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parser: introduce symbol_find()

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Create a new helper function symbol_find() that determines whether
there exists a defined symbol having the given name.  It returns a
pointer to the symbol structure is returned if one exists, or a null
pointer otherwise.

Signed-off-by: Alex Elder <elder@linaro.org>
Message-Id: <20211001232338.769309-31-elder@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Alex Elder 2021-10-01 18:23:34 -05:00 committed by Bjorn Andersson
parent 734ecff5a5
commit b793b576ff
1 changed files with 17 additions and 13 deletions
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30
parser.c
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@ -119,10 +119,19 @@ struct symbol {
static struct list_head symbols = LIST_INIT(symbols);
static struct symbol *symbol_find(const char *name)
{
struct symbol *sym;
list_for_each_entry(sym, &symbols, node)
if (!strcmp(name, sym->name))
return sym;
return NULL;
}
static bool symbol_valid(const char *name)
{
const char *p = name;
struct symbol *sym;
char ch;
/* Symbol name must start with an alphabetic character */
@ -139,9 +148,8 @@ static bool symbol_valid(const char *name)
return 0;
/* Finally, symbol names must be unique */
list_for_each_entry(sym, &symbols, node)
if (!strcmp(name, sym->name))
return false;
if (symbol_find(name))
return false;
return true;
}
@ -233,10 +241,8 @@ static struct token yylex()
if (!token.str)
yyerror("strdup() failed in %s(), line %d\n",
__func__, __LINE__);
list_for_each_entry(sym, &symbols, node) {
if (strcmp(buf, sym->name))
continue;
sym = symbol_find(token.str);
if (sym) {
token.id = sym->token_id;
switch (token.id) {
case TOK_MESSAGE:
@ -247,14 +253,12 @@ static struct token yylex()
token.qmi_struct = sym->qmi_struct;
break;
default:
break;
break; /* Others just have id and string */
}
return token;
} else {
token.id = TOK_ID; /* Just an identifier */
}
token.id = TOK_ID;
return token;
} else if (isdigit(ch)) {
/* Determine base and valid character set */