Reduce the number of strlen calls in the jansson backend.
Test on my laptop (count of the instructions)
Before:
❯ valgrind --tool=callgrind ./bin/test_object
==3105045== Events : Ir
==3105045== Collected : 441453
After:
❯ valgrind --tool=callgrind ./bin/test_object
==3144451== Events : Ir
==3144451== Collected : 440597
Signed-off-by: Maxim Zhukov <mussitantesmortem@gmail.com>
This commit added functions working with fixed-size strings (non null-terminated also).
It's helpful for the following cases:
* getting key from substring without copying to separate buffer (better perfomance)
* using pure UTF-8 keys for the objets
* hack: set binary structs as the keys (see test_binary_keys)
added functions:
* json_object_getn
* json_object_setn
* json_object_setn_nocheck
* json_object_setn_new
* json_object_setn_new_nocheck
* json_object_deln
* json_object_iter_key_len
added iterators:
* json_object_keylen_foreach
* json_object_keylen_foreach_safe
Signed-off-by: Maxim Zhukov <mussitantesmortem@gmail.com>
The --default-symver linker option attaches a default version definition
(the SONAME) to every exported symbol. It is supported since at least
GNU binutils 2.22 in 2011 (older versions not tested).
With this version definition, newly-linked binaries that depend on the
jansson shared library will refer to its symbols in a versioned form,
preventing their references from being resolved to a symbol of the same
name exported by json-c or json-glib if those libraries appear in
dependency search order before jansson, which will usually result in
a crash. This is necessary because ELF symbol resolution normally uses
a single flat namespace, not a tree like Windows symbol resolution.
At least one symbol (json_object_iter_next()) is exported by all three
JSON libraries.
Linking with -Bsymbolic is not enough to have this effect in all cases,
because -Bsymbolic only affects symbol lookup within a shared object,
for example when parse_json() calls json_decref(). It does not affect
calls from external code into jansson, unless jansson was statically
linked into the external caller.
This change will also not prevent code that depends on json-c or
json-glib from finding jansson's symbols and crashing; to prevent
that, a corresponding change in json-c or json-glib would be needed.
Adding a symbol-version is a backwards-compatible change, but once
added, removing or changing the symbol-version would be an incompatible
change that requires a SONAME bump.
Resolves: https://github.com/akheron/jansson/issues/523
(when combined with an equivalent change to json-c).
Signed-off-by: Simon McVittie <smcv@collabora.com>
The function vsnprintf returns a negative value on error, e.g. on
an invalid format. It's best to return NULL in such a case.
Also avoid a signed integer overflow if vsnprintf returns INT_MAX.
This is undefined behaviour in C and has to be avoided.
A negative value is returned with a call like:
json_sprintf("%111111111111111s", "", "");
INT_MAX is returned with a call like:
json_sprintf("%647s%2147483000s", "", "");
Support merging values nested within objects. For instance, merging:
{
"foo": 1,
"bar": {
"baz": 2
}
}
with
{
"bar": {
"baz": 3
}
}
results in
{
"foo": 1,
"bar": {
"baz": 3
}
}
instead of overwriting the value for the bar key.
This patch adds two new exported functions:
* `jansson_version_str` - Returns a human-readable version number
* `jansson_version_cmp` - Returns an integer less than, equal to, or greater
than zero if the runtime version of Jansson is found, respectively, to be
less than, to match, or be greater than the provided major, minor, and micro.
pack_string should never free str on error. This wouldn't be a problem
except the check for `ours` was inverted. Just remove the check for
ours since the true condition is unreachable.
json_vpack_ex also had an error check for s.has_error. This can never
be true unless value is NULL.
Expand pack_unpack testing to cover empty format string, NULL object
value with non-null concatenated key, array containing a non-null object
after a NULL (error) string.
Fixes#444
* Remove errant line-feed from pack_object error message.
* Correct error message in pack_object_inter.
* Create pack_integer / pack_real to get the correct error messages on
failure when packing numeric values.
* Add tests for packing NAN and infinity directly, in an array and as
an object value.
When NULL is received for an optional argument we should not set an
error message as this would block later error messages. If NULL is
received for a non-optional string we should set has_error. Set
has_error for UTF-8 errors to ensure optional strings with UTF-8
errors are not replaced with json_null(). Use 'purpose' argument in
NULL error messages of read_string.
Add error handling and tests for invalid formats where '+', '#', or '%'
is used on an optional string 's?' or 's*'.
Fix NULL string error messages to use 'purpose'.
Refactor skipping of '*' token, this is now handled by read_string and
pack_object_inter. This allows invalid format strings such as 's*#' and
's*+' to produce error messages.
Fixes#437
It was discovered fairly recently that JSON parsing libraries use
common pattern to name their exported symbols (they all use
json_ prefix). So eventually it happens that two symbols from two
different libraries have the same name. This will lead to cryptic
crashes (see [1] and [2]). Linking with -Bsymbolic-functions
prevents this.
1: https://gitlab.gnome.org/GNOME/json-glib/issues/33
2: https://groups.google.com/forum/#!topic/jansson-users/7Efx-RI45IU
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
As said in man doc:
"Each invocation of va_copy() must be matched by a corresponding
invocation of va_end() in the same function."
va_copy may alloc memory in some system, it's necessay to free it by
va_end.
Fixes: efe6c7b3f2 ("Add json_sprintf and json_vsprintf")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Recent versions of gcc have introduced compiler warnings for string
operations that could be truncated. This caused problems with -Werror.
src/error.c used strncpy to write "..." to a string, but skipped writing
the NUL terminator. Switch this to use memcpy. src/load.c produced
warnings from snprintf writing error strings that could be truncated.
Added code to autotools build to detect `-Wno-format-truncation', add it
to AM_CFLAGS if supported.
