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diff --git a/src/arabic.c b/src/arabic.c
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+++ b/src/arabic.c
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+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved by Bram Moolenaar
+ *
+ * Do ":help uganda" in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * arabic.c: functions for Arabic language
+ *
+ * Included by main.c, when FEAT_ARABIC & FEAT_GUI is defined.
+ *
+ * --
+ *
+ * Author: Nadim Shaikli & Isam Bayazidi
+ *
+ */
+
+static int A_is_a __ARGS((int cur_c));
+static int A_is_s __ARGS((int cur_c));
+static int A_is_f __ARGS((int cur_c));
+static int chg_c_a2s __ARGS((int cur_c));
+static int chg_c_a2i __ARGS((int cur_c));
+static int chg_c_a2m __ARGS((int cur_c));
+static int chg_c_a2f __ARGS((int cur_c));
+static int chg_c_i2m __ARGS((int cur_c));
+static int chg_c_f2m __ARGS((int cur_c));
+static int chg_c_laa2i __ARGS((int hid_c));
+static int chg_c_laa2f __ARGS((int hid_c));
+static int half_shape __ARGS((int c));
+static int A_firstc_laa __ARGS((int c1, int c));
+static int A_is_harakat __ARGS((int c));
+static int A_is_iso __ARGS((int c));
+static int A_is_formb __ARGS((int c));
+static int A_is_ok __ARGS((int c));
+static int A_is_valid __ARGS((int c));
+static int A_is_special __ARGS((int c));
+
+
+/*
+ * Returns True if c is an ISO-8859-6 shaped ARABIC letter (user entered)
+ */
+ static int
+A_is_a(cur_c)
+ int cur_c;
+{
+ switch (cur_c)
+ {
+ case a_HAMZA:
+ case a_ALEF_MADDA:
+ case a_ALEF_HAMZA_ABOVE:
+ case a_WAW_HAMZA:
+ case a_ALEF_HAMZA_BELOW:
+ case a_YEH_HAMZA:
+ case a_ALEF:
+ case a_BEH:
+ case a_TEH_MARBUTA:
+ case a_TEH:
+ case a_THEH:
+ case a_JEEM:
+ case a_HAH:
+ case a_KHAH:
+ case a_DAL:
+ case a_THAL:
+ case a_REH:
+ case a_ZAIN:
+ case a_SEEN:
+ case a_SHEEN:
+ case a_SAD:
+ case a_DAD:
+ case a_TAH:
+ case a_ZAH:
+ case a_AIN:
+ case a_GHAIN:
+ case a_TATWEEL:
+ case a_FEH:
+ case a_QAF:
+ case a_KAF:
+ case a_LAM:
+ case a_MEEM:
+ case a_NOON:
+ case a_HEH:
+ case a_WAW:
+ case a_ALEF_MAKSURA:
+ case a_YEH:
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+/*
+ * Returns True if c is an Isolated Form-B ARABIC letter
+ */
+ static int
+A_is_s(cur_c)
+ int cur_c;
+{
+ switch (cur_c)
+ {
+ case a_s_HAMZA:
+ case a_s_ALEF_MADDA:
+ case a_s_ALEF_HAMZA_ABOVE:
+ case a_s_WAW_HAMZA:
+ case a_s_ALEF_HAMZA_BELOW:
+ case a_s_YEH_HAMZA:
+ case a_s_ALEF:
+ case a_s_BEH:
+ case a_s_TEH_MARBUTA:
+ case a_s_TEH:
