RE: [avr-gcc-list] I am getting lost in indirections - help please

[Eric Weddington]

Avr-libc user manual, FAQ, #14:
<http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_rom_array> 


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Juergen Harms
> Sent: Thursday, March 15, 2007 11:56 AM
> To: address@hidden
> Subject: Re: [avr-gcc-list] I am getting lost in indirections 
> - help please
> 
> I want to fill the array "buffer" with the name of a weekday that (I 
> hope) is stored in an array in flash memory (in fact, I 
> intend to store 
> in flash both an array of pointers and the character strings they 
> pointers point to).
> 
> Here is what I have tried, and what does not work. I am a 
> newby to this 
> kind of indirection acrobacy, what have I figured out wrong ? (I use 
> strncpy_P rather than stcpy_P to avoid the garbage I get to do damage)
> 
> static const prog_char *day_names[] =
>       {       (const PROGMEM char *) "",
>               (const PROGMEM char *) "Mon",
>               (const PROGMEM char *) "Tue",
>               (const PROGMEM char *) "Wed",
>               (const PROGMEM char *) "Thu",
>               (const PROGMEM char *) "Fri",
>               (const PROGMEM char *) "Sat",
>               (const PROGMEM char *) "Sun"  } ;
> 
> 
> // Copy indexed string (name of Tue) to buffer, print it
> 
> void dummyprog () {
> 
>      uint16_t ptr ;
>      char     buffer[4] ;
> 
>      ptr = pgm_read_word_near ( (PGM_P) day_names[2] ) ;
>      strcpy_P ( buffer, (PGM_P) ptr ) ;
>      printf ( "@@@@ %s\n", buffer ) ;
> }
> 
> 
> 
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