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Systemd/src/shared/json.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <locale.h>
#include <math.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "sd-messages.h"
#include "alloc-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "float.h"
#include "hexdecoct.h"
#include "json-internal.h"
#include "json.h"
#include "macro.h"
#include "memory-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "utf8.h"
/* Refuse putting together variants with a larger depth than 4K by default (as a protection against overflowing stacks
* if code processes JSON objects recursively. Note that we store the depth in an uint16_t, hence make sure this
* remains under 2^16.
* The value was 16k, but it was discovered to be too high on llvm/x86-64. See also the issue #10738. */
#define DEPTH_MAX (4U*1024U)
assert_cc(DEPTH_MAX <= UINT16_MAX);
typedef struct JsonSource {
/* When we parse from a file or similar, encodes the filename, to indicate the source of a json variant */
size_t n_ref;
unsigned max_line;
unsigned max_column;
char name[];
} JsonSource;
/* On x86-64 this whole structure should have a size of 6 * 64 bit = 48 bytes */
struct JsonVariant {
union {
/* We either maintain a reference counter for this variant itself, or we are embedded into an
* array/object, in which case only that surrounding object is ref-counted. (If 'embedded' is false,
* see below.) */
size_t n_ref;
/* If this JsonVariant is part of an array/object, then this field points to the surrounding
* JSON_VARIANT_ARRAY/JSON_VARIANT_OBJECT object. (If 'embedded' is true, see below.) */
JsonVariant *parent;
};
/* If this was parsed from some file or buffer, this stores where from, as well as the source line/column */
JsonSource *source;
unsigned line, column;
JsonVariantType type:5;
/* A marker whether this variant is embedded into in array/object or not. If true, the 'parent' pointer above
* is valid. If false, the 'n_ref' field above is valid instead. */
bool is_embedded:1;
/* In some conditions (for example, if this object is part of an array of strings or objects), we don't store
* any data inline, but instead simply reference an external object and act as surrogate of it. In that case
* this bool is set, and the external object is referenced through the .reference field below. */
bool is_reference:1;
/* While comparing two arrays, we use this for marking what we already have seen */
bool is_marked:1;
/* The current 'depth' of the JsonVariant, i.e. how many levels of member variants this has */
uint16_t depth;
union {
/* For simple types we store the value in-line. */
JsonValue value;
/* For objects and arrays we store the number of elements immediately following */
size_t n_elements;
/* If is_reference as indicated above is set, this is where the reference object is actually stored. */
JsonVariant *reference;
/* Strings are placed immediately after the structure. Note that when this is a JsonVariant embedded
* into an array we might encode strings up to INLINE_STRING_LENGTH characters directly inside the
* element, while longer strings are stored as references. When this object is not embedded into an
* array, but stand-alone we allocate the right size for the whole structure, i.e. the array might be
* much larger than INLINE_STRING_LENGTH.
*
* Note that because we want to allocate arrays of the JsonVariant structure we specify [0] here,
* rather than the prettier []. If we wouldn't, then this char array would have undefined size, and so
* would the union and then the struct this is included in. And of structures with undefined size we
* can't allocate arrays (at least not easily). */
char string[0];
};
};
/* Inside string arrays we have a series of JasonVariant structures one after the other. In this case, strings longer
* than INLINE_STRING_MAX are stored as references, and all shorter ones inline. (This means — on x86-64 — strings up
* to 15 chars are stored within the array elements, and all others in separate allocations) */
#define INLINE_STRING_MAX (sizeof(JsonVariant) - offsetof(JsonVariant, string) - 1U)
/* Let's make sure this structure isn't increased in size accidentally. This check is only for our most relevant arch
* (x86-64). */
#ifdef __x86_64__
assert_cc(sizeof(JsonVariant) == 48U);
assert_cc(INLINE_STRING_MAX == 15U);
#endif
static JsonSource* json_source_new(const char *name) {
JsonSource *s;
assert(name);
s = malloc(offsetof(JsonSource, name) + strlen(name) + 1);
if (!s)
return NULL;
*s = (JsonSource) {
.n_ref = 1,
};
strcpy(s->name, name);
return s;
}
DEFINE_PRIVATE_TRIVIAL_REF_UNREF_FUNC(JsonSource, json_source, mfree);
static bool json_source_equal(JsonSource *a, JsonSource *b) {
if (a == b)
return true;
if (!a || !b)
return false;
return streq(a->name, b->name);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(JsonSource*, json_source_unref);
/* There are four kind of JsonVariant* pointers:
*
* 1. NULL
* 2. A 'regular' one, i.e. pointing to malloc() memory
* 3. A 'magic' one, i.e. one of the special JSON_VARIANT_MAGIC_XYZ values, that encode a few very basic values directly in the pointer.
