printf on Nios2 not working properly

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originally posted by fmcmurra+mar 28 2006, 10:41 pm--><div class='quotetop'>quote (fmcmurra @ mar 28 2006, 10:41 pm)</div>

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<!--quotebegin-shakthi@Mar 28 2006, 03:12 AM

hi,

i am working on a custom board with nios2. i am facing a weird problem with printf.

when i do any printf i am getting an inversed output.

i.e. if i do printf("hello world"); i get ehll oowlrd. take 2 chars from h and reverse. u get the o/p i am getting.

all this is happening in vsprintf which is called by printf for formatting.

below i will give the code snippet where things are going wrong.

int vsprintf(char *buf, const char *fmt, va_list args)

{

...................

char * str;

...................

for (temp=str=buf ; *fmt ; ++fmt) {

if (*fmt != &#39;%&#39;) {

*str++ = *fmt;

continue;

}

.....................

case &#39;s&#39;:

s = va_arg(args, char *);

if (!s)

s = "<null>";

len = strnlen(s, precision);

if (!(flags & left))

while (len < field_width--)

*str++ = &#39; &#39;;

for (i = 0; i < len ; ++i)

*str++ = *s++;

while (len < field_width--)

*str++ = &#39; &#39;;

continue;

....................

}

for (i = 0; i < len ; ++i)

*str++ = *s++;

this is where every thing goes wrong.

suppose s="hello from niosii!" it coppies correctly to str but it appears as mentioned above in buf i.e "ehll oofmon oiisi.

clue:

for loop which is suppose to incerement from 0 to len, actually decrements from len to 0. i beleive it is compiler optimization.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=13861)

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Looks like it&#39;s byte swapped to me...

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=13873)</div>

[/b]

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<div class='quotetop'>QUOTE </div>

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Yappppp its a byte swap[/b]

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