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path: root/libmu_scm/mu_body.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.

   GNU Mailutils 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, or (at your option)
   any later version.

   GNU Mailutils 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 GNU Mailutils; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "mu_scm.h"

long body_tag;

struct mu_body
{
  body_t body;             /* Message body */
  stream_t stream;         /* Associated stream */
  int offset;              /* Current offset in the stream */
  char *buffer;            /* I/O buffer */
  int bufsize;             /* Size of allocated buffer */
  SCM msg;                 /* Message the body belongs to */		
};

/* Initial buffer size */
#define BUF_SIZE 64

/* SMOB functions: */
static SCM
mu_scm_body_mark (SCM body_smob)
{
  struct mu_body *mbp = (struct mu_body *) SCM_CDR (body_smob);
  return mbp->msg;
}

static scm_sizet
mu_scm_body_free (SCM body_smob)
{
  struct mu_body *mbp = (struct mu_body *) SCM_CDR (body_smob);
  if (mbp->buffer)
    free (mbp->buffer);
  free (mbp);
  return sizeof (struct mu_body);
}

static int
mu_scm_body_print (SCM body_smob, SCM port, scm_print_state * pstate)
{
  struct mu_body *mbp = (struct mu_body *) SCM_CDR (body_smob);
  size_t b_size = 0, b_lines = 0, len = 0;
  char buffer[512];

  body_size (mbp->body, &b_size);
  body_lines (mbp->body, &b_lines);
  buffer[0] = 0;
  body_get_filename (mbp->body, buffer, sizeof (buffer), &len);

  scm_puts ("#<body \"", port);
  scm_puts (buffer, port);
  scm_puts ("\" ", port);

  snprintf (buffer, sizeof (buffer), "%3lu %-5lu",
	    (unsigned long) b_lines, (unsigned long) b_size);
  scm_puts (buffer, port);

  scm_puts (">", port);
  return 1;
}

/* Internal functions: */

int
mu_scm_is_body (SCM scm)
{
  return SCM_NIMP (scm) && SCM_CAR (scm) == body_tag;
}

SCM
mu_scm_body_create (SCM msg, body_t body)
{
  struct mu_body *mbp;

  mbp = scm_must_malloc (sizeof (struct mu_body), "body");
  mbp->msg = msg;
  mbp->body = body;
  mbp->stream = NULL;
  mbp->offset = 0;
  mbp->buffer = NULL;
  mbp->bufsize = 0;
  SCM_RETURN_NEWSMOB (body_tag, mbp);
}

/* ************************************************************************* */
/* Guile primitives */

SCM_DEFINE (mu_body_read_line, "mu-body-read-line", 1, 0, 0,
	    (SCM BODY), 
	    "Read next line from the BODY.")
#define FUNC_NAME s_mu_body_read_line
{
  struct mu_body *mbp;
  int n, nread;

  SCM_ASSERT (mu_scm_is_body (BODY), BODY, SCM_ARG1, FUNC_NAME);
  mbp = (struct mu_body *) SCM_CDR (BODY);

  if (!mbp->stream)
    {
      if (body_get_stream (mbp->body, &mbp->stream))
	return SCM_BOOL_F;
    }

  if (!mbp->buffer)
    {
      mbp->bufsize = BUF_SIZE;
      mbp->buffer = malloc (mbp->bufsize);
      if (!mbp->buffer)
	return SCM_BOOL_F;
    }

  nread = 0;
  while (1)
    {
      if (stream_readline (mbp->stream, mbp->buffer + nread,
			   mbp->bufsize - nread,
			   mbp->offset, &n))
	return SCM_BOOL_F;
      if (n == 0)
	break;
      nread += n;
      mbp->offset += n;
      if (mbp->buffer[n - 1] != '\n' && n == mbp->bufsize)
	{
	  char *p = realloc (mbp->buffer, mbp->bufsize + BUF_SIZE);
	  if (!p)
	    break;
	  mbp->buffer = p;
	  mbp->bufsize += BUF_SIZE;
	}
      else
	break;
    }

  if (nread == 0)
    return SCM_EOF_VAL;

  return scm_makfrom0str (mbp->buffer);
}
#undef FUNC_NAME

SCM_DEFINE (mu_body_write, "mu-body-write", 2, 0, 0,
	    (SCM BODY, SCM TEXT),
	    "Append TEXT to message BODY.")
#define FUNC_NAME s_mu_body_write
{
  char *ptr;
  size_t len, n;
  struct mu_body *mbp;

  SCM_ASSERT (mu_scm_is_body (BODY), BODY, SCM_ARG1, FUNC_NAME);
  mbp = (struct mu_body *) SCM_CDR (BODY);
  SCM_ASSERT (SCM_NIMP (TEXT) && SCM_STRINGP (TEXT),
	      TEXT, SCM_ARG2, FUNC_NAME);
  
  if (!mbp->stream)
    {
      if (body_get_stream (mbp->body, &mbp->stream))
	return SCM_BOOL_F;
    }

  ptr = SCM_STRING_CHARS (TEXT);
  len = strlen (ptr);
  if (stream_write (mbp->stream, ptr, len, mbp->offset, &n))
    {
      return SCM_BOOL_F;
    }
  mbp->offset += n;
  return SCM_BOOL_T;
}
#undef FUNC_NAME

/* Initialize the module */
void
mu_scm_body_init ()
{
  body_tag = scm_make_smob_type ("body", sizeof (struct mu_body));
  scm_set_smob_mark (body_tag, mu_scm_body_mark);
  scm_set_smob_free (body_tag, mu_scm_body_free);
  scm_set_smob_print (body_tag, mu_scm_body_print);

#include "mu_body.x"

}

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