.e;
inp.s = save_com; /* fix so that subsequent calls to lexi will
* take tokens out of save_com */
*sc_end++ = ' '; /* add trailing blank, just in case */
inp.e = sc_end;
sc_end = NULL;
debug_println("switched inp.s to save_com");
}
static void
search_brace_lookahead(token_type *ttype)
{
if (*ttype == end_of_file)
return;
/*
* The only intended purpose of calling lexi() below is to categorize
* the next token in order to decide whether to continue buffering
* forthcoming tokens. Once the buffering is over, lexi() will be
* called again elsewhere on all of the tokens - this time for normal
* processing.
*
* Calling it for this purpose is a bug, because lexi() also changes
* the parser state and discards leading whitespace, which is needed
* mostly for comment-related considerations.
*
* Work around the former problem by giving lexi() a copy of the
* current parser state and discard it if the call turned out to be
* just a lookahead.
*
* Work around the latter problem by copying all whitespace characters
* into the buffer so that the later lexi() call will read them.
*/
if (sc_end != NULL) {
while (is_hspace(*inp.s)) {
*sc_end++ = *inp.s++;
if (sc_end >= &save_com[sc_size])
errx(1, "input too long");
}
if (inp.s >= inp.e)
inbuf_read_line();
}
struct parser_state transient_state;
transient_state = ps;
*ttype = lexi(&transient_state); /* read another token */
if (*ttype != newline && *ttype != form_feed &&
*ttype != comment && !transient_state.search_brace) {
ps = transient_state;
}
}
static void
search_brace(token_type *ttype, bool *force_nl,
bool *comment_buffered, bool *last_else)
{
while (ps.search_brace) {
switch (*ttype) {
case newline:
search_brace_newline(force_nl);
break;
case form_feed:
break;
case comment:
search_brace_comment(comment_buffered);
break;
case lbrace:
if (search_brace_lbrace())
goto switch_buffer;
/* FALLTHROUGH */
default: /* it is the start of a normal statement */
if (!search_brace_other(*ttype, force_nl,
*comment_buffered, *last_else))
return;
switch_buffer:
switch_buffer();
}
search_brace_lookahead(ttype);
}
*last_else = false;
}
static void
buf_init(struct buffer *buf)
{
size_t size = 200;
buf->buf = xmalloc(size);
buf->buf[0] = ' '; /* allow accessing buf->e[-1] */
buf->buf[1] = '\0';
buf->s = buf->buf + 1;
buf->e = buf->s;
buf->l = buf->buf + size - 5; /* safety margin */
}
static size_t
buf_len(const struct buffer *buf)
{
return (size_t)(buf->e - buf->s);
}
void
buf_expand(struct buffer *buf, size_t desired_size)
{
size_t nsize = (size_t)(buf->l - buf->s) + 400 + desired_size;
size_t len = buf_len(buf);
buf->buf = xrealloc(buf->buf, nsize);
buf->e = buf->buf + len + 1;
buf->l = buf->buf + nsize - 5;
buf->s = buf->buf + 1;
}
static void
buf_reserve(struct buffer *buf, size_t n)
{
if (buf->e + n >= buf->l)
buf_expand(buf, n);
}
static void
buf_add_char(struct buffer *buf, char ch)
{
buf_reserve(buf, 1);
*buf->e++ = ch;
}
static void
buf_add_buf(struct buffer *buf, const struct buffer *add)
{
size_t len = buf_len(add);
buf_reserve(buf, len);
memcpy(buf->e, add->s, len);
buf->e += len;
}
static void
buf_terminate(struct buffer *buf)
{
buf_reserve(buf, 1);
*buf->e = '\0';
}
static void
buf_reset(struct buffer *buf)
{
buf->e = buf->s;
}
static void
main_init_globals(void)
{
found_err = false;
ps.p_stack[0] = stmt;
ps.last_nl = true;
ps.last_token = semicolon;
buf_init(&com);
buf_init(&lab);
buf_init(&code);
buf_init(&token);
opt.else_if = true; /* XXX: redundant? */
inp.buf = xmalloc(10);
inp.l = inp.buf + 8;
inp.s = inp.e = inp.buf;
line_no = 1;
had_eof = ps.in_decl = ps.decl_on_line = break_comma = false;
ps.init_or_struct = false;
ps.want_blank = ps.in_stmt = ps.ind_stmt = false;
ps.is_case_label = false;
sc_end = NULL;
saved_inp_s = NULL;
saved_inp_e = NULL;
output = NULL;
const char *suffix = getenv("SIMPLE_BACKUP_SUFFIX");
if (suffix != NULL)
backup_suffix = suffix;
}
/*
* Copy the input file to the backup file, then make the backup file the input
* and the original input file the output.
