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Full Discussion: Question on order of headers and WEXITSTATUS
Top Forums Programming Question on order of headers and WEXITSTATUS Post 302120335 by frequency8 on Tuesday 5th of June 2007 09:07:22 PM
Old 06-05-2007
Quote:
Originally Posted by jim mcnamara
Q2 - POSIX says:


The lower eight bits of something is never 256 -- 8 bits range from 0 - 255. First. Did you check WIFEXITED?

the >> question: I do not know, but I do know function arguments are sequence points. That means they have to be fully evaluated before they are passed as argument to a function.

Are you using an old compiler, like the one that comes as part of HPUX?

Q1- sys/types.h is required to be included first by wait(), followed by sys/wait.h - if you read the man page for wait.

The real reason is so that test macros in the other include files do not "accidentally" turn off a declaration of some datatype, struct or typedef needed by somebody in another include file later on.

I'm using the GNU C Compiler. I'm suspecting it might have to do with that fact that the '>> isn't a sequence point.
 

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LEARN ABOUT REDHAT

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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