C function "strtoull" failing Post: 302858887

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Top Forums Programming C function "strtoull" failing Post 302858887 by alister on Tuesday 1st of October 2013 03:19:52 PM

10-01-2013

Registered User

If you had posted a complete yet minimal, compilable program which reproduces the issue, it is likely that this thread would have been resolved long ago.

Regards,
Alister

---------- Post updated at 03:19 PM ---------- Previous update was at 02:54 PM ----------

jim_mcnamara and don_cragun in posts #2 and #4, respectively, correctly deduced from the nature of the numbers involved that a long long was left-truncated into an integer. However, their responses were handicapped by not having access to a complete program.

Had your original post been more forthcoming, either of them would have seen immediately that the truncation was not caused by a printf bug but by incomplete headers.

You need to include the correct headers so that the compiler doesn't default to implicit function prototypes which treat arguments and return values as integers.

What you are seeing is the result of strtoull's return value taken as an integer before assignment to intValue (as if there were a cast operation there). There are surely other bugs just waiting to bite.

Consult the manual pages of each library function to learn which headers must be included.
Also, you should enable compiler warnings; they would have pointed this out to you.

Regards,
Alister

Last edited by alister; 10-01-2013 at 04:25 PM..

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head

HEAD(1) 								FSF								   HEAD(1)

NAME

       head - output the first part of files

SYNOPSIS

       head [OPTION]... [FILE]...

DESCRIPTION

       Print  first  10 lines of each FILE to standard output.	With more than one FILE, precede each with a header giving the file name.  With no
       FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --bytes=SIZE
	      print first SIZE bytes

       -n, --lines=NUMBER
	      print first NUMBER lines instead of first 10

       -q, --quiet, --silent
	      never print headers giving file names

       -v, --verbose
	      always print headers giving file names

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for head is maintained as a Texinfo manual.  If the info and head programs are properly installed at your site, the
       command

	      info head

       should give you access to the complete manual.

head (coreutils) 4.5.3						   February 2003							   HEAD(1)