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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LEARN ABOUT LINUX

vasprintf

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

NAME

       asprintf, vasprintf - print to allocated string

SYNOPSIS

       #define _GNU_SOURCE
       #include <stdio.h>

       int asprintf(char **strp, const char *fmt, ...);

       int vasprintf(char **strp, const char *fmt, va_list ap);

DESCRIPTION

       The functions asprintf() and vasprintf() are analogs of sprintf(3) and vsprintf(3), except that they allocate a string large enough to hold
       the output including the terminating null byte, and return a pointer to it via the first  argument.   This  pointer  should  be	passed	to
       free(3) to release the allocated storage when it is no longer needed.

RETURN VALUE

       When  successful,  these functions return the number of bytes printed, just like sprintf(3).  If memory allocation wasn't possible, or some
       other error occurs, these functions will return -1, and the contents of strp is undefined.

CONFORMING TO

       These functions are GNU extensions, not in C or POSIX.  They are also available under *BSD.  The FreeBSD implementation sets strp  to  NULL
       on error.

SEE ALSO

       free(3), malloc(3), printf(3), feature_test_macros(7)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2001-12-18							       ASPRINTF(3)

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