utfecpy.c (1159B)
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 "plan9.h" 17 #include "utf.h" 18 19 #include <stdarg.h> 20 #include <string.h> 21 22 char* utfecpy(char* to, char* e, char* from) { 23 char* end; 24 25 if (to >= e) 26 return to; 27 end = memccpy(to, from, '\0', e - to); 28 if (end == nil) { 29 end = e - 1; 30 while (end > to && (*--end & 0xC0) == 0x80) 31 ; 32 *end = '\0'; 33 } else { 34 end--; 35 } 36 return end; 37 }