interactive.c

   1 #include "adu.h"
   2 #include "string.h"
   3 #include "error.h"
   4 #include "cmdline.h"
   5 #include "select.cmdline.h"
   6
   7 struct interactive_command {
   8         const char *name;
   9         int (*handler)(char *);
  10         const char *desc;
  11 };
  12
  13 #define INTERACTIVE_COMMANDS \
  14         INTERACTIVE_COMMAND(dump, "dump the current configuration") \
  15         INTERACTIVE_COMMAND(set, "change the current configuration") \
  16         INTERACTIVE_COMMAND(reset, "reset configuration to defaults") \
  17         INTERACTIVE_COMMAND(help, "show list of commands and one-line descriptions") \
  18
  19
  20 #define INTERACTIVE_COMMAND(name, desc) \
  21         static int icom_ ## name (char *line);
  22
  23 INTERACTIVE_COMMANDS
  24
  25 #undef INTERACTIVE_COMMAND
  26
  27 #define INTERACTIVE_COMMAND(_name, _desc) \
  28         { \
  29         .name = #_name, \
  30         .handler = icom_ ## _name, \
  31         .desc = _desc \
  32         },
  33
  34 struct interactive_command icmds[] = {
  35         INTERACTIVE_COMMANDS
  36         {.name  = NULL}
  37 };
  38
  39 #define FOR_EACH_COMMAND(c) for (c = icmds; c->name; c++)
  40
  41 static int read_input_line(char *line, size_t size)
  42 {
  43         return fgets(line, size, stdin)? 1 : -1;
  44 }
  45
  46 static int icom_help(__a_unused char *line)
  47 {
  48         struct interactive_command *c;
  49
  50         FOR_EACH_COMMAND(c)
  51                 fprintf(stdout, "%s\t%s\n", c->name, c->desc);
  52         return 1;
  53 }
  54
  55 static int icom_reset(__a_unused char *line)
  56 {
  57         select_cmdline_parser_init(&select_conf);
  58         return 1;
  59 }
  60
  61 static struct uid_range *admissible_uids;
  62
  63 static int icom_set(char *line)
  64 {
  65         struct select_cmdline_parser_params params = {
  66                 .override = 1,
  67                 .initialize = 0,
  68                 .check_required = 1,
  69                 .check_ambiguity = 0,
  70                 .print_errors = 1
  71         };
  72         if (select_cmdline_parser_string_ext(line, &select_conf, "select",
  73                 &params))
  74                 return -E_SYNTAX;
  75         return parse_uid_arg(select_conf.uid_arg, &admissible_uids);
  76 }
  77
  78 static int icom_dump(__a_unused char *line)
  79 {
  80         ERROR_LOG("dump: %s\n", select_conf.format_arg);
  81         select_cmdline_parser_dump(stdout, &select_conf);
  82         return 1;
  83 }
  84
  85 static int exec_interactive_command(char *line)
  86 {
  87         const char const *delim = "\t\n ";
  88         int i;
  89         char *cmd = adu_strdup(line + strspn(line, delim));
  90         char *p = cmd + strcspn(cmd, delim);
  91         int ret = -E_SYNTAX;
  92
  93         *p = '\0';
  94         p++;
  95         for (i = 0; icmds[i].name; i++) {
  96                 ERROR_LOG("name: %s, cmd: %s.\n", icmds[i].name, cmd);
  97                 if (strcmp(icmds[i].name, cmd))
  98                         continue;
  99                 ERROR_LOG("exec cmd: %s, args: %s\n", cmd, p);
 100                 ret = icmds[i].handler(p);
 101                 break;
 102         }
 103         free(cmd);
 104         return ret;
 105 }
 106
 107 int com_interactive(void)
 108 {
 109         char line[255];
 110         int ret = 1;
 111
 112         while (read_input_line(line, sizeof(line)) >= 0) {
 113                 size_t len = strlen(line);
 114                 if (!len)
 115                         continue;
 116                 if (line[len - 1] == '\n')
 117                         line[len - 1] = '\0';
 118                 ret = exec_interactive_command(line);
 119                 if (ret < 0)
 120                         printf("%s\n", adu_strerror(-ret));
 121         }
 122         return ret;
 123 }