Regarding EFBIG error while opening a file using catopen() function

Mon Dec 12 05:10:20 GMT 2022

Hi all,
I'm getting errno 27[EFBIG] file too large while opening catalogue with
catopen() function in the cygwin-32bit version.
Trying to open a .cat file but catopen() returns a file too large [EFBIG]
error.
this is the code snippet I was working with:
#define FILENAME TEMP.CAT
 buffer = catopen(FILENAME, 0);
 if (buffer != (nl_catd) - 1)
 {
 printf("File open successfully");
 }
 else
 {
 printf("errno: %d\n", errno);
 }
While debugging using gdb.I've found that st.st_size is 0 and As per my
understanding struct stat.st_size is declared as off_t, which is most
probably signed, and resolves to long (signed by default).
So if SIZE_T_MAX does not fit into 2^31-1 (it most probably does not) it
will appear as negative in the comparison.
I suspect like off_t is supposed to be signed, and size_t is supposed to be
unsigned, both according to POSIX.
That means, this comparison has definitely a signedness issue.
So that's why if condition getting success and returning errno 27(EFBIG).
Coding snippet where if condition getting succeed:
Msgcat.c:
=======
if (st.st_size > SIZE_T_MAX) {
 _close(fd);
 SAVEFAIL(name, lang, EFBIG);
 NLRETERR(EFBIG);
 }
I'd like to know the reason why I'm getting this error and How it can be
resolved as it is a blocker in my task.
Regards,
Kavita.