github.com/tcnksm/go@v0.0.0-20141208075154-439b32936367/src/lib9/utf/utflen.c (about)

     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 "utf.h"
    15  #include "utfdef.h"
    16  
    17  int
    18  utflen(const char *s)
    19  {
    20  	int c;
    21  	int n;
    22  	Rune rune;
    23  
    24  	n = 0;
    25  	for(;;) {
    26  		c = *(uchar*)s;
    27  		if(c < Runeself) {
    28  			if(c == 0)
    29  				return n;
    30  			s++;
    31  		} else
    32  			s += chartorune(&rune, s);
    33  		n++;
    34  	}
    35  }