/*	$NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos Exp $
 */

/*-
 * Copyright (c)2003 Citrus Project,
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos Exp $");
#endif /* LIBC_SCCS and not lint */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "citrus_namespace.h"
#include "citrus_region.h"
#include "citrus_memstream.h"
#include "citrus_bcs.h"

const char *
_citrus_memory_stream_getln(struct _citrus_memory_stream *__restrict ms,
                            size_t *__restrict rlen) {
  size_t i;
  const uint8_t *h, *p;
  size_t ret;

  if (ms->ms_pos >= _region_size(&ms->ms_region))
    return (NULL);

  h = p = (uint8_t *)_region_offset(&ms->ms_region, ms->ms_pos);
  ret = 0;
  for (i = _region_size(&ms->ms_region) - ms->ms_pos; i > 0; i--) {
    ret++;
    if (_bcs_iseol(*p))
      break;
    p++;
  }

  ms->ms_pos += ret;
  *rlen = ret;
  return ((const char *)h);
}

#define T_COMM '#'

const char *
_citrus_memory_stream_matchline(struct _citrus_memory_stream *__restrict ms,
                                const char *__restrict key,
                                size_t *__restrict rlen, int iscasesensitive) {
  const char *p, *q;
  size_t len, keylen;

  keylen = strlen(key);
  while (/*CONSTCOND*/ 1) {
    p = _citrus_memory_stream_getln(ms, &len);
    if (p == NULL)
      return (NULL);

    /* ignore comment */
    q = memchr(p, T_COMM, len);
    if (q) {
      len = q - p;
    }
    /* ignore trailing white space and newline */
    _bcs_trunc_rws_len(p, &len);
    if (len == 0)
      continue; /* ignore null line */

    /* skip white spaces at the head of the line */
    p = _bcs_skip_ws_len(p, &len);
    q = _bcs_skip_nonws_len(p, &len);

    if ((size_t)(q - p) == keylen) {
      if (iscasesensitive) {
        if (memcmp(key, p, keylen) == 0)
          break; /* match */
      } else {
        if (_bcs_strncasecmp(key, p, keylen) == 0)
          break; /* match */
      }
    }
  }

  p = _bcs_skip_ws_len(q, &len);
  *rlen = len;

  return (p);
}

void *_citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
                                struct _citrus_region *r, char ch) {
  void *head, *chr;
  size_t sz;

  if (ms->ms_pos >= _region_size(&ms->ms_region))
    return NULL;

  head = _region_offset(&ms->ms_region, ms->ms_pos);
  chr = memchr(head, ch, _memstream_remainder(ms));
  if (chr == NULL) {
    _region_init(r, head, _memstream_remainder(ms));
    ms->ms_pos = _region_size(&ms->ms_region);
    return NULL;
  }
  sz = (char *)chr - (char *)head;

  _region_init(r, head, sz);
  ms->ms_pos += sz + 1;

  return chr;
}

void _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *ms) {
  int ch;

  while ((ch = _memstream_peek(ms)) != EOF) {
    if (!_bcs_isspace(ch))
      break;
    _memstream_getc(ms);
  }
}
