f2b/src/backends/backend.c

/* Copyright 2016 Alex 'AdUser' Z (ad_user@runbox.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

typedef struct cfg_id_t {
  struct cfg_id_t *next;
  char name[ID_MAX + 1];
  size_t count;
} cfg_id_t;

/* this list needed for tracking backend usage with `shared = yes` */
cfg_id_t *ids_usage = NULL;

static size_t
usage_inc(const char *id) {
  cfg_id_t *e = NULL;

  assert(id != NULL);

  for (e = ids_usage; e != NULL; e = e->next) {
    if (strcmp(e->name, id) != 0)
      continue;
    /* found */
    e->count++;
    return e->count;
  }
  /* not found or list is empty */
  e = calloc(1, sizeof(cfg_id_t));
  strlcpy(e->name, id, sizeof(e->name));
  e->count++;
  e->next = ids_usage;
  ids_usage = e;
  return e->count;
}

static size_t
usage_dec(const char *id) {
  cfg_id_t *e = NULL;

  assert(id != NULL);

  for (e = ids_usage; e != NULL; e = e->next) {
    if (strcmp(e->name, id) != 0)
      continue;
    /* found */
    if (e->count > 0)
      e->count--;
    return e->count;
  }

  /* not found or list is empty */
  return 0;
}

static void
logcb_stub(enum loglevel lvl, const char *str) {
  assert(str != NULL);
  (void)(lvl);
  (void)(str);
}

__attribute__ ((format (printf, 3, 4)))
static void
log_msg(const cfg_t *cfg, enum loglevel lvl, const char *format, ...) {
  char buf[4096] = "";
  va_list args;
  size_t len;

  len = snprintf(buf, sizeof(buf), "backend/%s: ", MODNAME);
  va_start(args, format);
  vsnprintf(buf + len, sizeof(buf) - len, format, args);
  va_end(args);

  cfg->logcb(lvl, buf);
}

void
logcb(cfg_t *cfg, void (*cb)(enum loglevel lvl, const char *msg)) {
  assert(cfg != NULL);
  assert(cb  != NULL);

  cfg->logcb = cb;
}

int
state(cfg_t *cfg) {
  assert(cfg != NULL);
  return cfg->flags;
}