summaryrefslogtreecommitdiff
path: root/libguile/extchrs.c
diff options
context:
space:
mode:
Diffstat (limited to 'libguile/extchrs.c')
-rw-r--r--libguile/extchrs.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/libguile/extchrs.c b/libguile/extchrs.c
new file mode 100644
index 000000000..44d9a14a1
--- /dev/null
+++ b/libguile/extchrs.c
@@ -0,0 +1,146 @@
+/* Copyright (C) 1995,1996 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
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of GUILE.
+ *
+ * The exception is that, if you link the GUILE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the GUILE library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by the
+ * Free Software Foundation under the name GUILE. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * GUILE, as the General Public License permits, the exception does
+ * not apply to the code that you add in this way. To avoid misleading
+ * anyone as to the status of such modified files, you must delete
+ * this exception notice from them.
+ *
+ * If you write modifications of your own for GUILE, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice.
+ */
+
+
+#include "extchrs.h"
+
+
+
+#ifdef FAKE_EXT_SCM_CHARS
+
+#ifdef __STDC__
+int
+xmblen (const char * str, size_t size)
+#else
+int
+xmblen (str, size)
+ const char * str;
+ size_t size;
+#endif
+{
+ if (!str)
+ return 0;
+
+ if (*(unsigned char *)str > 127)
+ return ((size < 4)
+ ? -1
+ : 4);
+ else if (!*str)
+ return 0;
+ else
+ return 1;
+}
+
+#ifdef __STDC__
+int
+xwctomb (char * _str, int c)
+#else
+int
+xwctomb (_str, c)
+ char * _str;
+ int c;
+#endif
+{
+ unsigned char * str;
+ str = (unsigned char *)_str;
+ if (!str)
+ return 0;
+
+ if (!c)
+ {
+ *str = 0;
+ return 0;
+ }
+
+
+ if (c < 127)
+ {
+ *str = c;
+ return 1;
+ }
+
+ str[0] = 255;
+ str[1] = 0x80 | ((c >> 10) & 0x3f);
+ str[2] = 0x80 | ((c >> 4) & 0x3f);
+ str[3] = 0x80 | (c & 0xf);
+ return 4;
+}
+
+#ifdef __STDC__
+int
+xmbtowc (xwchar_t * result, const unsigned char * _str, size_t size)
+#else
+int
+xmbtowc (result, str, size)
+ xwchar_t * result;
+ const unsigned char * _str;
+ size_t size;
+#endif
+{
+ const unsigned char * str;
+ str = (const unsigned char *)_str;
+ if (!str)
+ return 0;
+
+ if ((size == 0) || !*str)
+ {
+ *result = 0;
+ return 0;
+ }
+
+ if (*str < 128)
+ {
+ *result = *str;
+ return 1;
+ }
+
+ if ( (*str != 255)
+ || (size < 4))
+ return -1;
+
+ *result = ( ((str[1] & 0x3f) << 10)
+ | ((str[2] & 0x3f) << 4)
+ | (str[3] & 0xf));
+ return 4;
+}
+
+#endif /* FAKE_EXT_SCM_CHARS */
+