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Full Discussion: awk output discrepancy
Top Forums Shell Programming and Scripting awk output discrepancy Post 302884521 by neutronscott on Monday 20th of January 2014 04:34:10 PM
Old 01-20-2014
I'd expect 7, since it's a string in that case. It seems it has to do with when it's converted between a string and int. I've several awk implementations installed locally, oawk is from heirloom tools which should be close to SunOS's.

Code:
$ try() { for awk in gawk mawk oawk bawk; do printf '%s: ' "$awk"; $awk "$@"; done; }
$ try 'BEGIN{ printf "%c\n", "78" }' /dev/null
gawk: 7
mawk: 7
oawk: N
bawk: 7

So what's oawk doing? Well, looks like it's using it as an int ALL THE TIME. I haven't the oawk code around anymore to dig any deeper. Perhaps it has its own printf? I've only known %c to be useful for casting an int to char. But in that first bit, it is internally made an int, unless we tack a null string to it then we're back to getting 7's.

Code:
for awk in gawk mawk oawk bawk; do printf '%s: ' "$awk"; echo 78 | $awk '{ printf "%c\n", $0 "" }'; done;
gawk: 7
mawk: 7
oawk: N
bawk: 7

This User Gave Thanks to neutronscott For This Post:
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LEARN ABOUT OPENSOLARIS

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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