C++ ds_cstr函数代码示例

static int
parse_actions(void)
{
    struct ds in;

    ds_init(&in);
    vlog_set_levels_from_string_assert("odp_util:console:dbg");
    while (!ds_get_test_line(&in, stdin)) {
        struct ofpbuf odp_actions;
        struct ds out;
        int error;

        /* Convert string to OVS DP actions. */
        ofpbuf_init(&odp_actions, 0);
        error = odp_actions_from_string(ds_cstr(&in), NULL, &odp_actions);
        if (error) {
            printf("odp_actions_from_string: error\n");
            goto next;
        }

        /* Convert odp_actions back to string. */
        ds_init(&out);
        format_odp_actions(&out, odp_actions.data, odp_actions.size);
        puts(ds_cstr(&out));
        ds_destroy(&out);

    next:
        ofpbuf_uninit(&odp_actions);
    }
    ds_destroy(&in);

    return 0;
}

int
main(void)
{
    struct ds in;

    ds_init(&in);
    while (!ds_get_line(&in, stdin)) {
        struct ofpbuf odp_key;
        struct flow flow;
        struct ds out;
        int error;
        char *s;

        /* Delete comments, skip blank lines. */
        s = ds_cstr(&in);
        if (*s == '#') {
            puts(s);
            continue;
        }
        if (strchr(s, '#')) {
            *strchr(s, '#') = '\0';
        }
        if (s[strspn(s, " ")] == '\0') {
            putchar('\n');
            continue;
        }

        /* Convert string to OVS DP key. */
        ofpbuf_init(&odp_key, 0);
        error = odp_flow_key_from_string(ds_cstr(&in), &odp_key);
        if (error) {
            printf("odp_flow_key_from_string: error\n");
            goto next;
        }

        /* Convert odp_key to flow. */
        error = odp_flow_key_to_flow(odp_key.data, odp_key.size, &flow);
        if (error) {
            printf("odp_flow_key_to_flow: error\n");
            goto next;
        }

        /* Convert cls_rule back to odp_key. */
        ofpbuf_uninit(&odp_key);
        ofpbuf_init(&odp_key, 0);
        odp_flow_key_from_flow(&odp_key, &flow);

        /* Convert odp_key to string. */
        ds_init(&out);
        odp_flow_key_format(odp_key.data, odp_key.size, &out);
        puts(ds_cstr(&out));
        ds_destroy(&out);

    next:
        ofpbuf_uninit(&odp_key);
    }
    ds_destroy(&in);

    return 0;
}

static void IntrospectArguments(adbus_Member* m, d_String* out)
{
    size_t argi = 0;
    const char* arg = ds_cstr(&m->argsig);
    while (arg && *arg) {
        const char* next = adbus_nextarg(arg);
        ds_cat(out, "\t\t\t<arg type=\"");
        ds_cat_n(out, arg, next - arg);
        if (argi < dv_size(&m->arguments)) {
            ds_cat(out, "\" name=\"");
            ds_cat(out, dv_a(&m->arguments, argi));
        }
        ds_cat(out, "\"/>\n");
        arg = next;
        argi++;
    }
    assert(argi >= dv_size(&m->arguments)); 

    argi = 0;
    arg = ds_cstr(&m->retsig);
    while (arg && *arg) {
        const char* next = adbus_nextarg(arg);
        ds_cat(out, "\t\t\t<arg type=\"");
        ds_cat_n(out, arg, next - arg);
        if (argi < dv_size(&m->returns)) {
            ds_cat(out, "\" name=\"");
            ds_cat(out, dv_a(&m->returns, argi));
        }
        ds_cat(out, "\" direction=\"out\"/>\n");
        arg = next;
        argi++;
    }
    assert(argi >= dv_size(&m->returns)); 
 
}

static void
test_lex(const char *input)
{
    struct ds output;

    ds_init(&output);
    struct lexer lexer;

    lexer_init(&lexer, input);
    ds_clear(&output);
    while (lexer_get(&lexer) != LEX_T_END) {
        size_t len = output.length;
        lex_token_format(&lexer.token, &output);

