svn merge ^/branches/released .

1 files changed, 1203 insertions, 0 deletions

diff --git a/fontconfig/src/fcformat.c b/fontconfig/src/fcformat.c
new file mode 100644
index 000000000..bf9401740
--- /dev/null
+++ b/fontconfig/src/fcformat.c
@@ -0,0 +1,1203 @@
+/*
+ * Copyright © 2008,2009 Red Hat, Inc.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "fcint.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+
+/* The language is documented in doc/fcformat.fncs
+ * These are the features implemented:
+ *
+ * simple	%{elt}
+ * width	%width{elt}
+ * index	%{elt[idx]}
+ * name=	%{elt=}
+ * :name=	%{:elt}
+ * default	%{elt:-word}
+ * count	%{#elt}
+ * subexpr	%{{expr}}
+ * filter-out	%{-elt1,elt2,elt3{expr}}
+ * filter-in	%{+elt1,elt2,elt3{expr}}
+ * conditional	%{?elt1,elt2,!elt3{}{}}
+ * enumerate	%{[]elt1,elt2{expr}}
+ * langset	langset enumeration using the same syntax
+ * builtin	%{=blt}
+ * convert	%{elt|conv1|conv2|conv3}
+ *
+ * converters:
+ * basename	FcStrBasename
+ * dirname	FcStrDirname
+ * downcase	FcStrDowncase
+ * shescape
+ * cescape
+ * xmlescape
+ * delete	delete chars
+ * escape	escape chars
+ * translate	translate chars
+ *
+ * builtins:
+ * unparse	FcNameUnparse
+ * fcmatch	fc-match default
+ * fclist	fc-list default
+ * pkgkit	PackageKit package tag format
+ *
+ *
+ * Some ideas for future syntax extensions:
+ *
+ * - verbose builtin that is like FcPatternPrint
+ * - allow indexing subexprs using '%{[idx]elt1,elt2{subexpr}}'
+ * - conditional/filtering/deletion on binding (using '(w)'/'(s)'/'(=)' notation)
+ */
+
+
+#define FCMATCH_FORMAT	"%{file:-<unknown filename>|basename}: \"%{family[0]:-<unknown family>}\" \"%{style[0]:-<unknown style>}\""
+#define FCLIST_FORMAT	"%{?file{%{file}: }}%{=unparse}"
+#define PKGKIT_FORMAT	"%{[]family{font(%{family|downcase|delete( )})\n}}%{[]lang{font(:lang=%{lang|downcase|translate(_,-)})\n}}"
+
+
+static void
+message (const char *fmt, ...)
+{
+    va_list	args;
+    va_start (args, fmt);
+    fprintf (stderr, "Fontconfig: Pattern format error: ");
+    vfprintf (stderr, fmt, args);
+    fprintf (stderr, ".\n");
+    va_end (args);
+}
+
+
+typedef struct _FcFormatContext
+{
+    const FcChar8 *format_orig;
+    const FcChar8 *format;
+    int            format_len;
+    FcChar8       *word;
+    FcBool         word_allocated;
+} FcFormatContext;
+
+static FcBool
+FcFormatContextInit (FcFormatContext *c,
+		     const FcChar8   *format,
+		     FcChar8         *scratch,
+		     int              scratch_len)
+{
+    c->format_orig = c->format = format;
+    c->format_len = strlen ((const char *) format);
+
+    if (c->format_len < scratch_len)
+    {
+	c->word = scratch;
+	c->word_allocated = FcFalse;
+    }
+    else
+    {
+	c->word = malloc (c->format_len + 1);
+	c->word_allocated = FcTrue;
+    }
+
+    return c->word != NULL;
+}
+
+static void
+FcFormatContextDone (FcFormatContext *c)
+{
+    if (c && c->word_allocated)
+    {
+	free (c->word);
+    }
+}
+
+static FcBool
+consume_char (FcFormatContext *c,
+	      FcChar8          term)
+{
+    if (*c->format != term)
+	return FcFalse;
+
+    c->format++;
+    return FcTrue;
+}
+
+static FcBool
+expect_char (FcFormatContext *c,
+	      FcChar8          term)
+{
+    FcBool res = consume_char (c, term);
+    if (!res)
+    {
