1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
/* Copyright Meta Platforms, Inc. and affiliates */
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "main.h"
const char *bin_name;
static int last_argc;
static char **last_argv;
static int (*last_do_help)(int argc, char **argv);
json_writer_t *json_wtr;
bool pretty_output;
bool json_output;
static void __attribute__((noreturn)) clean_and_exit(int i)
{
if (json_output)
jsonw_destroy(&json_wtr);
exit(i);
}
void usage(void)
{
last_do_help(last_argc - 1, last_argv + 1);
clean_and_exit(-1);
}
static int do_help(int argc __attribute__((unused)),
char **argv __attribute__((unused)))
{
if (json_output) {
jsonw_null(json_wtr);
return 0;
}
fprintf(stderr,
"Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
" %s version\n"
"\n"
" OBJECT := { page-pool | qstats }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, bin_name);
return 0;
}
static int do_version(int argc __attribute__((unused)),
char **argv __attribute__((unused)))
{
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "version");
jsonw_printf(json_wtr, SRC_VERSION);
jsonw_end_object(json_wtr);
} else {
printf("%s " SRC_VERSION "\n", bin_name);
}
return 0;
}
static const struct cmd commands[] = {
{ "help", do_help },
{ "page-pool", do_page_pool },
{ "qstats", do_qstats },
{ "version", do_version },
{ 0 }
};
int cmd_select(const struct cmd *cmds, int argc, char **argv,
int (*help)(int argc, char **argv))
{
unsigned int i;
last_argc = argc;
last_argv = argv;
last_do_help = help;
if (argc < 1 && cmds[0].func)
return cmds[0].func(argc, argv);
for (i = 0; cmds[i].cmd; i++) {
if (is_prefix(*argv, cmds[i].cmd)) {
if (!cmds[i].func) {
p_err("command '%s' is not available", cmds[i].cmd);
return -1;
}
return cmds[i].func(argc - 1, argv + 1);
}
}
help(argc - 1, argv + 1);
return -1;
}
bool is_prefix(const char *pfx, const char *str)
{
if (!pfx)
return false;
if (strlen(str) < strlen(pfx))
return false;
return !memcmp(str, pfx, strlen(pfx));
}
/* Last argument MUST be NULL pointer */
int detect_common_prefix(const char *arg, ...)
{
unsigned int count = 0;
const char *ref;
char msg[256];
va_list ap;
snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg);
va_start(ap, arg);
while ((ref = va_arg(ap, const char *))) {
if (!is_prefix(arg, ref))
continue;
count++;
if (count > 1)
strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1);
strncat(msg, ref, sizeof(msg) - strlen(msg) - 1);
}
va_end(ap);
strncat(msg, "'", sizeof(msg) - strlen(msg) - 1);
if (count >= 2) {
p_err("%s", msg);
return -1;
}
return 0;
}
void p_err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (json_output) {
jsonw_start_object(json_wtr);
jsonw_name(json_wtr, "error");
jsonw_vprintf_enquote(json_wtr, fmt, ap);
jsonw_end_object(json_wtr);
} else {
fprintf(stderr, "Error: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
}
va_end(ap);
}
void p_info(const char *fmt, ...)
{
va_list ap;
if (json_output)
return;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
int main(int argc, char **argv)
{
static const struct option options[] = {
{ "json", no_argument, NULL, 'j' },
{ "help", no_argument, NULL, 'h' },
{ "pretty", no_argument, NULL, 'p' },
{ "version", no_argument, NULL, 'V' },
{ 0 }
};
bool version_requested = false;
int opt, ret;
setlinebuf(stdout);
last_do_help = do_help;
pretty_output = false;
json_output = false;
bin_name = "ynltool";
opterr = 0;
while ((opt = getopt_long(argc, argv, "Vhjp",
options, NULL)) >= 0) {
switch (opt) {
case 'V':
version_requested = true;
break;
case 'h':
return do_help(argc, argv);
case 'p':
pretty_output = true;
/* fall through */
case 'j':
if (!json_output) {
json_wtr = jsonw_new(stdout);
if (!json_wtr) {
p_err("failed to create JSON writer");
return -1;
}
json_output = true;
}
jsonw_pretty(json_wtr, pretty_output);
break;
default:
p_err("unrecognized option '%s'", argv[optind - 1]);
if (json_output)
clean_and_exit(-1);
else
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 0)
usage();
if (version_requested)
ret = do_version(argc, argv);
else
ret = cmd_select(commands, argc, argv, do_help);
if (json_output)
jsonw_destroy(&json_wtr);
return ret;
}
|
