File: [cvs.NetBSD.org] / src / usr.bin / indent / indent.c (download)
Revision 1.214, Sun Nov 7 14:00:35 2021 UTC (2 years, 5 months ago) by rillig
Branch: MAIN
Changes since 1.213: +4 -4
lines
indent: reduce negations in process_else, clean up comments
No functional change.
|
/* $NetBSD: indent.c,v 1.214 2021/11/07 14:00:35 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 1.214 2021/11/07 14:00:35 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 <assert.h>
#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 inp;
struct buffer token;
struct buffer lab;
struct buffer code;
struct buffer com;
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 = 1;
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
buf_init(struct buffer *buf)
{
size_t size = 200;
buf->buf = xmalloc(size);
buf->l = buf->buf + size - 5 /* safety margin */;
buf->s = buf->buf + 1; /* allow accessing buf->e[-1] */
buf->e = buf->s;
buf->buf[0] = ' ';
buf->buf[1] = '\0';
}
static size_t
buf_len(const struct buffer *buf)
{
return (size_t)(buf->e - buf->s);
}
void
buf_expand(struct buffer *buf, size_t add_size)
{
size_t new_size = (size_t)(buf->l - buf->s) + 400 + add_size;
size_t len = buf_len(buf);
buf->buf = xrealloc(buf->buf, new_size);
buf->l = buf->buf + new_size - 5;
buf->s = buf->buf + 1;
buf->e = buf->s + len;
/* At this point, the buffer may not be null-terminated anymore. */
}
static void
buf_reserve(struct buffer *buf, size_t n)
{
if (n >= (size_t)(buf->l - buf->e))
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;
}
void
diag(int level, const char *msg, ...)
{
va_list ap;
if (level != 0)
found_err = true;
va_start(ap, msg);
fprintf(stderr, "%s: %s:%d: ",
level == 0 ? "warning" : "error", in_name, line_no);
vfprintf(stderr, msg, ap);
fprintf(stderr, "\n");
va_end(ap);
}
#ifdef debug
static void
debug_save_com(const char *prefix)
{
debug_printf("%s: save_com is ", prefix);
debug_vis_range("\"", save_com, sc_end, "\"\n");
}
#else
#define debug_save_com(prefix) do { } while (false)
#endif
static void
sc_check_size(size_t n)
{
if ((size_t)(sc_end - sc_buf) + n <= sc_size)
return;
diag(1, "Internal buffer overflow - "
"Move big comment from right after if, while, or whatever");
fflush(output);
exit(1);
}
static void
sc_add_char(char ch)
{
sc_check_size(1);
*sc_end++ = ch;
}
static void
sc_add_range(const char *s, const char *e)
{
size_t len = (size_t)(e - s);
sc_check_size(len);
memcpy(sc_end, s, len);
sc_end += len;
}
static void
search_stmt_newline(bool *force_nl)
{
if (sc_end == NULL) {
save_com = sc_buf;
save_com[0] = save_com[1] = ' ';
sc_end = &save_com[2];
debug_save_com("search_stmt_newline init");
}
sc_add_char('\n');
debug_save_com(__func__);
line_no++;
/*
* 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_stmt_comment(void)
{
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.
*/
/*
* FIXME: This '4' needs an explanation. For example, in the snippet
* 'if(expr)/''*comment', the 'r)' of the code is not copied. If there
* is an additional line break before the ')', memcpy tries to copy
* (size_t)-1 bytes.