+	if (c->format == c->format_orig + c->format_len)
+	    message ("format ended while expecting '%c'",
+		     term);
+	else
+	    message ("expected '%c' at %d",
+		     term, c->format - c->format_orig + 1);
+    }
+    return res;
+}
+
+static FcBool
+FcCharIsPunct (const FcChar8 c)
+{
+    if (c < '0')
+	return FcTrue;
+    if (c <= '9')
+	return FcFalse;
+    if (c < 'A')
+	return FcTrue;
+    if (c <= 'Z')
+	return FcFalse;
+    if (c < 'a')
+	return FcTrue;
+    if (c <= 'z')
+	return FcFalse;
+    if (c <= '~')
+	return FcTrue;
+    return FcFalse;
+}
+
+static char escaped_char(const char ch)
+{
+    switch (ch) {
+    case 'a':   return '\a';
+    case 'b':   return '\b';
+    case 'f':   return '\f';
+    case 'n':   return '\n';
+    case 'r':   return '\r';
+    case 't':   return '\t';
+    case 'v':   return '\v';
+    default:    return ch;
+    }
+}
+
+static FcBool
+read_word (FcFormatContext *c)
+{
+    FcChar8 *p;
+
+    p = c->word;
+
+    while (*c->format)
+    {
+	if (*c->format == '\\')
+	{
+	    c->format++;
+	    if (*c->format)
+	      *p++ = escaped_char (*c->format++);
+	    continue;
+	}
+	else if (FcCharIsPunct (*c->format))
+	    break;
+
+	*p++ = *c->format++;
+    }
+    *p = '\0';
+
+    if (p == c->word)
+    {
+	message ("expected identifier at %d",
+		 c->format - c->format_orig + 1);
+	return FcFalse;
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+read_chars (FcFormatContext *c,
+	    FcChar8          term)
+{
+    FcChar8 *p;
+
+    p = c->word;
+
+    while (*c->format && *c->format != '}' && *c->format != term)
+    {
+	if (*c->format == '\\')
+	{
+	    c->format++;
+	    if (*c->format)
+	      *p++ = escaped_char (*c->format++);
+	    continue;
+	}
+
+	*p++ = *c->format++;
+    }
+    *p = '\0';
+
+    if (p == c->word)
+    {
+	message ("expected character data at %d",
+		 c->format - c->format_orig + 1);
+	return FcFalse;
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+FcPatternFormatToBuf (FcPattern     *pat,
+		      const FcChar8 *format,
+		      FcStrBuf      *buf);
+
+static FcBool
+interpret_builtin (FcFormatContext *c,
+		   FcPattern       *pat,
+		   FcStrBuf        *buf)
+{
+    FcChar8       *new_str;
+    FcBool         ret;
+
+    if (!expect_char (c, '=') ||
+	!read_word (c))
+	return FcFalse;
+
+    /* try simple builtins first */
+    if (0) { }
+#define BUILTIN(name, func) \
+    else if (0 == strcmp ((const char *) c->word, name))\
+	do { new_str = func (pat); ret = FcTrue; } while (0)
+    BUILTIN ("unparse",  FcNameUnparse);
+ /* BUILTIN ("verbose",  FcPatternPrint); XXX */
+#undef BUILTIN
+    else
+	ret = FcFalse;
+
+    if (ret)
+    {
+	if (new_str)
+	{
+	    FcStrBufString (buf, new_str);
+	    free (new_str);
+	    return FcTrue;
+	}
+	else
+	    return FcFalse;
+    }
+
+    /* now try our custom formats */
+    if (0) { }
+#define BUILTIN(name, format) \
+    else if (0 == strcmp ((const char *) c->word, name))\
+	ret = FcPatternFormatToBuf (pat, (const FcChar8 *) format, buf)
+    BUILTIN ("fcmatch",  FCMATCH_FORMAT);
+    BUILTIN ("fclist",   FCLIST_FORMAT);
+    BUILTIN ("pkgkit",   PKGKIT_FORMAT);
+#undef BUILTIN
+    else
+	ret = FcFalse;
+
+    if (!ret)
+	message ("unknown builtin \"%s\"",
+		 c->word);
+
+    return ret;
+}
+
+static FcBool
+interpret_expr (FcFormatContext *c,
