HP 3000 Manuals HP 3000 Manuals
READX
NM and CM callable.
Reads an ASCII string from $STDINX into an array.
Syntax
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| |
| I16 CA I16V |
| length:=READX(message,msglength);|
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Functional Return
length 16-bit signed integer (assigned functional return)
The length of the ASCII string that was read. If
msglength is positive, the length specified is in
half words; if negative, the length specified is in
bytes.
Parameters
message character array (required)
Returns the ASCII characters that were read.
msglength 16-bit signed integer by value (required)
Returns the length of message. If msglength is
positive, it specifies the length in half words; if
negative, it specifies the length in bytes. When
the record is read, the first msglength characters
are input. If msglength is >= record size of
message, the entire record is transmitted.
NOTE Passing a value >message can cause user data corruption or a CCL
(1) bounds violation if the system could be corrupted by the call.
Operation Notes
The READX intrinsic reads an ASCII string from $STDINX into an array.
This is similar to calling the FREAD intrinsic against the file $STDINX.
However, the READX intrinsic is limited in its usefulness in that the
full capability of the file system is not available to you. For example,
FILE commands are not allowed. Also, you cannot use certain file
intrinsics because the filenum parameter, obtained from either the
FOPEN/HPFOPEN intrinsic, is not normally available to users of the READX
intrinsic.
Basic line editing, such as cancellation of lines and backspacing, are
performed automatically by the I/O driver. If the input device is a
terminal in full-duplex mode with the ECHO facility on, or if the
terminal is in half-duplex mode, the characters read are printed.
READX interprets EOD, EOF, or in a job, EOJ, JOB, or DATA as an
end-of-file indicator.
If $STDIN is redirected, only the file's actual EOF is interpreted as the
valid EOF indicator.
Condition Codes
CCE (2) Request granted.
CCG (0) An EOD, EOF, or in a job, EOJ, JOB, or DATA command
was encountered.
CCL (1) Request denied. A physical I/O error occurred.
Further error analysis through the FCHECK intrinsic
is not possible.
Related Information
Intrinsics None
Commands None
Manuals Accessing Files Programmer's Guide (32650-90017)