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Patrick FELIX-VIMALARATNAM
2025-09-15 17:35:35 +02:00
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## Nombre de complexité selon le fichier
# daemon.c
create_daemon = 5
ping_request = 2
send_check = 4
check_keep_working = 4
daemon_work = 3
# db-sqlite.c
db_connect = 1
db_disconnect = 1
insert_hourly_report = 1
# ping-report
main = 4
# stats.c
get_ping_from_temp_log = 14
write_ping_log = 5
set_stats_ping = 11
# utils.c
write_pid_file = 2
remove_file = 1
## Algorythme des fonction avec une complexité supérieur ou égale à 6
voir sur draw.io avec les fichiers.
## Optimisation du code sur la complexité cyclomatique
Le résultat de cet exercice se trouve dans le fichier stats_corrigé.c
# get_ping_from_temp_log
Pour cela on a factoriser la partie avec le while dans la fonction get_ping_from_temp_log_correction.
# set_stats_ping
Pour cela on a factoriser la partie ou l'on regarde la marge dans lequel se trouve ping dans la fonction set_stats_ping_correction.

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stats_corrigé.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <regex.h>
#include "../include/utils.h"
#include "../include/stats.h"
#include "../include/db-sqlite.h"
void get_ping_from_temp_log(char* read_line, size_t n, FILE* fd,
regex_t* p_reg, regmatch_t* pmatch, size_t nmatch, char* ping,
int start, int end, size_t size_ping){
/* Read file */
while(getline(&read_line,&n,fd) != -1){
if(read_line == NULL){
break;
}
/* Exec regex to find ping */
if(regexec(p_reg,read_line,nmatch,pmatch,0) == 0){
/* Extract ping position from read line */
start = (int) pmatch[1].rm_so;
end = (int) pmatch[1].rm_eo;
size_ping = (size_t) (end - start);
/* ping string memory allocation */
ping = malloc(sizeof(char) * (size_ping+2));
if(ping == NULL){
free(read_line);
read_line = NULL;
n = 0;
break;
}
/* Create ping string */
(void) strncpy(ping, &read_line[start], size_ping);
ping[size_ping]='\n';
ping[size_ping+1]='\0';
/* Free memory */
free(read_line);
read_line = NULL;
n = 0;
break;
}
free(read_line);
read_line = NULL;
n = 0;
}
}
/*
-- get_ping_from_temp_log --
Desc :
Function which get the ping from a temp log containing the last ping did by the program
In-param :
None
Out-param :
None
Return value :
Ping value as a string or NULL if an error occured
*/
/*@null@*/char* get_ping_from_temp_log(){
/* Variables */
FILE* fd = NULL;
char* read_line = NULL;
size_t n = 0;
size_t nmatch = 2;
regex_t *p_reg;
regmatch_t* pmatch;
char* ping = NULL;
int start;
int end;
size_t size_ping;
/* regex struct memory allocation */
p_reg = (regex_t *) malloc(sizeof(*p_reg));
if(p_reg == NULL){
return ping; /* NULL */
}
/* Open ping log file */
fd = fopen("/var/log/ping-report/last-ping.log","r");
if(fd == NULL){
free(p_reg);
return ping; /* NULL */
}
/* Construct regex to get ping from log file */
if(regcomp(p_reg,"time=(.*) ms",REG_EXTENDED) != 0){
if(p_reg != NULL){
free(p_reg);
}
(void) fclose(fd);
return ping; /* NULL */
}
/* match info memory allocation */
pmatch = malloc(sizeof(*pmatch) * nmatch);
if(pmatch == NULL){
(void) fclose(fd);
regfree(p_reg);
free(p_reg);
return ping; /* NULL */
}
get_ping_from_temp_log(&read_line, &n, &fd,
&p_reg, &pmatch, nmatch, &ping,
start, end, size_ping);
/* free allocated memory */
regfree(p_reg);
free(p_reg);
free(pmatch);
if(read_line != NULL){
free(read_line);
}
(void) fclose(fd);
/* ping may be null, then it must mean that the ping request was lost */
return ping;
}
/*
-- write_ping_log --
Desc :
Function which write a given ping in log file
In-param :
new_ping : string value of a ping
Out-param :
None
Return value :
None
*/
void write_ping_log(char* new_ping){
/* Variables */
FILE* fd;
/* Open log file */
fd = fopen("/var/log/ping-report/all-ping.log","a+");
if(fd != NULL){
if(new_ping == NULL){
new_ping = (char *) malloc(5*sizeof(char));
if(new_ping == NULL){
(void) fclose(fd);
return;
}
(void) snprintf(new_ping,5*sizeof(char),"LOSS");
}
(void) fwrite(new_ping, sizeof(char), strlen(new_ping), fd);
(void) fclose(fd);
}else{
perror("write ping : ");
}
free(new_ping);
}
void set_stats_ping_correction(int ping, int* max, int* min, int* nb_high){
/* Max ping */
if(ping > max){
max = ping;
}
/* Min ping */
if(ping < min){
min = ping;
}
/* Number of ping above 100 ms */
if(ping > 100.0){
nb_high++;
}
}
/*
-- set_stats_ping --
Desc :
Function which calculate statistics about ping values, from log file.
In-param :
None
Out-param :
None
Return value :
None
*/
void set_stats_ping(){
/* Variables */
FILE* fd;
/* Open log file */
fd = fopen("/var/log/ping-report/all-ping.log","r");
if(fd != NULL){
/* Stats variables */
double ping = 0.0;
double sum = 0.0;
double max = 0.0;
double min = 100.0;
double mean = 0.0;
int nb_high = 0;
int nb_loss = 0;
int nb_ping = 0;
char* read_line = NULL;
size_t n = 0;
/* Read file */
while(getline(&read_line,&n,fd) != -1){
/* Check getline error */
if(read_line == NULL){
break;
}
/* Check if the ping is flagged as LOSS */
if(strcmp(read_line,"LOSS") == 0){
nb_loss++;
}else{
/* Evaluate the ping as a double */
ping = strtod(read_line,NULL);
/* Test null ping */
if(ping < 0.1){
/* Ignore null ping */
}else{
/* Number of ping readed (for mean calculation) */
nb_ping++;
set_stats_ping_correction(ping, &max, &min, &nb_high);
/* Sum (for mean calculation) */
sum += ping;
}
}
free(read_line);
n = 0;
}
/* Mean calculation */
mean = sum / (double) nb_ping;
(void) fclose(fd);
insert_hourly_report(mean,max,min,nb_high,nb_loss,nb_ping);
if(read_line != NULL){
free(read_line);
}
}else{
perror("stats : ");
}
}