+		FcPattern       *pat,
+		FcStrBuf        *buf,
+		FcChar8          term);
+
+static FcBool
+interpret_subexpr (FcFormatContext *c,
+		   FcPattern       *pat,
+		   FcStrBuf        *buf)
+{
+    return expect_char (c, '{') &&
+	   interpret_expr (c, pat, buf, '}') &&
+	   expect_char (c, '}');
+}
+
+static FcBool
+maybe_interpret_subexpr (FcFormatContext *c,
+			 FcPattern       *pat,
+			 FcStrBuf        *buf)
+{
+    return (*c->format == '{') ?
+	   interpret_subexpr (c, pat, buf) :
+	   FcTrue;
+}
+
+static FcBool
+skip_subexpr (FcFormatContext *c);
+
+static FcBool
+skip_percent (FcFormatContext *c)
+{
+    int width;
+
+    if (!expect_char (c, '%'))
+	return FcFalse;
+
+    /* skip an optional width specifier */
+    width = strtol ((const char *) c->format, (char **) &c->format, 10);
+
+    if (!expect_char (c, '{'))
+	return FcFalse;
+
+    while(*c->format && *c->format != '}')
+    {
+	switch (*c->format)
+	{
+	case '\\':
+	    c->format++; /* skip over '\\' */
+	    if (*c->format)
+		c->format++;
+	    continue;
+	case '{':
+	    if (!skip_subexpr (c))
+		return FcFalse;
+	    continue;
+	}
+	c->format++;
+    }
+
+    return expect_char (c, '}');
+}
+
+static FcBool
+skip_expr (FcFormatContext *c)
+{
+    while(*c->format && *c->format != '}')
+    {
+	switch (*c->format)
+	{
+	case '\\':
+	    c->format++; /* skip over '\\' */
+	    if (*c->format)
+		c->format++;
+	    continue;
+	case '%':
+	    if (!skip_percent (c))
+		return FcFalse;
+	    continue;
+	}
+	c->format++;
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+skip_subexpr (FcFormatContext *c)
+{
+    return expect_char (c, '{') &&
+	   skip_expr (c) &&
+	   expect_char (c, '}');
+}
+
+static FcBool
+maybe_skip_subexpr (FcFormatContext *c)
+{
+    return (*c->format == '{') ?
+	   skip_subexpr (c) :
+	   FcTrue;
+}
+
+static FcBool
+interpret_filter_in (FcFormatContext *c,
+		     FcPattern       *pat,
+		     FcStrBuf        *buf)
+{
+    FcObjectSet  *os;
+    FcPattern    *subpat;
+
+    if (!expect_char (c, '+'))
+	return FcFalse;
+
+    os = FcObjectSetCreate ();
+    if (!os)
+	return FcFalse;
+
+    do
+    {
+	if (!read_word (c) ||
+	    !FcObjectSetAdd (os, (const char *) c->word))
+	{
+	    FcObjectSetDestroy (os);
+	    return FcFalse;
+	}
+    }
+    while (consume_char (c, ','));
+
+    subpat = FcPatternFilter (pat, os);
+    FcObjectSetDestroy (os);
+
+    if (!subpat ||
+	!interpret_subexpr (c, subpat, buf))
+	return FcFalse;
+
+    FcPatternDestroy (subpat);
+    return FcTrue;
+}
+
+static FcBool
+interpret_filter_out (FcFormatContext *c,
+		      FcPattern       *pat,
+		      FcStrBuf        *buf)
+{
+    FcPattern    *subpat;
+
+    if (!expect_char (c, '-'))
+	return FcFalse;
+
+    subpat = FcPatternDuplicate (pat);
+    if (!subpat)
+	return FcFalse;
+
+    do
+    {
+	if (!read_word (c))
+	{
+	    FcPatternDestroy (subpat);
+	    return FcFalse;
+	}
+
+	FcPatternDel (subpat, (const char *) c->word);
+    }
+    while (consume_char (c, ','));
+
+    if (!interpret_subexpr (c, subpat, buf))
+	return FcFalse;
+
+    FcPatternDestroy (subpat);
+    return FcTrue;
+}
+
+static FcBool
+interpret_cond (FcFormatContext *c,
+		FcPattern       *pat,
+		FcStrBuf        *buf)
+{
+    FcBool pass;
+
+    if (!expect_char (c, '?'))
