Fix sorting of the uid hash table.
[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         INTERACTIVE_COMMAND(source, "read and execute interactive commands from a file")
35
36
37 #define INTERACTIVE_COMMAND(name, desc) \
38         static int icom_ ## name (char *line);
39
40 INTERACTIVE_COMMANDS
41
42 #undef INTERACTIVE_COMMAND
43
44 #define INTERACTIVE_COMMAND(_name, _desc) \
45         { \
46         .name = #_name, \
47         .handler = icom_ ## _name, \
48         .desc = _desc \
49         },
50
51 struct interactive_command icmds[] = {
52         INTERACTIVE_COMMANDS
53         {.name  = NULL}
54 };
55
56 #define FOR_EACH_COMMAND(c) for (c = icmds; c->name; c++)
57
58 static int read_input_line(char *line, size_t size)
59 {
60         return fgets(line, size, stdin)? 1 : -1;
61 }
62
63 static int icom_run(__a_unused char *line)
64 {
65         return run_select_query(admissible_uids, fi);
66 }
67
68 static int icom_help(__a_unused char *line)
69 {
70         struct interactive_command *c;
71
72         FOR_EACH_COMMAND(c)
73                 fprintf(stdout, "%s\t%s\n", c->name, c->desc);
74         return 1;
75 }
76
77 void print_interactive_help(void)
78 {
79         struct interactive_command *c;
80         FOR_EACH_COMMAND(c)
81                 fprintf(stdout, "\t%s\t%s\n", c->name, c->desc);
82 }
83
84 static int icom_reset(__a_unused char *line)
85 {
86         NOTICE_LOG("resetting configuration to default\n");
87         free_format_info(fi);
88         fi = NULL;
89         free(admissible_uids);
90         admissible_uids = NULL;
91         select_cmdline_parser_init(&select_conf);
92         return parse_select_options(NULL, NULL, &admissible_uids, &fi);
93 }
94
95 static int icom_set(char *line)
96 {
97         int ret;
98         struct select_cmdline_parser_params params = {
99                 .override = 1,
100                 .initialize = 0,
101                 .check_required = 1,
102                 .check_ambiguity = 0,
103                 .print_errors = 1
104         };
105         if (!line) {
106                 select_cmdline_parser_dump(stdout, &select_conf);
107                 return 1;
108         }
109
110         free_format_info(fi);
111         fi = NULL;
112         free(admissible_uids);
113         admissible_uids = NULL;
114         ret = parse_select_options(line, &params, &admissible_uids, &fi);
115         if (ret >= 0)
116                 return ret;
117         return icom_reset(NULL);
118 }
119
120 static int exec_interactive_command(char *line)
121 {
122         const char const *delim = "\t\n\f\r\v ";
123         int i;
124         char *cmd, *args;
125         int ret = -E_SYNTAX;
126         size_t len;
127
128         if (!line || !*line)
129                 return 1;
130         len = strlen(line);
131
132         while (len && isspace(line[len - 1])) {
133                 line[len - 1] = '\0';
134                 len--;
135         }
136         if (!len)
137                 return 1;
138         line += strspn(line, delim); /* skip initial whitespace */
139         if (!*line)
140                 return 1;
141         /* OK, we have a non-empty line */
142         if (*line == '#')
143                 return 1;
144         cmd = adu_strdup(line);
145         args = cmd + strcspn(cmd, delim);
146         if (!*args)
147                 args = NULL;
148         else {
149                 *args = '\0';
150                 args++;
151                 /* let args point to the next non-whitespace char */
152                 args += strspn(args, delim);
153                 if (!*args)
154                         args = NULL;
155         }
156         DEBUG_LOG("name: %s, args: %s.\n", cmd, args);
157         for (i = 0; icmds[i].name; i++) {
158                 if (strcmp(icmds[i].name, cmd))
159                         continue;
160                 INFO_LOG("exec cmd: %s, args: %s\n", cmd, args);
161                 ret = icmds[i].handler(args);
162                 break;
163         }
164         free(cmd);
165         return ret;
166 }
167
168 static int icom_source(char *args)
169 {
170         char line[255];
171         FILE *src = fopen(args, "r");
172         int ret;
173
174         if (!src)
175                 return -ERRNO_TO_ERROR(errno);
176         while (fgets(line, sizeof(line), src)) {
177                 ret = exec_interactive_command(line);
178                 if (ret < 0)
179                         goto out;
180         }
181         ret = 1;
182 out:
183         fclose(src);
184         return ret;
185 }
186
187 int com_interactive(void)
188 {
189         char line[255];
190         int ret = 1;
191
192         select_cmdline_parser_init(&select_conf);
193         ret = parse_select_options(NULL, NULL, &admissible_uids, &fi);
194         if (ret< 0)
195                 return ret;
196         ret = read_uid_file();
197         if (ret < 0)
198                 return ret;
199         while (read_input_line(line, sizeof(line)) >= 0) {
200                 ret = exec_interactive_command(line);
201                 if (ret < 0)
202                         printf("%s\n", adu_strerror(-ret));
203         }
204         return ret;
205 }