*/
assert((size_t)(inp.s - inp.buf) >= 4);
size_t line_len = (size_t)(inp.s - inp.buf) - 4;
assert(line_len < array_length(sc_buf));
memcpy(sc_buf, inp.buf, line_len);
save_com = sc_buf + line_len;
save_com[0] = save_com[1] = ' ';
sc_end = &save_com[2];
debug_vis_range("search_stmt_comment: before save_com is \"",
sc_buf, save_com, "\"\n");
debug_vis_range("search_stmt_comment: save_com is \"",
save_com, sc_end, "\"\n");
}
sc_add_char('/');
sc_add_char('*');
for (;;) { /* loop until the end of the comment */
sc_add_char(inp_next());
if (sc_end[-1] == '*' && *inp.s == '/') {
sc_add_char(inp_next());
debug_save_com("search_stmt_comment end");
break;
}
}
}
static bool
search_stmt_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) {
assert(save_com[0] == ' '); /* see search_stmt_comment */
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)) {
inp_skip();
if (*inp.s == '\n')
break;
}
debug_save_com(__func__);
return true;
}
return false;
}
static bool
search_stmt_other(lexer_symbol lsym, bool *force_nl,
bool comment_buffered, bool last_else)
{
bool remove_newlines;
remove_newlines =
/* "} else" */
(lsym == lsym_else && code.e != code.s && code.e[-1] == '}')
/* "else if" */
|| (lsym == lsym_if && 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_stmt = false;
return false;
}
debug_save_com(__func__);
while (sc_end > save_com && ch_isblank(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_add_char('\n');
sc_add_char(' ');
if (opt.verbose) /* warn if the line was not already broken */
diag(0, "Line broken");
}
for (const char *t_ptr = token.s; *t_ptr != '\0'; ++t_ptr)
sc_add_char(*t_ptr);
debug_save_com("search_stmt_other end");
return true;
}
static void
switch_buffer(void)
{
ps.search_stmt = false;
sc_add_char(' '); /* add trailing blank, just in case */
debug_save_com(__func__);
saved_inp_s = inp.s;
saved_inp_e = inp.e;
inp.s = save_com; /* redirect lexi input to save_com */
inp.e = sc_end;
sc_end = NULL;
debug_println("switched inp.s to save_com");
}
static void
search_stmt_lookahead(lexer_symbol *lsym)
{
if (*lsym == lsym_eof)
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 (ch_isblank(*inp.s))
sc_add_char(inp_next());
debug_save_com(__func__);
}
struct parser_state backup_ps = ps;
debug_println("made backup of parser state");
*lsym = lexi();
if (*lsym == lsym_newline || *lsym == lsym_form_feed ||
*lsym == lsym_comment || ps.search_stmt) {
ps = backup_ps;
debug_println("rolled back parser state");
}
}
/*
* Move newlines and comments following an 'if (expr)', 'while (expr)',
* 'else', etc. up to the start of the following statement to a buffer. This
* allows proper handling of both kinds of brace placement (-br, -bl) and
* "cuddling else" (-ce).
*/
static void
search_stmt(lexer_symbol *lsym, bool *force_nl, bool *last_else)
{
bool comment_buffered = false;
while (ps.search_stmt) {
switch (*lsym) {
case lsym_newline:
search_stmt_newline(force_nl);
break;
case lsym_form_feed:
break;
case lsym_comment:
search_stmt_comment();
comment_buffered = true;
break;
case lsym_lbrace:
if (search_stmt_lbrace())
goto switch_buffer;
/* FALLTHROUGH */
default:
if (!search_stmt_other(*lsym, force_nl, comment_buffered,
*last_else))
return;
switch_buffer:
switch_buffer();
}
search_stmt_lookahead(lsym);
}
*last_else = false;
}
static void
main_init_globals(void)
{
inp.buf = xmalloc(10);
inp.l = inp.buf + 8;
inp.s = inp.buf;
inp.e = inp.buf;
buf_init(&token);
buf_init(&lab);
buf_init(&code);
buf_init(&com);
ps.s_sym[0] = psym_stmt_list;
ps.prev_token = lsym_semicolon;
ps.next_col_1 = true;
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_load_profiles(int argc, char **argv)
{
const char *profile_name = NULL;
for (int i = 1; i < argc; ++i) {
const char *arg = argv[i];
if (strcmp(arg, "-npro") == 0)
return;
if (arg[0] == '-' && arg[1] == 'P' && arg[2] != '\0')
profile_name = arg + 2;
}
load_profiles(profile_name);
}
static void
main_parse_command_line(int argc, char **argv)
{
for (int i = 1; i < argc; ++i) {
const char *arg = argv[i];
if (arg[0] == '-') {
set_option(arg, "Command line");
} else if (input == NULL) {
in_name = arg;
if ((input = fopen(in_name, "r")) == NULL)
err(1, "%s", in_name);
} else if (output == NULL) {
out_name = arg;
if (strcmp(in_name, out_name) == 0)
errx(1, "input and output files must be different");
if ((output = fopen(out_name, "w")) == NULL)
err(1, "%s", out_name);
} else
errx(1, "too many arguments: %s", arg);
}
if (input == NULL) {
input = stdin;
output = stdout;
} else if (output == NULL) {
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)
{
inp_read_line();
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
code_add_decl_indent(int decl_ind, bool tabs_to_var)
{
int base_ind = ps.ind_level * opt.indent_size;