* 4. A 'const string' one, i.e. a pointer to a const string.
*
* The four kinds of pointers can be discerned like this:
*
* Detecting #1 is easy, just compare with NULL. Detecting #3 is similarly easy: all magic pointers are below
* _JSON_VARIANT_MAGIC_MAX (which is pretty low, within the first memory page, which is special on Linux and other
* OSes, as it is a faulting page). In order to discern #2 and #4 we check the lowest bit. If it's off it's #2,
* otherwise #4. This makes use of the fact that malloc() will return "maximum aligned" memory, which definitely
* means the pointer is even. This means we can use the uneven pointers to reference static strings, as long as we
* make sure that all static strings used like this are aligned to 2 (or higher), and that we mask the bit on
* access. The JSON_VARIANT_STRING_CONST() macro encodes strings as JsonVariant* pointers, with the bit set. */
static bool json_variant_is_magic(const JsonVariant *v) {
if (!v)
return false;
return v < _JSON_VARIANT_MAGIC_MAX;
}
static bool json_variant_is_const_string(const JsonVariant *v) {
if (v < _JSON_VARIANT_MAGIC_MAX)
return false;
/* A proper JsonVariant is aligned to whatever malloc() aligns things too, which is definitely not uneven. We
* hence use all uneven pointers as indicators for const strings. */
return (((uintptr_t) v) & 1) != 0;
}
static bool json_variant_is_regular(const JsonVariant *v) {
if (v < _JSON_VARIANT_MAGIC_MAX)
return false;
return (((uintptr_t) v) & 1) == 0;
}
static JsonVariant *json_variant_dereference(JsonVariant *v) {
/* Recursively dereference variants that are references to other variants */
if (!v)
return NULL;
if (!json_variant_is_regular(v))
return v;
if (!v->is_reference)
return v;
return json_variant_dereference(v->reference);
}
static uint16_t json_variant_depth(JsonVariant *v) {
v = json_variant_dereference(v);
if (!v)
return 0;
if (!json_variant_is_regular(v))
return 0;
return v->depth;
}
static JsonVariant *json_variant_normalize(JsonVariant *v) {
/* Converts json variants to their normalized form, i.e. fully dereferenced and wherever possible converted to
* the "magic" version if there is one */
if (!v)
return NULL;
v = json_variant_dereference(v);
switch (json_variant_type(v)) {
case JSON_VARIANT_BOOLEAN:
return json_variant_boolean(v) ? JSON_VARIANT_MAGIC_TRUE : JSON_VARIANT_MAGIC_FALSE;
case JSON_VARIANT_NULL:
return JSON_VARIANT_MAGIC_NULL;
case JSON_VARIANT_INTEGER:
return json_variant_integer(v) == 0 ? JSON_VARIANT_MAGIC_ZERO_INTEGER : v;
case JSON_VARIANT_UNSIGNED:
return json_variant_unsigned(v) == 0 ? JSON_VARIANT_MAGIC_ZERO_UNSIGNED : v;
case JSON_VARIANT_REAL:
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
return json_variant_real(v) == 0.0 ? JSON_VARIANT_MAGIC_ZERO_REAL : v;
#pragma GCC diagnostic pop
case JSON_VARIANT_STRING:
return isempty(json_variant_string(v)) ? JSON_VARIANT_MAGIC_EMPTY_STRING : v;
case JSON_VARIANT_ARRAY:
return json_variant_elements(v) == 0 ? JSON_VARIANT_MAGIC_EMPTY_ARRAY : v;
case JSON_VARIANT_OBJECT:
return json_variant_elements(v) == 0 ? JSON_VARIANT_MAGIC_EMPTY_OBJECT : v;
default:
return v;
}
}
static JsonVariant *json_variant_conservative_normalize(JsonVariant *v) {
/* Much like json_variant_normalize(), but won't simplify if the variant has a source/line location attached to
* it, in order not to lose context */
if (!v)
return NULL;
if (!json_variant_is_regular(v))
return v;
if (v->source || v->line > 0 || v->column > 0)
