/*
   * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation; either version 2 of the
   * License, or (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   *  General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
   *                                                                   USA
   */

  #define _GNU_SOURCE
  
  #include <stdio.h>

  #include "dtc.h"
  #include "srcpos.h"

  static char *dirname(const char *path)
  {
  	const char *slash = strrchr(path, '/');
  
  	if (slash) {
  		int len = slash - path;
  		char *dir = xmalloc(len + 1);
  
  		memcpy(dir, path, len);
  		dir[len] = '\0';
  		return dir;
  	}
  	return NULL;
  }
  
  struct srcfile_state *current_srcfile; /* = NULL */

  /* Detect infinite include recursion. */
  #define MAX_SRCFILE_DEPTH     (100)
  static int srcfile_depth; /* = 0 */
  
  FILE *srcfile_relative_open(const char *fname, char **fullnamep)

  {

  	FILE *f;

  	char *fullname;

  	if (streq(fname, "-")) {
  		f = stdin;
  		fullname = xstrdup("<stdin>");

  	} else {

  		if (!current_srcfile || !current_srcfile->dir
  		    || (fname[0] == '/'))
  			fullname = xstrdup(fname);
  		else
  			fullname = join_path(current_srcfile->dir, fname);
  
  		f = fopen(fullname, "r");
  		if (!f)
  			die("Couldn't open \"%s\": %s
  ", fname,
  			    strerror(errno));

  	}

  	if (fullnamep)
  		*fullnamep = fullname;
  	else

  		free(fullname);

  	return f;

  }

  void srcfile_push(const char *fname)
  {
  	struct srcfile_state *srcfile;
  
  	if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
  		die("Includes nested too deeply");
  
  	srcfile = xmalloc(sizeof(*srcfile));
  
  	srcfile->f = srcfile_relative_open(fname, &srcfile->name);
  	srcfile->dir = dirname(srcfile->name);
  	srcfile->prev = current_srcfile;
  
  	srcfile->lineno = 1;
  	srcfile->colno = 1;
  
  	current_srcfile = srcfile;
  }

  int srcfile_pop(void)

  {

  	struct srcfile_state *srcfile = current_srcfile;

  	assert(srcfile);

  	current_srcfile = srcfile->prev;

  	if (fclose(srcfile->f))
  		die("Error closing \"%s\": %s
  ", srcfile->name,
  		    strerror(errno));

  	/* FIXME: We allow the srcfile_state structure to leak,
  	 * because it could still be referenced from a location
  	 * variable being carried through the parser somewhere.  To
  	 * fix this we could either allocate all the files from a
  	 * table, or use a pool allocator. */

  	return current_srcfile ? 1 : 0;
  }

  /*
   * The empty source position.
   */

  struct srcpos srcpos_empty = {
  	.first_line = 0,
  	.first_column = 0,
  	.last_line = 0,
  	.last_column = 0,
  	.file = NULL,
  };

  #define TAB_SIZE      8

  void srcpos_update(struct srcpos *pos, const char *text, int len)
  {
  	int i;
  
  	pos->file = current_srcfile;
  
  	pos->first_line = current_srcfile->lineno;
  	pos->first_column = current_srcfile->colno;
  
  	for (i = 0; i < len; i++)
  		if (text[i] == '
  ') {
  			current_srcfile->lineno++;
  			current_srcfile->colno = 1;
  		} else if (text[i] == '\t') {
  			current_srcfile->colno =
  				ALIGN(current_srcfile->colno, TAB_SIZE);
  		} else {
  			current_srcfile->colno++;
  		}
  
  	pos->last_line = current_srcfile->lineno;
  	pos->last_column = current_srcfile->colno;
  }

  struct srcpos *
  srcpos_copy(struct srcpos *pos)
  {
  	struct srcpos *pos_new;

  	pos_new = xmalloc(sizeof(struct srcpos));
  	memcpy(pos_new, pos, sizeof(struct srcpos));
  
  	return pos_new;
  }
  
  
  
  void
  srcpos_dump(struct srcpos *pos)
  {
  	printf("file        : \"%s\"
  ",
  	       pos->file ? (char *) pos->file : "<no file>");
  	printf("first_line  : %d
  ", pos->first_line);
  	printf("first_column: %d
  ", pos->first_column);
  	printf("last_line   : %d
  ", pos->last_line);
  	printf("last_column : %d
  ", pos->last_column);
  	printf("file        : %s
  ", pos->file->name);
  }

  
  char *
  srcpos_string(struct srcpos *pos)
  {
  	const char *fname = "<no-file>";
  	char *pos_str;
  	int rc;
  
  	if (pos)
  		fname = pos->file->name;
  
  
  	if (pos->first_line != pos->last_line)
  		rc = asprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
  			      pos->first_line, pos->first_column,
  			      pos->last_line, pos->last_column);
  	else if (pos->first_column != pos->last_column)
  		rc = asprintf(&pos_str, "%s:%d.%d-%d", fname,
  			      pos->first_line, pos->first_column,
  			      pos->last_column);
  	else
  		rc = asprintf(&pos_str, "%s:%d.%d", fname,
  			      pos->first_line, pos->first_column);
  
  	if (rc == -1)
  		die("Couldn't allocate in srcpos string");
  
  	return pos_str;
  }
  
  void
  srcpos_verror(struct srcpos *pos, char const *fmt, va_list va)
  {
         const char *srcstr;
  
         srcstr = srcpos_string(pos);
  
         fprintf(stdout, "Error: %s ", srcstr);
         vfprintf(stdout, fmt, va);
         fprintf(stdout, "
  ");

  }

  void
  srcpos_error(struct srcpos *pos, char const *fmt, ...)

  {

  	va_list va;
  
  	va_start(va, fmt);
  	srcpos_verror(pos, fmt, va);
  	va_end(va);
  }
  
  
  void
  srcpos_warn(struct srcpos *pos, char const *fmt, ...)
  {
  	const char *srcstr;
  	va_list va;
  	va_start(va, fmt);
  
  	srcstr = srcpos_string(pos);
  
  	fprintf(stderr, "Warning: %s ", srcstr);
  	vfprintf(stderr, fmt, va);
  	fprintf(stderr, "
  ");

  	va_end(va);

  }