int ind = base_ind + (int)buf_len(&code);
int target_ind = base_ind + decl_ind;
char *orig_code_e = code.e;
if (tabs_to_var)
for (int next; (next = next_tab(ind)) <= target_ind; ind = next)
buf_add_char(&code, '\t');
for (; ind < target_ind; ind++)
buf_add_char(&code, ' ');
if (code.e == orig_code_e && ps.want_blank) {
buf_add_char(&code, ' ');
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
maybe_break_line(lexer_symbol lsym, bool *force_nl)
{
if (!*force_nl)
return;
if (lsym == lsym_semicolon)
return;
else if (lsym == lsym_lbrace && opt.brace_same_line)
return;
if (opt.verbose)
diag(0, "Line broken");
dump_line();
ps.want_blank = false;
*force_nl = false;
}
static void
move_com_to_code(void)
{
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)
{
dump_line_ff();
ps.want_blank = false;
}
static void
process_newline(void)
{
if (ps.prev_token == lsym_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 (opt.proc_calls_space)
return true;
if (ps.prev_token == lsym_rparen_or_rbracket)
return false;
if (ps.prev_token == lsym_offsetof)
return false;
if (ps.prev_token == lsym_sizeof)
return opt.blank_after_sizeof;
if (ps.prev_token == lsym_word || ps.prev_token == lsym_funcname)
return false;
return true;
}
static void
process_lparen_or_lbracket(int decl_ind, bool tabs_to_var, bool spaced_expr)
{
if (++ps.p_l_follow == array_length(ps.paren_indents)) {
diag(0, "Reached internal limit of %zu unclosed parentheses",
array_length(ps.paren_indents));
ps.p_l_follow--;
}
if (token.s[0] == '(' && ps.in_decl
&& !ps.block_init && !ps.decl_indent_done &&
ps.procname[0] == '\0' && ps.paren_level == 0) {
/* function pointer declarations */
code_add_decl_indent(decl_ind, tabs_to_var);
ps.decl_indent_done = 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)ind_add(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 (spaced_expr && 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(psym_semicolon); /* I said this was a kluge... */
ps.init_or_struct = false;
}
/* parenthesized type following sizeof or offsetof is not a cast */
if (ps.prev_token == lsym_offsetof || ps.prev_token == lsym_sizeof)
ps.not_cast_mask |= 1 << ps.p_l_follow;
}
static void
process_rparen_or_rbracket(bool *spaced_expr, bool *force_nl, stmt_head hd)
{
if ((ps.cast_mask & (1 << ps.p_l_follow) & ~ps.not_cast_mask) != 0) {
ps.next_unary = 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--;
else
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 (*spaced_expr && ps.p_l_follow == 0) { /* check for end of 'if
* (...)', or some such */
*spaced_expr = false;
*force_nl = true; /* must force newline after if */
ps.next_unary = true;
ps.in_stmt = false; /* don't use stmt continuation indentation */
parse_stmt_head(hd);
}
/*
* This should ensure that constructs such as main(){...} and int[]{...}
* have their braces put in the right place.
*/
ps.search_stmt = opt.brace_same_line;
}
static bool
want_blank_before_unary_op(void)
{
if (ps.want_blank)
return true;
if (token.s[0] == '+' || token.s[0] == '-')
return code.e > code.s && code.e[-1] == token.s[0];
return false;
}
static void
process_unary_op(int decl_ind, bool tabs_to_var)
{
if (!ps.decl_indent_done && ps.in_decl && !ps.block_init &&
ps.procname[0] == '\0' && ps.paren_level == 0) {
/* pointer declarations */
code_add_decl_indent(decl_ind - (int)buf_len(&token), tabs_to_var);
ps.decl_indent_done = true;
} else if (want_blank_before_unary_op())
*code.e++ = ' ';
buf_add_buf(&code, &token);
ps.want_blank = false;
}
static void
process_binary_op(void)
{
if (buf_len(&code) > 0)
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 *quest_level)
{
(*quest_level)++;
if (ps.want_blank)
*code.e++ = ' ';
*code.e++ = '?';
ps.want_blank = true;
}
static void
process_colon(int *quest_level, bool *force_nl, bool *seen_case)
{
if (*quest_level > 0) { /* part of a '?:' operator */
--*quest_level;
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 *quest_level, int decl_ind,
bool tabs_to_var, bool *spaced_expr, stmt_head hd, bool *force_nl)
{
if (ps.decl_nest == 0)
ps.init_or_struct = false;
*seen_case = false; /* these will only need resetting in an error */
*quest_level = 0;
if (ps.prev_token == lsym_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.decl_indent_done && ps.paren_level == 0) {
/* indent stray semicolons in declarations */
code_add_decl_indent(decl_ind - 1, tabs_to_var);
ps.decl_indent_done = true;
}
ps.in_decl = ps.decl_nest > 0; /* if we were in a first level
* structure declaration, we aren't
* anymore */
if ((!*spaced_expr || hd != hd_for) && ps.p_l_follow > 0) {
/*
* There were unbalanced parentheses in the statement. It is a bit
* complicated, because the semicolon might be in a for statement.