return v;
return json_variant_normalize(v);
}
static int json_variant_new(JsonVariant **ret, JsonVariantType type, size_t space) {
JsonVariant *v;
assert_return(ret, -EINVAL);
v = malloc0(offsetof(JsonVariant, value) + space);
if (!v)
return -ENOMEM;
v->n_ref = 1;
v->type = type;
*ret = v;
return 0;
}
int json_variant_new_integer(JsonVariant **ret, intmax_t i) {
JsonVariant *v;
int r;
assert_return(ret, -EINVAL);
if (i == 0) {
*ret = JSON_VARIANT_MAGIC_ZERO_INTEGER;
return 0;
}
r = json_variant_new(&v, JSON_VARIANT_INTEGER, sizeof(i));
if (r < 0)
return r;
v->value.integer = i;
*ret = v;
return 0;
}
int json_variant_new_unsigned(JsonVariant **ret, uintmax_t u) {
JsonVariant *v;
int r;
assert_return(ret, -EINVAL);
if (u == 0) {
*ret = JSON_VARIANT_MAGIC_ZERO_UNSIGNED;
return 0;
}
r = json_variant_new(&v, JSON_VARIANT_UNSIGNED, sizeof(u));
if (r < 0)
return r;
v->value.unsig = u;
*ret = v;
return 0;
}
int json_variant_new_real(JsonVariant **ret, long double d) {
JsonVariant *v;
int r;
assert_return(ret, -EINVAL);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
if (d == 0.0) {
#pragma GCC diagnostic pop
*ret = JSON_VARIANT_MAGIC_ZERO_REAL;
return 0;
}
r = json_variant_new(&v, JSON_VARIANT_REAL, sizeof(d));
if (r < 0)
return r;
v->value.real = d;
*ret = v;
return 0;
}
int json_variant_new_boolean(JsonVariant **ret, bool b) {
assert_return(ret, -EINVAL);
if (b)
*ret = JSON_VARIANT_MAGIC_TRUE;
else
*ret = JSON_VARIANT_MAGIC_FALSE;
return 0;
}
int json_variant_new_null(JsonVariant **ret) {
assert_return(ret, -EINVAL);
*ret = JSON_VARIANT_MAGIC_NULL;
return 0;
}
int json_variant_new_stringn(JsonVariant **ret, const char *s, size_t n) {
JsonVariant *v;
int r;
assert_return(ret, -EINVAL);
if (!s) {
assert_return(n == 0, -EINVAL);
return json_variant_new_null(ret);
}
if (n == 0) {
*ret = JSON_VARIANT_MAGIC_EMPTY_STRING;
return 0;
}
r = json_variant_new(&v, JSON_VARIANT_STRING, n + 1);
if (r < 0)
return r;
memcpy(v->string, s, n);
v->string[n] = 0;
*ret = v;
return 0;
}
static void json_variant_set(JsonVariant *a, JsonVariant *b) {
assert(a);
b = json_variant_dereference(b);
if (!b) {
a->type = JSON_VARIANT_NULL;
return;
}
a->type = json_variant_type(b);
switch (a->type) {
case JSON_VARIANT_INTEGER:
a->value.integer = json_variant_integer(b);
break;
case JSON_VARIANT_UNSIGNED:
a->value.unsig = json_variant_unsigned(b);
break;
case JSON_VARIANT_REAL:
a->value.real = json_variant_real(b);
break;
case JSON_VARIANT_BOOLEAN:
a->value.boolean = json_variant_boolean(b);
break;
case JSON_VARIANT_STRING: {
const char *s;
assert_se(s = json_variant_string(b));
/* Short strings we can store inline */
if (strnlen(s, INLINE_STRING_MAX+1) <= INLINE_STRING_MAX) {
strcpy(a->string, s);
break;
}
/* For longer strings, use a reference… */
_fallthrough_;
}
case JSON_VARIANT_ARRAY:
case JSON_VARIANT_OBJECT:
a->is_reference = true;
a->reference = json_variant_ref(json_variant_conservative_normalize(b));
break;
case JSON_VARIANT_NULL:
break;
default:
assert_not_reached("Unexpected variant type");
}
}
static void json_variant_copy_source(JsonVariant *v, JsonVariant *from) {
assert(v);
assert(from);
if (!json_variant_is_regular(from))
return;
v->line = from->line;
v->column = from->column;
v->source = json_source_ref(from->source);
}
int json_variant_new_array(JsonVariant **ret, JsonVariant **array, size_t n) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
assert_return(ret, -EINVAL);
if (n == 0) {