+	return FcFalse;
+
+    pass = FcTrue;
+
+    do
+    {
+	FcBool negate;
+	FcValue v;
+
+	negate = consume_char (c, '!');
+
+	if (!read_word (c))
+	    return FcFalse;
+
+	pass = pass &&
+	       (negate ^
+		(FcResultMatch ==
+		 FcPatternGet (pat, (const char *) c->word, 0, &v)));
+    }
+    while (consume_char (c, ','));
+
+    if (pass)
+    {
+	if (!interpret_subexpr  (c, pat, buf) ||
+	    !maybe_skip_subexpr (c))
+	    return FcFalse;
+    }
+    else
+    {
+	if (!skip_subexpr (c) ||
+	    !maybe_interpret_subexpr  (c, pat, buf))
+	    return FcFalse;
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+interpret_count (FcFormatContext *c,
+		 FcPattern       *pat,
+		 FcStrBuf        *buf)
+{
+    int count;
+    FcPatternElt *e;
+    FcChar8 buf_static[64];
+
+    if (!expect_char (c, '#'))
+	return FcFalse;
+
+    if (!read_word (c))
+	return FcFalse;
+
+    count = 0;
+    e = FcPatternObjectFindElt (pat,
+				FcObjectFromName ((const char *) c->word));
+    if (e)
+    {
+	FcValueListPtr l;
+	count++;
+	for (l = FcPatternEltValues(e);
+	     l->next;
+	     l = l->next)
+	    count++;
+    }
+
+    snprintf ((char *) buf_static, sizeof (buf_static), "%d", count);
+    FcStrBufString (buf, buf_static);
+
+    return FcTrue;
+}
+
+static FcBool
+interpret_enumerate (FcFormatContext *c,
+		     FcPattern       *pat,
+		     FcStrBuf        *buf)
+{
+    FcObjectSet   *os;
+    FcPattern     *subpat;
+    const FcChar8 *format_save;
+    int            idx;
+    FcBool         ret, done;
+    FcStrList      *lang_strs;
+
+    if (!expect_char (c, '[') ||
+	!expect_char (c, ']'))
+	return FcFalse;
+
+    os = FcObjectSetCreate ();
+    if (!os)
+	return FcFalse;
+
+    ret = FcTrue;
+
+    do
+    {
+	if (!read_word (c) ||
+	    !FcObjectSetAdd (os, (const char *) c->word))
+	{
+	    FcObjectSetDestroy (os);
+	    return FcFalse;
+	}
+    }
+    while (consume_char (c, ','));
+
+    /* If we have one element and it's of type FcLangSet, we want
+     * to enumerate the languages in it. */
+    lang_strs = NULL;
+    if (os->nobject == 1)
+    {
+	FcLangSet *langset;
+	if (FcResultMatch ==
+	    FcPatternGetLangSet (pat, os->objects[0], idx, &langset))
+	{
+	    FcStrSet *ss;
+	    if (!(ss = FcLangSetGetLangs (langset)) ||
+		!(lang_strs = FcStrListCreate (ss)))
+		goto bail0;
+	}
+    }
+
+    subpat = FcPatternDuplicate (pat);
+    if (!subpat)
+	goto bail0;
+
+    format_save = c->format;
+    idx = 0;
+    do
+    {
+	int i;
+
+	done = FcTrue;
+
+	if (lang_strs)
+	{
+	    FcChar8 *lang;
+
+	    FcPatternDel (subpat, os->objects[0]);
+	    if ((lang = FcStrListNext (lang_strs)))
+	    {
+		FcPatternAddString (subpat, os->objects[0], lang);
+		done = FcFalse;
+	    }
+	}
+	else
+	{
+	    for (i = 0; i < os->nobject; i++)
+	    {
+		FcValue v;
+
+		/* XXX this can be optimized by accessing valuelist linked lists
