08-08-2007
questions in memset
HI all ,
please find the piece of code below
char *t[100];
char *f[100];
char buf[60];
memset(buf,0,50);
after that i am assigning memory
for (i=0; i<100; i++)
{
t[i] = buf+(i*6);
f[i] = "ARUN";
}
my question ..
1) i have run this it is working in one system and not working other system
my doubt is t[i] we are allcation is having 600 bytes memory bu the loop increaments and it calculates as buf+i*6
will this result to segmentation fault(core dump) .. Why it is runningin one system and same exe is making core dump in other
the core dump occurs when i tried to loop through t array
2) I have set 50 byte to 0 by memset when i print by the buf by gdb i am getting only 10 bytes assigned to null not all why ??.. please let me know..
3) Even though i am having only 60 sapces in buf array how the t array points to 600 location ?.. Is it possible..
Thanks,
Arun
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LEARN ABOUT REDHAT
err_reason_error_string
ERR_error_string(3) OpenSSL ERR_error_string(3)
NAME
ERR_error_string, ERR_error_string_n, ERR_lib_error_string, ERR_func_error_string, ERR_reason_error_string - obtain human-readable error
message
SYNOPSIS
#include <openssl/err.h>
char *ERR_error_string(unsigned long e, char *buf);
char *ERR_error_string_n(unsigned long e, char *buf, size_t len);
const char *ERR_lib_error_string(unsigned long e);
const char *ERR_func_error_string(unsigned long e);
const char *ERR_reason_error_string(unsigned long e);
DESCRIPTION
ERR_error_string() generates a human-readable string representing the error code e, and places it at buf. buf must be at least 120 bytes
long. If buf is NULL, the error string is placed in a static buffer. ERR_error_string_n() is a variant of ERR_error_string() that writes
at most len characters (including the terminating 0) and truncates the string if necessary. For ERR_error_string_n(), buf may not be NULL.
The string will have the following format:
error:[error code]:[library name]:[function name]:[reason string]
error code is an 8 digit hexadecimal number, library name, function name and reason string are ASCII text.
ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the library name, function name and reason string
respectively.
The OpenSSL error strings should be loaded by calling ERR_load_crypto_strings(3) or, for SSL applications, SSL_load_error_strings(3) first.
If there is no text string registered for the given error code, the error string will contain the numeric code.
ERR_print_errors(3) can be used to print all error codes currently in the queue.
RETURN VALUES
ERR_error_string() returns a pointer to a static buffer containing the string if buf == NULL, buf otherwise.
ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the strings, and NULL if none is registered for the
error code.
SEE ALSO
err(3), ERR_get_error(3), ERR_load_crypto_strings(3), SSL_load_error_strings(3) ERR_print_errors(3)
HISTORY
ERR_error_string() is available in all versions of SSLeay and OpenSSL. ERR_error_string_n() was added in OpenSSL 0.9.6.
0.9.7a 2000-09-14 ERR_error_string(3)