/* 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
#ifndef I18N_H
#define I18N_H
-const char * get_pspp_locale (void);
-void set_pspp_locale (const char *locale);
-const char * get_pspp_charset (void);
+#include <stdbool.h>
+#include <unistr.h>
void i18n_done (void);
void i18n_init (void);
-enum conv_id
- {
- CONV_PSPP_TO_UTF8,
- CONV_SYSTEM_TO_PSPP,
- CONV_UTF8_TO_PSPP,
- n_CONV
- };
+#define UTF8 "UTF-8"
+
+/* 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"
+
+struct pool;
+
+char recode_byte (const char *to, const char *from, char);
+
+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 *);
+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);
-char * recode_string (enum conv_id how, 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);
+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]);
+\f
+/* 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 <stdbool.h>
+
+/* 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 */
projects / pspp-builds.git / blobdiff