interactive.c

   1 #include <ctype.h> /* isspace() */
   2
   3 #include "adu.h"
   4 #include "format.h"
   5 #include "select.h"
   6 #include "string.h"
   7 #include "error.h"
   8 #include "cmdline.h"
   9
  10 struct interactive_command {
  11         const char *name;
  12         int (*handler)(char *);
  13         const char *desc;
  14 };
  15
  16 static struct uid_range *admissible_uids;
  17 static struct format_info *fi;
  18
  19 #define INTERACTIVE_COMMANDS \
  20         INTERACTIVE_COMMAND(set, "change the current configuration") \
  21         INTERACTIVE_COMMAND(reset, "reset configuration to defaults") \
  22         INTERACTIVE_COMMAND(help, "show list of commands and one-line descriptions") \
  23         INTERACTIVE_COMMAND(run, "start the query according to the current configuration")
  24
  25
  26 #define INTERACTIVE_COMMAND(name, desc) \
  27         static int icom_ ## name (char *line);
  28
  29 INTERACTIVE_COMMANDS
  30
  31 #undef INTERACTIVE_COMMAND
  32
  33 #define INTERACTIVE_COMMAND(_name, _desc) \
  34         { \
  35         .name = #_name, \
  36         .handler = icom_ ## _name, \
  37         .desc = _desc \
  38         },
  39
  40 struct interactive_command icmds[] = {
  41         INTERACTIVE_COMMANDS
  42         {.name  = NULL}
  43 };
  44
  45 #define FOR_EACH_COMMAND(c) for (c = icmds; c->name; c++)
  46
  47 static int read_input_line(char *line, size_t size)
  48 {
  49         return fgets(line, size, stdin)? 1 : -1;
  50 }
  51
  52 static int icom_run(__a_unused char *line)
  53 {
  54         return run_select_query(admissible_uids, fi);
  55 }
  56
  57 static int icom_help(__a_unused char *line)
  58 {
  59         struct interactive_command *c;
  60
  61         FOR_EACH_COMMAND(c)
  62                 fprintf(stdout, "%s\t%s\n", c->name, c->desc);
  63         return 1;
  64 }
  65
  66 void print_interactive_help(void)
  67 {
  68         icom_help(NULL);
  69 }
  70
  71 static int icom_reset(__a_unused char *line)
  72 {
  73         free_format_info(fi);
  74         fi = NULL;
  75         free(admissible_uids);
  76         admissible_uids = NULL;
  77         select_cmdline_parser_init(&select_conf);
  78         return 1;
  79 }
  80
  81 static int icom_set(char *line)
  82 {
  83         struct select_cmdline_parser_params params = {
  84                 .override = 1,
  85                 .initialize = 0,
  86                 .check_required = 1,
  87                 .check_ambiguity = 0,
  88                 .print_errors = 1
  89         };
  90         if (!line) {
  91                 select_cmdline_parser_dump(stdout, &select_conf);
  92                 return 1;
  93         }
  94
  95         free_format_info(fi);
  96         fi = NULL;
  97         free(admissible_uids);
  98         admissible_uids = NULL;
  99         return parse_select_options(line, &params, &admissible_uids, &fi);
 100 }
 101
 102 static int exec_interactive_command(char *line)
 103 {
 104         const char const *delim = "\t\n\f\r\v ";
 105         int i;
 106         char *cmd, *args;
 107         int ret = -E_SYNTAX;
 108         size_t len;
 109
 110         if (!line || !*line)
 111                 return 1;
 112         len = strlen(line);
 113
 114         while (len && isspace(line[len - 1])) {
 115                 line[len - 1] = '\0';
 116                 len--;
 117         }
 118         if (!len)
 119                 return 1;
 120         line += strspn(line, delim); /* skip initial whitespace */
 121         if (!*line)
 122                 return 1;
 123         /* OK, we have a non-empty line */
 124         cmd = adu_strdup(line);
 125         args = cmd + strcspn(cmd, delim);
 126         if (!*args)
 127                 args = NULL;
 128         else {
 129                 *args = '\0';
 130                 args++;
 131                 /* let p point to the next non-whitespace char */
 132                 args += strspn(args, delim);
 133                 if (!*args)
 134                         args = NULL;
 135         }
 136         DEBUG_LOG("name: %s, args: %s.\n", cmd, args);
 137         for (i = 0; icmds[i].name; i++) {
 138                 if (strcmp(icmds[i].name, cmd))
 139                         continue;
 140                 INFO_LOG("exec cmd: %s, args: %s\n", cmd, args);
 141                 ret = icmds[i].handler(args);
 142                 break;
 143         }
 144         free(cmd);
 145         return ret;
 146 }
 147
 148 int com_interactive(void)
 149 {
 150         char line[255];
 151         int ret = 1;
 152
 153         select_cmdline_parser_init(&select_conf);
 154         ret = parse_select_options(NULL, NULL, &admissible_uids, &fi);
 155         while (read_input_line(line, sizeof(line)) >= 0) {
 156                 ret = exec_interactive_command(line);
 157                 if (ret < 0)
 158                         printf("%s\n", adu_strerror(-ret));
 159         }
 160         return ret;
 161 }