json-c implements a reference-counted object model for JSON, a parser that
builds it from text, and a serialiser that writes it back out. This archive
contains static libraries and public headers for Amiga development.
https://github.com/json-c/json-c
Contents
json-c/json-c.readme this file
json-c/AmigaOS3/... m68k AmigaOS libraries and headers
json-c/AmigaOS4/... ppc-amigaos libraries and headers
json-c/MorphOS/... ppc-morphos libraries and headers
Under each OS directory the trees follow the compiler's own layout, so
they can be copied straight over an existing SDK, e.g.
cp -a json-c/AmigaOS3/* /opt/amiga/m68k-amigaos/
AmigaOS3 ships one set per C runtime -- newlib at the top level, plus
libnix/ and clib2/ -- and within each, one library per multilib:
lib/ 68000, absolute addressing
lib/libm020/ 68020, absolute addressing
lib/libb/ 68000, -fbaserel
lib/libb/libm020/ 68020, -fbaserel
lib/libb32/libm020/ 68020, -fbaserel32
On PPC a C runtime is not a separate tree but a multilib slot beneath one
shared lib/, with headers in the single shared include/:
AmigaOS4 lib/ newlib
lib/clib2/ clib2
lib/clib4/ clib4
MorphOS lib/ ixemul
lib/libb32/ ixemul, -mbaserel32
lib/libnix/ native C library (-noixemul)
lib/libb32/libnix/ native C library, -mbaserel32
-mclib=libnix and -noixemul select the same MorphOS multilib. That ABI is
the self-contained one -- an ixemul build needs ixemul.library on the
target -- so prefer lib/libnix/ for new code.
Usage
#include <json-c/json.h>
struct json_object *o = json_tokener_parse("{\"a\":1}");
printf("%s\n", json_object_to_json_string(o));
json_object_put(o);
Link with -ljson-c -lm, after your own objects on the command line. For
clib2 add -lunix as well, since clib2 keeps its POSIX layer there.
Which variants link
Verified by compiling the snippet above against each shipped library.
AmigaOS3 libnix all 5 slots link.
clib2 lib/libm020/ and lib/libb32/libm020/ link. The other
three fail inside clib2 itself: its 68000 multilib has
no strtoll()/strtoull(), and 16-bit -fbaserel overflows
with "truncated to fit: DREL16" once json-c's data is
added. -fbaserel32 has no such limit.
newlib builds, but does not link: the m68k newlib tree has no
gettimeofday(). The libraries are shipped anyway, since
that is a gap in the SDK rather than in json-c and a
newlib with gettimeofday() implemented would link.
AmigaOS4 all three (newlib, clib2, clib4) link.
MorphOS all four slots link.
A note on base-relative addressing (AmigaOS3)
A base-relative library addresses its globals through a4, which the
program's startup code sets up once. Only link the libb/ or libb32/
variants into a program that is itself base-relative AND that marks every
function the OS calls back into (BOOPSI/MUI dispatchers, struct Hook
entries, interrupt servers) with __saveds. The m68k SDI_hook.h macros set
up register arguments but do not add __saveds, so this is easy to get
wrong, and the failure mode is intermittent memory corruption rather than
a clean error -- libnix keeps malloc's heap state in a4-relative storage.
Conversely a non-base-relative library built at -O1 or above may use a4 as
a scratch register, which is harmless in a non-base-relative program but
corrupts the base pointer of one that is.
Match the variant to the program. If in doubt, use the plain lib/ or
lib/libm020/ builds.
Licence
MIT; see COPYING in the source distribution.
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