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
|
#include "git-compat-util.h"
#include "parse-options.h"
#include "strbuf.h"
#define OPT_SHORT 1
#define OPT_UNSET 2
struct optparse_t {
const char **argv;
int argc;
const char *opt;
};
static inline const char *get_arg(struct optparse_t *p)
{
if (p->opt) {
const char *res = p->opt;
p->opt = NULL;
return res;
}
p->argc--;
return *++p->argv;
}
static inline const char *skip_prefix(const char *str, const char *prefix)
{
size_t len = strlen(prefix);
return strncmp(str, prefix, len) ? NULL : str + len;
}
static int opterror(const struct option *opt, const char *reason, int flags)
{
if (flags & OPT_SHORT)
return error("switch `%c' %s", opt->short_name, reason);
if (flags & OPT_UNSET)
return error("option `no-%s' %s", opt->long_name, reason);
return error("option `%s' %s", opt->long_name, reason);
}
static int get_value(struct optparse_t *p,
const struct option *opt, int flags)
{
const char *s;
if (p->opt && (flags & OPT_UNSET))
return opterror(opt, "takes no value", flags);
switch (opt->type) {
case OPTION_BOOLEAN:
if (!(flags & OPT_SHORT) && p->opt)
return opterror(opt, "takes no value", flags);
if (flags & OPT_UNSET)
*(int *)opt->value = 0;
else
(*(int *)opt->value)++;
return 0;
case OPTION_STRING:
if (flags & OPT_UNSET) {
*(const char **)opt->value = (const char *)NULL;
return 0;
}
if (!p->opt && p->argc <= 1)
return opterror(opt, "requires a value", flags);
*(const char **)opt->value = get_arg(p);
return 0;
case OPTION_INTEGER:
if (flags & OPT_UNSET) {
*(int *)opt->value = 0;
return 0;
}
if (!p->opt && p->argc <= 1)
return opterror(opt, "requires a value", flags);
*(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
if (*s)
return opterror(opt, "expects a numerical value", flags);
return 0;
default:
die("should not happen, someone must be hit on the forehead");
}
}
static int parse_short_opt(struct optparse_t *p, const struct option *options)
{
for (; options->type != OPTION_END; options++) {
if (options->short_name == *p->opt) {
p->opt = p->opt[1] ? p->opt + 1 : NULL;
return get_value(p, options, OPT_SHORT);
}
}
return error("unknown switch `%c'", *p->opt);
}
static int parse_long_opt(struct optparse_t *p, const char *arg,
const struct option *options)
{
for (; options->type != OPTION_END; options++) {
const char *rest;
int flags = 0;
if (!options->long_name)
continue;
rest = skip_prefix(arg, options->long_name);
if (!rest) {
if (strncmp(arg, "no-", 3))
continue;
flags |= OPT_UNSET;
rest = skip_prefix(arg + 3, options->long_name);
if (!rest)
continue;
}
if (*rest) {
if (*rest != '=')
continue;
p->opt = rest + 1;
}
return get_value(p, options, flags);
}
return error("unknown option `%s'", arg);
}
int parse_options(int argc, const char **argv, const struct option *options,
const char *usagestr, int flags)
{
struct optparse_t args = { argv + 1, argc - 1, NULL };
int j = 0;
for (; args.argc; args.argc--, args.argv++) {
const char *arg = args.argv[0];
if (*arg != '-' || !arg[1]) {
argv[j++] = args.argv[0];
continue;
}
if (arg[1] != '-') {
args.opt = arg + 1;
do {
if (*args.opt == 'h')
usage(usagestr);
if (parse_short_opt(&args, options) < 0)
usage(usagestr);
} while (args.opt);
continue;
}
if (!arg[2]) { /* "--" */
if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
args.argc--;
args.argv++;
}
break;
}
if (!strcmp(arg + 2, "help"))
usage(usagestr);
if (parse_long_opt(&args, arg + 2, options))
usage(usagestr);
}
memmove(argv + j, args.argv, args.argc * sizeof(*argv));
argv[j + args.argc] = NULL;
return j + args.argc;
}
|
