Epson S5U1C17001C, Руководство пользователя

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6-14
EPSOn
S5U1C17001C ManUal
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
6 C COMPilEr
6.5 filter function for Shift JiS Code
Description of function
The original GNU preprocessor/compiler is not fully compatible with the Shift JIS code (hereafter written as the
“SJIS code”). This means that for an SJIS character code like “ ” (0x945c), the “0x5c” part of the code will be
incorrectly judged as a line connector (\);the character code will not be processed correctly.
Example:
i_Val = 0;
//
i_Val = 1;
←
This line is joined to the above line and processed as a comment.
To prevent such errors, the preprocessor/compiler in package versions 1.5.0 and later incorporates a function to
filter SJIS codes.
When the code “0x5c” is encountered, this filter function checks one byte immediately before that code and
determines whether “0x5c” is a line connector (‘\’) or the second byte of an SJIS code.
If the function determines the code constitutes the second byte of an SJIS code, it performs a process to prevent
“0x5c” from being processed as a line connector (‘\’).
This function is compatible with the following files:
• C source files
• Header files included from C files
• Assembly source files
• Header files included from assembly source files
Specify the -mno-sjis-filt option to disable this filter option.
notes
• The -traditional-cpp option is not supported but is available in the preprocessor. The filter function will not
operate properly if this option is specified while building a project.
The -traditional-cpp option is designed to execute a preprocess in accordance with a rule in place before ISO
specifications were established.
• If the filter process is enabled, the output of code for a wide character (2-byte) enclosed in single quotation
marks (‘) will differ from that output by versions before 1.5.0.
The prefix “L” must be added to ensure correct output.
Example:
Inserting a wide character (2-byte) “
” (SJIS code: 0x8bf3)
• When a version before 1.5.0 is used or when the -mno-sjis-filt option is specified in versions 1.5.0 or later
int i_Val =
‘ ’
;
→
i_Val is replaced by 0x8bf3
• When the -mno-sjis-filt option is not specified in versions 1.5.0 or later
int i_Val = L
’ ’
;
→
i_Val is replaced by 0x8bf3 if the prefix “L” is specified. If the prefix
“L” is not specified, i_Val is replaced by 0xfff3.