*ret = JSON_VARIANT_MAGIC_EMPTY_ARRAY;
return 0;
}
assert_return(array, -EINVAL);
v = new(JsonVariant, n + 1);
if (!v)
return -ENOMEM;
*v = (JsonVariant) {
.n_ref = 1,
.type = JSON_VARIANT_ARRAY,
};
for (v->n_elements = 0; v->n_elements < n; v->n_elements++) {
JsonVariant *w = v + 1 + v->n_elements,
*c = array[v->n_elements];
uint16_t d;
d = json_variant_depth(c);
if (d >= DEPTH_MAX) /* Refuse too deep nesting */
return -ELNRNG;
if (d >= v->depth)
v->depth = d + 1;
*w = (JsonVariant) {
.is_embedded = true,
.parent = v,
};
json_variant_set(w, c);
json_variant_copy_source(w, c);
}
*ret = TAKE_PTR(v);
return 0;
}
int json_variant_new_array_bytes(JsonVariant **ret, const void *p, size_t n) {
JsonVariant *v;
size_t i;
assert_return(ret, -EINVAL);
if (n == 0) {
*ret = JSON_VARIANT_MAGIC_EMPTY_ARRAY;
return 0;
}
assert_return(p, -EINVAL);
v = new(JsonVariant, n + 1);
if (!v)
return -ENOMEM;
*v = (JsonVariant) {
.n_ref = 1,
.type = JSON_VARIANT_ARRAY,
.n_elements = n,
.depth = 1,
};
for (i = 0; i < n; i++) {
JsonVariant *w = v + 1 + i;
*w = (JsonVariant) {
.is_embedded = true,
.parent = v,
.type = JSON_VARIANT_UNSIGNED,
.value.unsig = ((const uint8_t*) p)[i],
};
}
*ret = v;
return 0;
}
int json_variant_new_array_strv(JsonVariant **ret, char **l) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
size_t n;
int r;
assert(ret);
n = strv_length(l);
if (n == 0) {
*ret = JSON_VARIANT_MAGIC_EMPTY_ARRAY;
return 0;
}
v = new(JsonVariant, n + 1);
if (!v)
return -ENOMEM;
*v = (JsonVariant) {
.n_ref = 1,
.type = JSON_VARIANT_ARRAY,
.depth = 1,
};
for (v->n_elements = 0; v->n_elements < n; v->n_elements++) {
JsonVariant *w = v + 1 + v->n_elements;
size_t k;
*w = (JsonVariant) {
.is_embedded = true,
.parent = v,
.type = JSON_VARIANT_STRING,
};
k = strlen(l[v->n_elements]);
if (k > INLINE_STRING_MAX) {
/* If string is too long, store it as reference. */
r = json_variant_new_stringn(&w->reference, l[v->n_elements], k);
if (r < 0)
return r;
w->is_reference = true;
} else
memcpy(w->string, l[v->n_elements], k+1);
}
*ret = TAKE_PTR(v);
return 0;
}
int json_variant_new_object(JsonVariant **ret, JsonVariant **array, size_t n) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
assert_return(ret, -EINVAL);
if (n == 0) {
*ret = JSON_VARIANT_MAGIC_EMPTY_OBJECT;
return 0;
}
assert_return(array, -EINVAL);
assert_return(n % 2 == 0, -EINVAL);
v = new(JsonVariant, n + 1);
if (!v)
return -ENOMEM;
*v = (JsonVariant) {
.n_ref = 1,
.type = JSON_VARIANT_OBJECT,
};
for (v->n_elements = 0; v->n_elements < n; v->n_elements++) {
JsonVariant *w = v + 1 + v->n_elements,
*c = array[v->n_elements];
uint16_t d;
if ((v->n_elements & 1) == 0 &&
!json_variant_is_string(c))
return -EINVAL; /* Every second one needs to be a string, as it is the key name */
d = json_variant_depth(c);
if (d >= DEPTH_MAX) /* Refuse too deep nesting */
return -ELNRNG;
if (d >= v->depth)
v->depth = d + 1;
*w = (JsonVariant) {
.is_embedded = true,
.parent = v,
};
json_variant_set(w, c);
json_variant_copy_source(w, c);
}
*ret = TAKE_PTR(v);
return 0;
}
static void json_variant_free_inner(JsonVariant *v) {
assert(v);
if (!json_variant_is_regular(v))
return;
json_source_unref(v->source);
if (v->is_reference) {
json_variant_unref(v->reference);
return;
}
if (IN_SET(v->type, JSON_VARIANT_ARRAY, JSON_VARIANT_OBJECT)) {
size_t i;
for (i = 0; i < v->n_elements; i++)
json_variant_free_inner(v + 1 + i);
}
}
JsonVariant *json_variant_ref(JsonVariant *v) {
if (!v)
return NULL;
