RealView Compilation Tools - ARM Information Center

Standard C Implementation Definition
Note
• A whitespace character is any character where the result of isspace() is true.
• A double quote or backslash character \ inside double quotes must be preceded
by a backslash character.
• An input/output redirection is not recognized inside double quotes.
Interactive device
In a non hosted implementation of the ARM C library, the term interactive device might
be meaningless. The generic ARM C library supports a pair of devices, both called :tt,
intended to handle keyboard input and VDU screen output. In the generic
implementation:
• no buffering is done on any stream connected to :tt unless input/output
redirection has occurred
• if input/output redirection other than to :tt has occurred, full file buffering is used
except that line buffering is used if both stdout and stderr were redirected to the
same file.
Redirecting standard input, output, and error streams
Using the generic ARM C library, the standard input, output and error streams can be
redirected at runtime. For example, if mycopy is a program running on a host debugger
that copies the standard input to the standard output, the following line runs the
program:
mycopy < infile > outfile 2> errfile
and redirects the files as follows:
stdin
stdout
stderr
The standard input stream is redirected to infile.
The standard output stream is redirected to outfile.
The standard error stream is redirected to errfile.
The permitted redirections are:
0< filename Reads stdin from filename.
< filename Reads stdin from filename.
1> filename Writes stdout to filename.
B-4 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C
Non-Confidential,
ID101213