interactive.c

   1 #include <ctype.h> /* isspace() */
   2
   3 #include "adu.h"
   4 #include "format.h"
   5 #include "user.h"
   6 #include "string.h"
   7 #include "select.cmdline.h"
   8 #include "select.h"
   9 #include "error.h"
  10
  11 /**
  12  * Describes one valid command for interactive mode.
  13  *
  14  * When invoked in interactive mode, adu reads commands from stdin. There's a
  15  * static array of all such commands.
  16  */
  17 struct interactive_command {
  18         /** The name of the command. */
  19         const char *name;
  20         /** Pointer to The function that is being executed. */
  21         int (*handler)(char *);
  22         /** Help text. */
  23         const char *desc;
  24 };
  25
  26 static struct uid_range *admissible_uids;
  27 static struct format_info *fi;
  28
  29 #define INTERACTIVE_COMMANDS \
  30         INTERACTIVE_COMMAND(set, "change the current configuration") \
  31         INTERACTIVE_COMMAND(reset, "reset configuration to defaults") \
  32         INTERACTIVE_COMMAND(help, "show list of commands and one-line descriptions") \
  33         INTERACTIVE_COMMAND(run, "start the query according to the current configuration")
  34
  35
  36 #define INTERACTIVE_COMMAND(name, desc) \
  37         static int icom_ ## name (char *line);
  38
  39 INTERACTIVE_COMMANDS
  40
  41 #undef INTERACTIVE_COMMAND
  42
  43 #define INTERACTIVE_COMMAND(_name, _desc) \
  44         { \
  45         .name = #_name, \
  46         .handler = icom_ ## _name, \
  47         .desc = _desc \
  48         },
  49
  50 struct interactive_command icmds[] = {
  51         INTERACTIVE_COMMANDS
  52         {.name  = NULL}
  53 };
  54
  55 #define FOR_EACH_COMMAND(c) for (c = icmds; c->name; c++)
  56
  57 static int read_input_line(char *line, size_t size)
  58 {
  59         return fgets(line, size, stdin)? 1 : -1;
  60 }
  61
  62 static int icom_run(__a_unused char *line)
  63 {
  64         return run_select_query(admissible_uids, fi);
  65 }
  66
  67 static int icom_help(__a_unused char *line)
  68 {
  69         struct interactive_command *c;
  70
  71         FOR_EACH_COMMAND(c)
  72                 fprintf(stdout, "%s\t%s\n", c->name, c->desc);
  73         return 1;
  74 }
  75
  76 void print_interactive_help(void)
  77 {
  78         struct interactive_command *c;
  79         FOR_EACH_COMMAND(c)
  80                 fprintf(stdout, "\t%s\t%s\n", c->name, c->desc);
  81 }
  82
  83 static int icom_reset(__a_unused char *line)
  84 {
  85         free_format_info(fi);
  86         fi = NULL;
  87         free(admissible_uids);
  88         admissible_uids = NULL;
  89         select_cmdline_parser_init(&select_conf);
  90         return 1;
  91 }
  92
  93 static int icom_set(char *line)
  94 {
  95         struct select_cmdline_parser_params params = {
  96                 .override = 1,
  97                 .initialize = 0,
  98                 .check_required = 1,
  99                 .check_ambiguity = 0,
 100                 .print_errors = 1
 101         };
 102         if (!line) {
 103                 select_cmdline_parser_dump(stdout, &select_conf);
 104                 return 1;
 105         }
 106
 107         free_format_info(fi);
 108         fi = NULL;
 109         free(admissible_uids);
 110         admissible_uids = NULL;
 111         return parse_select_options(line, &params, &admissible_uids, &fi);
 112 }
 113
 114 static int exec_interactive_command(char *line)
 115 {
 116         const char const *delim = "\t\n\f\r\v ";
 117         int i;
 118         char *cmd, *args;
 119         int ret = -E_SYNTAX;
 120         size_t len;
 121
 122         if (!line || !*line)
 123                 return 1;
 124         len = strlen(line);
 125
 126         while (len && isspace(line[len - 1])) {
 127                 line[len - 1] = '\0';
 128                 len--;
 129         }
 130         if (!len)
 131                 return 1;
 132         line += strspn(line, delim); /* skip initial whitespace */
 133         if (!*line)
 134                 return 1;
 135         /* OK, we have a non-empty line */
 136         if (*line == '#')
 137                 return 1;
 138         cmd = adu_strdup(line);
 139         args = cmd + strcspn(cmd, delim);
 140         if (!*args)
 141                 args = NULL;
 142         else {
 143                 *args = '\0';
 144                 args++;
 145                 /* let p point to the next non-whitespace char */
 146                 args += strspn(args, delim);
 147                 if (!*args)
 148                         args = NULL;
 149         }
 150         DEBUG_LOG("name: %s, args: %s.\n", cmd, args);
 151         for (i = 0; icmds[i].name; i++) {
 152                 if (strcmp(icmds[i].name, cmd))
 153                         continue;
 154                 INFO_LOG("exec cmd: %s, args: %s\n", cmd, args);
 155                 ret = icmds[i].handler(args);
 156                 break;
 157         }
 158         free(cmd);
 159         return ret;
 160 }
 161
 162 int com_interactive(void)
 163 {
 164         char line[255];
 165         int ret = 1;
 166
 167         select_cmdline_parser_init(&select_conf);
 168         ret = parse_select_options(NULL, NULL, &admissible_uids, &fi);
 169         while (read_input_line(line, sizeof(line)) >= 0) {
 170                 ret = exec_interactive_command(line);
 171                 if (ret < 0)
 172                         printf("%s\n", adu_strerror(-ret));
 173         }
 174         return ret;
 175 }