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deliver-remove-header.c

/* $Id: deliver-remove-header.c,v 1.11 2007/03/28 19:59:57 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <string.h>

#include "fdm.h"
#include "deliver.h"

int    deliver_remove_header_deliver(struct deliver_ctx *, struct actitem *);
void   deliver_remove_header_desc(struct actitem *, char *, size_t);

struct deliver deliver_remove_header = {
      "remove-header",
      DELIVER_INCHILD,
      deliver_remove_header_deliver,
      deliver_remove_header_desc
};

int
deliver_remove_header_deliver(struct deliver_ctx *dctx, struct actitem *ti)
{
      struct account                      *a = dctx->account;
      struct mail                   *m = dctx->mail;
      struct deliver_remove_header_data   *data = ti->data;
      char                          *ptr, *hdr;
      size_t                               len, off, wrap;
      u_int                          i;

      hdr = replacestr(&data->hdr, m->tags, m, &m->rml);
      if (hdr == NULL || *hdr == '\0') {
            if (hdr != NULL)
                  xfree(hdr);
            log_warnx("%s: empty header", a->name);
            return (DELIVER_FAILURE);
      }
      log_debug2("%s: removing header: %s", a->name, hdr);

      ARRAY_FREE(&m->wrapped);
      m->wrapchar = '\0';
      fill_wrapped(m);

      set_wrapped(m, ' ');

      while ((ptr = find_header(m, hdr, &len, 0)) != NULL) {
            log_debug3("%s: found header to remove: %.*s", a->name,
                (int) len, ptr);

            /* include the \n */
            len++;

            /* remove the header */
            memmove(ptr, ptr + len, m->size - len - (ptr - m->data));
            m->size -= len;
            if (m->body != -1)
                  m->body -= len;

            /* fix up the wrapped array */
            off = ptr - m->data;
            i = 0;
            while (i < ARRAY_LENGTH(&m->wrapped)) {
                  wrap = ARRAY_ITEM(&m->wrapped, i, size_t);
                  if (wrap >= off + len) {
                        ARRAY_SET(&m->wrapped, i, wrap - len, size_t);
                        i++;
                  } else if (wrap >= off)
                        ARRAY_REMOVE(&m->wrapped, i, size_t);
                  else
                        i++;
            }
      }

      /* invalidate the match data since stuff may have moved */
      m->rml.valid = 0;

      set_wrapped(m, '\n');
      return (DELIVER_SUCCESS);
}

void
deliver_remove_header_desc(struct actitem *ti, char *buf, size_t len)
{
      struct deliver_remove_header_data   *data = ti->data;

      xsnprintf(buf, len, "remove-header \"%s\"", data->hdr.str);
}

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