1 files changed, 320 insertions, 0 deletions
diff --git a/src/backend/tsearch/ts_locale.c b/src/backend/tsearch/ts_locale.c
new file mode 100644
index 0000000..3a475a0
--- /dev/null
+++ b/src/backend/tsearch/ts_locale.c
@@ -0,0 +1,320 @@
+/*-------------------------------------------------------------------------
+ *
+ * ts_locale.c
+ *		locale compatibility layer for tsearch
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/tsearch/ts_locale.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "catalog/pg_collation.h"
+#include "common/string.h"
+#include "storage/fd.h"
+#include "tsearch/ts_locale.h"
+#include "tsearch/ts_public.h"
+
+static void tsearch_readline_callback(void *arg);
+
+
+/*
+ * The reason these functions use a 3-wchar_t output buffer, not 2 as you
+ * might expect, is that on Windows "wchar_t" is 16 bits and what we'll be
+ * getting from char2wchar() is UTF16 not UTF32.  A single input character
+ * may therefore produce a surrogate pair rather than just one wchar_t;
+ * we also need room for a trailing null.  When we do get a surrogate pair,
+ * we pass just the first code to iswdigit() etc, so that these functions will
+ * always return false for characters outside the Basic Multilingual Plane.
+ */
+#define WC_BUF_LEN  3
+
+int
+t_isdigit(const char *ptr)
+{
+	int			clen = pg_mblen(ptr);
+	wchar_t		character[WC_BUF_LEN];
+	pg_locale_t mylocale = 0;	/* TODO */
+
+	if (clen == 1 || database_ctype_is_c)
+		return isdigit(TOUCHAR(ptr));
+
+	char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
+
+	return iswdigit((wint_t) character[0]);
+}
+
+int
+t_isspace(const char *ptr)
+{
+	int			clen = pg_mblen(ptr);
+	wchar_t		character[WC_BUF_LEN];
+	pg_locale_t mylocale = 0;	/* TODO */
+
+	if (clen == 1 || database_ctype_is_c)
+		return isspace(TOUCHAR(ptr));
+
+	char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
+
+	return iswspace((wint_t) character[0]);
+}
+
+int
+t_isalpha(const char *ptr)
+{
+	int			clen = pg_mblen(ptr);
+	wchar_t		character[WC_BUF_LEN];
+	pg_locale_t mylocale = 0;	/* TODO */
+
+	if (clen == 1 || database_ctype_is_c)
+		return isalpha(TOUCHAR(ptr));
+
+	char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
+
+	return iswalpha((wint_t) character[0]);
+}
+
+int
+t_isprint(const char *ptr)
+{
+	int			clen = pg_mblen(ptr);
+	wchar_t		character[WC_BUF_LEN];
+	pg_locale_t mylocale = 0;	/* TODO */
+
+	if (clen == 1 || database_ctype_is_c)
+		return isprint(TOUCHAR(ptr));
+
+	char2wchar(character, WC_BUF_LEN, ptr, clen, mylocale);
+
+	return iswprint((wint_t) character[0]);
+}
+
+
+/*
+ * Set up to read a file using tsearch_readline().  This facility is
+ * better than just reading the file directly because it provides error
+ * context pointing to the specific line where a problem is detected.
+ *
+ * Expected usage is:
+ *
+ *		tsearch_readline_state trst;
+ *
+ *		if (!tsearch_readline_begin(&trst, filename))
+ *			ereport(ERROR,
+ *					(errcode(ERRCODE_CONFIG_FILE_ERROR),
+ *					 errmsg("could not open stop-word file \"%s\": %m",
+ *							filename)));
+ *		while ((line = tsearch_readline(&trst)) != NULL)
+ *			process line;
+ *		tsearch_readline_end(&trst);
+ *
+ * Note that the caller supplies the ereport() for file open failure;
+ * this is so that a custom message can be provided.  The filename string
+ * passed to tsearch_readline_begin() must remain valid through
+ * tsearch_readline_end().
+ */
+bool
+tsearch_readline_begin(tsearch_readline_state *stp,
+					   const char *filename)
+{
+	if ((stp->fp = AllocateFile(filename, "r")) == NULL)
+		return false;
+	stp->filename = filename;
+	stp->lineno = 0;
+	initStringInfo(&stp->buf);
+	stp->curline = NULL;
+	/* Setup error traceback support for ereport() */
+	stp->cb.callback = tsearch_readline_callback;
+	stp->cb.arg = (void *) stp;
+	stp->cb.previous = error_context_stack;
+	error_context_stack = &stp->cb;
+	return true;
+}
+
+/*
+ * Read the next line from a tsearch data file (expected to be in UTF-8), and
+ * convert it to database encoding if needed. The returned string is palloc'd.
+ * NULL return means EOF.