+ case a_s_THEH:
+ case a_s_JEEM:
+ case a_s_HAH:
+ case a_s_KHAH:
+ case a_s_DAL:
+ case a_s_THAL:
+ case a_s_REH:
+ case a_s_ZAIN:
+ case a_s_SEEN:
+ case a_s_SHEEN:
+ case a_s_SAD:
+ case a_s_DAD:
+ case a_s_TAH:
+ case a_s_ZAH:
+ case a_s_AIN:
+ case a_s_GHAIN:
+ case a_s_FEH:
+ case a_s_QAF:
+ case a_s_KAF:
+ case a_s_LAM:
+ case a_s_MEEM:
+ case a_s_NOON:
+ case a_s_HEH:
+ case a_s_WAW:
+ case a_s_ALEF_MAKSURA:
+ case a_s_YEH:
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+/*
+ * Returns True if c is a Final shape of an ARABIC letter
+ */
+ static int
+A_is_f(cur_c)
+ int cur_c;
+{
+ switch (cur_c)
+ {
+ case a_f_ALEF_MADDA:
+ case a_f_ALEF_HAMZA_ABOVE:
+ case a_f_WAW_HAMZA:
+ case a_f_ALEF_HAMZA_BELOW:
+ case a_f_YEH_HAMZA:
+ case a_f_ALEF:
+ case a_f_BEH:
+ case a_f_TEH_MARBUTA:
+ case a_f_TEH:
+ case a_f_THEH:
+ case a_f_JEEM:
+ case a_f_HAH:
+ case a_f_KHAH:
+ case a_f_DAL:
+ case a_f_THAL:
+ case a_f_REH:
+ case a_f_ZAIN:
+ case a_f_SEEN:
+ case a_f_SHEEN:
+ case a_f_SAD:
+ case a_f_DAD:
+ case a_f_TAH:
+ case a_f_ZAH:
+ case a_f_AIN:
+ case a_f_GHAIN:
+ case a_f_FEH:
+ case a_f_QAF:
+ case a_f_KAF:
+ case a_f_LAM:
+ case a_f_MEEM:
+ case a_f_NOON:
+ case a_f_HEH:
+ case a_f_WAW:
+ case a_f_ALEF_MAKSURA:
+ case a_f_YEH:
+ case a_f_LAM_ALEF_MADDA_ABOVE:
+ case a_f_LAM_ALEF_HAMZA_ABOVE:
+ case a_f_LAM_ALEF_HAMZA_BELOW:
+ case a_f_LAM_ALEF:
+ return TRUE;
+ }
+ return FALSE;
+}
+
+
+/*
+ * Change shape - from ISO-8859-6/Isolated to Form-B Isolated
+ */
+ static int
+chg_c_a2s(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ switch (cur_c)
+ {
+ case a_HAMZA:
+ tempc = a_s_HAMZA;
+ break;
+ case a_ALEF_MADDA:
+ tempc = a_s_ALEF_MADDA;
+ break;
+ case a_ALEF_HAMZA_ABOVE:
+ tempc = a_s_ALEF_HAMZA_ABOVE;
+ break;
+ case a_WAW_HAMZA:
+ tempc = a_s_WAW_HAMZA;
+ break;
+ case a_ALEF_HAMZA_BELOW:
+ tempc = a_s_ALEF_HAMZA_BELOW;
+ break;
+ case a_YEH_HAMZA:
+ tempc = a_s_YEH_HAMZA;
+ break;
+ case a_ALEF:
+ tempc = a_s_ALEF;
+ break;
+ case a_TEH_MARBUTA:
+ tempc = a_s_TEH_MARBUTA;
+ break;
+ case a_DAL:
+ tempc = a_s_DAL;
+ break;
+ case a_THAL:
+ tempc = a_s_THAL;
+ break;
+ case a_REH:
+ tempc = a_s_REH;
+ break;
+ case a_ZAIN:
+ tempc = a_s_ZAIN;
+ break;
+ case a_TATWEEL: /* exceptions */
+ tempc = cur_c;
+ break;
+ case a_WAW:
+ tempc = a_s_WAW;
+ break;
+ case a_ALEF_MAKSURA:
+ tempc = a_s_ALEF_MAKSURA;
+ break;
+ case a_BEH:
+ tempc = a_s_BEH;
+ break;
+ case a_TEH:
+ tempc = a_s_TEH;
+ break;
+ case a_THEH:
+ tempc = a_s_THEH;
+ break;
