1 /* 2 * The authors of this software are Rob Pike and Ken Thompson. 3 * Copyright (c) 2002 by Lucent Technologies. 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose without fee is hereby granted, provided that this entire notice 6 * is included in all copies of any software which is or includes a copy 7 * or modification of this software and in all copies of the supporting 8 * documentation for such software. 9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED 10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY 11 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY 12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. 13 */ 14 #include <stdarg.h> 15 #include <string.h> 16 #include "utf.h" 17 #include "utfdef.h" 18 19 static void* 20 memccpy(void *a1, void *a2, int c, ulong n) 21 { 22 uchar *s1, *s2; 23 24 s1 = a1; 25 s2 = a2; 26 c &= 0xFF; 27 while(n > 0) { 28 if((*s1++ = *s2++) == c) 29 return s1; 30 n--; 31 } 32 return 0; 33 } 34 char* 35 utfecpy(char *to, char *e, char *from) 36 { 37 char *end; 38 39 if(to >= e) 40 return to; 41 end = memccpy(to, from, '\0', e - to); 42 if(end == nil){ 43 end = e-1; 44 while(end>to && (*--end&0xC0)==0x80) 45 ; 46 *end = '\0'; 47 }else{ 48 end--; 49 } 50 return end; 51 } 52