stdio.cdl

eCos1.31版

# ====================================================================
#
#      stdio.cdl
#
#      C library stdio related configuration data
#
# ====================================================================
#####COPYRIGHTBEGIN####
#                                                                          
# -------------------------------------------                              
# The contents of this file are subject to the Red Hat eCos Public License 
# Version 1.1 (the "License"); you may not use this file except in         
# compliance with the License.  You may obtain a copy of the License at    
# http://www.redhat.com/                                                   
#                                                                          
# Software distributed under the License is distributed on an "AS IS"      
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
# License for the specific language governing rights and limitations under 
# the License.                                                             
#                                                                          
# The Original Code is eCos - Embedded Configurable Operating System,      
# released September 30, 1998.                                             
#                                                                          
# The Initial Developer of the Original Code is Red Hat.                   
# Portions created by Red Hat are                                          
# Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
# All Rights Reserved.                                                     
# -------------------------------------------                              
#                                                                          
#####COPYRIGHTEND####
# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):      jskov
# Original data:  jlarmour
# Contributors:
# Date:           1999-07-06
#
#####DESCRIPTIONEND####
#
# ====================================================================


cdl_option CYGIMP_LIBC_STDIO_INLINES {
    display       "Inline versions of <stdio.h> functions"
    default_value 1
    description   "
        This option chooses whether some of the
        particularly simple functions from
        <stdio.h> are available as inline
        functions. This may improve performance, and as
        the functions are small, may even improve code
        size."
}

cdl_option FOPEN_MAX {
    display       "Permitted number of open files"
    flavor        data
    legal_values  3 to 0x7fffffff
    default_value 8
    description   "
        This option controls the guaranteed minimum
        number of simultaneously open files. The ISO
        C standard requires it to be defined (para
        7.9.1), and if strictly compliant, it must be
        at least 8 (para 7.9.3). In practice it can be
        as low as 3 - for stdin, stdout and stderr."
}

cdl_option FILENAME_MAX {
    display       "Maximum length of filename"
    flavor        data
    legal_values  1 to 0x7fffffff
    default_value 16
    description   "
        This option defines the maximum allowed size of
        a filename in characters. The ISO C standard
        requires it to be defined (para 7.9.1)."
}

cdl_option L_tmpnam {
    display       "Maximum length of filenames for temporary files"
    flavor        data
    legal_values  1 to 0x7fffffff
    default_value 16
    description   "
        This option defines the maximum allowed size of
        filenames for temporary files as generated by
        tmpnam(). It is measured in characters, and the
        ISO C standard requires it to be defined (para 
        7.9.1)."
}

cdl_option TMP_MAX {
    display       "Unique file names generated by tmpnam()"
    flavor        data
    legal_values  0 to 0x7fffffff
    default_value 0
    description   "
        This option defines the minimum number of
        unique file names generated by tmpnam(). The
        ISO C standard requires it to be defined (para
        7.9.1)."
}

cdl_component CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO {
    display       "Buffered I/O"
    flavor        bool
    default_value 1 
    description   "
        This option controls whether input/output
        through the <stdio.h> functions is buffered.
        This may save some memory per file. It
        is equivalent to putting every file into
        non-buffered mode (_IONBF) through setvbuf(),
        except now it can never be altered back to
        buffered mode. Disabling buffering is strictly 
        non-compliant with the ISO C standard."

    cdl_option CYGNUM_LIBC_STDIO_BUFSIZE {
        display        "Default buffer size"
        flavor         data
        legal_values   1 to 0x7fffffff
        default_value  256
        description    "
            This option defines the default size of buffer
            used with calls to setbuf(), and is the default
            size for buffered streams that have not had
            either setbuf() or setvbuf() invoked on them.
            It is exactly equivalent to the standard
            constant BUFSIZ, except that it is 0 if
            CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO is disabled.
            The ISO C standard requires this to be defined
            (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() uses malloc()"
        requires      CYGPKG_LIBC_MALLOC
        default_value 0
        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 of 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 CYGPKG_LIBC_MALLOC must also
            be enabled. Either setting can be considered to
            be compliant with the ISO C standard."
    }
}
# 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      CYGPKG_LIBC_MALLOC
    default_value 1
    description   "
        fopen() and fclose() use dynamic memory
        allocation routines to allocate memory for
        new FILE structure pointers. This option,
        along with CYGPKG_LIBC_MALLOC, should 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 {"\"/dev/ttydiag\""}
    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 1
        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      CYGFUN_LIBC_strtod
        default_value 1
        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"
    requires      CYGPKG_KERNEL
    default_value 1
    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."
}