+ case a_JEEM:
+ tempc = a_s_JEEM;
+ break;
+ case a_HAH:
+ tempc = a_s_HAH;
+ break;
+ case a_KHAH:
+ tempc = a_s_KHAH;
+ break;
+ case a_SEEN:
+ tempc = a_s_SEEN;
+ break;
+ case a_SHEEN:
+ tempc = a_s_SHEEN;
+ break;
+ case a_SAD:
+ tempc = a_s_SAD;
+ break;
+ case a_DAD:
+ tempc = a_s_DAD;
+ break;
+ case a_TAH:
+ tempc = a_s_TAH;
+ break;
+ case a_ZAH:
+ tempc = a_s_ZAH;
+ break;
+ case a_AIN:
+ tempc = a_s_AIN;
+ break;
+ case a_GHAIN:
+ tempc = a_s_GHAIN;
+ break;
+ case a_FEH:
+ tempc = a_s_FEH;
+ break;
+ case a_QAF:
+ tempc = a_s_QAF;
+ break;
+ case a_KAF:
+ tempc = a_s_KAF;
+ break;
+ case a_LAM:
+ tempc = a_s_LAM;
+ break;
+ case a_MEEM:
+ tempc = a_s_MEEM;
+ break;
+ case a_NOON:
+ tempc = a_s_NOON;
+ break;
+ case a_HEH:
+ tempc = a_s_HEH;
+ break;
+ case a_YEH:
+ tempc = a_s_YEH;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from ISO-8859-6/Isolated to Initial
+ */
+ static int
+chg_c_a2i(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ switch (cur_c)
+ {
+ case a_YEH_HAMZA:
+ tempc = a_i_YEH_HAMZA;
+ break;
+ case a_HAMZA: /* exceptions */
+ tempc = a_s_HAMZA;
+ break;
+ case a_ALEF_MADDA: /* exceptions */
+ tempc = a_s_ALEF_MADDA;
+ break;
+ case a_ALEF_HAMZA_ABOVE: /* exceptions */
+ tempc = a_s_ALEF_HAMZA_ABOVE;
+ break;
+ case a_WAW_HAMZA: /* exceptions */
+ tempc = a_s_WAW_HAMZA;
+ break;
+ case a_ALEF_HAMZA_BELOW: /* exceptions */
+ tempc = a_s_ALEF_HAMZA_BELOW;
+ break;
+ case a_ALEF: /* exceptions */
+ tempc = a_s_ALEF;
+ break;
+ case a_TEH_MARBUTA: /* exceptions */
+ tempc = a_s_TEH_MARBUTA;
+ break;
+ case a_DAL: /* exceptions */
+ tempc = a_s_DAL;
+ break;
+ case a_THAL: /* exceptions */
+ tempc = a_s_THAL;
+ break;
+ case a_REH: /* exceptions */
+ tempc = a_s_REH;
+ break;
+ case a_ZAIN: /* exceptions */
+ tempc = a_s_ZAIN;
+ break;
+ case a_TATWEEL: /* exceptions */
+ tempc = cur_c;
+ break;
+ case a_WAW: /* exceptions */
+ tempc = a_s_WAW;
+ break;
+ case a_ALEF_MAKSURA: /* exceptions */
+ tempc = a_s_ALEF_MAKSURA;
+ break;
+ case a_BEH:
+ tempc = a_i_BEH;
+ break;
+ case a_TEH:
+ tempc = a_i_TEH;
+ break;
+ case a_THEH:
+ tempc = a_i_THEH;
+ break;
+ case a_JEEM:
+ tempc = a_i_JEEM;
+ break;
+ case a_HAH:
+ tempc = a_i_HAH;
+ break;
+ case a_KHAH:
+ tempc = a_i_KHAH;
+ break;
+ case a_SEEN:
+ tempc = a_i_SEEN;
+ break;
+ case a_SHEEN:
+ tempc = a_i_SHEEN;
+ break;
+ case a_SAD:
+ tempc = a_i_SAD;
+ break;
+ case a_DAD:
+ tempc = a_i_DAD;
+ break;
+ case a_TAH:
+ tempc = a_i_TAH;
+ break;
+ case a_ZAH:
+ tempc = a_i_ZAH;