*/
static void
bakcopy(void)
{
ssize_t n;
int bak_fd;
char buff[8 * 1024];
const char *last_slash = strrchr(in_name, '/');
snprintf(bakfile, sizeof(bakfile), "%s%s",
last_slash != NULL ? last_slash + 1 : in_name, backup_suffix);
/* copy in_name to backup file */
bak_fd = creat(bakfile, 0600);
if (bak_fd < 0)
err(1, "%s", bakfile);
while ((n = read(fileno(input), buff, sizeof(buff))) > 0)
if (write(bak_fd, buff, (size_t)n) != n)
err(1, "%s", bakfile);
if (n < 0)
err(1, "%s", in_name);
close(bak_fd);
(void)fclose(input);
/* re-open backup file as the input file */
input = fopen(bakfile, "r");
if (input == NULL)
err(1, "%s", bakfile);
/* now the original input file will be the output */
output = fopen(in_name, "w");
if (output == NULL) {
unlink(bakfile);
err(1, "%s", in_name);
}
}
static void
main_parse_command_line(int argc, char **argv)
{
int i;
const char *profile_name = NULL;
for (i = 1; i < argc; ++i)
if (strcmp(argv[i], "-npro") == 0)
break;
else if (argv[i][0] == '-' && argv[i][1] == 'P' && argv[i][2] != '\0')
profile_name = argv[i] + 2; /* non-empty -P (set profile) */
if (i >= argc)
load_profiles(profile_name);
for (i = 1; i < argc; ++i) {
if (argv[i][0] == '-') {
set_option(argv[i], "Command line");
} else if (input == NULL) {
in_name = argv[i];
input = fopen(in_name, "r");
if (input == NULL)
err(1, "%s", in_name);
} else if (output == NULL) {
out_name = argv[i];
if (strcmp(in_name, out_name) == 0)
errx(1, "input and output files must be different");
output = fopen(out_name, "w");
if (output == NULL)
err(1, "%s", out_name);
} else
errx(1, "unknown parameter: %s", argv[i]);
}
if (input == NULL)
input = stdin;
if (output == NULL) {
if (input == stdin)
output = stdout;
else {
out_name = in_name;
bakcopy();
}
}
if (opt.comment_column <= 1)
opt.comment_column = 2; /* don't put normal comments before column 2 */
if (opt.block_comment_max_line_length <= 0)
opt.block_comment_max_line_length = opt.max_line_length;
if (opt.local_decl_indent < 0) /* if not specified by user, set this */
opt.local_decl_indent = opt.decl_indent;
if (opt.decl_comment_column <= 0) /* if not specified by user, set this */
opt.decl_comment_column = opt.ljust_decl
? (opt.comment_column <= 10 ? 2 : opt.comment_column - 8)
: opt.comment_column;
if (opt.continuation_indent == 0)
opt.continuation_indent = opt.indent_size;
}
static void
main_prepare_parsing(void)
{
inbuf_read_line();
parse(semicolon);
int ind = 0;
for (const char *p = inp.s;; p++) {
if (*p == ' ')
ind++;
else if (*p == '\t')
ind = next_tab(ind);
else
break;
}
if (ind >= opt.indent_size)
ps.ind_level = ps.ind_level_follow = ind / opt.indent_size;
}
static void
indent_declaration(int cur_decl_ind, bool tabs_to_var)
{
int ind = (int)buf_len(&code);
char *orig_code_e = code.e;
/*
* get the tab math right for indentations that are not multiples of
* tabsize
*/
if ((ps.ind_level * opt.indent_size) % opt.tabsize != 0) {
ind += (ps.ind_level * opt.indent_size) % opt.tabsize;
cur_decl_ind += (ps.ind_level * opt.indent_size) % opt.tabsize;
}
if (tabs_to_var) {
for (int next; (next = next_tab(ind)) <= cur_decl_ind; ind = next)
buf_add_char(&code, '\t');
}
for (; ind < cur_decl_ind; ind++)
