/*      $NetBSD: args.c,v 1.88 2024/12/12 05:51:50 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.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: args.c,v 1.88 2024/12/12 05:51:50 rillig Exp $");

/* Read options from profile files and from the command line. */

#include <err.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "indent.h"

#if __STDC_VERSION__ >= 201112L
#define get_offset(name, type) \
       _Generic((&opt.name), type *: offsetof(struct options, name))
#else
#define get_offset(name, type) (offsetof(struct options, name))
#endif

#define bool_option(name, value, var) \
       {name, true, false, value, 0, 0, get_offset(var, bool)}
#define bool_options(name, var) \
       {name, true, true, false, 0, 0, get_offset(var, bool)}
#define int_option(name, var, min, max) \
       {name, false, false, false, min, max, get_offset(var, int)}

/* See set_special_option for special options. */
static const struct pro {
       const char p_name[5];   /* e.g. "bl", "cli" */
       bool p_is_bool:1;
       bool p_may_negate:1;
       bool p_bool_value:1;    /* only relevant if !p_may_negate */
       short i_min;
       short i_max;
       unsigned short opt_offset;      /* the associated variable */
} pro[] = {
       bool_options("bacc", blank_line_around_conditional_compilation),
       bool_options("bad", blank_line_after_decl),
       bool_options("badp", blank_line_after_decl_at_top),
       bool_options("bap", blank_line_after_proc),
       bool_options("bbb", blank_line_before_block_comment),
       bool_options("bc", break_after_comma),
       bool_option("bl", false, brace_same_line),
       bool_option("br", true, brace_same_line),
       bool_options("bs", blank_after_sizeof),
       int_option("c", comment_column, 1, 999),
       int_option("cd", decl_comment_column, 1, 999),
       bool_options("cdb", comment_delimiter_on_blank_line),
       bool_options("ce", cuddle_else),
       int_option("ci", continuation_indent, 0, 999),
       /* "cli" is special */
       bool_options("cs", space_after_cast),
       int_option("d", unindent_displace, -999, 999),
       int_option("di", decl_indent, 0, 999),
       bool_options("dj", left_justify_decl),
       bool_options("eei", extra_expr_indent),
       bool_options("ei", else_if_in_same_line),
       bool_options("fbs", function_brace_split),
       bool_options("fc1", format_col1_comments),
       bool_options("fcb", format_block_comments),
       int_option("i", indent_size, 1, 80),
       bool_options("ip", indent_parameters),
       int_option("l", max_line_length, 1, 999),
       int_option("lc", block_comment_max_line_length, 1, 999),
       int_option("ldi", local_decl_indent, 0, 999),
       bool_options("lp", lineup_to_parens),
       bool_options("lpl", lineup_to_parens_always),
       /* "npro" is special */
       /* "P" is special */
       bool_options("pcs", proc_calls_space),
       bool_options("psl", procnames_start_line),
       bool_options("sc", star_comment_cont),
       bool_options("sob", swallow_optional_blank_lines),
       /* "st" is special */
       bool_option("ta", true, auto_typedefs),
       /* "T" is special */
       int_option("ts", tabsize, 1, 80),
       /* "U" is special */
       bool_options("ut", use_tabs),
       bool_options("v", verbose),
       /* "-version" is special */
};


static void
add_typedefs_from_file(const char *fname)
{
       FILE *file;
       char line[BUFSIZ];

       if ((file = fopen(fname, "r")) == NULL) {
               (void)fprintf(stderr, "indent: cannot open file %s\n", fname);
               exit(1);
       }
       while ((fgets(line, sizeof(line), file)) != NULL) {
               /* Only keep the first word of the line. */
               line[strcspn(line, " \t\n\r")] = '\0';
               register_typename(line);
       }
       (void)fclose(file);
}

static bool
set_special_option(const char *arg, const char *option_source)
{
       const char *arg_end;

       if (strcmp(arg, "-version") == 0) {
               printf("NetBSD indent 2.1\n");
               exit(0);
       }

       if (arg[0] == 'P' || strcmp(arg, "npro") == 0)
               return true;    /* see load_profiles */

       if (strncmp(arg, "cli", 3) == 0) {
               arg_end = arg + 3;
               if (arg_end[0] == '\0')
                       goto need_arg;
               char *end;
               opt.case_indent = (float)strtod(arg_end, &end);
               if (*end != '\0')
                       errx(1, "%s: argument \"%s\" to option \"-%.*s\" "
                           "must be numeric",
                           option_source, arg_end, (int)(arg_end - arg), arg);
               return true;
       }