+ break;
+ case a_AIN:
+ tempc = a_i_AIN;
+ break;
+ case a_GHAIN:
+ tempc = a_i_GHAIN;
+ break;
+ case a_FEH:
+ tempc = a_i_FEH;
+ break;
+ case a_QAF:
+ tempc = a_i_QAF;
+ break;
+ case a_KAF:
+ tempc = a_i_KAF;
+ break;
+ case a_LAM:
+ tempc = a_i_LAM;
+ break;
+ case a_MEEM:
+ tempc = a_i_MEEM;
+ break;
+ case a_NOON:
+ tempc = a_i_NOON;
+ break;
+ case a_HEH:
+ tempc = a_i_HEH;
+ break;
+ case a_YEH:
+ tempc = a_i_YEH;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from ISO-8859-6/Isolated to Medial
+ */
+ static int
+chg_c_a2m(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ switch (cur_c)
+ {
+ case a_HAMZA: /* exception */
+ tempc = a_s_HAMZA;
+ break;
+ case a_ALEF_MADDA: /* exception */
+ tempc = a_f_ALEF_MADDA;
+ break;
+ case a_ALEF_HAMZA_ABOVE: /* exception */
+ tempc = a_f_ALEF_HAMZA_ABOVE;
+ break;
+ case a_WAW_HAMZA: /* exception */
+ tempc = a_f_WAW_HAMZA;
+ break;
+ case a_ALEF_HAMZA_BELOW: /* exception */
+ tempc = a_f_ALEF_HAMZA_BELOW;
+ break;
+ case a_YEH_HAMZA:
+ tempc = a_m_YEH_HAMZA;
+ break;
+ case a_ALEF: /* exception */
+ tempc = a_f_ALEF;
+ break;
+ case a_BEH:
+ tempc = a_m_BEH;
+ break;
+ case a_TEH_MARBUTA: /* exception */
+ tempc = a_f_TEH_MARBUTA;
+ break;
+ case a_TEH:
+ tempc = a_m_TEH;
+ break;
+ case a_THEH:
+ tempc = a_m_THEH;
+ break;
+ case a_JEEM:
+ tempc = a_m_JEEM;
+ break;
+ case a_HAH:
+ tempc = a_m_HAH;
+ break;
+ case a_KHAH:
+ tempc = a_m_KHAH;
+ break;
+ case a_DAL: /* exception */
+ tempc = a_f_DAL;
+ break;
+ case a_THAL: /* exception */
+ tempc = a_f_THAL;
+ break;
+ case a_REH: /* exception */
+ tempc = a_f_REH;
+ break;
+ case a_ZAIN: /* exception */
+ tempc = a_f_ZAIN;
+ break;
+ case a_SEEN:
+ tempc = a_m_SEEN;
+ break;
+ case a_SHEEN:
+ tempc = a_m_SHEEN;
+ break;
+ case a_SAD:
+ tempc = a_m_SAD;
+ break;
+ case a_DAD:
+ tempc = a_m_DAD;
+ break;
+ case a_TAH:
+ tempc = a_m_TAH;
+ break;
+ case a_ZAH:
+ tempc = a_m_ZAH;
+ break;
+ case a_AIN:
+ tempc = a_m_AIN;
+ break;
+ case a_GHAIN:
+ tempc = a_m_GHAIN;
+ break;
+ case a_TATWEEL: /* exception */
+ tempc = cur_c;
+ break;
+ case a_FEH:
+ tempc = a_m_FEH;
+ break;
+ case a_QAF:
+ tempc = a_m_QAF;
+ break;
+ case a_KAF:
+ tempc = a_m_KAF;
+ break;
+ case a_LAM:
+ tempc = a_m_LAM;
+ break;
+ case a_MEEM:
+ tempc = a_m_MEEM;
+ break;
+ case a_NOON:
+ tempc = a_m_NOON;
+ break;
+ case a_HEH:
+ tempc = a_m_HEH;
+ break;
+ case a_WAW: /* exception */
+ tempc = a_f_WAW;
+ break;
+ case a_ALEF_MAKSURA: /* exception */
+ tempc = a_f_ALEF_MAKSURA;