buf_add_char(&code, ' ');
if (code.e == orig_code_e && ps.want_blank) {
*code.e++ = ' ';
ps.want_blank = false;
}
}
static void __attribute__((__noreturn__))
process_end_of_file(void)
{
if (lab.s != lab.e || code.s != code.e || com.s != com.e)
dump_line();
if (ps.tos > 1) /* check for balanced braces */
diag(1, "Stuff missing from end of file");
if (opt.verbose) {
printf("There were %d output lines and %d comments\n",
ps.stats.lines, ps.stats.comments);
printf("(Lines with comments)/(Lines with code): %6.3f\n",
(1.0 * ps.stats.comment_lines) / ps.stats.code_lines);
}
fflush(output);
exit(found_err ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void
process_comment_in_code(token_type ttype, bool *force_nl)
{
if (*force_nl &&
ttype != semicolon &&
(ttype != lbrace || !opt.brace_same_line)) {
/* we should force a broken line here */
if (opt.verbose)
diag(0, "Line broken");
dump_line();
ps.want_blank = false; /* don't insert blank at line start */
*force_nl = false;
}
/* add an extra level of indentation; turned off again by a ';' or '}' */
ps.in_stmt = true;
if (com.s != com.e) { /* a comment embedded in a line */
buf_add_char(&code, ' ');
buf_add_buf(&code, &com);
buf_add_char(&code, ' ');
buf_terminate(&code);
buf_reset(&com);
ps.want_blank = false;
}
}
static void
process_form_feed(void)
{
ps.use_ff = true;
dump_line();
ps.want_blank = false;
}
static void
process_newline(void)
{
if (ps.last_token == comma && ps.p_l_follow == 0 && !ps.block_init &&
!opt.break_after_comma && break_comma &&
com.s == com.e)
goto stay_in_line;
dump_line();
ps.want_blank = false;
stay_in_line:
++line_no;
}
static bool
want_blank_before_lparen(void)
{
if (!ps.want_blank)
return false;
if (ps.last_token == rparen_or_rbracket)
return false;
if (ps.last_token != ident && ps.last_token != funcname)
return true;
if (opt.proc_calls_space)
return true;
if (ps.keyword == kw_sizeof)
return opt.blank_after_sizeof;
return ps.keyword != kw_0 && ps.keyword != kw_offsetof;
}
static void
process_lparen_or_lbracket(int decl_ind, bool tabs_to_var, bool sp_sw)
{
if (++ps.p_l_follow == nitems(ps.paren_indents)) {
diag(0, "Reached internal limit of %zu unclosed parens",
nitems(ps.paren_indents));
ps.p_l_follow--;
}
if (token.s[0] == '(' && ps.in_decl
&& !ps.block_init && !ps.dumped_decl_indent &&
ps.procname[0] == '\0' && ps.paren_level == 0) {
/* function pointer declarations */
indent_declaration(decl_ind, tabs_to_var);
ps.dumped_decl_indent = true;
} else if (want_blank_before_lparen())
*code.e++ = ' ';
ps.want_blank = false;
*code.e++ = token.s[0];
ps.paren_indents[ps.p_l_follow - 1] =
(short)indentation_after_range(0, code.s, code.e);
debug_println("paren_indents[%d] is now %d",
ps.p_l_follow - 1, ps.paren_indents[ps.p_l_follow - 1]);
if (sp_sw && ps.p_l_follow == 1 && opt.extra_expr_indent
&& ps.paren_indents[0] < 2 * opt.indent_size) {
ps.paren_indents[0] = (short)(2 * opt.indent_size);
debug_println("paren_indents[0] is now %d", ps.paren_indents[0]);
}
if (ps.init_or_struct && *token.s == '(' && ps.tos <= 2) {
/*
* this is a kluge to make sure that declarations will be aligned
* right if proc decl has an explicit type on it, i.e. "int a(x) {..."
