LinuxC语言读取文件，分割字符串，存入链表，放入另一个文件-白红宇

LinuxC语言读取文件，分割字符串，存入链表，放入另一个文件

阅读量：5959 次

发布时间：2019-06-19

本文共 4931 字，大约阅读时间需要 16 分钟。

//file_op.c

#include 
     
       #include 
      
        #include 
       
         struct info{   int id;   char name[10];   char sex[10];   char col[10];   char sub[15];   char marks[20];   struct info * prev;   struct info * next; }; typedef struct info *st; static st head = NULL;//链表头指针 #define PRINT_ST(str) \   "info:id=%d; name=%s; sex=%s;col=%s; sub=%s; marks=%s\n",\   str->id,str->name, str->sex,str->col, str->sub, str->marks int temp = 1; int break_up(char *buffer);//分割字符串函数 int put_in(char* str[]);//放入结构体 int print_st(st str);//输出结构体，测试用 char * char_filter( char *str);//去掉行末回车符 int insert_list(st p);//插入链表 int main(void) {   FILE *stream;   char msg[100];   char backup[100];   st p1, p2;   /* open a file for update */   stream = fopen("file.txt","r");   /* seek to the start of the file */   fseek(stream, 0, SEEK_SET);//指针指向文件头部   /*备份第一行内容*/   fgets(msg, 100, stream) != NULL;   strcpy(backup, msg);   /* 从第二行开始去数据 */   while( fgets(msg, 100, stream) != NULL)   {     printf("%s",msg);     break_up(msg);     memset(msg, 0, sizeof(msg));   }   /*先读取一行内容，测试用      fgets(msg, 100, stream) != NULL;      printf("%s",msg);      break_up(msg);      */   fclose(stream);    /*正序输出链表，测试用*/   p1 = head;   puts("\n");   while( p1 != NULL)   {     print_st(p1);     p1 = p1->next;     }   /*倒序输出链表，测试用*/   p1 = head;   puts("\n");   while(p1 != NULL)   {     p2 = p1;     p1 = p1->next;   }   while(p2 != NULL)   {     print_st(p2);     p2 = p2->prev;   }      /*下面新建文件，倒叙输出到一个新文件new.txt里面*/   stream = fopen("new.txt","w+");   if(fputs(backup, stream) < 0)     {       perror("fputs error:");     }   p1 = head;   while(p1 != NULL)   {     p2 = p1;     p1 = p1->next;   }   while(p2 != NULL)   {     snprintf(msg, sizeof(msg), PRINT_ST(p2));     printf("test_char:%s\n",msg);     fputs(msg, stream);     p2 = p2->prev;   }      fclose(stream);        /*释放链表*/   p1 = head->next;   while (p1 != NULL)   {       p2 = p1;     p1 = p1->next;     free(p2);   }   free(head);   head = NULL;   return 0; } /*分割字符串*/ int break_up(char *buffer) {   int i = 0, j = 0;   char *p[20]= {NULL};   char *buf=buffer;   char *outer_ptr=NULL;   char *inner_ptr=NULL;   while((p[i]=strtok_r(buf,";",&outer_ptr))!=NULL)    {     i++;     buf=NULL;    } //  printf("Here we have %d strings\n",i);//测试用   for(j=0 ; j
        
         id = atoi(str[0]);   strcpy(st1->name, str[1]);   strcpy(st1->sex, str[2]);   strcpy(st1->col, str[3]);   strcpy(st1->sub, str[4]);   str[5] = char_filter(str[5]);   strcpy(st1->marks, str[5] );   st1->next = NULL;   st1->prev = NULL;   print_st(st1);   if(temp == 1)   {     head = st1;     temp++;       return 0;   }   insert_list(st1);   return 0; } int print_st(st str)// { /*  printf("info:id=%d; name=%s; sex=%s; col=%s; sub=%s; marks=%s\n",       str->id,str->name, str->sex, str->col, str->sub, str->marks);       */   printf(PRINT_ST(str)); }   char *char_filter( char *str) {   int i = strlen(str);   *(str + i - 1) = '\0';   return str; } int insert_list(st p) {      st q = head;   while( q->next != NULL)   {     q = q->next;   }   q->next = p;   p->prev = q;   return 0; }