date and time arithmatic

[upadhyad]

Hi all!!
i am relatively new to c... and I need to help urgently!
i have date and time in 2 separate strings. i have parsed them. eg
I had 26.2.2007 and I parsed it so that i have day month and year in different integer varaibles i.e. a=26; b=2;c=2007;
Similarly I have the time also parsed and hour minute and seconds stored in different integer variables.
Now I have to store them in the struct tm or any other time format so that i can use difftime function of the time.h

a
*** stack smashing detected ***: ./a.out terminated
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(__for tify_fail+0x48)[0xb7f52138]
/lib/tls/i686/cmov/libc.so.6(__for tify_fail+0x0)[0xb7f520f0]
./a.out[0x80485b9]
[0x7d7]
======= Memory map: ========
08048000-08049000 r-xp 00000000 08:01 1400873 /home/upadhyad/Desktop/C testing/date time/a.out
08049000-0804a000 rw-p 00000000 08:01 1400873 /home/upadhyad/Desktop/C testing/date time/a.out
0804a000-0806b000 rw-p 0804a000 00:00 0 [heap]
b7e64000-b7e65000 rw-p b7e64000 00:00 0
b7e65000-b7fae000 r-xp 00000000 08:01 17088 /lib/tls/i686/cmov/libc-2.7.so
b7fae000-b7faf000 r--p 00149000 08:01 17088 /lib/tls/i686/cmov/libc-2.7.so
b7faf000-b7fb1000 rw-p 0014a000 08:01 17088 /lib/tls/i686/cmov/libc-2.7.so
b7fb1000-b7fb4000 rw-p b7fb1000 00:00 0
b7fb5000-b7fbf000 r-xp 00000000 08:01 4661312 /lib/libgcc_s.so.1
b7fbf000-b7fc0000 rw-p 0000a000 08:01 4661312 /lib/libgcc_s.so.1
b7fc0000-b7fc3000 rw-p b7fc0000 00:00 0
b7fc3000-b7fc4000 r-xp b7fc3000 00:00 0 [vdso]
b7fc4000-b7fde000 r-xp 00000000 08:01 4661267 /lib/ld-2.7.so
b7fde000-b7fe0000 rw-p 00019000 08:01 4661267 /lib/ld-2.7.so
bfc69000-bfc7e000 rw-p bffeb000 00:00 0 [stack]
Aborted

[upadhyad]

PLz someone help...it is urgent

[weaknessforcats]

struct tm *haha;
etc............ ........

haha->tm_sec=c;
haha->tm_min=b;
haha->tm_hour=a;
haha->tm_mday=x;
haha->tm_mon=y;
haha->tm_year=z;

All you have is a pointer to a struct tm but you a) have no struct tm itself and b) even if you did this pointer has not been initialized.

Either:
[code=cpp]
struct tm haha;
haha.tm_sec=c;
etc...
[/code]

or
[code=cpp]
struct tm theTime;
struct tm* haha = &theTime; //define and initialize pointer
haha->tm_sec=c;
etc...
[/code]

[upadhyad]

Thanks a lot for replying!!
I rectified the program. now I have made it to get the difference of the different times :
[code=c]
struct tm theTime1, theTime2;
struct tm *pointer1=&theT ime1; //first pointer
struct tm *pointer2=&theT ime2; //second pointer

char date1[]="26.2.2007" ; //first date and time
char time1[]="13:34:45";

char date2[]="26.2.2007" ; //second date and time
char time2[]="13:34:49";

char *ptr1, *ptr11;
int x1,y1,z1,a1,b1, c1;

char *ptr2, *ptr22;
int x2,y2,z2,a2,b2, c2;

ptr1=(char *)strtok(date1, "."); //first date parse
x1=atoi(ptr1);
ptr1=(char *)strtok(NULL," .");
y1=atoi(ptr1);
ptr1=(char *)strtok(NULL," .");
z1=atoi(ptr1);

ptr11=(char *)strtok(time1, ":"); //first time parse
a1=atoi(ptr11);
ptr11=(char *)strtok(NULL," :");
b1=atoi(ptr11);
ptr11=(char *)strtok(NULL," :");
c1=atoi(ptr11);

ptr2=(char *)strtok(date2, "."); //second date parse
x2=atoi(ptr2);
ptr2=(char *)strtok(NULL," .");
y2=atoi(ptr2);
ptr2=(char *)strtok(NULL," .");
z2=atoi(ptr2);

ptr22=(char *)strtok(time2, ":"); //second time parse
a2=atoi(ptr22);
ptr22=(char *)strtok(NULL," :");
b2=atoi(ptr22);
ptr22=(char *)strtok(NULL," :");
c2=atoi(ptr22);

pointer1->tm_sec=c1; //assigning values to the components of the calendar time 1
pointer1->tm_min=b1;
pointer1->tm_hour=a1;
pointer1->tm_mday=x1;
pointer1->tm_mon=y1;
pointer1->tm_year=z1;

pointer2->tm_sec=c2; //assigning values to the components of the calendar time 2
pointer2->tm_min=b2;
pointer2->tm_hour=a2;
pointer2->tm_mday=x2;
pointer2->tm_mon=y2;
pointer2->tm_year=z2;

time_t t1= mktime(pointer1 ); //converting time 1 to the calendar time

time_t t2= mktime(pointer2 ); //converting time 2 to the calendar time
[/code]
---------------------------the output-------------------------
0
-1
-1
--------------------------------

please help!

[gpraghuram]

First tell me how are you or where u are getting the date and time?
Also explain what is ur requirement.

Raghu

[upadhyad]

hi gpraghuram!

I have read these date and time values form a text file.
the text file has stages listed in each newline and each stage has a starting date and time and one ending date and time. I have read the dates and times as string form the file. First I wanted to be sure of the date and time operations therefore I wrote the above program. there is no aditional information given. I have tosubtract the starting time and the ending time.

[gpraghuram]

I think then you should make use of this function strptime

Raghuram.

[upadhyad]

Hi thanks a lot
that command was not listed in the book i m using
I have a new problem now.
I have defined a new structure:
=============== ===

struct IDnTime
{
char previousEdate[50];
struct tm theTime;
struct tm *ptr;
time_t t;
} IDnTimeArray[5];
=============== ===LIKE THIS===
but when I call

=============== =======
strcpy(IDnTimeA rray[2].previousEdate, "26.02.2007 ");
strptime(IDnTim eArray[2].previousEdate, "%d.%m.%Y", IDnTimeArray[counter].ptr);
=============== ==========

I get a segmentation fault

I dont understand why??

[upadhyad]

Hi all !!
my previous problem is also solved
I had not assigned the pointer in the structure to any value.....now i have rectified the mistake
thanks a lot everyone for helping me
this website rocks!!!!