*/
parse(semicolon); /* I said this was a kluge... */
ps.init_or_struct = false;
}
/* parenthesized type following sizeof or offsetof is not a cast */
if (ps.keyword == kw_offsetof || ps.keyword == kw_sizeof)
ps.not_cast_mask |= 1 << ps.p_l_follow;
}
static void
process_rparen_or_rbracket(bool *sp_sw, bool *force_nl,
token_type hd_type)
{
if ((ps.cast_mask & (1 << ps.p_l_follow) & ~ps.not_cast_mask) != 0) {
ps.last_u_d = true;
ps.cast_mask &= (1 << ps.p_l_follow) - 1;
ps.want_blank = opt.space_after_cast;
} else
ps.want_blank = true;
ps.not_cast_mask &= (1 << ps.p_l_follow) - 1;
if (--ps.p_l_follow < 0) {
ps.p_l_follow = 0;
diag(0, "Extra %c", *token.s);
}
if (code.e == code.s) /* if the paren starts the line */
ps.paren_level = ps.p_l_follow; /* then indent it */
*code.e++ = token.s[0];
if (*sp_sw && ps.p_l_follow == 0) { /* check for end of if (...), or some
* such */
*sp_sw = false;
*force_nl = true; /* must force newline after if */
ps.last_u_d = true; /* inform lexi that a following operator is
* unary */
ps.in_stmt = false; /* don't use stmt continuation indentation */
parse(hd_type); /* let parser worry about if, or whatever */
}
/*
* This should ensure that constructs such as main(){...} and int[]{...}
* have their braces put in the right place.
*/
ps.search_brace = opt.brace_same_line;
}
static void
process_unary_op(int decl_ind, bool tabs_to_var)
{
if (!ps.dumped_decl_indent && ps.in_decl && !ps.block_init &&
ps.procname[0] == '\0' && ps.paren_level == 0) {
/* pointer declarations */
indent_declaration(decl_ind - (int)buf_len(&token), tabs_to_var);
ps.dumped_decl_indent = true;
} else if (ps.want_blank)
*code.e++ = ' ';
buf_add_buf(&code, &token);
ps.want_blank = false;
}
static void
process_binary_op(void)
{
if (ps.want_blank)
buf_add_char(&code, ' ');
buf_add_buf(&code, &token);
ps.want_blank = true;
}
static void
process_postfix_op(void)
{
*code.e++ = token.s[0];
*code.e++ = token.s[1];
ps.want_blank = true;
}
static void
process_question(int *seen_quest)
{
(*seen_quest)++;
if (ps.want_blank)
*code.e++ = ' ';
*code.e++ = '?';
ps.want_blank = true;
}
static void
process_colon(int *seen_quest, bool *force_nl, bool *seen_case)
{
if (*seen_quest > 0) { /* part of a '?:' operator */
--*seen_quest;
if (ps.want_blank)
*code.e++ = ' ';
*code.e++ = ':';
ps.want_blank = true;
return;
}
if (ps.init_or_struct) { /* bit-field */
*code.e++ = ':';
ps.want_blank = false;
return;
}
buf_add_buf(&lab, &code); /* 'case' or 'default' or named label */
buf_add_char(&lab, ':');
buf_terminate(&lab);
buf_reset(&code);
ps.in_stmt = false;
ps.is_case_label = *seen_case;
*force_nl = *seen_case;
*seen_case = false;
ps.want_blank = false;
}
static void
process_semicolon(bool *seen_case, int *seen_quest, int decl_ind,
bool tabs_to_var, bool *sp_sw,
token_type hd_type,
bool *force_nl)
{
if (ps.decl_nest == 0)
ps.init_or_struct = false;
*seen_case = false; /* these will only need resetting in an error */
*seen_quest = 0;
if (ps.last_token == rparen_or_rbracket)
ps.in_parameter_declaration = false;
ps.cast_mask = 0;
ps.not_cast_mask = 0;
ps.block_init = false;
ps.block_init_level = 0;
ps.just_saw_decl--;
if (ps.in_decl && code.s == code.e && !ps.block_init &&
!ps.dumped_decl_indent && ps.paren_level == 0) {
/* indent stray semicolons in declarations */
indent_declaration(decl_ind - 1, tabs_to_var);
ps.dumped_decl_indent = true;
}
ps.in_decl = ps.decl_nest > 0; /* if we were in a first level
* structure declaration, we aren't
* anymore */
if ((!*sp_sw || hd_type != for_exprs) && ps.p_l_follow > 0) {
/*
* There were unbalanced parens in the statement. It is a bit
* complicated, because the semicolon might be in a for statement.