*/
diag(1, "Unbalanced parentheses");
ps.p_l_follow = 0;
if (*spaced_expr) { /* 'if', 'while', etc. */
*spaced_expr = false;
parse_stmt_head(hd);
}
}
*code.e++ = ';';
ps.want_blank = true;
ps.in_stmt = ps.p_l_follow > 0;
if (!*spaced_expr) { /* if not if for (;;) */
parse(psym_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 *spaced_expr, stmt_head hd,
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) {
diag(1, "Unbalanced parentheses");
ps.p_l_follow = 0;
if (*spaced_expr) { /* check for unclosed 'if', 'for', etc. */
*spaced_expr = false;
parse_stmt_head(hd);
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(psym_lbrace);
if (ps.want_blank)
*code.e++ = ' ';
ps.want_blank = false;
*code.e++ = '{';
ps.just_saw_decl = 0;
}
static void
process_rbrace(bool *spaced_expr, int *decl_ind, const int *di_stack)
{
if (ps.s_sym[ps.tos] == psym_decl && !ps.block_init) {
/* semicolons can be omitted in declarations */
parse(psym_semicolon);
}
if (ps.p_l_follow > 0) { /* check for unclosed if, for, else. */
diag(1, "Unbalanced parentheses");
ps.p_l_follow = 0;
*spaced_expr = 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;
*decl_ind = ps.ind_level == 0
? opt.decl_indent : opt.local_decl_indent;
}
ps.in_decl = true;
}
blank_line_before = false;
parse(psym_rbrace);
ps.search_stmt = opt.cuddle_else
&& ps.s_sym[ps.tos] == psym_if_expr_stmt
&& ps.s_ind_level[ps.tos] >= ps.ind_level;
if (ps.tos <= 1 && opt.blanklines_after_procs && ps.decl_nest <= 0)
blank_line_after = true;
}
static void
process_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(psym_do);
}
static void
process_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(psym_else);
}
static void
process_type(int *decl_ind, bool *tabs_to_var)
{
parse(psym_decl); /* let the parser worry about indentation */
if (ps.prev_token == lsym_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.prev_token != lsym_typedef;
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(lexer_symbol lsym, int decl_ind, bool tabs_to_var,
bool *spaced_expr, bool *force_nl, stmt_head hd)
{
if (ps.in_decl) {
if (lsym == lsym_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.decl_indent_done &&
ps.paren_level == 0) {
code_add_decl_indent(decl_ind, tabs_to_var);
ps.decl_indent_done = true;
ps.want_blank = false;
}
} else if (*spaced_expr && ps.p_l_follow == 0) {
*spaced_expr = false;
*force_nl = true;
ps.next_unary = true;
ps.in_stmt = false;
parse_stmt_head(hd);
}
}
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 > code.s && 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.decl_indent_done && ps.paren_level == 0) {
/* indent leading commas and not the actual identifiers */
code_add_decl_indent(decl_ind - 1, tabs_to_var);
ps.decl_indent_done = true;
}
*code.e++ = ',';
if (ps.p_l_follow == 0) {
if (ps.block_init_level <= 0)
ps.block_init = false;
int varname_len = 8; /* rough estimate for the length of a typical
* variable name */
if (break_comma && (opt.break_after_comma ||
ind_add(compute_code_indent(), code.s, code.e)
>= opt.max_line_length - varname_len))
*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 (ch_isblank(*inp.s))
inp_skip();
while (*inp.s != '\n' || (state == COMM && !had_eof)) {
buf_reserve(&lab, 2);
*lab.e++ = inp_next();
switch (lab.e[-1]) {
case '\\':
if (state != COMM)
*lab.e++ = inp_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 && ch_isblank(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_add_char('\n'); /* add newline between comments */
sc_add_char(' ');
--line_no;
}
sc_add_range(lab.s + com_start, lab.s + com_end);
lab.e = lab.s + com_start;
while (lab.e > lab.s && ch_isblank(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_add_char(' '); /* add trailing blank, just in case */
debug_save_com(__func__);
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 < array_length(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)
{
bool force_nl = false; /* when true, code must be broken */
bool last_else = false; /* true iff last keyword was an else */
int decl_ind = 0; /* current indentation for declarations */
int di_stack[20]; /* a stack of structure indentation levels */
bool tabs_to_var = false; /* true if using tabs to indent to var name */
bool spaced_expr = false; /* whether we are in the expression of
* if(...), while(...), etc. */
stmt_head hd = hd_0; /* the type of statement for 'if (...)', 'for
* (...)', etc */
int quest_level = 0; /* when this is positive, we have seen a '?'
