[linux-dvb] [patch 1/3] fix gcc warnings

[Ludwig Nussel]

Johannes Stezenbach wrote:
> On Thu, Sep 29, 2005 Ludwig Nussel wrote:
> > Index: dvb-apps/lib/libdvben50221/asn_1.c
> > ===================================================================
> > --- dvb-apps.orig/lib/libdvben50221/asn_1.c
> > +++ dvb-apps/lib/libdvben50221/asn_1.c
> > @@ -61,7 +61,7 @@ uint8_t *asn_1_encode(uint16_t length, u
> >  
> >  		while (temp) {
> >  			temp = temp >> 8;
> > -			*asn_1_words++;
> > +			(*asn_1_words)++;
> >  		}
> >  		if ((asn_1_array = (uint8_t *) malloc(*asn_1_words * sizeof (uint8_t))) == NULL) {
> >  			printf("%s: Memory allocation failed.\n", __FUNCTION__);
> > @@ -70,7 +70,7 @@ uint8_t *asn_1_encode(uint16_t length, u
> >  		printf("%s: Allocated %d bytes.\n", __FUNCTION__, *asn_1_words);
> >  
> >  		while (length) {
> > -			asn_1_array[*asn_1_words--] = length & 0xff;
> > +			asn_1_array[(*asn_1_words)--] = length & 0xff;
> >  			length = length >> 8;
> >  		}
> >  		return asn_1_array;
> 
> This is not "fix gcc warnings". Have you tested it?
> (The first one looks like it fixes a bug, but without knowing what
> the code tries to do I can't tell.)
> Please split and send a seperate patch.

I did not test it but without the fix the code doesn't make any
sense. It would increment the _pointer_, dereference it and do
nothing with the result. It only makes sense if the content of
asn_1_words actually is a counter.

> 
> > Index: dvb-apps/lib/libdvben50221/en50221_encode.c
> > ===================================================================
> > --- dvb-apps.orig/lib/libdvben50221/en50221_encode.c
> > +++ dvb-apps/lib/libdvben50221/en50221_encode.c
> > @@ -46,7 +46,7 @@ uint16_t en50221_encode_header(struct ca
> >  uint16_t en50221_encode_descriptor(struct ca_msg * ca_msg,
> >  		                   struct ca_descriptor * desc, uint16_t pos)
> >  {
> > -	uint8_t i;
> > +	uint8_t i = 0;
> >  	uint16_t temp = 0, private_bytes = 0;
> >  	temp = pos;
> >  
> > Index: dvb-apps/libs/libdvb2/notifier.c
> > ===================================================================
> > --- dvb-apps.orig/libs/libdvb2/notifier.c
> > +++ dvb-apps/libs/libdvb2/notifier.c
> > @@ -86,15 +86,14 @@ int dvb_revents(struct dvb * dvb, const 
> >   */
> >  int dvb_revent(struct dvb * dvb, int fd, short revents)
> >  {
> > -	struct dvb_notifier * notifier;
> 
> keep this
> 
> >  	int i;
> >  
> >  	if (revents == 0)
> >  		return 0;
> >  
> >  	for (i = 0; i <= dvb->nb_notifiers; ++i) {
> > -		if (dvb->notifiers.ptrs[i] == NULL ||
> > -		    dvb->pollfds[i].fd != fd)
> > +		struct dvb_notifier * notifier = dvb->notifiers.ptrs[i];
> 
> 		notifier = dvb->notifiers.ptrs[i];
> 
> > +		if (notifier == NULL || dvb->pollfds[i].fd != fd)
> >  			continue;
> >  
> >  		dvb->pollfds[i].revents = revents;

It's not used outside of that loop. Same style as in dvb_revents.

> > Index: dvb-apps/util/scan/diseqc.c
> > ===================================================================
> > --- dvb-apps.orig/util/scan/diseqc.c
> > +++ dvb-apps/util/scan/diseqc.c
> > @@ -37,9 +37,6 @@ void msleep(uint32_t msec)
> >  		;
> >  }
> >  
> > -#define printf(x...)
> > -
> > -
> 
> What's that? Was it unused or do you enable debug prints?

The line is a nop. printf doesn't occur anywhere in that file. gcc
warns because with fortifying features enabled printf is a macro.

cu
Ludwig

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 (o_   Ludwig Nussel
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