+		 * directly and remembering where we were.  Most (all) value lists
+		 * in normal uses are pretty short though (language tags are
+		 * stored as a LangSet, not separate values.). */
+		FcPatternDel (subpat, os->objects[i]);
+		if (FcResultMatch ==
+		    FcPatternGet (pat, os->objects[i], idx, &v))
+		{
+		    FcPatternAdd (subpat, os->objects[i], v, FcFalse);
+		    done = FcFalse;
+		}
+	    }
+	}
+
+	if (!done)
+	{
+	    c->format = format_save;
+	    ret = interpret_subexpr (c, subpat, buf);
+	    if (!ret)
+		goto bail;
+	}
+
+	idx++;
+    } while (!done);
+
+    if (c->format == format_save)
+	skip_subexpr (c);
+
+bail:
+    FcPatternDestroy (subpat);
+bail0:
+    if (lang_strs)
+	FcStrListDone (lang_strs);
+    FcObjectSetDestroy (os);
+
+    return ret;
+}
+
+static FcBool
+interpret_simple (FcFormatContext *c,
+		  FcPattern       *pat,
+		  FcStrBuf        *buf)
+{
+    FcPatternElt *e;
+    FcBool        add_colon = FcFalse;
+    FcBool        add_elt_name = FcFalse;
+    int           idx;
+    FcChar8      *else_string;
+
+    if (consume_char (c, ':'))
+	add_colon = FcTrue;
+
+    if (!read_word (c))
+	return FcFalse;
+
+    idx = -1;
+    if (consume_char (c, '['))
+    {
+	idx = strtol ((const char *) c->format, (char **) &c->format, 10);
+	if (idx < 0)
+	{
+	    message ("expected non-negative number at %d",
+		     c->format-1 - c->format_orig + 1);
+	    return FcFalse;
+	}
+	if (!expect_char (c, ']'))
+	    return FcFalse;
+    }
+
+    if (consume_char (c, '='))
+	add_elt_name = FcTrue;
+
+    /* modifiers */
+    else_string = NULL;
+    if (consume_char (c, ':'))
+    {
+	FcChar8 *orig;
+	/* divert the c->word for now */
+	orig = c->word;
+	c->word = c->word + strlen ((const char *) c->word) + 1;
+	/* for now we just support 'default value' */
+	if (!expect_char (c, '-') ||
+	    !read_chars (c, '\0'))
+	{
+	    c->word = orig;
+	    return FcFalse;
+	}
+	else_string = c->word;
+	c->word = orig;
+    }
+
+    e = FcPatternObjectFindElt (pat,
+				FcObjectFromName ((const char *) c->word));
+    if (e || else_string)
+    {
+	FcValueListPtr l = NULL;
+
+	if (add_colon)
+	    FcStrBufChar (buf, ':');
+	if (add_elt_name)
+	{
+	    FcStrBufString (buf, c->word);
+	    FcStrBufChar (buf, '=');
+	}
+
+	if (e)
+	    l = FcPatternEltValues(e);
+
+	if (idx != -1)
+	{
+	    while (l && idx > 0)
+	    {
+		l = FcValueListNext(l);
+		idx--;
+	    }
+	    if (l && idx == 0)
+	    {
+		if (!FcNameUnparseValue (buf, &l->value, '\0'))
+		    return FcFalse;
+	    }
+	    else goto notfound;
+        }
+	else if (l)
+	{
+	    FcNameUnparseValueList (buf, l, '\0');
+	}
+	else
+	{
+    notfound:
+	    if (else_string)
+		FcStrBufString (buf, else_string);
+	}
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+cescape (FcFormatContext *c,
+	 const FcChar8   *str,
+	 FcStrBuf        *buf)
