C++ 字符串操作常见函数

 //字符串拷贝,排除指定字符
 char *strcpy_exclude_char(char *dst, const int dst_len, const char *src, const char *exclude_list)
 {
     int i = , j = , flag = ;
     const char *p = NULL;
     if (dst == NULL && src == NULL)return NULL;
     if (dst == src)return dst;
     for (; j < dst_len && src[i] != '\0'; ++i)
     {
         flag = ;
         p = exclude_list;
         while (p && *p != '\0')
         {
             if (*p == src[i]){ flag = ; break; }
             p++;
         }
         if (flag == )dst[j++] = src[i];
     }
     dst[j] = '\0';
     return dst;
 }

 //字符串拷贝,替换指定字符
 char *strcpy_replace_char(char *dst, const int dst_len, const char *src, char aim, char rep)
 {
     int i = ;
     if (dst == NULL && src == NULL)return NULL;
     if (dst == src)return dst;
     for (; i < dst_len  && src[i] != '\0'; ++i)
     {
         if (src[i] == aim)
         {
             dst[i] = rep;
         }
         else
         {
             dst[i] = src[i];
         }
     }
     dst[i] = '\0';
     return dst;
 }

//字符串原址替换指定字符
char * str_replace_char(char *dst, char aim, char rep)
{
    int i = ;
    if (dst == NULL)return NULL;
    for (; dst[i] != '\0';++i)
    {
        if (dst[i] == aim)
        {
            dst[i] = rep;
        }
    }
    return dst;
}