if (!json_variant_is_regular(v))
return v;
if (v->is_embedded)
json_variant_ref(v->parent); /* ref the compounding variant instead */
else {
assert(v->n_ref > 0);
v->n_ref++;
}
return v;
}
JsonVariant *json_variant_unref(JsonVariant *v) {
if (!v)
return NULL;
if (!json_variant_is_regular(v))
return NULL;
if (v->is_embedded)
json_variant_unref(v->parent);
else {
assert(v->n_ref > 0);
v->n_ref--;
if (v->n_ref == 0) {
json_variant_free_inner(v);
free(v);
}
}
return NULL;
}
void json_variant_unref_many(JsonVariant **array, size_t n) {
size_t i;
assert(array || n == 0);
for (i = 0; i < n; i++)
json_variant_unref(array[i]);
}
const char *json_variant_string(JsonVariant *v) {
if (!v)
return NULL;
if (v == JSON_VARIANT_MAGIC_EMPTY_STRING)
return "";
if (json_variant_is_magic(v))
goto mismatch;
if (json_variant_is_const_string(v)) {
uintptr_t p = (uintptr_t) v;
assert((p & 1) != 0);
return (const char*) (p ^ 1U);
}
if (v->is_reference)
return json_variant_string(v->reference);
if (v->type != JSON_VARIANT_STRING)
goto mismatch;
return v->string;
mismatch:
log_debug("Non-string JSON variant requested as string, returning NULL.");
return NULL;
}
bool json_variant_boolean(JsonVariant *v) {
if (!v)
goto mismatch;
if (v == JSON_VARIANT_MAGIC_TRUE)
return true;
if (v == JSON_VARIANT_MAGIC_FALSE)
return false;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->type != JSON_VARIANT_BOOLEAN)
goto mismatch;
if (v->is_reference)
return json_variant_boolean(v->reference);
return v->value.boolean;
mismatch:
log_debug("Non-boolean JSON variant requested as boolean, returning false.");
return false;
}
intmax_t json_variant_integer(JsonVariant *v) {
if (!v)
goto mismatch;
if (v == JSON_VARIANT_MAGIC_ZERO_INTEGER ||
v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED ||
v == JSON_VARIANT_MAGIC_ZERO_REAL)
return 0;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->is_reference)
return json_variant_integer(v->reference);
switch (v->type) {
case JSON_VARIANT_INTEGER:
return v->value.integer;
case JSON_VARIANT_UNSIGNED:
if (v->value.unsig <= INTMAX_MAX)
return (intmax_t) v->value.unsig;
log_debug("Unsigned integer %ju requested as signed integer and out of range, returning 0.", v->value.unsig);
return 0;
case JSON_VARIANT_REAL: {
intmax_t converted;
converted = (intmax_t) v->value.real;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
if ((long double) converted == v->value.real)
#pragma GCC diagnostic pop
return converted;
log_debug("Real %Lg requested as integer, and cannot be converted losslessly, returning 0.", v->value.real);
return 0;
}
default:
break;
}
mismatch:
log_debug("Non-integer JSON variant requested as integer, returning 0.");
return 0;
}
uintmax_t json_variant_unsigned(JsonVariant *v) {
if (!v)
goto mismatch;
if (v == JSON_VARIANT_MAGIC_ZERO_INTEGER ||
v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED ||
v == JSON_VARIANT_MAGIC_ZERO_REAL)
return 0;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->is_reference)
return json_variant_integer(v->reference);
switch (v->type) {
case JSON_VARIANT_INTEGER:
if (v->value.integer >= 0)
return (uintmax_t) v->value.integer;
log_debug("Signed integer %ju requested as unsigned integer and out of range, returning 0.", v->value.integer);
return 0;
case JSON_VARIANT_UNSIGNED:
return v->value.unsig;
case JSON_VARIANT_REAL: {
uintmax_t converted;
converted = (uintmax_t) v->value.real;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
