[sdcc-devel] [ sdcc-Bugs-1774346 ] sprintf fails to read some format specifiers

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Bugs item #1774346, was opened at 2007-08-14 21:43
Message generated for change (Comment added) made by tecodev
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Category: pic16 target
>Group: known bugs
>Status: Pending
>Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: Tom (motratiug)
Assigned to: Nobody/Anonymous (nobody)
Summary: sprintf fails to read some format specifiers

Initial Comment:
sprintf does not appear to correctly implement format specifiers including width characters:

sprintf(cBuffer, "%03d", 4);

produces 0x30 0x33 0x00 rather than the expected 0x30 0x30 0x34.



Compiled using:
sdcc -mpic16 -p18f2320 7seg-sp.c

sdcc version:
SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.7.0 #4818 (May 31 2007) (MINGW32)

using gputils:
gpasm-0.13.4 beta
gplink-0.13.4 alpha


Apologies for the size of the attached code, however I wanted to make sure I didn't drop anything important by editing it for this report.

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>Comment By: Raphael Neider (tecodev)
Date: 2007-08-23 09:33

Message:
Logged In: YES 
user_id=1115835
Originator: NO

The pic16 library sources indicate that the supported format specifiers
(for vfprintf, which is used to implement the whole *printf-family)
comprise
%%, %[u]hb, %[u]b, %[u]lb, %[u]hd, %[u]d, %[u]ld, %[u]hx, %[u]hX, %[u]x,
%[u]X, %[u]lx, %[u]lX, %[u]ho, %[u]o, %[u]lo, %c, and %s,
where `u' is an optional modifier indicating unsigned values, `h' denotes
byte wide arguments (8 bit), `l' long arguments (32 bit) and no modifier
standard int (16 bit) arguments, which are emitted as (b)inary, (d)ecimal,
he(x)adecimal in lower- or uppoercase letters, or (o)ctal besides the
literal (%) sign output, a single ASCII (c)haracter or a NUL terminated
(s)tring.
Width and padding modifiers are nit supported by the PIC16 library
version---feel free to use a different implementation, just link it prior
to the library to your project.

If I should happen to come up with a compact fully fledged, SUSv3 and
POSIX compatible printf implementation, I will add it to the library... or
sell it for muuuch money ;-)

Regards,
Raphael

Not sure how to proceed: is this a feature request? really a bug, despite
being documented in the sources?!? Setting this to pending...


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