/* Check UTF-8 string. Copyright (C) 2002, 2006-2007 Free Software Foundation, Inc. Written by Bruno Haible , 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 /* Specification. */ #include "unistr.h" const uint8_t * u8_check (const uint8_t *s, size_t n) { const uint8_t *s_end = s + n; while (s < s_end) { /* Keep in sync with unistr.h and utf8-ucs4.c. */ uint8_t c = *s; if (c < 0x80) { s++; continue; } if (c >= 0xc2) { if (c < 0xe0) { if (s + 2 <= s_end && (s[1] ^ 0x80) < 0x40) { s += 2; continue; } } else if (c < 0xf0) { if (s + 3 <= s_end && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 && (c >= 0xe1 || s[1] >= 0xa0) && (c != 0xed || s[1] < 0xa0)) { s += 3; continue; } } else if (c < 0xf8) { if (s + 4 <= s_end && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 && (s[3] ^ 0x80) < 0x40 && (c >= 0xf1 || s[1] >= 0x90) #if 1 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) #endif ) { s += 4; continue; } } #if 0 else if (c < 0xfc) { if (s + 5 <= s_end && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 && (c >= 0xf9 || s[1] >= 0x88)) { s += 5; continue; } } else if (c < 0xfe) { if (s + 6 <= s_end && (s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 && (s[5] ^ 0x80) < 0x40 && (c >= 0xfd || s[1] >= 0x84)) { s += 6; continue; } } #endif } /* invalid or incomplete multibyte character */ return s; } return NULL; }