if ((long double) converted == v->value.real)
#pragma GCC diagnostic pop
return converted;
log_debug("Real %Lg requested as unsigned integer, and cannot be converted losslessly, returning 0.", v->value.real);
return 0;
}
default:
break;
}
mismatch:
log_debug("Non-integer JSON variant requested as unsigned, returning 0.");
return 0;
}
long double json_variant_real(JsonVariant *v) {
if (!v)
return 0.0;
if (v == JSON_VARIANT_MAGIC_ZERO_INTEGER ||
v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED ||
v == JSON_VARIANT_MAGIC_ZERO_REAL)
return 0.0;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->is_reference)
return json_variant_real(v->reference);
switch (v->type) {
case JSON_VARIANT_REAL:
return v->value.real;
case JSON_VARIANT_INTEGER: {
long double converted;
converted = (long double) v->value.integer;
if ((intmax_t) converted == v->value.integer)
return converted;
log_debug("Signed integer %ji requested as real, and cannot be converted losslessly, returning 0.", v->value.integer);
return 0.0;
}
case JSON_VARIANT_UNSIGNED: {
long double converted;
converted = (long double) v->value.unsig;
if ((uintmax_t) converted == v->value.unsig)
return converted;
log_debug("Unsigned integer %ju requested as real, and cannot be converted losslessly, returning 0.", v->value.unsig);
return 0.0;
}
default:
break;
}
mismatch:
log_debug("Non-integer JSON variant requested as integer, returning 0.");
return 0.0;
}
bool json_variant_is_negative(JsonVariant *v) {
if (!v)
goto mismatch;
if (v == JSON_VARIANT_MAGIC_ZERO_INTEGER ||
v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED ||
v == JSON_VARIANT_MAGIC_ZERO_REAL)
return false;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->is_reference)
return json_variant_is_negative(v->reference);
/* This function is useful as checking whether numbers are negative is pretty complex since we have three types
* of numbers. And some JSON code (OCI for example) uses negative numbers to mark "not defined" numeric
* values. */
switch (v->type) {
case JSON_VARIANT_REAL:
return v->value.real < 0;
case JSON_VARIANT_INTEGER:
return v->value.integer < 0;
case JSON_VARIANT_UNSIGNED:
return false;
default:
break;
}
mismatch:
log_debug("Non-integer JSON variant tested for negativity, returning false.");
return false;
}
JsonVariantType json_variant_type(JsonVariant *v) {
if (!v)
return _JSON_VARIANT_TYPE_INVALID;
if (json_variant_is_const_string(v))
return JSON_VARIANT_STRING;
if (v == JSON_VARIANT_MAGIC_TRUE || v == JSON_VARIANT_MAGIC_FALSE)
return JSON_VARIANT_BOOLEAN;
if (v == JSON_VARIANT_MAGIC_NULL)
return JSON_VARIANT_NULL;
if (v == JSON_VARIANT_MAGIC_ZERO_INTEGER)
return JSON_VARIANT_INTEGER;
if (v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED)
return JSON_VARIANT_UNSIGNED;
if (v == JSON_VARIANT_MAGIC_ZERO_REAL)
return JSON_VARIANT_REAL;
if (v == JSON_VARIANT_MAGIC_EMPTY_STRING)
return JSON_VARIANT_STRING;
if (v == JSON_VARIANT_MAGIC_EMPTY_ARRAY)
return JSON_VARIANT_ARRAY;
if (v == JSON_VARIANT_MAGIC_EMPTY_OBJECT)
return JSON_VARIANT_OBJECT;
return v->type;
}
bool json_variant_has_type(JsonVariant *v, JsonVariantType type) {
JsonVariantType rt;
v = json_variant_dereference(v);
if (!v)
return false;
rt = json_variant_type(v);
if (rt == type)
return true;
/* If it's a const string, then it only can be a string, and if it is not, it's not */
if (json_variant_is_const_string(v))
return false;
/* All three magic zeroes qualify as integer, unsigned and as real */