*/
diag(1, "Unbalanced parens");
ps.p_l_follow = 0;
if (*sp_sw) { /* this is a check for an if, while, etc. with
* unbalanced parens */
*sp_sw = false;
parse(hd_type); /* don't lose the 'if', or whatever */
}
}
*code.e++ = ';';
ps.want_blank = true;
ps.in_stmt = (ps.p_l_follow > 0); /* we are no longer in the middle of a
* stmt */
if (!*sp_sw) { /* if not if for (;;) */
parse(semicolon); /* let parser know about end of stmt */
*force_nl = true; /* force newline after an end of stmt */
}
}
static void
process_lbrace(bool *force_nl, bool *sp_sw, token_type hd_type,
int *di_stack, int di_stack_cap, int *decl_ind)
{
ps.in_stmt = false; /* don't indent the {} */
if (!ps.block_init)
*force_nl = true; /* force other stuff on same line as '{' onto
* new line */
else if (ps.block_init_level <= 0)
ps.block_init_level = 1;
else
ps.block_init_level++;
if (code.s != code.e && !ps.block_init) {
if (!opt.brace_same_line) {
dump_line();
ps.want_blank = false;
} else if (ps.in_parameter_declaration && !ps.init_or_struct) {
ps.ind_level_follow = 0;
if (opt.function_brace_split) { /* dump the line prior to the
* brace ... */
dump_line();
ps.want_blank = false;
} else /* add a space between the decl and brace */
ps.want_blank = true;
}
}
if (ps.in_parameter_declaration)
blank_line_before = false;
if (ps.p_l_follow > 0) { /* check for preceding unbalanced parens */
diag(1, "Unbalanced parens");
ps.p_l_follow = 0;
if (*sp_sw) { /* check for unclosed if, for, etc. */
*sp_sw = false;
parse(hd_type);
ps.ind_level = ps.ind_level_follow;
}
}
if (code.s == code.e)
ps.ind_stmt = false; /* don't indent the '{' itself */
if (ps.in_decl && ps.init_or_struct) {
di_stack[ps.decl_nest] = *decl_ind;
if (++ps.decl_nest == di_stack_cap) {
diag(0, "Reached internal limit of %d struct levels",
di_stack_cap);
ps.decl_nest--;
}
} else {
ps.decl_on_line = false; /* we can't be in the middle of a
* declaration, so don't do special
* indentation of comments */
if (opt.blanklines_after_decl_at_top && ps.in_parameter_declaration)
blank_line_after = true;
ps.in_parameter_declaration = false;
ps.in_decl = false;
}
*decl_ind = 0;
parse(lbrace);
if (ps.want_blank)
*code.e++ = ' ';
ps.want_blank = false;
*code.e++ = '{';
ps.just_saw_decl = 0;
}
static void
process_rbrace(bool *sp_sw, int *decl_ind, const int *di_stack)
{
if (ps.p_stack[ps.tos] == decl && !ps.block_init) /* semicolons can be
* omitted in
* declarations */
parse(semicolon);
if (ps.p_l_follow != 0) { /* check for unclosed if, for, else. */
diag(1, "Unbalanced parens");
ps.p_l_follow = 0;
*sp_sw = false;
}
ps.just_saw_decl = 0;
ps.block_init_level--;
if (code.s != code.e && !ps.block_init) { /* '}' must be first on line */
if (opt.verbose)
diag(0, "Line broken");
dump_line();
}
*code.e++ = '}';
ps.want_blank = true;
ps.in_stmt = ps.ind_stmt = false;
if (ps.decl_nest > 0) { /* we are in multi-level structure declaration */
*decl_ind = di_stack[--ps.decl_nest];
if (ps.decl_nest == 0 && !ps.in_parameter_declaration)
ps.just_saw_decl = 2;
ps.in_decl = true;
}
blank_line_before = false;
parse(rbrace); /* let parser know about this */
ps.search_brace = opt.cuddle_else
&& ps.p_stack[ps.tos] == if_expr_stmt
&& ps.il[ps.tos] >= ps.ind_level;
if (ps.tos <= 1 && opt.blanklines_after_procs && ps.decl_nest <= 0)
blank_line_after = true;
}
static void
process_keyword_do(bool *force_nl, bool *last_else)
{
ps.in_stmt = false;
if (code.e != code.s) { /* make sure this starts a line */
if (opt.verbose)
diag(0, "Line broken");
dump_line();
ps.want_blank = false;
}
*force_nl = true; /* following stuff must go onto new line */
*last_else = false;
parse(keyword_do);
}