        /* Check that the formatted version can really be parsed back
         * losslessly. */
        if (lexer.token.type != LEX_T_ERROR) {
            const char *s = ds_cstr(&output) + len;
            struct lexer l2;

            lexer_init(&l2, s);
            lexer_get(&l2);
            compare_token(&lexer.token, &l2.token);
            lexer_destroy(&l2);
        }
        ds_put_char(&output, ' ');
    }
    lexer_destroy(&lexer);

    ds_chomp(&output, ' ');
    puts(ds_cstr(&output));
    ds_destroy(&output);
}

/* Parse all the labels for the VAR_CNT variables in VARS and add
   the specified labels to those variables.  */
static int
get_label (struct lexer *lexer, struct variable **vars, size_t var_cnt,
           const char *dict_encoding)
{
  /* Parse all the labels and add them to the variables. */
  do
    {
      enum { MAX_LABEL_LEN = 255 };
      int width = var_get_width (vars[0]);
      union value value;
      struct string label;
      size_t trunc_len;
      size_t i;

      /* Set value. */
      value_init (&value, width);
      if (!parse_value (lexer, &value, vars[0]))
        {
          value_destroy (&value, width);
          return 0;
        }
      lex_match (lexer, T_COMMA);

      /* Set label. */
      if (lex_token (lexer) != T_ID && !lex_force_string (lexer))
        {
          value_destroy (&value, width);
          return 0;
        }

      ds_init_substring (&label, lex_tokss (lexer));

      trunc_len = utf8_encoding_trunc_len (ds_cstr (&label), dict_encoding,
                                           MAX_LABEL_LEN);
      if (ds_length (&label) > trunc_len)
	{
	  msg (SW, _("Truncating value label to %d bytes."), MAX_LABEL_LEN);
	  ds_truncate (&label, trunc_len);
	}

      for (i = 0; i < var_cnt; i++)
        var_replace_value_label (vars[i], &value, ds_cstr (&label));

      ds_destroy (&label);
      value_destroy (&value, width);

      lex_get (lexer);
      lex_match (lexer, T_COMMA);
    }
  while (lex_token (lexer) != T_SLASH && lex_token (lexer) != T_ENDCMD);

  return 1;
}

char *
process_escape_args(char **argv)
{
    struct ds ds = DS_EMPTY_INITIALIZER;
    char **argp;
    for (argp = argv; *argp; argp++) {
        const char *arg = *argp;
        const char *p;
        if (argp != argv) {
            ds_put_char(&ds, ' ');
        }
        if (arg[strcspn(arg, " \t\r\n\v\\\'\"")]) {
            ds_put_char(&ds, '"');
            for (p = arg; *p; p++) {
                if (*p == '\\' || *p == '\"') {
                    ds_put_char(&ds, '\\');
                }
                ds_put_char(&ds, *p);
            }
            ds_put_char(&ds, '"');
        } else {
            ds_put_cstr(&ds, arg);
        }
    }
    return ds_cstr(&ds);
}

/* Given 'status', which is a process status in the form reported by waitpid(2)
 * and returned by process_status(), returns a string describing how the
 * process terminated.  The caller is responsible for freeing the string when
 * it is no longer needed. */
char *
process_status_msg(int status)
{
    struct ds ds = DS_EMPTY_INITIALIZER;
    if (WIFEXITED(status)) {
        ds_put_format(&ds, "exit status %d", WEXITSTATUS(status));
    } else if (WIFSIGNALED(status) || WIFSTOPPED(status)) {
        int signr = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status);
        const char *name = NULL;
#ifdef HAVE_STRSIGNAL
        name = strsignal(signr);
#endif
        ds_put_format(&ds, "%s by signal %d",
                      WIFSIGNALED(status) ? "killed" : "stopped", signr);
        if (name) {
            ds_put_format(&ds, " (%s)", name);
        }
    } else {
        ds_put_format(&ds, "terminated abnormally (%x)", status);
    }
    if (WCOREDUMP(status)) {
        ds_put_cstr(&ds, ", core dumped");
    }
    return ds_cstr(&ds);
}

