C programming language string manipulation functions common IX

 

sscanf (): a long string may be divided into a desired format on demand

Example:

#include<stdio.h>
#include<string.h>
int main()
{
    // string 1. Take specified length 
    char STR [ 100 ];
    sscanf("12345","%4s",str);
    printf("%s\n",str);//1234

    // 2. Formatting time 
    int year, month The, Day, hour, minute, SECOND;
    sscanf("2013/02/13 14:55:34","%d/%d/%d %d:%d:%d",&year, &month, &day, &hour, &minute, &second);
    printf("time=%d-%d-%d %d:%d:%d\n", year, month, day, hour, minute, second);//time=2013-2-13 14:55:34
    
    // 3.% D and% * s * Added (*) means skip the data is not read (i.e. the data is not read into the parameter) 
    sscanf ( " 1234ABCD " , " % S% D * " , STR); // herein denotes% d skip data, that is skipped: 1234 
    the printf ( " % S \ n- " , STR); // ABCD
    
    // 4 to take up the specified character string. As the example shown, face '+' until the string 
    sscanf ( " 1234 + ABC " , " % [^ +] " , STR);
    printf("%s\n",str);// 1234
    
    // 5. Take the string until the specified character set. In case of the string until the lowercase letters. 
    sscanf ( " 1234 + ABC1234 " , " % [^ AZ] " , STR);
    printf("%s\n",str);// 1234+
    
    // 6. Take strings containing only the specified character set. (Containing only take lower case letters and numbers string of continuous string is acquired). 
    sscanf ( " 123456abcdefBFRGTY7890 " , " % [1-9a-Z] " , STR);
    printf("%s\n",str);// 123456abcdef
    
    return 0;
}    

 

 

Practical application:

Pclist_info read content file, 90: 2b: 34: 67: 2b: 43 [192.168.10.111] [] [] [0 1900/01/00 00:00:00] [Wire] [STATIC] [Online] [] [] [Used]

This function encountered a problem when encountered, [] when the first symbol, which is empty, you can not get back up

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>



typedef struct {
    char hostClass[8];
    char hostMAC[20];
    char hostDHCPName[70];
    char hostDevName[70];
    char hostIP[20];
    char hostConnectInterface[8];
    char hostOnlineTime[64];
    char hostStotageAccessStatus[8];
}CMCCLanHostInfo;

    int main(void)
    {
        FILE *fp = NULL;
        char line[512] = {0};
        int i=0;
        struct tm timeinfo={0};
        CMCCLanHostInfo tmp_lhi={0};
        char if_mac[20]={0};
        char contype[20]={0};
        char conssid[20]={0};
        char ip_addressing[20]={0};
        char time[128] ="";
        char *p = NULL;
        char dest[] = "[]";
        if ((fp = fopen("pclist_info", "r")) == NULL) {
            printf("%s", "Cannot open pclist_info file!\n");
            return 0;
        }
        if(fgets(line, sizeof(line)-1 , fp) != NULL )
        {
            line[strlen(line)-1] = '\0';
            
// 90:2b:34:67:2b:43 [192.168.10.111] [0] [1] [0 1900/01/00 00:00:00] [Wire] [STATIC] [Online] 
            sscanf(line, "%[^]%*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]] %*[^[][%[^]]",
                        tmp_lhi.hostMAC,
                        tmp_lhi.hostIP,
                        tmp_lhi.hostDevName,
                        tmp_lhi.hostDHCPName,
                        time,
                        contype,
                        ip_addressing,
                        tmp_lhi.hostClass,
                        tmp_lhi.hostConnectInterface,
                        conssid,
                        tmp_lhi.hostStotageAccessStatus);
            printf("hostMAC = %s \n",tmp_lhi.hostMAC);
            printf("hostIP = %s \n",tmp_lhi.hostIP);
            printf("hostDevName = %s \n",tmp_lhi.hostDevName);
            printf("hostDHCPName = %s \n",tmp_lhi.hostDHCPName);
            printf("time = %s \n",time);
            printf("contype = %s \n",contype);
            printf("ip_addressing = %s \n",ip_addressing);
            printf("hostClass = %s \n",tmp_lhi.hostClass);
            printf("hostConnectInterface = %s \n",tmp_lhi.hostConnectInterface);
            printf("conssid = %s \n",conssid);
            printf("hostStotageAccessStatus = %s \n",tmp_lhi.hostStotageAccessStatus);

        }
        
        fclose(fp);
        return 0;
    }