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Top Forums Programming warning: integer overflow in expression Post 302123485 by tantric on Monday 25th of June 2007 11:10:33 PM
Old 06-26-2007
warning: integer overflow in expression

I have the following expression:

Code:
#define GB                      (1024 * 1024 * 1024)
#define TB                      (1024 * GB)
#define MAX_SIZE                (3 * TB)

off_t                            current_size;

And then the expression...

Code:
if (current_size > MAX_SIZE) 
{
   //do something
}

I have used large file support in my program. Compiled using -D_FILE_OFFSET_BITS=64 flag.

So, with large file support, off_t grows from 32 to 64 bits.

But how do I compare something which is off_t with a 64 bit number ?? How do I use a 64 bit number in an expression ??

#define MAX_SIZE (3ul * TB) will also fail because ul is still 32 bits.

please help me.. I am looking for a portable solution.. thanks Smilie))
 

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vdltodmx(1)						      General Commands Manual						       vdltodmx(1)

NAME
vdltodmx - dmx configuration file parser and printer SYNOPSIS
vdltodmx infile outfile DESCRIPTION
vdltodmx reads the input file, which should be in VDL configuration file format. After a successful parse, a file in Xdmx configuration file format is written to the output file. The VDL file format is used with xmovie, which is available from http://www.llnl.gov/icc/lc/img/xmovie/xmovie.html EXAMPLE
Given the following VDL-format file: 0 2 # # 2560 2048 Left two-thirds [restrict=*:2] 2 :2.1 1280 2048 0 0 0 0 :2.2 1280 2048 1280 0 0 0 4 1280 1024 0 0 1280 1024 0 1024 1280 1024 1280 0 1280 1024 1280 1024 # 2560 2048 Right two-thirds [restrict=*:2] 2 :2.2 1280 2048 0 0 0 0 :2.3 1280 2048 1280 0 0 0 4 1280 1024 1280 0 1280 1024 1280 1024 1280 1024 2560 0 1280 1024 2560 1024 the following DMX-format file will be produced: # # virtual "Left two-thirds" 2560x2048 { display :2.1 1280x2048; display :2.2 1280x2048 @1280x0; } # virtual "Right two-thirds" 2560x2048 { display :2.2 1280x2048; display :2.3 1280x2048 @1280x0; } BUGS
If the VDL file is not in the expected format, the program will probably dump core. SEE ALSO
Xdmx(1), xdmxconfig(1), vdl(3), xmovie(1) X Version 11 xorg-server 1.12.4 vdltodmx(1)
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