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String too long to view in GDB

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# 1  
Old 10-28-2009
String too long to view in GDB
Hi All
Sometimes when I debug my C++ code with GDB an I want to view the content of my string variables I use the command "p <name of variable>" .

When strings are very long and their displayed content is truncated.

Do you know a way to see the whole content of those?
Thanks
M
# 2  
Old 10-28-2009
Code:
set print elements 0

Setting it to 200 tells it to max out at 200 characters. Setting it to zero means to have no limit.
# 3  
Old 10-28-2009
You can print the contents of the memory location if you know the address of that string...
Code:
(gdb) x/s <address>

# 4  
Old 10-28-2009
Thank you all!
I really appreciate!
Mn
# 5  
Old 11-02-2009
Code:
Breakpoint 1, main () at gdb.c:3
3               char *str ="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
(gdb) s
5       printf("%d",strlen(str));
(gdb) s
6       return 0;
(gdb) p str
$1 = 0x8048460 'a' <repeats 200 times>...
(gdb) set print elements 0
(gdb) p str
$2 = 0x8048460 'a' <repeats 824 times>
(gdb)

this is want i tried but its not displaying contents only displaying the number
200 or 824.

can't i see the contents of locations

thanks in advance.

---------- Post updated at 01:01 AM ---------- Previous update was at 12:54 AM ----------



Code:
char *str ="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";
(gdb) s
5       printf("%d",strlen(str));
(gdb) s
6       return 0;
(gdb) p str
$1 = 0x8048460 "aaaaaaaab", 'a' <repeats 14 times>, "baaaaaaaaaadaaaaaaaaaasaaafaagaaaadaaaajaaakaaataaaeaaajjaakaalaaiaaaaabadasaaaqaaavaanaakalapamanabavafatayahajavadasaeaazaxacamanabavaahajakalapaoaatareadsaaadaff", 'a' <repeats 13 times>...

i changed the string randomly but out put is not is not undestandable.
# 6  
Old 11-02-2009
Before Corona688 showed you how to print unlimited array elements by setting "set print elements 0" gdb will print out only the first 200 elements which is the output you get here...
Code:
(gdb) p str
$1 = 0x8048460 'a' <repeats 200 times>...

After implementing his advice gdb shows the contents of the entire array str on this line...
Code:
(gdb) set print elements 0
(gdb) p str
$2 = 0x8048460 'a' <repeats 824 times>

What is so cryptic about the above...it tells you that 'a' repeats 824 times which is the length of str excluding the last null. If you want to see each element of the array str then you should not have any duplicates in it. and you can see the memory taken up by str by printing out its address...
Code:
(gdb) p &str

Quote:
Originally Posted by MrUser
this is want i tried but its not displaying contents only displaying the number
200 or 824.

can't i see the contents of locations
You are looking at the contents of the memory location without realizing it.
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