Skip to content

Clean up string creation via smprintf and strdup #131

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
dgraziotin merged 1 commit into from
Oct 4, 2017
Merged

Clean up string creation via smprintf and strdup #131

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
70 changes: 31 additions & 39 deletions src/mbpfan.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
*/


#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
Expand Down Expand Up @@ -61,6 +62,29 @@ t_sensors* sensors = NULL;
t_fans* fans = NULL;


static char *smprintf(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
static char *smprintf(const char *fmt, ...)
{
char *buf;
int cnt;
va_list ap;

// find buffer length
va_start(ap, fmt);
cnt = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (cnt < 0) {
return NULL;
}

// create and write to buffer
buf = malloc(cnt + 1);
va_start(ap, fmt);
vsnprintf(buf, cnt + 1, fmt, ap);
va_end(ap);
return buf;
}

bool is_legacy_sensors_path()
{
struct utsname kernel;
Expand Down Expand Up @@ -147,9 +171,7 @@ t_sensors *retrieve_sensors()

if (errno == EISDIR) {

path_begin = (char*) malloc(sizeof( char ) * (strlen(hwmon_path) + strlen("/temp") + 1));
strcpy(path_begin, hwmon_path);
strcat(path_begin, "/temp");
path_begin = smprintf("%s/temp", hwmon_path);

if(verbose) {
printf("Found hwmon path at %s\n", path_begin);
Expand All @@ -167,28 +189,17 @@ t_sensors *retrieve_sensors()

const char *path_end = "_input";

int path_size = strlen(path_begin) + strlen(path_end) + 2;
char number[2];
sprintf(number,"%d",0);

int sensors_found = 0;

int counter = 0;
for(counter = 0; counter<10; counter++) {
path = (char*) malloc(sizeof( char ) * path_size);

sprintf(number,"%d",counter);
path[0] = '\0';
strncat( path, path_begin, strlen(path_begin) );
strncat( path, number, strlen(number) );
strncat( path, path_end, strlen(path_begin) );
path = smprintf("%s%d%s", path_begin, counter, path_end);

FILE *file = fopen(path, "r");

if(file != NULL) {
s = (t_sensors *) malloc( sizeof( t_sensors ) );
s->path = (char *) malloc(sizeof( char ) * path_size);
strcpy(s->path, path);
s->path = strdup(path);
fscanf(file, "%d", &s->temperature);

if (sensors_head == NULL) {
Expand Down Expand Up @@ -248,39 +259,20 @@ t_fans *retrieve_fans()
const char *path_output_end = "_output";
const char *path_man_end = "_manual";

int path_min_size = strlen(path_begin) + strlen(path_output_end) + 2;
int path_man_size = strlen(path_begin) + strlen(path_man_end) + 2;
char number[2];
sprintf(number,"%d",0);

int counter = 0;
int fans_found = 0;

for(counter = 0; counter<10; counter++) {

path_output = (char*) malloc(sizeof( char ) * path_min_size);
path_output[0] = '\0';
path_manual = (char*) malloc(sizeof( char ) * path_man_size);
path_manual[0] = '\0';
sprintf(number,"%d",counter);

strncat( path_output, path_begin, strlen(path_begin) );
strncat( path_output, number, strlen(number) );
strncat( path_output, path_output_end, strlen(path_begin) );

strncat( path_manual, path_begin, strlen(path_begin) );
strncat( path_manual, number, strlen(number) );
strncat( path_manual, path_man_end, strlen(path_begin) );

path_output = smprintf("%s%d%s", path_begin, counter, path_output_end);
path_manual = smprintf("%s%d%s", path_begin, counter, path_man_end);

FILE *file = fopen(path_output, "w");

if(file != NULL) {
fan = (t_fans *) malloc( sizeof( t_fans ) );
fan->fan_output_path = (char *) malloc(sizeof( char ) * path_min_size);
fan->fan_manual_path = (char *) malloc(sizeof( char ) * path_man_size);
strcpy(fan->fan_output_path, path_output);
strcpy(fan->fan_manual_path, path_manual);
fan->fan_output_path = strdup(path_output);
fan->fan_manual_path = strdup(path_manual);

if (fans_head == NULL) {
fans_head = fan;
Expand Down