static void
process_keyword_else(bool *force_nl, bool *last_else)
{
ps.in_stmt = false;
if (code.e != code.s && (!opt.cuddle_else || code.e[-1] != '}')) {
if (opt.verbose)
diag(0, "Line broken");
dump_line(); /* make sure this starts a line */
ps.want_blank = false;
}
*force_nl = true; /* following stuff must go onto new line */
*last_else = true;
parse(keyword_else);
}
static void
process_decl(int *decl_ind, bool *tabs_to_var)
{
parse(decl); /* let parser worry about indentation */
if (ps.last_token == rparen_or_rbracket && ps.tos <= 1) {
if (code.s != code.e) {
dump_line();
ps.want_blank = false;
}
}
if (ps.in_parameter_declaration && opt.indent_parameters &&
ps.decl_nest == 0) {
ps.ind_level = ps.ind_level_follow = 1;
ps.ind_stmt = false;
}
ps.init_or_struct = /* maybe */ true;
ps.in_decl = ps.decl_on_line = ps.last_token != type_def;
if (ps.decl_nest <= 0)
ps.just_saw_decl = 2;
blank_line_before = false;
int len = (int)buf_len(&token) + 1;
int ind = ps.ind_level == 0 || ps.decl_nest > 0
? opt.decl_indent /* global variable or local member */
: opt.local_decl_indent; /* local variable */
*decl_ind = ind > 0 ? ind : len;
*tabs_to_var = opt.use_tabs && ind > 0;
}
static void
process_ident(token_type ttype, int decl_ind, bool tabs_to_var,
bool *sp_sw, bool *force_nl, token_type hd_type)
{
if (ps.in_decl) {
if (ttype == funcname) {
ps.in_decl = false;
if (opt.procnames_start_line && code.s != code.e) {
*code.e = '\0';
dump_line();
} else if (ps.want_blank) {
*code.e++ = ' ';
}
ps.want_blank = false;
} else if (!ps.block_init && !ps.dumped_decl_indent &&
ps.paren_level == 0) { /* if we are in a declaration, we must
* indent identifier */
indent_declaration(decl_ind, tabs_to_var);
ps.dumped_decl_indent = true;
ps.want_blank = false;
}
} else if (*sp_sw && ps.p_l_follow == 0) {
*sp_sw = false;
*force_nl = true;
ps.last_u_d = true;
ps.in_stmt = false;
parse(hd_type);
}
}
static void
copy_token(void)
{
if (ps.want_blank)
buf_add_char(&code, ' ');
buf_add_buf(&code, &token);
}
static void
process_string_prefix(void)
{
copy_token();
ps.want_blank = false;
}
static void
process_period(void)
{
if (code.e[-1] == ',')
*code.e++ = ' ';
*code.e++ = '.';
ps.want_blank = false;
}
static void
process_comma(int decl_ind, bool tabs_to_var, bool *force_nl)
{
ps.want_blank = code.s != code.e; /* only put blank after comma if comma
* does not start the line */
if (ps.in_decl && ps.procname[0] == '\0' && !ps.block_init &&
!ps.dumped_decl_indent && ps.paren_level == 0) {
/* indent leading commas and not the actual identifiers */
indent_declaration(decl_ind - 1, tabs_to_var);
ps.dumped_decl_indent = true;
}
*code.e++ = ',';
if (ps.p_l_follow == 0) {
if (ps.block_init_level <= 0)
ps.block_init = false;
if (break_comma && (opt.break_after_comma ||
indentation_after_range(
compute_code_indent(), code.s, code.e)
>= opt.max_line_length - opt.tabsize))
*force_nl = true;
}
}
/* move the whole line to the 'label' buffer */
static void
read_preprocessing_line(void)
{
enum {
PLAIN, STR, CHR, COMM
} state;
buf_add_char(&lab, '#');
state = PLAIN;
int com_start = 0, com_end = 0;
while (is_hspace(*inp.s))
inbuf_skip();
while (*inp.s != '\n' || (state == COMM && !had_eof)) {
buf_reserve(&lab, 2);
*lab.e++ = inbuf_next();
switch (lab.e[-1]) {
case '\\':
if (state != COMM)
*lab.e++ = inbuf_next();
break;
case '/':
if (*inp.s == '*' && state == PLAIN) {
state = COMM;
*lab.e++ = *inp.s++;
com_start = (int)buf_len(&lab) - 2;
}
break;
case '"':
if (state == STR)
state = PLAIN;
else if (state == PLAIN)
state = STR;
break;
case '\'':
if (state == CHR)
state = PLAIN;
else if (state == PLAIN)
state = CHR;
break;
