char *
Var_Parse(const char *str, /* The string to parse */
SymTable *ctxt, /* The context for the variable */
bool err, /* true if undefined variables are an error */
size_t *lengthPtr, /* OUT: The length of the specification */
bool *freePtr) /* OUT: true if caller should free result */
{
const char *tstr;
struct Name name;
char *val;
uint32_t k;
int idx;
bool has_modifier;
*freePtr = false;
tstr = str;
if (str[1] == 0) {
*lengthPtr = 1;
*freePtr = false;
return err ? var_Error : varNoError;
}
has_modifier = parse_base_variable_name(&tstr, &name, ctxt);
idx = classify_var(name.s, &name.e, &k);
val = get_expanded_value(name.s, name.e, idx, k, ctxt, err, freePtr);
if (has_modifier) {
val = VarModifiers_Apply(val, &name, ctxt, err, freePtr,
&tstr, str[1]);
}
if (val == NULL) {
val = err ? var_Error : varNoError;
/* If it comes from a dynamic source, and it doesn't have
* a context, copy the spec instead.
* Specifically, this make allows constructs like:
* target.o: $*.c
* Absence of a context means "parsing". But these can't
* be expanded during parsing, to be consistent with the
* way .SUFFIXES work.
* .SUFFIXES may be added/reset/removed during parsing,
* but in the end, the final list is what's considered for
* handling targets. So those dynamic variables must be
* handled lazily too.
*/
if (idx != GLOBAL_INDEX) {
if (ctxt == NULL) {
*freePtr = true;
val = Str_dupi(str, tstr);
} else {
bad_dynamic_variable(idx);
}
}
}
VarName_Free(&name);
*lengthPtr = tstr - str;
return val;
}
char *
Var_Parse(const char *str, /* The string to parse */
SymTable *ctxt, /* The context for the variable */
bool err, /* true if undefined variables are an error */
size_t *lengthPtr, /* OUT: The length of the specification */
bool *freePtr) /* OUT: true if caller should free result */
{
const char *tstr;
struct Name name;
char *val;
uint32_t k;
int idx;
bool has_modifier;
*freePtr = false;
tstr = str;
has_modifier = parse_base_variable_name(&tstr, &name, ctxt);
idx = classify_var(name.s, &name.e, &k);
val = get_expanded_value(name.s, name.e, idx, k, ctxt, err, freePtr);
if (has_modifier) {
val = VarModifiers_Apply(val, &name, ctxt, err, freePtr,
&tstr, str[1]);
}
if (val == NULL) {
val = err ? var_Error : varNoError;
/* Dynamic source */
if (idx != GLOBAL_INDEX) {
/* can't be expanded for now: copy the spec instead. */
if (ctxt == NULL) {
*freePtr = true;
val = Str_dupi(str, tstr);
} else {
/* somehow, this should have been expanded already. */
GNode *n;
/* XXX */
n = (GNode *)(((char *)ctxt) -
offsetof(GNode, context));
if (idx >= LOCAL_SIZE)
idx = EXTENDED2SIMPLE(idx);
switch(idx) {
case IMPSRC_INDEX:
Fatal(
"Using $< in a non-suffix rule context is a GNUmake idiom (line %lu of %s)",
n->origin.lineno, n->origin.fname);
break;
default:
Error(
"Using undefined dynamic variable $%s (line %lu of %s)",
varnames[idx], n->origin.lineno,
n->origin.fname);
break;
}
}
}
}
VarName_Free(&name);
*lengthPtr = tstr - str;
return val;
}