字符分割函数

char *strsep(char **stringp, const char *delim)
{
    char *s;
    const char *spanp;
    int c, sc;
    char *tok;
    if ((s = *stringp)== NULL)
        return (NULL);
    for (tok = s;;) 
　　 {
        c = *s++;
        spanp = delim;
        do 
　　　　 {
            if ((sc =*spanp++) == c)
　　　　　　  {
                if (c == 0)
                    s = NULL;
                else
                    s[-1] = 0;
                *stringp = s;
                return (tok);
            }
        } while (sc != 0);
    }
}
测试：

int main (void)
{
    char *pString = "1234;123.112.123.123:8081;GPSDATA;;60;19200;8;N;1;N";
    char *pStrTmp[20]={NULL};
    int i=0;
    pStrTmp[i] = strsep(&pString,";");
    while((pStrTmp[i] != NULL)&&(i<19))
　　{
         i++;
         pStrTmp[i] = strsep(&pString,";");
          printf("pStrTmp[%d] = %s\n",pStrTmp[i] );
   }
   return 0;
}

运行结果:
pStrTmp[0] = "1234";
pStrTmp[1] = "123.112.123.123:8081";
pStrTmp[2] = "GPSDATA";
pStrTmp[3] = "";
pStrTmp[4] = "60";
pStrTmp[5] = "19200";
pStrTmp[6] = "8";
pStrTmp[7] = "N";
pStrTmp[8] = "1";
pStrTmp[9] = "N";