--- /dev/null
+/* Iterate over previous character in UTF-16 string.
+ Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ USA. */
+
+#include <config.h>
+
+/* Specification. */
+#include "unistr.h"
+
+const uint16_t *
+u16_prev (ucs4_t *puc, const uint16_t *s, const uint16_t *start)
+{
+ /* Keep in sync with utf16-ucs4.h and utf16-ucs4.c. */
+ if (s != start)
+ {
+ uint16_t c_1 = s[-1];
+
+ if (c_1 < 0xd800 || c_1 >= 0xe000)
+ {
+ *puc = c_1;
+ return s - 1;
+ }
+#if CONFIG_UNICODE_SAFETY
+ if (c_1 >= 0xdc00)
+#endif
+ if (s - 1 != start)
+ {
+ uint16_t c_2 = s[-2];
+
+#if CONFIG_UNICODE_SAFETY
+ if (c_2 >= 0xd800 && c_2 < 0xdc00)
+#endif
+ {
+ *puc = 0x10000 + ((c_2 - 0xd800) << 10) + (c_1 - 0xdc00);
+ return s - 2;
+ }
+ }
+ }
+ return NULL;
+}
--- /dev/null
+/* Iterate over previous character in UTF-32 string.
+ Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ USA. */
+
+#include <config.h>
+
+/* Specification. */
+#include "unistr.h"
+
+const uint32_t *
+u32_prev (ucs4_t *puc, const uint32_t *s, const uint32_t *start)
+{
+ if (s != start)
+ {
+ uint32_t c_1 = s[-1];
+
+#if CONFIG_UNICODE_SAFETY
+ if (c_1 < 0xd800 || (c_1 >= 0xe000 && c_1 < 0x110000))
+#endif
+ {
+ *puc = c_1;
+ return s - 1;
+ }
+ }
+ return NULL;
+}
--- /dev/null
+/* Iterate over previous character in UTF-8 string.
+ Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ USA. */
+
+#include <config.h>
+
+/* Specification. */
+#include "unistr.h"
+
+const uint8_t *
+u8_prev (ucs4_t *puc, const uint8_t *s, const uint8_t *start)
+{
+ /* Keep in sync with utf8-ucs4.h and utf8-ucs4.c. */
+ if (s != start)
+ {
+ uint8_t c_1 = s[-1];
+
+ if (c_1 < 0x80)
+ {
+ *puc = c_1;
+ return s - 1;
+ }
+#if CONFIG_UNICODE_SAFETY
+ if ((c_1 ^ 0x80) < 0x40)
+#endif
+ if (s - 1 != start)
+ {
+ uint8_t c_2 = s[-2];
+
+ if (c_2 >= 0xc2 && c_2 < 0xe0)
+ {
+ *puc = ((unsigned int) (c_2 & 0x1f) << 6)
+ | (unsigned int) (c_1 ^ 0x80);
+ return s - 2;
+ }
+#if CONFIG_UNICODE_SAFETY
+ if ((c_2 ^ 0x80) < 0x40)
+#endif
+ if (s - 2 != start)
+ {
+ uint8_t c_3 = s[-3];
+
+ if (c_3 >= 0xe0 && c_3 < 0xf0
+#if CONFIG_UNICODE_SAFETY
+ && (c_3 >= 0xe1 || c_2 >= 0xa0)
+ && (c_3 != 0xed || c_2 < 0xa0)
+#endif
+ )
+ {
+ *puc = ((unsigned int) (c_3 & 0x0f) << 12)
+ | ((unsigned int) (c_2 ^ 0x80) << 6)
+ | (unsigned int) (c_1 ^ 0x80);
+ return s - 3;
+ }
+#if CONFIG_UNICODE_SAFETY
+ if ((c_3 ^ 0x80) < 0x40)
+#endif
+ if (s - 3 != start)
+ {
+ uint8_t c_4 = s[-4];
+
+ if (c_4 >= 0xf0 && c_4 < 0xf8
+#if CONFIG_UNICODE_SAFETY
+ && (c_4 >= 0xf1 || c_3 >= 0x90)
+ && (c_4 < 0xf4 || (c_4 == 0xf4 && c_3 < 0x90))
+#endif
+ )
+ {
+ *puc = ((unsigned int) (c_4 & 0x07) << 18)
+ | ((unsigned int) (c_3 ^ 0x80) << 12)
+ | ((unsigned int) (c_2 ^ 0x80) << 6)
+ | (unsigned int) (c_1 ^ 0x80);
+ return s - 4;
+ }
+ }
+ }
+ }
+ }
+ return NULL;
+}
--- /dev/null
+Description:
+Iterate over previous character in UTF-16 string.
+
+Files:
+lib/unistr/u16-prev.c
+
+Depends-on:
+unistr/base
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += unistr/u16-prev.c
+
+Include:
+"unistr.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+
--- /dev/null
+Description:
+Iterate over previous character in UTF-32 string.
+
+Files:
+lib/unistr/u32-prev.c
+
+Depends-on:
+unistr/base
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += unistr/u32-prev.c
+
+Include:
+"unistr.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+
--- /dev/null
+Description:
+Iterate over previous character in UTF-8 string.
+
+Files:
+lib/unistr/u8-prev.c
+
+Depends-on:
+unistr/base
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += unistr/u8-prev.c
+
+Include:
+"unistr.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+
projects / gnulib.git / commitdiff