c语言判断是否是utf8字符串，计算字符个数

 

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#include <stdio.h> #include <string.h> #include <stdlib.h>   /**************************************************************************** Unicode符号范围 | UTF-8编码方式     (十六进制) | （二进制) 0000 0000-0000 007F:0xxxxxxx 0000 0080-0000 07FF:110xxxxx 10xxxxxx 0000 0800-0000 FFFF:1110xxxx 10xxxxxx 10xxxxxx 0001 0000-001F FFFF:11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 0020 0000-03FF FFFF:111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 0400 0000-7FFF FFFF:1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx **************************************************************************/   unsigned char utf8_look_for_table[] =     {         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,         2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,         2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,         3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,         4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1};   #define UTFLEN(x) utf8_look_for_table[(x)]   //根据首字节,获取utf8字符所占字节数 inline int GetUtf8charByteNum(unsigned char ch) {     int byteNum = 0;       if (ch >= 0xFC && ch < 0xFE)         byteNum = 6;     else if (ch >= 0xF8)         byteNum = 5;     else if (ch >= 0xF0)         byteNum = 4;     else if (ch >= 0xE0)         byteNum = 3;     else if (ch >= 0xC0)         byteNum = 2;     else if (0 == (ch & 0x80))         byteNum = 1;       return byteNum; }   //判断字符串是否是utf8格式 int IsUtf8Format(const char *str) {     int byteNum = 0;     unsigned char ch;     const char *ptr = str;       if (NULL == str)         return 0;       while (*ptr != '\0')     {         ch = (unsigned char)*ptr;         if (byteNum == 0) //根据首字节特性判断该字符的字节数         {             if (0 == (byteNum = GetUtf8charByteNum(ch)))                 return 0;         }         else //多字节字符,非首字节格式:10xxxxxx         {             if ((ch & 0xC0) != 0x80)                 return 0;         }         byteNum--;         ptr++;     }       if (byteNum > 0)         return 0;       return 1; }   //计算utf8字符串字符个数 int GetUtf8Length(char *str) {     int clen = 0;     int len = 0;     int byteNum = 0;     unsigned char ch;     char *ptr = str;       if (NULL == str)         return 0;       clen = strlen(str);     while (*ptr != '\0' && len < clen)     {         ch = (unsigned char)*ptr;         if (0 == (byteNum = GetUtf8charByteNum(ch)))             return 0;         ptr += byteNum;         len++;     }       return len; }   int GetChargeNum(int len) {     int num = 0;       if (len > 70 && len <= 500)     {         if (!len % 67)             num = len / 67;         else             num = len / 67 + 1;     }     else if (len > 0)         num = 1;       return num; }   int main(int argc, char **argv) {     //char *str = "hello 你好呀！";     char *str;     int len = 0;     int num = 0;       if (argc < 2)         return 0;       str = argv[1];     printf("%s\n", str);       if (!IsUtf8Format(str))     {         printf("the text is not the Format of utf8\n");         return 0;     }       if (!(len = GetUtf8Length(str)))         return 0;     printf("the length of text: %d\n", len);       if (!(num = GetChargeNum(len)))         return 0;     printf("the chargeNumber of sms: %d\n", num);       return 1; }

　　

 

参考：

http://blog.sina.com.cn/s/blog_62b2318d0101d7kb.html

http://www.cnblogs.com/jiu0821/p/6371544.html