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/* This file is part of fileserv.
   Copyright (C) 2017, 2019 Sergey Poznyakoff

   Fileserv 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 3, or (at your option)
   any later version.

   Fileserv 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 fileserv.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include "mtint.h"

ssize_t
mimetypes_error_format (char **pbuf, size_t *psize,
			struct locus_range const *lr, char const *fmt,
			va_list ap)
{
  char *buf;
  size_t buflen;
  ssize_t n;
  int rc = 0;
  
  if (lr)
    {
      n = locus_range_format (pbuf, psize, lr);
      if (n == -1)
	return -1;
      buf = *pbuf;
      buflen = *psize;
    }
  else
    {
      buf = *pbuf;
      buflen = *psize;
      if (buflen == 0)
	buflen = 512; /* Initial allocation */

      buf = calloc (1, buflen);
      if (buf == NULL)
	{
	  errno = ENOMEM;
	  return -1;
	}
    }
  
  for (;;)
    {
      va_list aq;

      va_copy(aq, ap);
      n = vsnprintf (buf, buflen, fmt, aq);
      va_end(aq);

      if (n < 0 || n >= buflen || !memchr (buf, '\0', n + 1))
	{
	  char *newbuf;
	  size_t newlen = buflen * 2;
	  if (newlen < buflen)
	    {
	      errno = ENOMEM;
	      rc = -1;
	      break;
	    }
	  newbuf = realloc (buf, newlen);
	  if (newbuf == NULL)
	    {
	      errno = ENOMEM;
	      rc = -1;
	      break;
	    }
	  buflen = newlen;
	  buf = newbuf;
	}
      else
	break;
    }
  
  if (rc)
    {
      if (!*pbuf)
	{
	  /* We made first allocation, now free it */
	  free (buf);
	  buf = NULL;
	  buflen = 0;
	}
    }

  *pbuf = buf;
  *psize = buflen;
  return rc;
}


static void
default_error_printer (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
}

void (*mimetypes_error_printer) (char const *) = default_error_printer;

void
mimetypes_error_at (struct locus_range const *lr, char const *fmt, ...)
{
  va_list ap;
  char *buf = NULL;
  size_t buflen = 0;
  ssize_t n;
  
  va_start (ap, fmt);
  n = mimetypes_error_format (&buf, &buflen, lr, fmt, ap);
  va_end (ap);

  if (n < 0)
    return;

  mimetypes_error_printer (buf);
  
  free (buf);
}

void
mimetypes_error (char const *fmt, ...)
{
  va_list ap;
  char *buf = NULL;
  size_t buflen = 0;
  ssize_t n;
  
  va_start (ap, fmt);
  n = mimetypes_error_format (&buf, &buflen, NULL, fmt, ap);
  va_end (ap);

  if (n < 0)
    return;

  mimetypes_error_printer (buf);
  
  free (buf);
}

void
print_locus_range (FILE *fp, struct locus_range const *lr)
{
  char *buf = NULL;
  size_t buflen = 0;
  ssize_t n;
  n = locus_range_format (&buf, &buflen, lr);
  if (n < 0)
    return;
  fwrite (buf, n, 1, fp);
  free (buf);
}

void
mimetypes_nomem (void)
{
  mimetypes_error_printer ("out of memory");
  abort ();
}

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