+ break;
+ case a_YEH:
+ tempc = a_m_YEH;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from ISO-8859-6/Isolated to final
+ */
+ static int
+chg_c_a2f(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ /* NOTE: these encodings need to be accounted for
+
+ a_f_ALEF_MADDA;
+ a_f_ALEF_HAMZA_ABOVE;
+ a_f_ALEF_HAMZA_BELOW;
+ a_f_LAM_ALEF_MADDA_ABOVE;
+ a_f_LAM_ALEF_HAMZA_ABOVE;
+ a_f_LAM_ALEF_HAMZA_BELOW;
+ */
+
+ switch (cur_c)
+ {
+ case a_HAMZA: /* exception */
+ tempc = a_s_HAMZA;
+ break;
+ case a_ALEF_MADDA:
+ tempc = a_f_ALEF_MADDA;
+ break;
+ case a_ALEF_HAMZA_ABOVE:
+ tempc = a_f_ALEF_HAMZA_ABOVE;
+ break;
+ case a_WAW_HAMZA:
+ tempc = a_f_WAW_HAMZA;
+ break;
+ case a_ALEF_HAMZA_BELOW:
+ tempc = a_f_ALEF_HAMZA_BELOW;
+ break;
+ case a_YEH_HAMZA:
+ tempc = a_f_YEH_HAMZA;
+ break;
+ case a_ALEF:
+ tempc = a_f_ALEF;
+ break;
+ case a_BEH:
+ tempc = a_f_BEH;
+ break;
+ case a_TEH_MARBUTA:
+ tempc = a_f_TEH_MARBUTA;
+ break;
+ case a_TEH:
+ tempc = a_f_TEH;
+ break;
+ case a_THEH:
+ tempc = a_f_THEH;
+ break;
+ case a_JEEM:
+ tempc = a_f_JEEM;
+ break;
+ case a_HAH:
+ tempc = a_f_HAH;
+ break;
+ case a_KHAH:
+ tempc = a_f_KHAH;
+ break;
+ case a_DAL:
+ tempc = a_f_DAL;
+ break;
+ case a_THAL:
+ tempc = a_f_THAL;
+ break;
+ case a_REH:
+ tempc = a_f_REH;
+ break;
+ case a_ZAIN:
+ tempc = a_f_ZAIN;
+ break;
+ case a_SEEN:
+ tempc = a_f_SEEN;
+ break;
+ case a_SHEEN:
+ tempc = a_f_SHEEN;
+ break;
+ case a_SAD:
+ tempc = a_f_SAD;
+ break;
+ case a_DAD:
+ tempc = a_f_DAD;
+ break;
+ case a_TAH:
+ tempc = a_f_TAH;
+ break;
+ case a_ZAH:
+ tempc = a_f_ZAH;
+ break;
+ case a_AIN:
+ tempc = a_f_AIN;
+ break;
+ case a_GHAIN:
+ tempc = a_f_GHAIN;
+ break;
+ case a_TATWEEL: /* exception */
+ tempc = cur_c;
+ break;
+ case a_FEH:
+ tempc = a_f_FEH;
+ break;
+ case a_QAF:
+ tempc = a_f_QAF;
+ break;
+ case a_KAF:
+ tempc = a_f_KAF;
+ break;
+ case a_LAM:
+ tempc = a_f_LAM;
+ break;
+ case a_MEEM:
+ tempc = a_f_MEEM;
+ break;
+ case a_NOON:
+ tempc = a_f_NOON;
+ break;
+ case a_HEH:
+ tempc = a_f_HEH;
+ break;
+ case a_WAW:
+ tempc = a_f_WAW;
+ break;
+ case a_ALEF_MAKSURA:
+ tempc = a_f_ALEF_MAKSURA;
+ break;
+ case a_YEH:
+ tempc = a_f_YEH;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from Initial to Medial
+ */
+ static int
+chg_c_i2m(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ switch (cur_c)
+ {
+ case a_i_YEH_HAMZA:
+ tempc = a_m_YEH_HAMZA;
+ break;
+ case a_i_BEH:
+ tempc = a_m_BEH;
+ break;
+ case a_i_TEH:
+ tempc = a_m_TEH;
+ break;
