utfecpy.c (1140B)
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 11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY 12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. 13 */ 14 #define _BSD_SOURCE 1 /* memccpy */ 15 #define _DEFAULT_SOURCE 1 16 #include <stdarg.h> 17 #include <string.h> 18 #include "plan9.h" 19 #include "utf.h" 20 21 char* 22 utfecpy(char *to, char *e, char *from) 23 { 24 char *end; 25 26 if(to >= e) 27 return to; 28 end = memccpy(to, from, '\0', e - to); 29 if(end == nil){ 30 end = e-1; 31 while(end>to && (*--end&0xC0)==0x80) 32 ; 33 *end = '\0'; 34 }else{ 35 end--; 36 } 37 return end; 38 }