stdio.cdl

ecos实时嵌入式操作系统

                (para 7.9.1), and says it must be at least 256
                (para 7.9.2)."
        }
        
        cdl_option CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF {
            display       "setbuf()/setvbuf() allows dynamic setting"
            default_value 1
            description   "
                This option controls whether I/O buffers are
                implemented dynamically within the stdio
                implementation. Otherwise they will be static,
                and cannot be changed by setbuf()/setvbuf(). If
                they are static (i.e. this option is disabled),
                any attempt to use an arbitrary buffer size, or
                to pass a user-supplied buffer to setbuf() or
                setvbuf() will fail - the buffer is implemented
                internally as a static array taking the size
                of the configuration option BUFSIZ. The only
                exception is if a user buffer is not supplied,
                and the buffer size requested is less than
                BUFSIZ. In this case, the buffer will
                be configured to only use that amount of
                buffering. However the unused memory left over
                will NOT be freed. If this option is enabled,
		then setvbuf() can be used to assign a user supplied
                buffer to the stream.
                Either setting can be considered to
                be compliant with the ISO C standard."
        }

        cdl_option CYGSEM_LIBC_STDIO_SETVBUF_MALLOC {
            display       "setbuf()/setvbuf() uses malloc()"
            requires      CYGINT_ISO_MALLOC
            requires      CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF
            default_value { 0 != CYGINT_ISO_MALLOC }
            description   "
		This option controls whether buffers set by setbuf() and
		setvbuf() may be allocated using malloc()."
        }

    }
    # Define BUFSIZ with same value as ..._BUFSIZE or 0
    cdl_option BUFSIZ {
        display       "Default buffer size (BUFSIZ)"
        flavor        data
        calculated    CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO \
                       ? "CYGNUM_LIBC_STDIO_BUFSIZE" : 0
    }
    
    cdl_option CYGFUN_LIBC_STDIO_ungetc {
        display       "Support for ungetc()"
        default_value   1
        description   "
            This option controls whether ungetc() is
            supported. If not, then some space can be
            saved, and speed is improved. Note that you
            MUST have this defined if you want to use the
            scanf() family of functions."
    }
    
    cdl_option CYGPKG_LIBC_STDIO_OPEN {
        display       "Dynamic opening/closing of files"
        requires      CYGINT_ISO_MALLOC
        implements    CYGINT_ISO_STDIO_POSIX_FDFUNCS
        default_value { 0 != CYGINT_ISO_MALLOC }
        description   "
            fopen() and fclose() use dynamic memory
            allocation routines to allocate memory for
            new FILE structure pointers. If a malloc
            implementation is available, this option
            may be enabled to use
            fopen() and fclose(). If disabled, only the
            default console streams - stdin, stdout and
            stderr - will be available."
    }
    
    cdl_option CYGDAT_LIBC_STDIO_DEFAULT_CONSOLE {
        display       "Default console device"
        flavor        data
        default_value CYGDAT_IO_SERIAL_TTY_CONSOLE
        description   "
            This option allows you to choose the
            default console device. In the current
            implementation, all these devices begin
            with the prefix /dev/ and are followed by
            the name of a device. The name of the device
            depends on the device drivers you have
            configured in your system. For example,
            /dev/ttydiag could be the HAL diagnostic output
            pseudo-device, or /dev/tty0 could be your
            first serial driver, depending on your
            configuration."
    }
    
    cdl_component CYGPKG_LIBC_STDIO_FLOATING_POINT {
        display       "Floating point support"
        flavor        none
        description   "
            This component allows floating point support
            to be enabled in certain standard I/O
            functions."
    
        cdl_option CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT {
            display       "printf() family"
            requires      CYGPKG_LIBM
            default_value { 0 != CYGPKG_LIBM }
            description   "
                This option enables the use of floating point
                number output in the printf() family (i.e.
                printf(), sprintf(), vprintf(), etc.) of
                functions. A substantial amount of code space
                can be saved if this option is disabled. If it
                is disabled then floating point specifiers
                (%e, %f, %g) are ignored, and nothing is
                output."
        }
    
        cdl_option CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT {
            display       "scanf() family"
            requires      CYGPKG_LIBM
            requires      CYGINT_ISO_STDLIB_STRCONV_FLOAT
            default_value { 0 != CYGPKG_LIBM &&
                            0 != CYGINT_ISO_STDLIB_STRCONV_FLOAT }
            description   "
                This option enables the use of floating point
                number conversion in the scanf() family (i.e.
                scanf(), sscanf(), vscanf(), etc.) of
                functions. A substantial amount of code space
                can be saved if this option is disabled. If it
                is disabled then floating point specifiers
                (%e, %f, %g) are ignored, and nothing is
                converted."
        }
    }
    
    cdl_option CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS {
        display       "Thread safe I/O streams"
        doc           ref/libc-thread-safety.html
        requires      CYGPKG_KERNEL
        default_value { 0 != CYGPKG_KERNEL }
        description   "
            This option controls whether standard I/O streams
            are thread-safe. Having this option set allows
            the streams to be locked when accessed by
            multiple threads simultaneously."
    }
    

# ====================================================================

    cdl_component CYGPKG_LIBC_STDIO_OPTIONS {
        display "C library stdio functions build options"
        flavor  none
        no_define
        description   "
	    Package specific build options including control over
	    compiler flags used only in building this package,
	    and details of which tests are built."


        cdl_option CYGPKG_LIBC_STDIO_CFLAGS_ADD {
            display "Additional compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the C library. These flags are used in addition
                to the set of global flags."
        }

        cdl_option CYGPKG_LIBC_STDIO_CFLAGS_REMOVE {
            display "Suppressed compiler flags"
            flavor  data
            no_define
            default_value { "" }
            description   "
                This option modifies the set of compiler flags for
                building the C library. These flags are removed from
                the set of global flags if present."
        }

        cdl_option CYGPKG_LIBC_STDIO_TESTS {
            display "C library stdio function tests"
            flavor  data
            no_define
            calculated { "tests/sprintf1 tests/sprintf2 tests/sscanf tests/stdiooutput" }
            description   "
                This option specifies the set of tests for the C library
                stdio functions."
        }
    }

# ====================================================================

    cdl_option CYGPKG_LIBC_STDIO_FILEIO {
	display "Enable use of FILEIO package for IO operations."
	active_if CYGPKG_IO_FILEIO
	requires CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
	calculated 1
    }
}

# ====================================================================
# EOF stdio.cdl