+{
+    while(*str)
+    {
+	switch (*str)
+	{
+	case '\\':
+	case '"':
+	    FcStrBufChar (buf, '\\');
+	    break;
+	}
+	FcStrBufChar (buf, *str++);
+    }
+    return FcTrue;
+}
+
+static FcBool
+shescape (FcFormatContext *c,
+	  const FcChar8   *str,
+	  FcStrBuf        *buf)
+{
+    FcStrBufChar (buf, '\'');
+    while(*str)
+    {
+	if (*str == '\'')
+	    FcStrBufString (buf, (const FcChar8 *) "'\\''");
+	else
+	    FcStrBufChar (buf, *str);
+	str++;
+    }
+    FcStrBufChar (buf, '\'');
+    return FcTrue;
+}
+
+static FcBool
+xmlescape (FcFormatContext *c,
+	   const FcChar8   *str,
+	   FcStrBuf        *buf)
+{
+    while(*str)
+    {
+	switch (*str)
+	{
+	case '&': FcStrBufString (buf, (const FcChar8 *) "&amp;"); break;
+	case '<': FcStrBufString (buf, (const FcChar8 *) "&lt;");  break;
+	case '>': FcStrBufString (buf, (const FcChar8 *) "&gt;");  break;
+	default:  FcStrBufChar   (buf, *str);                      break;
+	}
+	str++;
+    }
+    return FcTrue;
+}
+
+static FcBool
+delete_chars (FcFormatContext *c,
+	      const FcChar8   *str,
+	      FcStrBuf        *buf)
+{
+    /* XXX not UTF-8 aware */
+
+    if (!expect_char (c, '(') ||
+	!read_chars (c, ')') ||
+	!expect_char (c, ')'))
+	return FcFalse;
+
+    while(*str)
+    {
+	FcChar8 *p;
+
+	p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word);
+	if (p)
+	{
+	    FcStrBufData (buf, str, p - str);
+	    str = p + 1;
+	}
+	else
+	{
+	    FcStrBufString (buf, str);
+	    break;
+	}
+
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+escape_chars (FcFormatContext *c,
+	      const FcChar8   *str,
+	      FcStrBuf        *buf)
+{
+    /* XXX not UTF-8 aware */
+
+    if (!expect_char (c, '(') ||
+	!read_chars (c, ')') ||
+	!expect_char (c, ')'))
+	return FcFalse;
+
+    while(*str)
+    {
+	FcChar8 *p;
+
+	p = (FcChar8 *) strpbrk ((const char *) str, (const char *) c->word);
+	if (p)
+	{
+	    FcStrBufData (buf, str, p - str);
+	    FcStrBufChar (buf, c->word[0]);
+	    FcStrBufChar (buf, *p);
+	    str = p + 1;
+	}
+	else
+	{
+	    FcStrBufString (buf, str);
+	    break;
+	}
+
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+translate_chars (FcFormatContext *c,
+		 const FcChar8   *str,
+		 FcStrBuf        *buf)
+{
+    char *from, *to, repeat;
+    int from_len, to_len;
+
+    /* XXX not UTF-8 aware */
+
+    if (!expect_char (c, '(') ||
+	!read_chars (c, ',') ||
+	!expect_char (c, ','))
+	return FcFalse;
+
+    from = (char *) c->word;
+    from_len = strlen (from);
+    to = from + from_len + 1;
+
+    /* hack: we temporarily divert c->word */
+    c->word = (FcChar8 *) to;
+    if (!read_chars (c, ')'))
+    {
+      c->word = (FcChar8 *) from;
+      return FcFalse;
+    }
+    c->word = (FcChar8 *) from;
+
+    to_len = strlen (to);
+    repeat = to[to_len - 1];
+
+    if (!expect_char (c, ')'))
+	return FcFalse;
