I don't understand what the point of this code is?
&thread_ptr->buffer[0]
All references to arrays in C decay to a pointer so just use the much simpler
form:
thread_ptr->buffer
2020-04-29 2:27 PM, retired mainframer wrote:
The LY instruction is picking up the file descriptor (think DD name) so the
IO accesses the correct file.
The memcpy statement doesn't care what file the data came from. You are
copying whatever is currently in the buffer to reclen and it is obvious that
the buffer is at the start of your structure/class.
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On
Behalf Of Joseph Reichman
Sent: Tuesday, April 28, 2020 6:44 PM
To: [email protected]
Subject: Strange code Generation from XL\C Metal C
I am using a pointer to buffer to read in data the data name is
thread_ptr->buffer buffer is define char[2100]
Here is code when I call the read notice it bumps register 4 21000 bytes
to
get the address of buffer
_read(thread_ptr->fh, &thread_ptr->buffer[0], reclen);
L 2,@113thread_ptr
LY 4,21000(0,2) (*)threadstor.threadstor.fh
LLH 14,@123reclen
"IBMUSER.DBGR.SERVER(OPENFILE)" Page 68
R14
rce Statement HLASM R6.0 2020/04/28 21.34
L 0,#WSA_1
L 15,=V(@READ)
LA 1,224(,13) #MX_TEMP1
ST 4,224(,13) #MX_TEMP1
ST 2,228(,13) #MX_TEMP1
ST 14,232(,13) #MX_TEMP1
MVC 8(4,13),#NAB_1+4
SAC 0
BASR 14,15
SAC 512
Here is code where I am trying to copy pos 10 of buffer for 2 bytes notice
there is no LY for 21000 to get to buffer ?
memcpy(&reclen, &thread_ptr->buffer[10],2);
L 14,@113thread_ptr
CPYA 2,14
MVC @123reclen,10(14)
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