case '*':
if (*inp.s == '/' && state == COMM) {
state = PLAIN;
*lab.e++ = *inp.s++;
com_end = (int)buf_len(&lab);
}
break;
}
}
while (lab.e > lab.s && is_hspace(lab.e[-1]))
lab.e--;
if (lab.e - lab.s == com_end && saved_inp_s == NULL) {
/* comment on preprocessor line */
if (sc_end == NULL) { /* if this is the first comment, we must set
* up the buffer */
save_com = sc_buf;
sc_end = save_com;
} else {
*sc_end++ = '\n'; /* add newline between comments */
*sc_end++ = ' ';
--line_no;
}
if (sc_end - save_com + com_end - com_start > sc_size)
errx(1, "input too long");
memmove(sc_end, lab.s + com_start, (size_t)(com_end - com_start));
sc_end += com_end - com_start;
lab.e = lab.s + com_start;
while (lab.e > lab.s && is_hspace(lab.e[-1]))
lab.e--;
saved_inp_s = inp.s; /* save current input buffer */
saved_inp_e = inp.e;
inp.s = save_com; /* fix so that subsequent calls to lexi will
* take tokens out of save_com */
*sc_end++ = ' '; /* add trailing blank, just in case */
inp.e = sc_end;
sc_end = NULL;
debug_println("switched inp.s to save_com");
}
buf_terminate(&lab);
}
static void
process_preprocessing(void)
{
if (com.s != com.e || lab.s != lab.e || code.s != code.e)
dump_line();
read_preprocessing_line();
ps.is_case_label = false;
if (strncmp(lab.s, "#if", 3) == 0) { /* also ifdef, ifndef */
if ((size_t)ifdef_level < nitems(state_stack))
state_stack[ifdef_level++] = ps;
else
diag(1, "#if stack overflow");
} else if (strncmp(lab.s, "#el", 3) == 0) { /* else, elif */
if (ifdef_level <= 0)
diag(1, lab.s[3] == 'i' ? "Unmatched #elif" : "Unmatched #else");
else
ps = state_stack[ifdef_level - 1];
} else if (strncmp(lab.s, "#endif", 6) == 0) {
if (ifdef_level <= 0)
diag(1, "Unmatched #endif");
else
ifdef_level--;
} else {
if (strncmp(lab.s + 1, "pragma", 6) != 0 &&
strncmp(lab.s + 1, "error", 5) != 0 &&
strncmp(lab.s + 1, "line", 4) != 0 &&
strncmp(lab.s + 1, "undef", 5) != 0 &&
strncmp(lab.s + 1, "define", 6) != 0 &&
strncmp(lab.s + 1, "include", 7) != 0) {
diag(1, "Unrecognized cpp directive");
return;
}
}
if (opt.blanklines_around_conditional_compilation) {
blank_line_after = true;
blank_lines_to_output = 0;
} else {
blank_line_after = false;
blank_line_before = false;
}
/*
* subsequent processing of the newline character will cause the line to
* be printed
*/
}
static void __attribute__((__noreturn__))
main_loop(void)
{
token_type ttype;
bool force_nl; /* when true, code must be broken */
bool last_else = false; /* true iff last keyword was an else */
int decl_ind; /* current indentation for declarations */
int di_stack[20]; /* a stack of structure indentation levels */
bool tabs_to_var; /* true if using tabs to indent to var name */
bool sp_sw; /* when true, we are in the expression of
* if(...), while(...), etc. */
token_type hd_type = end_of_file; /* the type of statement for if (...),
* for (...), etc */
int seen_quest; /* when this is positive, we have seen a '?'
* without the matching ':' in a <c>?<s>:<s>
* construct */
bool seen_case; /* set to true when we see a 'case', so we
* know what to do with the following colon */
sp_sw = force_nl = false;
decl_ind = 0;
di_stack[ps.decl_nest = 0] = 0;
seen_case = false;
seen_quest = 0;
tabs_to_var = false;
for (;;) { /* this is the main loop. it will go until we
* reach eof */
bool comment_buffered = false;
ttype = lexi(&ps); /* Read the next token. The actual characters
* read are stored in "token". */
/*
* Move newlines and comments following an if (), while (), else, etc.
* up to the start of the following stmt to a buffer. This allows
* proper handling of both kinds of brace placement (-br, -bl) and
* cuddling "else" (-ce).