+
+    while(*str)
+    {
+	FcChar8 *p;
+
+	p = (FcChar8 *) strpbrk ((const char *) str, (const char *) from);
+	if (p)
+	{
+	    int i;
+	    FcStrBufData (buf, str, p - str);
+	    i = strchr (from, *p) - from;
+	    FcStrBufChar (buf, i < to_len ? to[i] : repeat);
+	    str = p + 1;
+	}
+	else
+	{
+	    FcStrBufString (buf, str);
+	    break;
+	}
+
+    }
+
+    return FcTrue;
+}
+
+static FcBool
+interpret_convert (FcFormatContext *c,
+		   FcStrBuf        *buf,
+		   int              start)
+{
+    const FcChar8 *str;
+    FcChar8       *new_str;
+    FcStrBuf       new_buf;
+    FcChar8        buf_static[8192];
+    FcBool         ret;
+
+    if (!expect_char (c, '|') ||
+	!read_word (c))
+	return FcFalse;
+
+    /* prepare the buffer */
+    FcStrBufChar (buf, '\0');
+    if (buf->failed)
+	return FcFalse;
+    str = buf->buf + start;
+    buf->len = start;
+
+    /* try simple converters first */
+    if (0) { }
+#define CONVERTER(name, func) \
+    else if (0 == strcmp ((const char *) c->word, name))\
+	do { new_str = func (str); ret = FcTrue; } while (0)
+    CONVERTER  ("downcase",  FcStrDowncase);
+    CONVERTER  ("basename",  FcStrBasename);
+    CONVERTER  ("dirname",   FcStrDirname);
+#undef CONVERTER
+    else
+	ret = FcFalse;
+
+    if (ret)
+    {
+	if (new_str)
+	{
+	    FcStrBufString (buf, new_str);
+	    free (new_str);
+	    return FcTrue;
+	}
+	else
+	    return FcFalse;
+    }
+
+    FcStrBufInit (&new_buf, buf_static, sizeof (buf_static));
+
+    /* now try our custom converters */
+    if (0) { }
+#define CONVERTER(name, func) \
+    else if (0 == strcmp ((const char *) c->word, name))\
+	ret = func (c, str, &new_buf)
+    CONVERTER ("cescape",   cescape);
+    CONVERTER ("shescape",  shescape);
+    CONVERTER ("xmlescape", xmlescape);
+    CONVERTER ("delete",    delete_chars);
+    CONVERTER ("escape",    escape_chars);
+    CONVERTER ("translate", translate_chars);
+#undef CONVERTER
+    else
+	ret = FcFalse;
+
+    if (ret)
+    {
+	FcStrBufChar (&new_buf, '\0');
+	FcStrBufString (buf, new_buf.buf);
+    }
+    else
+	message ("unknown converter \"%s\"",
+		 c->word);
+
+    FcStrBufDestroy (&new_buf);
+
+    return ret;
+}
+
+static FcBool
+maybe_interpret_converts (FcFormatContext *c,
+			   FcStrBuf        *buf,
+			   int              start)
+{
+    while (*c->format == '|')
+	if (!interpret_convert (c, buf, start))
+	    return FcFalse;
+
+    return FcTrue;
+}
+
+static FcBool
+align_to_width (FcStrBuf *buf,
+		int       start,
+		int       width)
+{
+    int len;
+
+    if (buf->failed)
+	return FcFalse;
+
+    len = buf->len - start;
+    if (len < -width)
+    {
+	/* left align */
+	while (len++ < -width)
+	    FcStrBufChar (buf, ' ');
+    }
+    else if (len < width)
+    {
+	int old_len;
+	old_len = len;
+	/* right align */
+	while (len++ < width)
+	    FcStrBufChar (buf, ' ');
