8.函数名: strdup

功  能: 将串拷贝到新建的位置处
用  法: char *strdup(char *str);
程序例:

#include <stdio.h>
#include <string.h>
#include <alloc.h>
int main(void)
 {
    char *dup_str, *string = "abcde";
    dup_str = strdup(string);
    printf("%s
", dup_str);
    free(dup_str);
    return 0;
 }

9.函数名: stricmp

功  能: 以大小写不敏感方式比较两个串
用  法: int stricmp(char *str1, char *str2);
程序例:

#include <string.h>
#include <stdio.h>
int main(void)
{
   char *buf1 = "BBB", *buf2 = "bbb";
   int ptr;
   ptr = stricmp(buf2, buf1);
   if (ptr > 0)
      printf("buffer 2 is greater than buffer 1
");
   if (ptr < 0)
      printf("buffer 2 is less than buffer 1
");
   if (ptr == 0)
      printf("buffer 2 equals buffer 1
");
   return 0;
}

10.函数名: strerror

功  能: 返回指向错误信息字符串的指针
用  法: char *strerror(int errnum);
程序例:

#include <stdio.h>
#include <errno.h>
int main(void)
{
   char *buffer;
   buffer = strerror(errno);
   printf("Error: %s
", buffer);
   return 0;
}

11.函数名: strcmpi

功  能: 将一个串与另一个比较, 不管大小写
用  法: int strcmpi(char *str1, char *str2);
程序例:

#include <string.h>
#include <stdio.h>
int main(void)
{
   char *buf1 = "BBB", *buf2 = "bbb";
   int ptr;
   ptr = strcmpi(buf2, buf1);
   if (ptr > 0)
      printf("buffer 2 is greater than buffer 1
");
   if (ptr < 0)
      printf("buffer 2 is less than buffer 1
");
   if (ptr == 0)
      printf("buffer 2 equals buffer 1
");
   return 0;
}