+ */
+char *
+tsearch_readline(tsearch_readline_state *stp)
+{
+	char	   *recoded;
+
+	/* Advance line number to use in error reports */
+	stp->lineno++;
+
+	/* Clear curline, it's no longer relevant */
+	if (stp->curline)
+	{
+		if (stp->curline != stp->buf.data)
+			pfree(stp->curline);
+		stp->curline = NULL;
+	}
+
+	/* Collect next line, if there is one */
+	if (!pg_get_line_buf(stp->fp, &stp->buf))
+		return NULL;
+
+	/* Validate the input as UTF-8, then convert to DB encoding if needed */
+	recoded = pg_any_to_server(stp->buf.data, stp->buf.len, PG_UTF8);
+
+	/* Save the correctly-encoded string for possible error reports */
+	stp->curline = recoded;		/* might be equal to buf.data */
+
+	/*
+	 * We always return a freshly pstrdup'd string.  This is clearly necessary
+	 * if pg_any_to_server() returned buf.data, and we need a second copy even
+	 * if encoding conversion did occur.  The caller is entitled to pfree the
+	 * returned string at any time, which would leave curline pointing to
+	 * recycled storage, causing problems if an error occurs after that point.
+	 * (It's preferable to return the result of pstrdup instead of the output
+	 * of pg_any_to_server, because the conversion result tends to be
+	 * over-allocated.  Since callers might save the result string directly
+	 * into a long-lived dictionary structure, we don't want it to be a larger
+	 * palloc chunk than necessary.  We'll reclaim the conversion result on
+	 * the next call.)
+	 */
+	return pstrdup(recoded);
+}
+
+/*
+ * Close down after reading a file with tsearch_readline()
+ */
+void
+tsearch_readline_end(tsearch_readline_state *stp)
+{
+	/* Suppress use of curline in any error reported below */
+	if (stp->curline)
+	{
+		if (stp->curline != stp->buf.data)
+			pfree(stp->curline);
+		stp->curline = NULL;
+	}
+
+	/* Release other resources */
+	pfree(stp->buf.data);
+	FreeFile(stp->fp);
+
+	/* Pop the error context stack */
+	error_context_stack = stp->cb.previous;
+}
+
+/*
+ * Error context callback for errors occurring while reading a tsearch
+ * configuration file.
+ */
+static void
+tsearch_readline_callback(void *arg)
+{
+	tsearch_readline_state *stp = (tsearch_readline_state *) arg;
+
+	/*
+	 * We can't include the text of the config line for errors that occur
+	 * during tsearch_readline() itself.  The major cause of such errors is
+	 * encoding violations, and we daren't try to print error messages
+	 * containing badly-encoded data.
+	 */
+	if (stp->curline)
+		errcontext("line %d of configuration file \"%s\": \"%s\"",
+				   stp->lineno,
+				   stp->filename,
+				   stp->curline);
+	else
+		errcontext("line %d of configuration file \"%s\"",
+				   stp->lineno,
+				   stp->filename);
+}
+
+
+/*
+ * lowerstr --- fold null-terminated string to lower case
+ *
+ * Returned string is palloc'd
+ */
+char *
+lowerstr(const char *str)
+{
+	return lowerstr_with_len(str, strlen(str));
+}
+
+/*
+ * lowerstr_with_len --- fold string to lower case
+ *
+ * Input string need not be null-terminated.
+ *
+ * Returned string is palloc'd
+ */
+char *
+lowerstr_with_len(const char *str, int len)
+{
+	char	   *out;
+	pg_locale_t mylocale = 0;	/* TODO */
+
+	if (len == 0)
+		return pstrdup("");
+
+	/*
+	 * Use wide char code only when max encoding length > 1 and ctype != C.
+	 * Some operating systems fail with multi-byte encodings and a C locale.
+	 * Also, for a C locale there is no need to process as multibyte. From
+	 * backend/utils/adt/oracle_compat.c Teodor
+	 */
+	if (pg_database_encoding_max_length() > 1 && !database_ctype_is_c)
+	{
+		wchar_t    *wstr,
+				   *wptr;
+		int			wlen;
+
+		/*
+		 * alloc number of wchar_t for worst case, len contains number of
+		 * bytes >= number of characters and alloc 1 wchar_t for 0, because
+		 * wchar2char wants zero-terminated string
+		 */
+		wptr = wstr = (wchar_t *) palloc(sizeof(wchar_t) * (len + 1));
+
+		wlen = char2wchar(wstr, len + 1, str, len, mylocale);
+		Assert(wlen <= len);
+
+		while (*wptr)
+		{
+			*wptr = towlower((wint_t) *wptr);
+			wptr++;
+		}
+
+		/*
+		 * Alloc result string for worst case + '\0'
+		 */
+		len = pg_database_encoding_max_length() * wlen + 1;
+		out = (char *) palloc(len);
+
+		wlen = wchar2char(out, wstr, len, mylocale);
+
+		pfree(wstr);
+
+		if (wlen < 0)
+			ereport(ERROR,
+					(errcode(ERRCODE_CHARACTER_NOT_IN_REPERTOIRE),
+					 errmsg("conversion from wchar_t to server encoding failed: %m")));
+		Assert(wlen < len);
+	}
+	else
+	{
+		const char *ptr = str;
+		char	   *outptr;
+
+		outptr = out = (char *) palloc(sizeof(char) * (len + 1));
+		while ((ptr - str) < len && *ptr)
+		{
+			*outptr++ = tolower(TOUCHAR(ptr));
+			ptr++;
+		}
+		*outptr = '\0';
+	}
+
+	return out;
+}