+ case a_i_THEH:
+ tempc = a_m_THEH;
+ break;
+ case a_i_JEEM:
+ tempc = a_m_JEEM;
+ break;
+ case a_i_HAH:
+ tempc = a_m_HAH;
+ break;
+ case a_i_KHAH:
+ tempc = a_m_KHAH;
+ break;
+ case a_i_SEEN:
+ tempc = a_m_SEEN;
+ break;
+ case a_i_SHEEN:
+ tempc = a_m_SHEEN;
+ break;
+ case a_i_SAD:
+ tempc = a_m_SAD;
+ break;
+ case a_i_DAD:
+ tempc = a_m_DAD;
+ break;
+ case a_i_TAH:
+ tempc = a_m_TAH;
+ break;
+ case a_i_ZAH:
+ tempc = a_m_ZAH;
+ break;
+ case a_i_AIN:
+ tempc = a_m_AIN;
+ break;
+ case a_i_GHAIN:
+ tempc = a_m_GHAIN;
+ break;
+ case a_i_FEH:
+ tempc = a_m_FEH;
+ break;
+ case a_i_QAF:
+ tempc = a_m_QAF;
+ break;
+ case a_i_KAF:
+ tempc = a_m_KAF;
+ break;
+ case a_i_LAM:
+ tempc = a_m_LAM;
+ break;
+ case a_i_MEEM:
+ tempc = a_m_MEEM;
+ break;
+ case a_i_NOON:
+ tempc = a_m_NOON;
+ break;
+ case a_i_HEH:
+ tempc = a_m_HEH;
+ break;
+ case a_i_YEH:
+ tempc = a_m_YEH;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from Final to Medial
+ */
+ static int
+chg_c_f2m(cur_c)
+ int cur_c;
+{
+ int tempc;
+
+ switch (cur_c)
+ {
+ /* NOTE: these encodings are multi-positional, no ?
+ case a_f_ALEF_MADDA:
+ case a_f_ALEF_HAMZA_ABOVE:
+ case a_f_ALEF_HAMZA_BELOW:
+ */
+ case a_f_YEH_HAMZA:
+ tempc = a_m_YEH_HAMZA;
+ break;
+ case a_f_WAW_HAMZA: /* exceptions */
+ case a_f_ALEF:
+ case a_f_TEH_MARBUTA:
+ case a_f_DAL:
+ case a_f_THAL:
+ case a_f_REH:
+ case a_f_ZAIN:
+ case a_f_WAW:
+ case a_f_ALEF_MAKSURA:
+ tempc = cur_c;
+ break;
+ case a_f_BEH:
+ tempc = a_m_BEH;
+ break;
+ case a_f_TEH:
+ tempc = a_m_TEH;
+ break;
+ case a_f_THEH:
+ tempc = a_m_THEH;
+ break;
+ case a_f_JEEM:
+ tempc = a_m_JEEM;
+ break;
+ case a_f_HAH:
+ tempc = a_m_HAH;
+ break;
+ case a_f_KHAH:
+ tempc = a_m_KHAH;
+ break;
+ case a_f_SEEN:
+ tempc = a_m_SEEN;
+ break;
+ case a_f_SHEEN:
+ tempc = a_m_SHEEN;
+ break;
+ case a_f_SAD:
+ tempc = a_m_SAD;
+ break;
+ case a_f_DAD:
+ tempc = a_m_DAD;
+ break;
+ case a_f_TAH:
+ tempc = a_m_TAH;
+ break;
+ case a_f_ZAH:
+ tempc = a_m_ZAH;
+ break;
+ case a_f_AIN:
+ tempc = a_m_AIN;
+ break;
+ case a_f_GHAIN:
+ tempc = a_m_GHAIN;
+ break;
+ case a_f_FEH:
+ tempc = a_m_FEH;
+ break;
+ case a_f_QAF:
+ tempc = a_m_QAF;
+ break;
+ case a_f_KAF:
+ tempc = a_m_KAF;
+ break;
+ case a_f_LAM:
+ tempc = a_m_LAM;
+ break;
+ case a_f_MEEM:
+ tempc = a_m_MEEM;
+ break;
+ case a_f_NOON:
+ tempc = a_m_NOON;
+ break;
+ case a_f_HEH:
+ tempc = a_m_HEH;
+ break;
+ case a_f_YEH:
+ tempc = a_m_YEH;
+ break;
+ /* NOTE: these encodings are multi-positional, no ?
