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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
|
/*
macros.c - a simple macro expander
Copyright (c) 2010, 2014 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vppinfra/macros.h>
static inline int
macro_isalnum (i8 c)
{
if ((c >= 'A' && c <= 'Z')
|| (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (c == '_'))
return 1;
return 0;
}
static i8 *
builtin_eval (macro_main_t * mm, i8 * varname, i32 complain)
{
uword *p;
i8 *(*fp) (macro_main_t *, i32);
p = hash_get_mem (mm->the_builtin_eval_hash, varname);
if (p == 0)
return 0;
fp = (void *) (p[0]);
return (*fp) (mm, complain);
}
int
clib_macro_unset (macro_main_t * mm, char *name)
{
hash_pair_t *p;
u8 *key, *value;
p = hash_get_pair (mm->the_value_table_hash, name);
if (p == 0)
return 1;
key = (u8 *) (p->key);
value = (u8 *) (p->value[0]);
hash_unset_mem (mm->the_value_table_hash, name);
vec_free (value);
vec_free (key);
return 0;
}
int
clib_macro_set_value (macro_main_t * mm, char *name, char *value)
{
u8 *key_copy, *value_copy;
int rv;
rv = clib_macro_unset (mm, name);
key_copy = format (0, "%s%c", name, 0);
value_copy = format (0, "%s%c", value, 0);
hash_set_mem (mm->the_value_table_hash, key_copy, value_copy);
return rv;
}
i8 *
clib_macro_get_value (macro_main_t * mm, char *name)
{
uword *p;
p = hash_get_mem (mm->the_value_table_hash, name);
if (p)
return (i8 *) (p[0]);
else
return 0;
}
/*
* eval: takes a string, returns a vector.
* looks up $foobar in the variable table.
*/
i8 *
clib_macro_eval (macro_main_t * mm, i8 * s, i32 complain)
{
i8 *rv = 0;
i8 *varname, *varvalue;
i8 *ts;
while (*s)
{
switch (*s)
{
case '\\':
s++;
/* fallthrough */
default:
vec_add1 (rv, *s);
s++;
break;
case '$':
s++;
varname = 0;
/*
* Make vector with variable name in it.
*/
while (*s && (macro_isalnum (*s) || (*s == '_') || (*s == '(')))
{
/* handle $(foo) */
if (*s == '(')
{
s++; /* skip '(' */
while (*s && *s != ')')
{
vec_add1 (varname, *s);
s++;
}
if (*s)
s++; /* skip ')' */
break;
}
vec_add1 (varname, *s);
s++;
}
/* null terminate */
vec_add1 (varname, 0);
/* Look for a builtin, e.g. $my_hostname */
if (!(varvalue = builtin_eval (mm, varname, complain)))
{
/* Look in value table */
if (!varvalue)
{
i8 *tmp = clib_macro_get_value (mm, (char *) varname);
if (tmp)
varvalue = (i8 *) format (0, "%s%c", tmp, 0);
}
#ifdef CLIB_UNIX
/* Look in environment. */
if (!varvalue)
{
char *tmp = getenv ((char *) varname);
if (tmp)
varvalue = (i8 *) format (0, "%s%c", tmp, 0);
}
#endif /* CLIB_UNIX */
}
if (varvalue)
{
/* recursively evaluate */
ts = clib_macro_eval (mm, varvalue, complain);
vec_free (varvalue);
/* add results to answer */
vec_append (rv, ts);
/* Remove NULL termination or the results are sad */
_vec_len (rv) = vec_len (rv) - 1;
vec_free (ts);
}
else
{
if (complain)
clib_warning ("Undefined Variable Reference: %s\n", varname);
vec_append (rv, format (0, "UNSET "));
_vec_len (rv) = vec_len (rv) - 1;
}
vec_free (varname);
}
}
vec_add1 (rv, 0);
return (rv);
}
/*
* eval: takes a string, returns a vector.
* looks up $foobar in the variable table.
*/
i8 *
clib_macro_eval_dollar (macro_main_t * mm, i8 * s, i32 complain)
{
i8 *s2;
i8 *rv;
s2 = (i8 *) format (0, "$(%s)%c", s, 0);
rv = clib_macro_eval (mm, s2, complain);
vec_free (s2);
return (rv);
}
void
clib_macro_add_builtin (macro_main_t * mm, char *name, void *eval_fn)
{
hash_set_mem (mm->the_builtin_eval_hash, name, (uword) eval_fn);
}
#ifdef CLIB_UNIX
static i8 *
eval_hostname (macro_main_t * mm, i32 complain)
{
char tmp[128];
if (gethostname (tmp, sizeof (tmp)))
return ((i8 *) format (0, "gethostname-error%c", 0));
return ((i8 *) format (0, "%s%c", tmp, 0));
}
#endif
void
clib_macro_init (macro_main_t * mm)
{
if (mm->the_builtin_eval_hash != 0)
{
clib_warning ("mm %p already initialized", mm);
return;
}
mm->the_builtin_eval_hash = hash_create_string (0, sizeof (uword));
mm->the_value_table_hash = hash_create_string (0, sizeof (uword));
#ifdef CLIB_UNIX
hash_set_mem (mm->the_builtin_eval_hash, "hostname", (uword) eval_hostname);
#endif
}
void
clib_macro_free (macro_main_t * mm)
{
hash_pair_t *p;
u8 **strings_to_free = 0;
int i;
hash_free (mm->the_builtin_eval_hash);
/* *INDENT-OFF* */
hash_foreach_pair (p, mm->the_value_table_hash,
({
vec_add1 (strings_to_free, (u8 *) (p->key));
vec_add1 (strings_to_free, (u8 *) (p->value[0]));
}));
/* *INDENT-ON* */
for (i = 0; i < vec_len (strings_to_free); i++)
vec_free (strings_to_free[i]);
vec_free (strings_to_free);
hash_free (mm->the_value_table_hash);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
