User handling improvments.
[adu.git] / 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 }