Refactor regex and implement UTF8 mode for GRegex

- with non-unicode byte to Private Use Area A mapping
- move all ifdefs to iregex.h file only

src/core/iregex-regexh.c

@@ -0,0 +1,101 @@
+#include "iregex.h"
+
+Regex *
+i_regex_new (const gchar *pattern,
+             GRegexCompileFlags compile_options,
+             GRegexMatchFlags match_options,
+             GError **error)
+{
+	Regex *regex;
+	char *errbuf;
+	int cflags;
+	int errcode, errbuf_len;
+
+	regex = g_new0(Regex, 1);
+	cflags = REG_EXTENDED;
+	if (compile_options & G_REGEX_CASELESS)
+		cflags |= REG_ICASE;
+	if (compile_options & G_REGEX_MULTILINE)
+		cflags |= REG_NEWLINE;
+	if (match_options & G_REGEX_MATCH_NOTBOL)
+		cflags |= REG_NOTBOL;
+	if (match_options & G_REGEX_MATCH_NOTEOL)
+		cflags |= REG_NOTEOL;
+
+	errcode = regcomp(regex, pattern, cflags);
+	if (errcode != 0) {
+		errbuf_len = regerror(errcode, regex, 0, 0);
+		errbuf = g_malloc(errbuf_len);
+		regerror(errcode, regex, errbuf, errbuf_len);
+		g_set_error(error, G_REGEX_ERROR, errcode, "%s", errbuf);
+		g_free(errbuf);
+		g_free(regex);
+		return NULL;
+	} else {
+		return regex;
+	}
+}
+
+void
+i_regex_unref (Regex *regex)
+{
+	regfree(regex);
+	g_free(regex);
+}
+
+gboolean
+i_regex_match (const Regex *regex,
+               const gchar *string,
+               GRegexMatchFlags match_options,
+               MatchInfo **match_info,
+               const gchar **new_string)
+{
+	int groups;
+	int eflags;
+
+	g_return_val_if_fail(regex != NULL, FALSE);
+
+	if (match_info != NULL) {
+		groups = 1 + regex->re_nsub;
+		*match_info = g_new0(MatchInfo, groups);
+	} else {
+		groups = 0;
+	}
+
+	eflags = 0;
+	if (match_options & G_REGEX_MATCH_NOTBOL)
+		eflags |= REG_NOTBOL;
+	if (match_options & G_REGEX_MATCH_NOTEOL)
+		eflags |= REG_NOTEOL;
+
+	return regexec(regex, string, groups, groups ? *match_info : NULL, eflags) == 0;
+}
+
+gboolean
+i_match_info_fetch_pos (const MatchInfo *match_info,
+                        gint match_num,
+                        gint *start_pos,
+                        gint *end_pos,
+                        const gchar *new_string)
+{
+	if (start_pos != NULL)
+		*start_pos = match_info[match_num].rm_so;
+	if (end_pos != NULL)
+		*end_pos = match_info[match_num].rm_eo;
+
+	return TRUE;
+}
+
+gboolean
+i_match_info_matches (const MatchInfo *match_info)
+{
+	g_return_val_if_fail(match_info != NULL, FALSE);
+
+	return match_info[0].rm_so != -1;
+}
+
+void
+i_match_info_free (MatchInfo *match_info)
+{
+	g_free(match_info);
+}