       if (strcmp(arg, "st") == 0) {
               if (in.f == NULL)
                       in.f = stdin;
               if (output == NULL)
                       output = stdout;
               return true;
       }

       if (arg[0] == 'T') {
               arg_end = arg + 1;
               if (arg_end[0] == '\0')
                       goto need_arg;
               register_typename(arg_end);
               return true;
       }

       if (arg[0] == 'U') {
               arg_end = arg + 1;
               if (arg_end[0] == '\0')
                       goto need_arg;
               add_typedefs_from_file(arg_end);
               return true;
       }

       return false;

need_arg:
       errx(1, "%s: option \"-%.*s\" requires an argument",
           option_source, (int)(arg_end - arg), arg);
       /* NOTREACHED */
}

static const char *
skip_over(const char *s, bool may_negate, const char *prefix)
{
       if (may_negate && s[0] == 'n')
               s++;
       while (*prefix != '\0') {
               if (*prefix++ != *s++)
                       return NULL;
       }
       return s;
}

void
set_option(const char *arg, const char *option_source)
{
       const struct pro *p;
       const char *arg_arg;

       arg++;                  /* skip leading '-' */
       if (set_special_option(arg, option_source))
               return;

       for (p = pro + array_length(pro); p-- != pro;) {
               arg_arg = skip_over(arg, p->p_may_negate, p->p_name);
               if (arg_arg != NULL)
                       goto found;
       }
       errx(1, "%s: unknown option \"-%s\"", option_source, arg);
found:

       if (p->p_is_bool) {
               if (arg_arg[0] != '\0')
                       errx(1, "%s: unknown option \"-%s\"",
                           option_source, arg);

               *(bool *)((unsigned char *)(void *)&opt + p->opt_offset) =
                   p->p_may_negate ? arg[0] != 'n' : p->p_bool_value;
               return;
       }

       char *end;
       long num = strtol(arg_arg, &end, 10);
       if (*end != '\0')
               errx(1, "%s: argument \"%s\" to option \"-%s\" "
                   "must be an integer",
                   option_source, arg_arg, p->p_name);

       if (!(ch_isdigit(*arg_arg) && p->i_min <= num && num <= p->i_max))
               errx(1,
                   "%s: argument \"%s\" to option \"-%s\" "
                   "must be between %d and %d",
                   option_source, arg_arg, p->p_name, p->i_min, p->i_max);

       *(int *)((unsigned char *)(void *)&opt + p->opt_offset) = (int)num;
}

static void
load_profile(const char *fname, bool must_exist)
{
       FILE *f;

       if ((f = fopen(fname, "r")) == NULL) {
               if (must_exist)
                       err(EXIT_FAILURE, "profile %s", fname);
               return;
       }

       for (;;) {
               char buf[BUFSIZ];
               size_t n = 0;
               int ch, comment_ch = -1;

               while ((ch = getc(f)) != EOF) {
                       if (ch == '*' && comment_ch == -1
                           && n > 0 && buf[n - 1] == '/') {
                               n--;
                               comment_ch = '*';
                       } else if (comment_ch != -1) {
                               comment_ch = ch == '/' && comment_ch == '*'
                                   ? -1 : ch;
                       } else if (ch_isspace((char)ch)) {
                               break;
                       } else if (n >= array_length(buf) - 2) {
                               errx(1, "buffer overflow in %s, "
                                   "starting with '%.10s'",
                                   fname, buf);
                       } else
                               buf[n++] = (char)ch;
               }

               if (n > 0) {
                       buf[n] = '\0';
                       if (opt.verbose)
                               (void)fprintf(stderr, "profile: %s\n", buf);
                       if (buf[0] != '-')
                               errx(1,
                                   "%s: option \"%s\" must start with '-'",
                                   fname, buf);
                       set_option(buf, fname);
               }
               if (ch == EOF)
                       break;
       }
       (void)fclose(f);
}

void
load_profile_files(const char *path)
{
       if (path != NULL)
               load_profile(path, true);
       else {
               const char *home = getenv("HOME");
               if (home != NULL) {
                       char fname[PATH_MAX];
                       snprintf(fname, sizeof(fname), "%s/.indent.pro", home);
                       load_profile(fname, false);
               }
       }
       load_profile(".indent.pro", false);
}

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