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The Fred Fish Collection 1.5
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ffcollection-1-5-1992-11.iso
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200-299
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ff290.lzh
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IPC
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IPC_Lib_Sources
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UtilIPC.c
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C/C++ Source or Header
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1989-12-11
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2KB
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59 lines
/********************************************************************
* *
* IPC Utilities module 89:4:17 *
* *
* Shared Library version *
* *
********************************************************************/
#include "IPCStruct.h"
/*
* -- MakeIPCId
*
* turns a 4-character string into a 32-bit ID value.
* -- Note: a string of less than 4 characters will be LEFT
* justified (high bits)
* -- more than 4 will be truncated.
*/
ULONG __asm MakeIPCId(register __a0 char *name)
{
ULONG temp=0;
int i;
for (i=4; i--; ) {
temp = (temp<<8) | *name;
if (*name) name++;
}
return temp;
}
/*
* -- FindIPCItem
*
* returns a pointer to the first item it finds in 'msg' that matches 'id',
* starting at 'item'; if 'item' is NULL, it starts at the first item.
* (Remember, if you are resuming a search from the last item found for
* another of the same name, to INCREMENT 'item' from the previous value:
* otherwise it will find the same item again!)
*/
struct IPCItem * __asm FindIPCItem(
register __a0 struct IPCMessage * msg,
register __d0 ULONG id,
register __a1 struct IPCItem * item)
{
int i;
if (item)
i = msg->ipc_ItemCount -(item - msg->ipc_Items);
else {
i = msg->ipc_ItemCount;
item = msg->ipc_Items;
}
for ( ;i--; item++ )
if (item->ii_Id == id) return item;
return NULL;
}