+ case a_f_LAM_ALEF_MADDA_ABOVE:
+ case a_f_LAM_ALEF_HAMZA_ABOVE:
+ case a_f_LAM_ALEF_HAMZA_BELOW:
+ case a_f_LAM_ALEF:
+ */
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from Combination (2 char) to an Isolated
+ */
+ static int
+chg_c_laa2i(hid_c)
+ int hid_c;
+{
+ int tempc;
+
+ switch (hid_c)
+ {
+ case a_ALEF_MADDA:
+ tempc = a_s_LAM_ALEF_MADDA_ABOVE;
+ break;
+ case a_ALEF_HAMZA_ABOVE:
+ tempc = a_s_LAM_ALEF_HAMZA_ABOVE;
+ break;
+ case a_ALEF_HAMZA_BELOW:
+ tempc = a_s_LAM_ALEF_HAMZA_BELOW;
+ break;
+ case a_ALEF:
+ tempc = a_s_LAM_ALEF;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+
+/*
+ * Change shape - from Combination-Isolated to Final
+ */
+ static int
+chg_c_laa2f(hid_c)
+ int hid_c;
+{
+ int tempc;
+
+ switch (hid_c)
+ {
+ case a_ALEF_MADDA:
+ tempc = a_f_LAM_ALEF_MADDA_ABOVE;
+ break;
+ case a_ALEF_HAMZA_ABOVE:
+ tempc = a_f_LAM_ALEF_HAMZA_ABOVE;
+ break;
+ case a_ALEF_HAMZA_BELOW:
+ tempc = a_f_LAM_ALEF_HAMZA_BELOW;
+ break;
+ case a_ALEF:
+ tempc = a_f_LAM_ALEF;
+ break;
+ default:
+ tempc = 0;
+ }
+
+ return tempc;
+}
+
+/*
+ * Do "half-shaping" on character "c". Return zero if no shaping.
+ */
+ static int
+half_shape(c)
+ int c;
+{
+ if (A_is_a(c))
+ return chg_c_a2i(c);
+ if (A_is_valid(c) && A_is_f(c))
+ return chg_c_f2m(c);
+ return 0;
+}
+
+/*
+ * Do Arabic shaping on character "c". Returns the shaped character.
+ * out: "ccp" points to the first byte of the character to be shaped.
+ * in/out: "c1p" points to the first composing char for "c".
+ * in: "prev_c" is the previous character (not shaped)
+ * in: "prev_c1" is the first composing char for the previous char
+ * (not shaped)
+ * in: "next_c" is the next character (not shaped).
