parse_format_string(): Explicitly set the result pointer to NULL on errors.
[adu.git] / 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 }