[rrd-developers] Re: Argv changing

[Burton Strauss]

That's a basic side effect of the standard gnu opt/opt long handling
routines.  Check their man pages.  These routines are given a list of
command letters/commands and it sorts those it recognizes to the top,
followed by unrecognized ones and then positional parameters.

If you need to preserve the values, give the rrd routines (or ANY called
program for that matter) a copy.

-----Burton 

-----Original Message-----
From: rrd-developers-bounce at list.ee.ethz.ch
[mailto:rrd-developers-bounce at list.ee.ethz.ch] On Behalf Of Antoine Guilmard
Sent: Wednesday, October 19, 2005 3:47 AM
To: rrd-developers at list.ee.ethz.ch
Subject: [rrd-developers] Argv changing

Hi,

After a rrd_graph() call with my argc[] argv[], i get my argv changing ? the
filename is not at the same position in my argv[]

For example dump of my argv list before call :

0 : d:\Mes Documents\Projets Visual Studio\SnmpGraph\src\Debug\SnmpGraph.exe
1 : graph
2 : d:\Server\www\apache\stats\adsl.png
3 : --start
4 : e-12h
5 : --imgformat
6 : PNG
7 : --title
8 : date Wed Oct 19 10:16:22 2005
9 : --font
10 : TITLE:16:Textapoint.ttf
11 : --font
12 : LEGEND:8:comic.ttf
13 : --font
14 : UNIT:9:comic.ttf
15 : --font
16 : AXIS:8:comic.ttf
17 : -h
18 : 150
19 : -w
20 : 700
21 : --rigid
22 : --upper-limit
23 : 130000
24 : --vertical-label
25 : DÚbit (Ko/s)
26 : DEF:Line1=DataBase1.rrd:adsldl:AVERAGE
27 : DEF:Line2=DataBase1.rrd:adslup:AVERAGE
28 : CDEF:flaming1=Line1,40,*,100,/
29 : AREA:flaming1#ffff5f: Download\t
30 : CDEF:flaming2=Line1,5,*,100,/
31 : STACK:flaming2#fff257
32 : STACK:flaming2#ffe54f
33 : STACK:flaming2#ffd947
34 : STACK:flaming2#ffcc3f
35 : STACK:flaming2#ffbf37
36 : STACK:flaming2#ffb230
37 : STACK:flaming2#ffa628
38 : STACK:flaming2#ff9920
39 : STACK:flaming2#ff8c18
40 : STACK:flaming2#ff8010
41 : STACK:flaming2#ff7308
42 : STACK:flaming2#ff6600
43 : COMMENT:
44 : GPRINT:Line1:MAX:\tmax\: %6.2lf %so/s
45 : GPRINT:Line1:AVERAGE:\tmoy\: %6.2lf %so/s
46 : GPRINT:Line1:LAST:\tactuelle\: %6.2lf %so/s
47 : COMMENT:\n
48 : LINE2:Line2#0000FF: Upload\t
49 : COMMENT:
50 : GPRINT:Line2:MAX:\tmax\: %6.2lf %so/s
51 : GPRINT:Line2:AVERAGE:\tmoy\: %6.2lf %so/s
52 : GPRINT:Line2:LAST:\tactuelle\: %6.2lf %so/s

after call rrd_graph():

0 : d:\Mes Documents\Projets Visual Studio\SnmpGraph\src\Debug\SnmpGraph.exe
1 : graph
2 : --start
3 : e-12h
4 : --imgformat
5 : PNG
6 : --title
7 : date Wed Oct 19 10:16:22 2005
8 : --font
9 : TITLE:16:Textapoint.ttf
10 : --font
11 : LEGEND:8:comic.ttf
12 : --font
13 : UNIT:9:comic.ttf
14 : --font
15 : AXIS:8:comic.ttf
16 : -h
17 : 150
18 : -w
19 : 700
20 : --rigid
21 : --upper-limit
22 : 130000
23 : --vertical-label
24 : DÚbit (Ko/s)
25 : d:\Server\www\apache\stats\adsl.png
26 : DEF:Line1=DataBase1.rrd:adsldl:AVERAGE
27 : DEF:Line2=DataBase1.rrd:adslup:AVERAGE
28 : CDEF:flaming1=Line1,40,*,100,/
29 : AREA:flaming1#ffff5f: Download\t
30 : CDEF:flaming2=Line1,5,*,100,/
31 : STACK:flaming2#fff257
32 : STACK:flaming2#ffe54f
33 : STACK:flaming2#ffd947
34 : STACK:flaming2#ffcc3f
35 : STACK:flaming2#ffbf37
36 : STACK:flaming2#ffb230
37 : STACK:flaming2#ffa628
38 : STACK:flaming2#ff9920
39 : STACK:flaming2#ff8c18
40 : STACK:flaming2#ff8010
41 : STACK:flaming2#ff7308
42 : STACK:flaming2#ff6600
43 : COMMENT:
44 : GPRINT:Line1:MAX:\tmax\: %6.2lf %so/s
45 : GPRINT:Line1:AVERAGE:\tmoy\: %6.2lf %so/s
46 : GPRINT:Line1:LAST:\tactuelle\: %6.2lf %so/s
47 : COMMENT:\n
48 : LINE2:Line2#0000FF: Upload\t
49 : COMMENT:
50 : GPRINT:Line2:MAX:\tmax\: %6.2lf %so/s
51 : GPRINT:Line2:AVERAGE:\tmoy\: %6.2lf %so/s
52 : GPRINT:Line2:LAST:\tactuelle\: %6.2lf %so/s

Here the filename of my graph is now at index 25, before it was at index 2.
A part of argv are shifted.
Is it a bug ? or not, because in rrdtool.c there is a line :
#ifdef notused  /*XXX*/
    const char *imgfile = argv[2]; /* rrd_graph changes argv pointer */
#endif


Thx,
Antoine Guilmard.

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