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         select_cmdline_parser_init(&select_conf);
  74         return 1;
  75 }
  76
  77 static int icom_set(char *line)
  78 {
  79         struct select_cmdline_parser_params params = {
  80                 .override = 1,
  81                 .initialize = 0,
  82                 .check_required = 1,
  83                 .check_ambiguity = 0,
  84                 .print_errors = 1
  85         };
  86         if (!line) {
  87                 select_cmdline_parser_dump(stdout, &select_conf);
  88                 return 1;
  89         }
  90
  91         free_format_info(fi);
  92         return parse_select_options(line, &params, &admissible_uids, &fi);
  93 }
  94
  95 static int exec_interactive_command(char *line)
  96 {
  97         const char const *delim = "\t\n\f\r\v ";
  98         int i;
  99         char *cmd, *args;
 100         int ret = -E_SYNTAX;
 101         size_t len;
 102
 103         if (!line || !*line)
 104                 return 1;
 105         len = strlen(line);
 106
 107         while (len && isspace(line[len - 1])) {
 108                 line[len - 1] = '\0';
 109                 len--;
 110         }
 111         if (!len)
 112                 return 1;
 113         line += strspn(line, delim); /* skip initial whitespace */
 114         if (!*line)
 115                 return 1;
 116         /* OK, we have a non-empty line */
 117         cmd = adu_strdup(line);
 118         args = cmd + strcspn(cmd, delim);
 119         if (!*args)
 120                 args = NULL;
 121         else {
 122                 *args = '\0';
 123                 args++;
 124                 /* let p point to the next non-whitespace char */
 125                 args += strspn(args, delim);
 126                 if (!*args)
 127                         args = NULL;
 128         }
 129         DEBUG_LOG("name: %s, args: %s.\n", cmd, args);
 130         for (i = 0; icmds[i].name; i++) {
 131                 if (strcmp(icmds[i].name, cmd))
 132                         continue;
 133                 INFO_LOG("exec cmd: %s, args: %s\n", cmd, args);
 134                 ret = icmds[i].handler(args);
 135                 break;
 136         }
 137         free(cmd);
 138         return ret;
 139 }
 140
 141 int com_interactive(void)
 142 {
 143         char line[255];
 144         int ret = 1;
 145
 146         select_cmdline_parser_init(&select_conf);
 147         ret = parse_select_options(NULL, NULL, &admissible_uids, &fi);
 148         while (read_input_line(line, sizeof(line)) >= 0) {
 149                 ret = exec_interactive_command(line);
 150                 if (ret < 0)
 151                         printf("%s\n", adu_strerror(-ret));
 152         }
 153         return ret;
 154 }