/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David A. Holland.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "utils.h"
#include "array.h"
#include "place.h"

struct placefile {
       struct place includedfrom;
       char *dir;
       char *name;
       int depth;
       bool fromsystemdir;
};
DECLARRAY(placefile, static UNUSED);
DEFARRAY(placefile, static);

static struct placefilearray placefiles;
static bool overall_failure;

static const char *myprogname;

static FILE *debuglogfile;

////////////////////////////////////////////////////////////
// placefiles

static
struct placefile *
placefile_create(const struct place *from, const char *name,
                bool fromsystemdir)
{
       struct placefile *pf;
       const char *s;
       size_t len;

       pf = domalloc(sizeof(*pf));
       pf->includedfrom = *from;

       s = strrchr(name, '/');
       len = (s == NULL) ? 0 : s - name;
       pf->dir = dostrndup(name, len);

       pf->name = dostrdup(name);
       pf->fromsystemdir = fromsystemdir;

       if (from->file != NULL) {
               pf->depth = from->file->depth + 1;
       } else {
               pf->depth = 1;
       }
       return pf;
}

static
void
placefile_destroy(struct placefile *pf)
{
       dostrfree(pf->name);
       dofree(pf, sizeof(*pf));
}

DESTROYALL_ARRAY(placefile, );

const char *
place_getparsedir(const struct place *place)
{
       if (place->file == NULL) {
               return ".";
       }
       return place->file->dir;
}

static
struct placefile *
placefile_find(const struct place *incfrom, const char *name)
{
       unsigned i, num;
       struct placefile *pf;

       num = placefilearray_num(&placefiles);
       for (i=0; i<num; i++) {
               pf = placefilearray_get(&placefiles, i);
               if (place_eq(incfrom, &pf->includedfrom) &&
                   !strcmp(name, pf->name)) {
                       return pf;
               }
       }
       return NULL;
}

void
place_changefile(struct place *p, const char *name)
{
       struct placefile *pf;

       assert(p->type == P_FILE);
       if (!strcmp(name, p->file->name)) {
               return;
       }
       pf = placefile_find(&p->file->includedfrom, name);
       if (pf == NULL) {
               pf = placefile_create(&p->file->includedfrom, name,
                                     p->file->fromsystemdir);
               placefilearray_add(&placefiles, pf, NULL);
       }
       p->file = pf;
}

const struct placefile *
place_addfile(const struct place *place, const char *file, bool issystem)
{
       struct placefile *pf;

       pf = placefile_create(place, file, issystem);
       placefilearray_add(&placefiles, pf, NULL);
       if (pf->depth > 120) {
               complain(place, "Maximum include nesting depth exceeded");
               die();
       }
       return pf;
}

////////////////////////////////////////////////////////////
// places

void
place_setnowhere(struct place *p)
{
       p->type = P_NOWHERE;
       p->file = NULL;
       p->line = 0;
       p->column = 0;
}

void
place_setbuiltin(struct place *p, unsigned num)
{
       p->type = P_BUILTIN;
       p->file = NULL;
       p->line = num;
       p->column = 1;
}

void
place_setcommandline(struct place *p, unsigned line, unsigned column)
{
       p->type = P_COMMANDLINE;
       p->file = NULL;
       p->line = line;
       p->column = column;
}

void
place_setfilestart(struct place *p, const struct placefile *pf)
{
       p->type = P_FILE;
       p->file = pf;
       p->line = 1;
       p->column = 1;
}

void
place_addcolumns(struct place *p, unsigned cols)
{
       unsigned newcol;

       newcol = p->column + cols;
       if (newcol < p->column) {
               /* overflow (use the old place to complain) */
               complain(p, "Column numbering overflow");
               die();
       }
       p->column = newcol;
}

void
place_addlines(struct place *p, unsigned lines)
{
       unsigned nextline;

