fread fgets feof 读文件到buf里面

待我称王封你为后i 2022-05-25 06:20 155阅读 0赞

从dhcp.leases读文件，每次读一行，fgets，写到dst\_dhcp\_list指向的buf里面。

feof(fp)有两个返回值:如果遇到文件结束，函数feof(fp)的值为非零值，否则为0。

int conf_get_dhcp_list1_new(char* dst_dhcp_list)
    {
        FILE *f=NULL;
        char line_buffer[256]={0};
        my_printf(LOG_MODE_LEVEL_1, "%s(%d) sizeof(line_buffer):%d\n",__FUNCTION__,__LINE__,sizeof(line_buffer));
    
        if ((f = fopen("/tmp/dhcp.leases", "r")) != NULL)
        {
    
            while (!feof(f)) // If the file ends, the value of the function feof(fp) is non-zero, otherwise 0.
            {
               fgets(line_buffer,sizeof(line_buffer),f);
               strcat(dst_dhcp_list, line_buffer);
               my_printf(LOG_MODE_LEVEL_1, "%s(%d) conf_get_dhcp_list1 accessed and dst_dhcp_list is:\n%s\n",__FUNCTION__,__LINE__,dst_dhcp_list);
            }
    
        }
    
        fclose(f);
        return 0;
    }

while(fgets(wifimac, sizeof(wifimac), fd) != NULL)
        {
            if(strncmp(uppermac,wifimac,17) == 0)
            {
    
                my_printf(1, "%s(%d) COMPARE SUCCESED wifiMAC is %s uppermac is %s \n",__FUNCTION__,__LINE__,wifimac,uppermac);
                return 1;
            }   
            my_printf(1, "%s(%d) wifiMAC is %s mac is %s \n",__FUNCTION__,__LINE__,wifimac,uppermac);
    
        }

--------------------

#include <stdio.h>
    #include <string.h>
    #include <unistd.h> 
    
    /***************************************************************** *Function: get_system_output *Description:call the system command,gets the return value of the command. *Input:cmd *Input:size *Output:output *****************************************************************/
    static int get_system_output(char *cmd, char *output, int size)
    {
        FILE *fp=NULL;  
        fp = popen(cmd, "r");   
        if (fp)
        {       
            if(fgets(output, size, fp) != NULL)
            {       
                if(output[strlen(output)-1] == '\n')            
                    output[strlen(output)-1] = '\0';    
            }   
            pclose(fp); 
        }
        return 0;
    }
    
    
    int main(int argc, char **argv)
    {
    
        char *p_file="./data.txt";  
        char *p_file_bck="./data.bck";  
        FILE *f=NULL;
        char str[1024]={
       0};
        char line_buffer[1024]={
       0};
        char *p_line_buffer = NULL;
        char *pcmd = NULL;
        char cmd[1024]={
       0};
        char file_info[64][1024]={
       '0'};
        char *p=NULL;
        int i=0,j=0;
    
        if (access(p_file,R_OK) !=0 )
        {
            printf(">>>>>>>>>>./data.txt ERROR! \n");
            return;
        }
    
        system("awk '{print($2)}' ./data.txt > ./data.bck");
    
    
        if ((f = fopen(p_file_bck, "r")) != NULL)
        {
            while (fgets(line_buffer,sizeof(line_buffer),f),!feof(f)) // If the file ends, the value of the function feof(fp) is non-zero, otherwise not file end 0.
            {
              // fgets(line_buffer,sizeof(line_buffer),f); //fread(line_buffer, 1024, 1, f);
    
               memset(str, 0x0, sizeof(str));
               strcpy(str, line_buffer);
    
               if ( (str[strlen(str)-2] == '\n')  || (str[strlen(str)-2] == '\r') )
                   str[strlen(str)-2]='\0'; 
    
               if ( (str[strlen(str)-1] == '\n') || (str[strlen(str)-1] == '\r') )
                   str[strlen(str)-1]='\0'; 
    
               //copy to ~/lin/push_code/
               memset(&cmd, 0x0, sizeof(cmd));
               strcat(cmd, "cp ");
               strcat(cmd, str);
               strcat(cmd, " ~/lin/push_code/");
               printf("###copy to:%s\n",cmd);
               //system(cmd);
    
    
    #if 1 
               //svn di to ~/lin/push_code/
               memset(&cmd, 0x0, sizeof(cmd));
               strcat(cmd, "svn di ");
               strcat(cmd, str);
               strcat(cmd, " > ~/lin/push_code/diff");
    
               p = strrchr(str, '/');
               //printf("###p:\n%s\n",p);
               strcat(cmd, p);
              // system(cmd);
               printf("###svn di to:%s\n",cmd);
    #endif 
    
            }
    
        }
        else
        {
            printf(">>>>>>>>>>./data.txt ERROR!! \n");
        }
    
    
        return 0;
    }