string returning function Post: 302069206

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Top Forums Programming string returning function Post 302069206 by velociraptor on Thursday 23rd of March 2006 09:35:36 AM

03-23-2006

Registered User

We need more complete code to help you

Hi Jisc,

You really haven't supplied us enough code to be able to help you.

>>segment_name works on sprintf and strcpy while get_bpdvalue only works on strcpy and not sprintf

If there is really a bug in the compiler sprintf implementation regarding %s, then I would expect it to always fail. Not work one time and then fail another. That is not gauranteed, but the odds are high. Also, if the compiler version has been out there a while, something as common as that would have to have been seen and widely reported.

What about if you loop it 50 times, does that same behavior hold up, or does it start failing for both, or intermittently for either?

If gen_awb is really a char array (NOT a char* - error) AND it is large enough so that no memory overwrite occurrs, then most likely the problem is originating in your char *get_bpdvalue() function.

Keep in mind also, IMPORTANT, that memory overwrites elsewhere in your code could be showing up here as a symption, even though the actual problem may not be right here. That is value of the looping test above, see if other problems appear or if the one problem stays consistent.

So anyway, what is the complete body of your char *get_bpdvalue() function?

Where is the code showing the allocation of char gen_awb[100]; and what all you are doing with it?

Show us all the code necessary to help you.

-mc

velociraptor

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strncpy

STRCPY(3)						     Linux Programmer's Manual							 STRCPY(3)

NAME

       strcpy, strncpy - copy a string

SYNOPSIS

       #include <string.h>

       char *strcpy(char *dest, const char *src);

       char *strncpy(char *dest, const char *src, size_t n);

DESCRIPTION

       The  strcpy() function copies the string pointed to by src (including the terminating `' character) to the array pointed to by dest.  The
       strings may not overlap, and the destination string dest must be large enough to receive the copy.

       The strncpy() function is similar, except that not more than n bytes of src are copied. Thus, if there is no null byte among  the  first  n
       bytes of src, the result will not be null-terminated.

       In the case where the length of src is less than that of n, the remainder of dest will be padded with nulls.

RETURN VALUE

       The strcpy() and strncpy() functions return a pointer to the destination string dest.

BUGS

       If  the	destination  string  of  a  strcpy() is not large enough (that is, if the programmer was stupid/lazy, and failed to check the size
       before copying) then anything might happen.  Overflowing fixed length strings is a favourite cracker technique.

CONFORMING TO

       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO

       bcopy(3), memccpy(3), memcpy(3), memmove(3)

GNU
								    1993-04-11								 STRCPY(3)

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