recv_common.c

   1 /*
   2  * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file recv_common.c common functions of para_recv and para_audiod */
   8
   9 #include <regex.h>
  10 #include <stdbool.h>
  11
  12 #include "para.h"
  13 #include "list.h"
  14 #include "sched.h"
  15 #include "ggo.h"
  16 #include "recv.h"
  17 #include "string.h"
  18 #include "buffer_tree.h"
  19
  20 DEFINE_RECEIVER_ARRAY;
  21
  22 /**
  23  * Call the init function of each paraslash receiver.
  24  */
  25 void recv_init(void)
  26 {
  27         int i;
  28
  29         FOR_EACH_RECEIVER(i)
  30                 receivers[i].init(&receivers[i]);
  31 }
  32
  33 static void *parse_receiver_args(int receiver_num, char *options)
  34 {
  35         struct receiver *r = &receivers[receiver_num];
  36         char **argv;
  37         int argc, i;
  38         void *conf;
  39
  40
  41         PARA_DEBUG_LOG("%s, options: %s\n", r->name,
  42                 options? options : "(none)");
  43         if (options) {
  44                 PARA_DEBUG_LOG("options: %s\n", options);
  45                 argc = create_argv(options, " \t", &argv);
  46                 if (argc < 0)
  47                         return NULL;
  48                 for (i = argc - 1; i >= 0; i--)
  49                         argv[i + 1] = argv[i];
  50                 argv[0] = NULL;
  51                 argc++;
  52         } else {
  53                 argc = 1;
  54                 argv = para_malloc(2 * sizeof(char*));
  55                 argv[0] = NULL;
  56                 argv[1] = NULL;
  57         }
  58         conf = r->parse_config(argc, argv);
  59         for (i = 1; i < argc; i++)
  60                 free(argv[i]);
  61         free(argv);
  62         return conf;
  63 }
  64
  65 /**
  66  * check if given string is a valid command line for any receiver
  67  *
  68  * \param \ra string of the form receiver_name:options
  69  * \param receiver_num contains the number of the receiver upon success
  70  *
  71  * This function checks whether \a ra starts with the name of a supported
  72  * paraslash receiver, optinally followed by a colon and any options for that
  73  * receiver. If a valid receiver name was found and further are present, the
  74  * remaining part of \a ra is passed to that receiver's config parser.
  75  *
  76  * \return On success, a pointer to the gengetopt args info struct is returned
  77  * and \a receiver_num contains the number of the receiver. Otherwise this function
  78  * returns \p NULL.
  79  */
  80 void *check_receiver_arg(char *ra, int *receiver_num)
  81 {
  82         int j;
  83
  84         PARA_DEBUG_LOG("checking %s\n", ra);
  85         for (j = 0; receivers[j].name; j++) {
  86                 const char *name = receivers[j].name;
  87                 size_t len = strlen(name);
  88                 char c;
  89                 if (strlen(ra) < len)
  90                         continue;
  91                 if (strncmp(name, ra, len))
  92                         continue;
  93                 c = ra[len];
  94                 if (c && c != ' ')
  95                         continue;
  96                 if (c && !receivers[j].parse_config)
  97                         return NULL;
  98                 *receiver_num = j;
  99                 return parse_receiver_args(j, c? ra + len + 1: NULL);
 100         }
 101         PARA_ERROR_LOG("receiver not found\n");
 102         return NULL;
 103 }
 104
 105 /**
 106  * Print out the help texts to all receivers.
 107  *
 108  * \param detailed Whether the detailed help should be printed.
 109  */
 110 void print_receiver_helps(int detailed)
 111 {
 112         int i;
 113
 114         printf_or_die("\nAvailable receivers: \n\t");
 115         FOR_EACH_RECEIVER(i)
 116                 printf_or_die("%s%s", i? " " : "", receivers[i].name);
 117         printf_or_die("\n\n");
 118         FOR_EACH_RECEIVER(i) {
 119                 struct receiver *r = receivers + i;
 120                 if (!r->help.short_help)
 121                         continue;
 122                 printf_or_die("Options for %s:\n", r->name);
 123                 ggo_print_help(&r->help, detailed);
 124         }
 125 }
 126
 127 int generic_recv_pre_select(struct sched *s, struct task *t)
 128 {
 129         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 130         int ret = btr_node_status(rn->btrn, 0, BTR_NT_ROOT);
 131
 132         t->error = 0;
 133         if (ret < 0) {
 134                 s->timeout.tv_sec = 0;
 135                 s->timeout.tv_usec = 1;
 136         }
 137         return ret;
 138 }