指针的错误赋值

C语言文件读取与字符串搜索

最新推荐文章于 2022-03-31 10:00:21 发布

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最新推荐文章于 2022-03-31 10:00:21 发布

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分类专栏： C/C++编程

本文链接：https://blog.youkuaiyun.com/cwg_1992/article/details/10204229

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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
main()
{
   FILE * fp;
   char *line = NULL;
   char *dst = "kernel";
   char *word[8192];
   int rownum = 0;
   int wordid = 0;
   int status = 0;
   int i, j;
   size_t len = 0;
   fp = fopen("./cai.txt", "r");
   //fp = fopen("/var/log/messages", "r");
   for (i = 0; i <= 255; i++)
       word[i] = NULL;
   if (fp == NULL) {
       printf("打开文件\"/var/log/messages\"不存在或无权访问！\n");
       return 1;
   }
   while (getline(&line, &len, fp) != -1) {
       rownum++;
       wordid++;
       if(strstr(line, dst) != NULL) {
           for (j = 0; j <= wordid; j++) {
               if (line == word[j]) {
                   status++;
               }
           }
           if (status == 0) {
               word[wordid] = line;    //此处两个值都是指针如果这么赋值的话 word[wordid]和line是同一个指针，如果将a指针的值付给b指针应该是*a=*b这样
               printf("3#This line is new:%d \t %s", rownum, line);
           }
           status = 0;
       }
   }
   return 0;
}