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-rw-r--r--src/vppinfra/macros.c266
1 files changed, 266 insertions, 0 deletions
diff --git a/src/vppinfra/macros.c b/src/vppinfra/macros.c
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+++ b/src/vppinfra/macros.c
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+/*
+ 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)
+ {
+ char *tmp = clib_macro_get_value (mm, varname);
+ if (tmp)
+ varvalue = (i8 *) format (0, "%s%c", tmp, 0);
+ }
+#ifdef CLIB_UNIX
+ /* Look in environment. */
+ if (!varvalue)
+ {
+ char *tmp = getenv (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:
+ */