       nextline = p->line + lines;
       if (nextline < p->line) {
               /* overflow (use the old place to complain) */
               complain(p, "Line numbering overflow");
               die();
       }
       p->line = nextline;
}

const char *
place_getname(const struct place *p)
{
       switch (p->type) {
           case P_NOWHERE: return "<nowhere>";
           case P_BUILTIN: return "<built-in>";
           case P_COMMANDLINE: return "<command-line>";
           case P_FILE: return p->file->name;
       }
       assert(0);
       return NULL;
}

bool
place_samefile(const struct place *a, const struct place *b)
{
       if (a->type != b->type) {
               return false;
       }
       if (a->file != b->file) {
               return false;
       }
       return true;
}

bool
place_eq(const struct place *a, const struct place *b)
{
       if (!place_samefile(a, b)) {
               return false;
       }
       if (a->line != b->line || a->column != b->column) {
               return false;
       }
       return true;
}

static
void
place_printfrom(const struct place *p)
{
       const struct place *from;

       if (p->file == NULL) {
               return;
       }
       from = &p->file->includedfrom;
       if (from->type != P_NOWHERE) {
               place_printfrom(from);
               fprintf(stderr, "In file included from %s:%u:%u:\n",
                       place_getname(from), from->line, from->column);
       }
}

////////////////////////////////////////////////////////////
// complaints

void
complain_init(const char *pn)
{
       myprogname = pn;
}

void
complain(const struct place *p, const char *fmt, ...)
{
       va_list ap;

       if (p != NULL) {
               place_printfrom(p);
               fprintf(stderr, "%s:%u:%u: ", place_getname(p),
                       p->line, p->column);
       } else {
               fprintf(stderr, "%s: ", myprogname);
       }
       va_start(ap, fmt);
       vfprintf(stderr, fmt, ap);
       va_end(ap);
       fprintf(stderr, "\n");
}

void
complain_fail(void)
{
       overall_failure = true;
}

bool
complain_failed(void)
{
       return overall_failure;
}

////////////////////////////////////////////////////////////
// debug logging

void
debuglog_open(const struct place *p, /*const*/ char *file)
{
       assert(debuglogfile == NULL);
       debuglogfile = fopen(file, "w");
       if (debuglogfile == NULL) {
               complain(p, "%s: %s", file, strerror(errno));
               die();
       }
}

void
debuglog_close(void)
{
       if (debuglogfile != NULL) {
               fclose(debuglogfile);
               debuglogfile = NULL;
       }
}

PF(2, 3) void
debuglog(const struct place *p, const char *fmt, ...)
{
       va_list ap;

       if (debuglogfile == NULL) {
               return;
       }

       fprintf(debuglogfile, "%s:%u: ", place_getname(p), p->line);
       va_start(ap, fmt);
       vfprintf(debuglogfile, fmt, ap);
       va_end(ap);
       fprintf(debuglogfile, "\n");
       fflush(debuglogfile);
}

PF(3, 4) void
debuglog2(const struct place *p, const struct place *p2, const char *fmt, ...)
{
       va_list ap;

       if (debuglogfile == NULL) {
               return;
       }

       fprintf(debuglogfile, "%s:%u: ", place_getname(p), p->line);
       if (place_samefile(p, p2)) {
               fprintf(debuglogfile, "(block began at line %u) ",
                       p2->line);
       } else {
               fprintf(debuglogfile, "(block began at %s:%u)",
                       place_getname(p2), p2->line);
       }
       va_start(ap, fmt);
       vfprintf(debuglogfile, fmt, ap);
       va_end(ap);
       fprintf(debuglogfile, "\n");
       fflush(debuglogfile);
}

////////////////////////////////////////////////////////////
// module init and cleanup

void
place_init(void)
{
       placefilearray_init(&placefiles);
}

void
place_cleanup(void)
{
       placefilearray_destroyall(&placefiles);
       placefilearray_cleanup(&placefiles);
}

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