/* Given 'status', which is a process status in the form reported by waitpid(2)
 * and returned by process_status(), returns a string describing how the
 * process terminated.  The caller is responsible for freeing the string when
 * it is no longer needed. */
char *
process_status_msg(int status)
{
    struct ds ds = DS_EMPTY_INITIALIZER;
#ifndef _WIN32
    if (WIFEXITED(status)) {
        ds_put_format(&ds, "exit status %d", WEXITSTATUS(status));
    } else if (WIFSIGNALED(status)) {
        char namebuf[SIGNAL_NAME_BUFSIZE];

        ds_put_format(&ds, "killed (%s)",
                      signal_name(WTERMSIG(status), namebuf, sizeof namebuf));
    } else if (WIFSTOPPED(status)) {
        char namebuf[SIGNAL_NAME_BUFSIZE];

        ds_put_format(&ds, "stopped (%s)",
                      signal_name(WSTOPSIG(status), namebuf, sizeof namebuf));
    } else {
        ds_put_format(&ds, "terminated abnormally (%x)", status);
    }
    if (WCOREDUMP(status)) {
        ds_put_cstr(&ds, ", core dumped");
    }
#else
    ds_put_cstr(&ds, "function not supported.");
#endif
    return ds_cstr(&ds);
}

char *
flow_to_string(const struct flow *flow)
{
    struct ds ds = DS_EMPTY_INITIALIZER;
    flow_format(&ds, flow);
    return ds_cstr(&ds);
}

struct flow_table *
flow_table_create(struct datapath *dp, uint8_t table_id) {
    struct flow_table *table;
    struct ds string = DS_EMPTY_INITIALIZER;

    ds_put_format(&string, "table_%u", table_id);

    table = xmalloc(sizeof(struct flow_table));
    table->dp = dp;

    table->stats = xmalloc(sizeof(struct ofl_table_stats));
    table->stats->table_id      = table_id;
    table->stats->name          = ds_cstr(&string);
    table->stats->match         = DP_SUPPORTED_MATCH_FIELDS;
    table->stats->instructions  = DP_SUPPORTED_INSTRUCTIONS;
    table->stats->write_actions = DP_SUPPORTED_ACTIONS;
    table->stats->apply_actions = DP_SUPPORTED_ACTIONS;
    table->stats->config        = OFPTC_TABLE_MISS_CONTROLLER;
    table->stats->max_entries   = FLOW_TABLE_MAX_ENTRIES;
    table->stats->active_count  = 0;
    table->stats->lookup_count  = 0;
    table->stats->matched_count = 0;

    list_init(&table->match_entries);
    list_init(&table->hard_entries);
    list_init(&table->idle_entries);

    return table;
}

static void
test_pcap(struct ovs_cmdl_context *ctx)
{
    size_t total_count, batch_size_;
    struct pcap_file *pcap;
    int err = 0;

    pcap = ovs_pcap_open(ctx->argv[1], "rb");
    if (!pcap) {
        return;
    }

    batch_size_ = 1;
    if (ctx->argc > 2) {
        batch_size_ = strtoul(ctx->argv[2], NULL, 0);
        if (batch_size_ == 0 || batch_size_ > NETDEV_MAX_BURST) {
            ovs_fatal(0,
                      "batch_size must be between 1 and NETDEV_MAX_BURST(%u)",
                      NETDEV_MAX_BURST);
        }
    }

    fatal_signal_init();

    ct = conntrack_init();
    total_count = 0;
    for (;;) {
        struct dp_packet *packet;
        struct dp_packet_batch pkt_batch_;
        struct dp_packet_batch *batch = &pkt_batch_;

        dp_packet_batch_init(batch);
        for (int i = 0; i < batch_size_; i++) {
            err = ovs_pcap_read(pcap, &packet, NULL);
            if (err) {
                break;
            }
            dp_packet_batch_add(batch, packet);
        }
        if (dp_packet_batch_is_empty(batch)) {
            break;
        }
        pcap_batch_execute_conntrack(ct, batch);

        DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
            struct ds ds = DS_EMPTY_INITIALIZER;

            total_count++;

            format_flags(&ds, ct_state_to_string, packet->md.ct_state, '|');
            printf("%"PRIuSIZE": %s\n", total_count, ds_cstr(&ds));

            ds_destroy(&ds);
        }

        dp_packet_delete_batch(batch, true);
    }
    conntrack_destroy(ct);
    ovs_pcap_close(pcap);
}

static void
jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title,
                const struct jsonrpc_msg *msg)
{
    if (VLOG_IS_DBG_ENABLED()) {
        struct ds s = DS_EMPTY_INITIALIZER;
        if (msg->method) {
            ds_put_format(&s, ", method=\"%s\"", msg->method);
        }
        if (msg->params) {
            ds_put_cstr(&s, ", params=");
            json_to_ds(msg->params, 0, &s);
        }
        if (msg->result) {
            ds_put_cstr(&s, ", result=");
            json_to_ds(msg->result, 0, &s);
        }
        if (msg->error) {
            ds_put_cstr(&s, ", error=");
            json_to_ds(msg->error, 0, &s);
        }
        if (msg->id) {
            ds_put_cstr(&s, ", id=");
            json_to_ds(msg->id, 0, &s);
        }
        VLOG_DBG("%s: %s %s%s", rpc->name, title,
                 jsonrpc_msg_type_to_string(msg->type), ds_cstr(&s));
        ds_destroy(&s);
    }
}

static int
parse_actions(const char *in)
{
    struct ofpbuf odp_actions;
    struct ds out;
    int error;

    /* Convert string to OVS DP actions. */
    ofpbuf_init(&odp_actions, 0);
    error = odp_actions_from_string(in, NULL, &odp_actions);
    if (error) {
        printf("odp_actions_from_string: error\n");
        goto next;
    }

    /* Convert odp_actions back to string. */
    ds_init(&out);
    format_odp_actions(&out, odp_actions.data, odp_actions.size, NULL);
    puts(ds_cstr(&out));
    ds_destroy(&out);

next:
    ofpbuf_uninit(&odp_actions);
    return 0;
}

void
handle_acl_log(const struct flow *headers, struct ofpbuf *userdata)
{
    if (!VLOG_IS_INFO_ENABLED()) {
        return;
    }

    struct log_pin_header *lph = ofpbuf_try_pull(userdata, sizeof *lph);
    if (!lph) {
        VLOG_WARN("log data missing");
        return;
    }

    size_t name_len = userdata->size;
    char *name = name_len ? xmemdup0(userdata->data, name_len) : NULL;

    struct ds ds = DS_EMPTY_INITIALIZER;
    ds_put_cstr(&ds, "name=");
    json_string_escape(name_len ? name : "<unnamed>", &ds);
    ds_put_format(&ds, ", verdict=%s, severity=%s: ",
                  log_verdict_to_string(lph->verdict),
                  log_severity_to_string(lph->severity));
    flow_format(&ds, headers, NULL);

    VLOG_INFO("%s", ds_cstr(&ds));
    ds_destroy(&ds);
    free(name);
}

/* Generate a syntax fragment for NV and append it to STR */
static void
new_value_append_syntax (GString *str, const struct new_value *nv)
{
  switch (nv->type)
    {
    case NV_NUMERIC:
      g_string_append_printf (str, "%g", nv->v.v);
      break;
    case NV_STRING:
      {
	struct string ds = DS_EMPTY_INITIALIZER;
	syntax_gen_string (&ds, ss_cstr (nv->v.s));
	g_string_append (str, ds_cstr (&ds));
	ds_destroy (&ds);
      }
      break;
    case NV_COPY:
      g_string_append (str, "COPY");
      break;
    case NV_SYSMIS:
      g_string_append (str, "SYSMIS");
      break;
    default:
      /* Shouldn't ever happen */
      g_warning ("Invalid type in new recode value");
      g_string_append (str, "???");
      break;
    }
}