03-21-2006
string returning function
I have two string returning function in ESQL/C
char *segment_name(lbuffer)
char *lbuffer;
{.....
and
char *get_bpdvalue(f_name)
char *f_name;
{......
both declared above main()
char *get_bpdvalue();
char *segment_name();
my problem is segment_name works on sprintf and strcpy while get_bpdvalue only works on strcpy and not sprintf
. someone told me that sprintf using string returning function usually has that bug.
ok, i can use strcpy first before i using sprintf but that would make my code longer. and i cant just accept the fact that ESQL/C has that kind of bug
. i hope someone can point me here in the right direction
, is there something i can do abou the function or its declaration to make it work in sprintf? thanks a lot...
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LEARN ABOUT REDHAT
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)