diff options
Diffstat (limited to 'lib/unistr/u8-prev.c')
| -rw-r--r-- | lib/unistr/u8-prev.c | 92 |
1 files changed, 46 insertions, 46 deletions
diff --git a/lib/unistr/u8-prev.c b/lib/unistr/u8-prev.c index 245d22ff..97a27f55 100644 --- a/lib/unistr/u8-prev.c +++ b/lib/unistr/u8-prev.c @@ -1,5 +1,5 @@ /* Iterate over previous character in UTF-8 string. - Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc. + Copyright (C) 2002, 2006-2007, 2009-2010 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 @@ -29,65 +29,65 @@ u8_prev (ucs4_t *puc, const uint8_t *s, const uint8_t *start) uint8_t c_1 = s[-1]; if (c_1 < 0x80) - { - *puc = c_1; - return s - 1; - } + { + *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 (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 (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) + if ((c_2 ^ 0x80) < 0x40) #endif - if (s - 2 != start) - { - uint8_t c_3 = s[-3]; + if (s - 2 != start) + { + uint8_t c_3 = s[-3]; - if (c_3 >= 0xe0 && c_3 < 0xf0 + if (c_3 >= 0xe0 && c_3 < 0xf0 #if CONFIG_UNICODE_SAFETY - && (c_3 >= 0xe1 || c_2 >= 0xa0) - && (c_3 != 0xed || c_2 < 0xa0) + && (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; - } + ) + { + *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) + if ((c_3 ^ 0x80) < 0x40) #endif - if (s - 3 != start) - { - uint8_t c_4 = s[-4]; + if (s - 3 != start) + { + uint8_t c_4 = s[-4]; - if (c_4 >= 0xf0 && c_4 < 0xf8 + 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)) + && (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; - } - } - } - } + ) + { + *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; } |