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Added device_find_child_by_tag helper function.

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This commit is contained in:
Curt Coder 2009-09-14 12:28:14 +00:00
parent a5c60e89b2
commit d14a2d2c32
2 changed files with 24 additions and 0 deletions
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21
src/emu/devintrf.c
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@ -360,6 +360,27 @@ const device_config *device_list_find_by_tag(const device_config *listhead, cons
}
/*-------------------------------------------------
device_find_child_by_tag - retrieve a child
device configuration based on a tag
-------------------------------------------------*/
const device_config *device_find_child_by_tag(const device_config *owner, const char *tag)
{
astring *tempstring;
const device_config *child;
assert(owner != NULL);
assert(tag != NULL);
tempstring = astring_alloc();
child = device_list_find_by_tag(owner->machine->config->devicelist, device_build_tag(tempstring, owner, tag));
astring_free(tempstring);
return child;
}
/*-------------------------------------------------
device_list_index - return the index of a
device based on its type and tag;

3
src/emu/devintrf.h
View File

@ -367,6 +367,9 @@ const device_config *device_list_next(const device_config *prevdevice, device_ty
/* retrieve a device configuration based on a tag */
const device_config *device_list_find_by_tag(const device_config *listhead, const char *tag);
/* retrieve a child device configuration based on a tag */
const device_config *device_find_child_by_tag(const device_config *owner, const char *tag);
/* return the index of a device based on its type and tag; DEVICE_TYPE_WILDCARD is allowed */
int device_list_index(const device_config *listhead, device_type type, const char *tag);