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desc.c

/* desc.c - variable/command description handling for upsd

   Copyright (C) 2003  Russell Kroll <rkroll@exploits.org>

   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
*/

#include <string.h>

#include "common.h"
#include "parseconf.h"

#include "desc.h"

extern const char *datapath;

struct dlist_t {
      char  *name;
      char  *desc;
      struct      dlist_t     *next;
};

      static      struct      dlist_t     *cmd_list = NULL, *var_list = NULL;

static void list_free(struct dlist_t *ptr)
{
      struct      dlist_t     *next;

      while (ptr) {
            next = ptr->next;

            free(ptr->name);
            free(ptr->desc);
            free(ptr);

            ptr = next;
      }
}

static const char *list_get(const struct dlist_t *list, const char *name)
{
      const struct      dlist_t     *tmp;

      tmp = list;

      while (tmp) {
            if (!strcasecmp(tmp->name, name))
                  return tmp->desc;

            tmp = tmp->next;
      }

      return NULL;
}

static void desc_add(struct dlist_t **list, const char *name, const char *desc)
{
      struct      dlist_t     *tmp, *last;

      tmp = last = *list;

      while (tmp) {
            last = tmp;

            /* replace duplicates */
            if (!strcasecmp(tmp->name, name)) {
                  free(tmp->desc);
                  tmp->desc = xstrdup(desc);
                  return;
            }

            tmp = tmp->next;
      }

      tmp = xmalloc(sizeof(struct dlist_t));

      tmp->name = xstrdup(name);
      tmp->desc = xstrdup(desc);
      tmp->next = NULL;

      if (last)
            last->next = tmp;
      else
            *list = tmp;
}

static void desc_file_err(const char *errmsg)
{
      upslogx(LOG_ERR, "Fatal error in parseconf (cmdvartab): %s", errmsg);
}

/* interface */

void desc_load(void)
{
      char  fn[SMALLBUF];
      PCONF_CTX_t ctx;

      snprintf(fn, sizeof(fn), "%s/cmdvartab", datapath);

      pconf_init(&ctx, desc_file_err);

      /* this file is not required */
      if (!pconf_file_begin(&ctx, fn)) {
            upslogx(LOG_INFO, "%s not found - disabling descriptions", fn);
            pconf_finish(&ctx);
            return;
      }

      while (pconf_file_next(&ctx)) {
            if (pconf_parse_error(&ctx)) {
                  upslogx(LOG_ERR, "Parse error: %s:%d: %s",
                        fn, ctx.linenum, ctx.errmsg);

                  continue;
            }
                  
            if (ctx.numargs < 3)
                  continue;

            if (!strcmp(ctx.arglist[0], "CMDDESC")) {
                  desc_add(&cmd_list, ctx.arglist[1], ctx.arglist[2]);
                  continue;
            }

            if (!strcmp(ctx.arglist[0], "VARDESC")) {
                  desc_add(&var_list, ctx.arglist[1], ctx.arglist[2]);
                  continue;
            }

            /* unknown */
      }

      pconf_finish(&ctx);
}

void desc_free(void)
{
      list_free(cmd_list);
      list_free(var_list);

      cmd_list = var_list = NULL;
}

const char *desc_get_cmd(const char *name)
{
      return list_get(cmd_list, name);
}

const char *desc_get_var(const char *name)
{
      return list_get(var_list, name);
}

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