X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flibpspp%2Fi18n.h;h=a933b81b629f44d5c24c7a0803981927307acbb7;hb=c69c407c02121e63bdadf6efe55e4211abd03ad2;hp=e2663a022094b65e5fc5f2aa6e2d303508c2a83b;hpb=f550aee00a62fe1d8baf62d83cd7efef6cc2ee92;p=pspp-builds.git diff --git a/src/libpspp/i18n.h b/src/libpspp/i18n.h index e2663a02..a933b81b 100644 --- a/src/libpspp/i18n.h +++ b/src/libpspp/i18n.h @@ -1,5 +1,5 @@ /* PSPP - a program for statistical analysis. - Copyright (C) 2006 Free Software Foundation, Inc. + Copyright (C) 2006, 2010, 2011 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -18,44 +18,47 @@ #define I18N_H #include +#include void i18n_done (void); void i18n_init (void); #define UTF8 "UTF-8" -struct pool; - - -/* -Converts the string TEXT, which should be encoded in FROM-encoding, to a -dynamically allocated string in TO-encoding. Any characters which cannot -be converted will be represented by '?'. +/* The encoding of literal strings in PSPP source code, as seen at execution + time. In fact this is likely to be some extended ASCII encoding, such as + UTF-8 or ISO-8859-1, but ASCII is adequate for our purposes. */ +#define C_ENCODING "ASCII" -LENGTH should be the length of the string or -1, if null terminated. +struct pool; -The returned string will be allocated on POOL. +char recode_byte (const char *to, const char *from, char); -This function's behaviour differs from that of g_convert_with_fallback provided -by GLib. The GLib function will fail (returns NULL) if any part of the input -string is not valid in the declared input encoding. This function however perseveres -even in the presence of badly encoded input. -*/ +char *recode_string (const char *to, const char *from, + const char *text, int len); char *recode_string_pool (const char *to, const char *from, - const char *text, int length, struct pool *pool); + const char *text, int length, struct pool *); +struct substring recode_substring_pool (const char *to, const char *from, + struct substring text, struct pool *); +size_t recode_string_len (const char *to, const char *from, + const char *text, int len); +char *utf8_encoding_trunc (const char *, const char *encoding, + size_t max_len); +size_t utf8_encoding_trunc_len (const char *, const char *encoding, + size_t max_len); -/* Similar to recode_string_pool, but allocates the returned value on the heap instead of - in a pool. It is the caller's responsibility to free the returned value. */ -char *recode_string (const char *to, const char *from, - const char *text, int len); +char *utf8_encoding_concat (const char *head, const char *tail, + const char *encoding, size_t max_len); +size_t utf8_encoding_concat_len (const char *head, const char *tail, + const char *encoding, size_t max_len); +char *utf8_to_filename (const char *filename); +char *filename_to_utf8 (const char *filename); bool valid_encoding (const char *enc); -/* Return the decimal separator according to the - system locale */ char get_system_decimal (void); const char * get_default_encoding (void); @@ -63,5 +66,73 @@ void set_default_encoding (const char *enc); bool set_encoding_from_locale (const char *loc); +const char *uc_name (ucs4_t uc, char buffer[16]); + +/* Information about character encodings. */ + +/* ISO C defines a set of characters that a C implementation must support at + runtime, called the C basic execution character set, which consists of the + following characters: + + A B C D E F G H I J K L M + N O P Q R S T U V W X Y Z + a b c d e f g h i j k l m + n o p q r s t u v w x y z + 0 1 2 3 4 5 6 7 8 9 + ! " # % & ' ( ) * + , - . / : + ; < = > ? [ \ ] ^ _ { | } ~ + space \a \b \r \n \t \v \f \0 + + The following is true of every member of the C basic execution character + set in all "reasonable" encodings: + + 1. Every member of the C basic character set is encoded. + + 2. Every member of the C basic character set has the same width in + bytes, called the "unit width". Most encodings have a unit width of + 1 byte, but UCS-2 and UTF-16 have a unit width of 2 bytes and UCS-4 + and UTF-32 have a unit width of 4 bytes. + + 3. In a stateful encoding, the encoding of members of the C basic + character set does not vary with shift state. + + 4. When a string is read unit-by-unit, a unit that has the encoded value + of a member of the C basic character set, EXCEPT FOR THE DECIMAL + DIGITS, always represents that member. That is, if the encoding has + multi-unit characters, the units that encode the C basic character + set are never part of a multi-unit character. + + The exception for decimal digits is due to GB18030, which uses + decimal digits as part of multi-byte encodings. + + All 8-bit and wider encodings that I have been able to find follow these + rules. 7-bit and narrower encodings (e.g. UTF-7) do not. I'm not too + concerned about that. */ + +#include + +/* Maximum width of a unit, in bytes. UTF-32 with 4-byte units is the widest + that I am aware of. */ +#define MAX_UNIT 4 + +/* Information about an encoding. */ +struct encoding_info + { + /* Encoding name. IANA says character set names may be up to 40 US-ASCII + characters. */ + char name[41]; + + /* True if this encoding has a unit width of 1 byte, and every character + used in ASCII text files has the same value in this encoding. */ + bool is_ascii_compatible; + + /* Character information. */ + int unit; /* Unit width, in bytes. */ + char cr[MAX_UNIT]; /* \r in encoding, 'unit' bytes long. */ + char lf[MAX_UNIT]; /* \n in encoding, 'unit' bytes long. */ + }; + +bool get_encoding_info (struct encoding_info *, const char *name); +bool is_encoding_ascii_compatible (const char *encoding); #endif /* i18n.h */