+	if (buf->failed)
+	    return FcFalse;
+	len = old_len;
+	memmove (buf->buf + buf->len - len,
+		 buf->buf + buf->len - width,
+		 len);
+	memset (buf->buf + buf->len - width,
+		' ',
+		width - len);
+    }
+
+    return !buf->failed;
+}
+static FcBool
+interpret_percent (FcFormatContext *c,
+		   FcPattern       *pat,
+		   FcStrBuf        *buf)
+{
+    int width, start;
+    FcBool ret;
+
+    if (!expect_char (c, '%'))
+	return FcFalse;
+
+    if (consume_char (c, '%')) /* "%%" */
+    {
+	FcStrBufChar (buf, '%');
+	return FcTrue;
+    }
+
+    /* parse an optional width specifier */
+    width = strtol ((const char *) c->format, (char **) &c->format, 10);
+
+    if (!expect_char (c, '{'))
+	return FcFalse;
+
+    start = buf->len;
+
+    switch (*c->format) {
+    case '=': ret = interpret_builtin    (c, pat, buf); break;
+    case '{': ret = interpret_subexpr    (c, pat, buf); break;
+    case '+': ret = interpret_filter_in  (c, pat, buf); break;
+    case '-': ret = interpret_filter_out (c, pat, buf); break;
+    case '?': ret = interpret_cond       (c, pat, buf); break;
+    case '#': ret = interpret_count      (c, pat, buf); break;
+    case '[': ret = interpret_enumerate  (c, pat, buf); break;
+    default:  ret = interpret_simple     (c, pat, buf); break;
+    }
+
+    return ret &&
+	   maybe_interpret_converts (c, buf, start) &&
+	   align_to_width (buf, start, width) &&
+	   expect_char (c, '}');
+}
+
+static FcBool
+interpret_expr (FcFormatContext *c,
+		FcPattern       *pat,
+		FcStrBuf        *buf,
+		FcChar8          term)
+{
+    while (*c->format && *c->format != term)
+    {
+	switch (*c->format)
+	{
+	case '\\':
+	    c->format++; /* skip over '\\' */
+	    if (*c->format)
+		FcStrBufChar (buf, escaped_char (*c->format++));
+	    continue;
+	case '%':
+	    if (!interpret_percent (c, pat, buf))
+		return FcFalse;
+	    continue;
+	}
+	FcStrBufChar (buf, *c->format++);
+    }
+    return FcTrue;
+}
+
+static FcBool
+FcPatternFormatToBuf (FcPattern     *pat,
+		      const FcChar8 *format,
+		      FcStrBuf      *buf)
+{
+    FcFormatContext c;
+    FcChar8         word_static[1024];
+    FcBool          ret;
+
+    if (!FcFormatContextInit (&c, format, word_static, sizeof (word_static)))
+	return FcFalse;
+
+    ret = interpret_expr (&c, pat, buf, '\0');
+
+    FcFormatContextDone (&c);
+
+    return ret;
+}
+
+FcChar8 *
+FcPatternFormat (FcPattern *pat,
+		 const FcChar8 *format)
+{
+    FcStrBuf        buf;
+    FcChar8         buf_static[8192 - 1024];
+    FcBool          ret;
+
+    FcStrBufInit (&buf, buf_static, sizeof (buf_static));
+
+    ret = FcPatternFormatToBuf (pat, format, &buf);
+
+    if (ret)
+	return FcStrBufDone (&buf);
+    else
+    {
+	FcStrBufDestroy (&buf);
+	return NULL;
+    }
+}
+
+#define __fcformat__
+#include "fcaliastail.h"
+#undef __fcformat__