On 01/06/2016 07:59 PM, Edward Bartolo <[email protected]> wrote:
Hi,
I can't free the memory of some pointers ( *cad2 and *res) in
netman-gtk3. This is what i get:
~$ gcc main.c -o main
~$ ./main
*** Error in `./main': munmap_chunk(): invalid pointer:
0x0000000001bfdab4 ***
Aborted
See the comented lines 119 and 120 in the attached file.
The textual output of this applications shows the caracteristics of the
available active wifis.
Any hints?
Aitor.
Note: you need to install the backend of netman.
This is the code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int N;
int scan_dim();
void scan_buffer (char **ptr, char *command, char *name, char *str1,
char *str2);
int main(int argc, char **argv)
{
int i;
char **_essid, **_address, **_quality;
N=scan_dim();
_essid = (char**)malloc(N*sizeof(char*));
if(!_essid) {printf("Fallo de asignación de memoria\n"); exit(-1);}
_address = (char**)malloc(N*sizeof(char*));
if(!_address) {printf("Fallo de asignación de memoria\n"); exit(-1);}
_quality = (char**)malloc(N*sizeof(char*));
if(!_quality) {printf("Fallo de asignación de memoria\n"); exit(-1);}
scan_buffer (_essid, "/usr/lib/netman/bin/backend 8", "ESSID:",
"\"", "\"");
scan_buffer (_quality, "/usr/lib/netman/bin/backend 8", "Quality=",
"=" , "Signal level");
scan_buffer (_address, "/usr/lib/netman/bin/backend 8", "Address:", "
" , "\"");
for(i=0; i<N; i++)
{
printf("%s\n", _essid[i]);
free(_essid[i]);
}
for(i=0; i<N; i++)
{
printf("%s\n", _address[i]);
free(_address[i]);
}
for(i=0; i<N; i++)
{
printf("%s\n", _quality[i]);
free(_quality[i]);
}
free(_essid);
free(_address);
free(_quality);
system("rm -f output");
return 0;
}
void scan_buffer (char **ptr, char *command, char *name, char *str1,
char *str2)
{
FILE *fp;
char *cad1, *cad2, *res;
cad1=(char*)malloc(1024*sizeof(char));
if(!cad1) {printf("Fallo de asignación de memoria\n"); exit(-1);}
cad2=(char*)malloc(1024*sizeof(char));
if(!cad2) {printf("Fallo de asignación de memoria\n"); exit(-1);}
res=(char*)malloc(1024*sizeof(char));
if(!res) {printf("Fallo de asignación de memoria\n"); exit(-1);}
fp = fopen("output", "r");
if(!fp) exit(-1);
int cont=0;
while (fgets(cad1, 1024, fp))
{
if(strstr((char *) cad1, name))
{
cad2 = strstr((char *) cad1, name);
res = strstr((char *) cad2, str1);
if(name!="Address:")
{
int bool=0;
int i=0;
int n,m;
while ((bool!=1) && (res[i]!='\0'))
{
if(str2[0]==res[i])
{
m=i; n=0;
while ((bool!=1) && (str1[n]==res[m]))
{
n++; m++;
if (n == strlen(res)) bool=1;
}
}
i++;
}
for (i=(m-n); res[i]!='\0';i++) res[i]='\0';
}
else res[18]='\0';
int j=0;
while(j<strlen(res)) {res[j]=res[j+1]; j++;}
res[j]='\0';
j=1;
while(res[strlen(res)-j]==' ') {res[strlen(res)-j]='\0'; j++;}
ptr[cont] = (char*)malloc(strlen(res)*sizeof(char));
if(!ptr[cont]) {printf("Fallo de asignación de memoria\n");
exit(-1);}
strcpy(ptr[cont], res);
ptr[cont][strlen(res)]='\0';
cont++;
}
}
free(cad1);
// free(cad2);
// free(res);
fclose(fp);
return;
}
int scan_dim ()
{
FILE *fp, *fp1;
char *cad1, *cad2;
cad1=(char*)malloc(1024*sizeof(char));
if(!cad1) {printf("Fallo de asignación de memoria\n"); exit(-1);}
cad2=(char*)malloc(1024*sizeof(char));
if(!cad2) {printf("Fallo de asignación de memoria\n"); exit(-1);}
fp = popen("/usr/lib/netman/bin/backend 8", "r");
if(!fp) exit(-1);
fp1 = fopen("output", "w");
if(!fp1) exit(-1);
int cont=0;
while (fgets(cad1, 1024, fp))
{
if(strstr((char *) cad1, "Address:"))
{
cad2 = strstr((char *) cad1, "Address:");
fprintf(fp1, "%s", cad2);
cont++;
}
else if(strstr((char *) cad1, " "))
{
cad2 = strstr((char *) cad1, " ");
fprintf(fp1, "%s", cad2);
}
}
pclose(fp);
fclose(fp1);
return cont;
}
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