*/
search_brace(&ttype, &force_nl, &comment_buffered, &last_else);
if (ttype == end_of_file) {
process_end_of_file();
/* NOTREACHED */
}
if (ttype == newline || ttype == form_feed || ttype == preprocessing)
force_nl = false;
else if (ttype != comment)
process_comment_in_code(ttype, &force_nl);
buf_reserve(&code, 3); /* space for 2 characters plus '\0' */
switch (ttype) {
case form_feed:
process_form_feed();
break;
case newline:
process_newline();
break;
case lparen_or_lbracket:
process_lparen_or_lbracket(decl_ind, tabs_to_var, sp_sw);
break;
case rparen_or_rbracket:
process_rparen_or_rbracket(&sp_sw, &force_nl, hd_type);
break;
case unary_op:
process_unary_op(decl_ind, tabs_to_var);
break;
case binary_op:
process_binary_op();
break;
case postfix_op:
process_postfix_op();
break;
case question:
process_question(&seen_quest);
break;
case case_label: /* got word 'case' or 'default' */
seen_case = true;
goto copy_token;
case colon:
process_colon(&seen_quest, &force_nl, &seen_case);
break;
case semicolon:
process_semicolon(&seen_case, &seen_quest, decl_ind, tabs_to_var,
&sp_sw, hd_type, &force_nl);
break;
case lbrace:
process_lbrace(&force_nl, &sp_sw, hd_type, di_stack,
(int)nitems(di_stack), &decl_ind);
break;
case rbrace:
process_rbrace(&sp_sw, &decl_ind, di_stack);
break;
case switch_expr: /* got keyword "switch" */
sp_sw = true;
hd_type = switch_expr; /* keep this for when we have seen the
* expression */
goto copy_token;
case keyword_for_if_while:
sp_sw = true; /* the interesting stuff is done after the
* expression is scanned */
hd_type = *token.s == 'i' ? if_expr :
*token.s == 'w' ? while_expr : for_exprs;
/* remember the type of header for later use by parser */
goto copy_token;
case keyword_do_else:
if (*token.s == 'd')
process_keyword_do(&force_nl, &last_else);
else
process_keyword_else(&force_nl, &last_else);
goto copy_token;
case type_def:
case storage_class:
blank_line_before = false;
goto copy_token;
case keyword_struct_union_enum:
if (ps.p_l_follow > 0)
goto copy_token;
/* FALLTHROUGH */
case decl: /* a declaration type (int, etc.) */
process_decl(&decl_ind, &tabs_to_var);
goto copy_token;
case funcname:
case ident: /* an identifier, constant or string */
process_ident(ttype, decl_ind, tabs_to_var, &sp_sw, &force_nl,
hd_type);
copy_token:
copy_token();
if (ttype != funcname)
ps.want_blank = true;
break;
case string_prefix:
process_string_prefix();
break;
case period:
process_period();
break;
case comma:
process_comma(decl_ind, tabs_to_var, &force_nl);
break;
case preprocessing: /* the initial '#' */
process_preprocessing();
break;
case comment: /* the initial '/' '*' or '//' of a comment */
process_comment();
break;
default:
break;
}
*code.e = '\0';
if (ttype != comment && ttype != newline && ttype != preprocessing)
ps.last_token = ttype;
}
}
int
main(int argc, char **argv)
{
main_init_globals();
main_parse_command_line(argc, argv);
#if HAVE_CAPSICUM
init_capsicum();
#endif
main_prepare_parsing();
main_loop();
}
#ifdef debug
void
debug_printf(const char *fmt, ...)
{
FILE *f = output == stdout ? stderr : stdout;
va_list ap;
va_start(ap, fmt);
vfprintf(f, fmt, ap);
va_end(ap);
}
void
debug_println(const char *fmt, ...)
{
FILE *f = output == stdout ? stderr : stdout;
va_list ap;
va_start(ap, fmt);
vfprintf(f, fmt, ap);
va_end(ap);
fprintf(f, "\n");
}
void
debug_vis_range(const char *prefix, const char *s, const char *e,
const char *suffix)
{
debug_printf("%s", prefix);
for (const char *p = s; p < e; p++) {
if (isprint((unsigned char)*p) && *p != '\\' && *p != '"')
debug_printf("%c", *p);
else if (*p == '\n')
debug_printf("\\n");
else if (*p == '\t')
debug_printf("\\t");
else
debug_printf("\\x%02x", *p);
}
debug_printf("%s", suffix);
}
#endif
static void *
nonnull(void *p)
{
if (p == NULL)
err(EXIT_FAILURE, NULL);
return p;
}
void *
xmalloc(size_t size)
{
return nonnull(malloc(size));
}
void *
xrealloc(void *p, size_t new_size)
{
return nonnull(realloc(p, new_size));
}
char *
xstrdup(const char *s)
{
return nonnull(strdup(s));
}
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