+ */
+ int
+arabic_shape(c, ccp, c1p, prev_c, prev_c1, next_c)
+ int c;
+ int *ccp;
+ int *c1p;
+ int prev_c;
+ int prev_c1;
+ int next_c;
+{
+ int curr_c;
+ int shape_c;
+ int curr_laa;
+ int prev_laa;
+
+ /* Deal only with Arabic character, pass back all others */
+ if (!A_is_ok(c))
+ return c;
+
+ /* half-shape current and previous character */
+ shape_c = half_shape(prev_c);
+
+ /* Save away current character */
+ curr_c = c;
+
+ curr_laa = A_firstc_laa(c, *c1p);
+ prev_laa = A_firstc_laa(prev_c, prev_c1);
+
+ if (curr_laa)
+ {
+ if (A_is_valid(prev_c) && !A_is_f(shape_c)
+ && !A_is_s(shape_c) && !prev_laa)
+ curr_c = chg_c_laa2f(curr_laa);
+ else
+ curr_c = chg_c_laa2i(curr_laa);
+
+ /* Remove the composing character */
+ *c1p = 0;
+ }
+ else if (!A_is_valid(prev_c) && A_is_valid(next_c))
+ curr_c = chg_c_a2i(c);
+ else if (!shape_c || A_is_f(shape_c) || A_is_s(shape_c) || prev_laa)
+ curr_c = A_is_valid(next_c) ? chg_c_a2i(c) : chg_c_a2s(c);
+ else if (A_is_valid(next_c))
+ curr_c = A_is_iso(c) ? chg_c_a2m(c) : chg_c_i2m(c);
+ else if (A_is_valid(prev_c))
+ curr_c = chg_c_a2f(c);
+ else
+ curr_c = chg_c_a2s(c);
+
+ /* Sanity check -- curr_c should, in the future, never be 0.
+ * We should, in the future, insert a fatal error here. */
+ if (curr_c == NUL)
+ curr_c = c;
+
+ if (curr_c != c && ccp != NULL)
+ {
+ char_u buf[MB_MAXBYTES];
+
+ /* Update the first byte of the character. */
+ (*mb_char2bytes)(curr_c, buf);
+ *ccp = buf[0];
+ }
+
+ /* Return the shaped character */
+ return curr_c;
+}
+
+
+/*
+ * A_firstc_laa returns first character of LAA combination if it exists
+ */
+ static int
+A_firstc_laa(c, c1)
+ int c; /* base character */
+ int c1; /* first composing character */
+{
+ if (c1 != NUL && c == a_LAM && !A_is_harakat(c1))
+ return c1;
+ return 0;
+}
+
+
+/*
+ * A_is_harakat returns TRUE if 'c' is an Arabic Harakat character
+ * (harakat/tanween)
+ */
+ static int
+A_is_harakat(c)
+ int c;
+{
+ return (c >= a_FATHATAN && c <= a_SUKUN);
+}
+
+
+/*
+ * A_is_iso returns TRUE if 'c' is an Arabic ISO-8859-6 character
+ * (alphabet/number/punctuation)
+ */
+ static int
+A_is_iso(c)
+ int c;
+{
+ return ((c >= a_HAMZA && c <= a_GHAIN)
+ || (c >= a_TATWEEL && c <= a_HAMZA_BELOW)
+ || c == a_MINI_ALEF);
+}
+
+
+/*
+ * A_is_formb returns TRUE if 'c' is an Arabic 10646-1 FormB character
+ * (alphabet/number/punctuation)
+ */
+ static int
+A_is_formb(c)
+ int c;
+{
+ return ((c >= a_s_FATHATAN && c <= a_s_DAMMATAN)
+ || c == a_s_KASRATAN
+ || (c >= a_s_FATHA && c <= a_f_LAM_ALEF)
+ || c == a_BYTE_ORDER_MARK);
+}
+
+
+/*
+ * A_is_ok returns TRUE if 'c' is an Arabic 10646 (8859-6 or Form-B)
+ */
+ static int
+A_is_ok(c)
+ int c;
+{
+ return (A_is_iso(c) || A_is_formb(c));
+}
+
+
+/*
+ * A_is_valid returns TRUE if 'c' is an Arabic 10646 (8859-6 or Form-B)
+ * with some exceptions/exclusions
+ */
+ static int
+A_is_valid(c)
+ int c;
+{
+ return (A_is_ok(c) && !A_is_special(c));
+}
+
+
+/*
+ * A_is_special returns TRUE if 'c' is not a special Arabic character.
+ * Specials don't adhere to most of the rules.
+ */
+ static int
+A_is_special(c)
+ int c;
+{
+ return (c == a_HAMZA || c == a_s_HAMZA);
+}
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