* without the matching ':' in a '?:'
* expression */
bool seen_case = false; /* set to true when we see a 'case', so we
* know what to do with the following colon */
di_stack[ps.decl_nest = 0] = 0;
for (;;) { /* loop until we reach eof */
lexer_symbol lsym = lexi();
search_stmt(&lsym, &force_nl, &last_else);
if (lsym == lsym_eof) {
process_end_of_file();
/* NOTREACHED */
}
if (lsym == lsym_newline || lsym == lsym_form_feed ||
lsym == lsym_preprocessing)
force_nl = false;
else if (lsym != lsym_comment) {
maybe_break_line(lsym, &force_nl);
ps.in_stmt = true; /* add an extra level of indentation; turned
* off again by a ';' or '}' */
if (com.s != com.e)
move_com_to_code();
}
buf_reserve(&code, 3); /* space for 2 characters plus '\0' */
switch (lsym) {
case lsym_form_feed:
process_form_feed();
break;
case lsym_newline:
process_newline();
break;
case lsym_lparen_or_lbracket:
process_lparen_or_lbracket(decl_ind, tabs_to_var, spaced_expr);
break;
case lsym_rparen_or_rbracket:
process_rparen_or_rbracket(&spaced_expr, &force_nl, hd);
break;
case lsym_unary_op:
process_unary_op(decl_ind, tabs_to_var);
break;
case lsym_binary_op:
process_binary_op();
break;
case lsym_postfix_op:
process_postfix_op();
break;
case lsym_question:
process_question(&quest_level);
break;
case lsym_case_label:
seen_case = true;
goto copy_token;
case lsym_colon:
process_colon(&quest_level, &force_nl, &seen_case);
break;
case lsym_semicolon:
process_semicolon(&seen_case, &quest_level, decl_ind, tabs_to_var,
&spaced_expr, hd, &force_nl);
break;
case lsym_lbrace:
process_lbrace(&force_nl, &spaced_expr, hd, di_stack,
(int)array_length(di_stack), &decl_ind);
break;
case lsym_rbrace:
process_rbrace(&spaced_expr, &decl_ind, di_stack);
break;
case lsym_switch:
spaced_expr = true; /* the interesting stuff is done after the
* expressions are scanned */
hd = hd_switch; /* remember the type of header for later use
* by the parser */
goto copy_token;
case lsym_for:
spaced_expr = true;
hd = hd_for;
goto copy_token;
case lsym_if:
spaced_expr = true;
hd = hd_if;
goto copy_token;
case lsym_while:
spaced_expr = true;
hd = hd_while;
goto copy_token;
case lsym_do:
process_do(&force_nl, &last_else);
goto copy_token;
case lsym_else:
process_else(&force_nl, &last_else);
goto copy_token;
case lsym_typedef:
case lsym_storage_class:
blank_line_before = false;
goto copy_token;
case lsym_tag:
if (ps.p_l_follow > 0)
goto copy_token;
/* FALLTHROUGH */
case lsym_type_outside_parentheses:
process_type(&decl_ind, &tabs_to_var);
goto copy_token;
case lsym_type_in_parentheses:
case lsym_offsetof:
case lsym_sizeof:
case lsym_word:
case lsym_funcname:
case lsym_return:
process_ident(lsym, decl_ind, tabs_to_var, &spaced_expr,
&force_nl, hd);
copy_token:
copy_token();
if (lsym != lsym_funcname)
ps.want_blank = true;
break;
case lsym_string_prefix:
process_string_prefix();
break;
case lsym_period:
process_period();
break;
case lsym_comma:
process_comma(decl_ind, tabs_to_var, &force_nl);
break;
case lsym_preprocessing:
process_preprocessing();
break;
case lsym_comment:
process_comment();
break;
default:
break;
}
*code.e = '\0';
if (lsym != lsym_comment && lsym != lsym_newline &&
lsym != lsym_preprocessing)
ps.prev_token = lsym;
}
}
int
main(int argc, char **argv)
{
main_init_globals();
main_load_profiles(argc, argv);
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 (*p == '\\' || *p == '"')
debug_printf("\\%c", *p);
else if (isprint((unsigned char)*p))
debug_printf("%c", *p);
else if (*p == '\n')
debug_printf("\\n");
else if (*p == '\t')
debug_printf("\\t");
else
debug_printf("\\x%02x", (unsigned char)*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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