if ((v == JSON_VARIANT_MAGIC_ZERO_INTEGER || v == JSON_VARIANT_MAGIC_ZERO_UNSIGNED || v == JSON_VARIANT_MAGIC_ZERO_REAL) &&
IN_SET(type, JSON_VARIANT_INTEGER, JSON_VARIANT_UNSIGNED, JSON_VARIANT_REAL, JSON_VARIANT_NUMBER))
return true;
/* All other magic variant types are only equal to themselves */
if (json_variant_is_magic(v))
return false;
/* Handle the "number" pseudo type */
if (type == JSON_VARIANT_NUMBER)
return IN_SET(rt, JSON_VARIANT_INTEGER, JSON_VARIANT_UNSIGNED, JSON_VARIANT_REAL);
/* Integer conversions are OK in many cases */
if (rt == JSON_VARIANT_INTEGER && type == JSON_VARIANT_UNSIGNED)
return v->value.integer >= 0;
if (rt == JSON_VARIANT_UNSIGNED && type == JSON_VARIANT_INTEGER)
return v->value.unsig <= INTMAX_MAX;
/* Any integer that can be converted lossley to a real and back may also be considered a real */
if (rt == JSON_VARIANT_INTEGER && type == JSON_VARIANT_REAL)
return (intmax_t) (long double) v->value.integer == v->value.integer;
if (rt == JSON_VARIANT_UNSIGNED && type == JSON_VARIANT_REAL)
return (uintmax_t) (long double) v->value.unsig == v->value.unsig;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
/* Any real that can be converted losslessly to an integer and back may also be considered an integer */
if (rt == JSON_VARIANT_REAL && type == JSON_VARIANT_INTEGER)
return (long double) (intmax_t) v->value.real == v->value.real;
if (rt == JSON_VARIANT_REAL && type == JSON_VARIANT_UNSIGNED)
return (long double) (uintmax_t) v->value.real == v->value.real;
#pragma GCC diagnostic pop
return false;
}
size_t json_variant_elements(JsonVariant *v) {
if (!v)
return 0;
if (v == JSON_VARIANT_MAGIC_EMPTY_ARRAY ||
v == JSON_VARIANT_MAGIC_EMPTY_OBJECT)
return 0;
if (!json_variant_is_regular(v))
goto mismatch;
if (!IN_SET(v->type, JSON_VARIANT_ARRAY, JSON_VARIANT_OBJECT))
goto mismatch;
if (v->is_reference)
return json_variant_elements(v->reference);
return v->n_elements;
mismatch:
log_debug("Number of elements in non-array/non-object JSON variant requested, returning 0.");
return 0;
}
JsonVariant *json_variant_by_index(JsonVariant *v, size_t idx) {
if (!v)
return NULL;
if (v == JSON_VARIANT_MAGIC_EMPTY_ARRAY ||
v == JSON_VARIANT_MAGIC_EMPTY_OBJECT)
return NULL;
if (!json_variant_is_regular(v))
goto mismatch;
if (!IN_SET(v->type, JSON_VARIANT_ARRAY, JSON_VARIANT_OBJECT))
goto mismatch;
if (v->is_reference)
return json_variant_by_index(v->reference, idx);
if (idx >= v->n_elements)
return NULL;
return json_variant_conservative_normalize(v + 1 + idx);
mismatch:
log_debug("Element in non-array/non-object JSON variant requested by index, returning NULL.");
return NULL;
}
JsonVariant *json_variant_by_key_full(JsonVariant *v, const char *key, JsonVariant **ret_key) {
size_t i;
if (!v)
goto not_found;
if (!key)
goto not_found;
if (v == JSON_VARIANT_MAGIC_EMPTY_OBJECT)
goto not_found;
if (!json_variant_is_regular(v))
goto mismatch;
if (v->type != JSON_VARIANT_OBJECT)
goto mismatch;
if (v->is_reference)
return json_variant_by_key(v->reference, key);
for (i = 0; i < v->n_elements; i += 2) {
JsonVariant *p;
p = json_variant_dereference(v + 1 + i);
if (!json_variant_has_type(p, JSON_VARIANT_STRING))
continue;
if (streq(json_variant_string(p), key)) {
if (ret_key)
*ret_key = json_variant_conservative_normalize(v + 1 + i);
return json_variant_conservative_normalize(v + 1 + i + 1);
}
}
not_found:
if (ret_key)
*ret_key = NULL;
return NULL;
mismatch:
log_debug("Element in non-object JSON variant requested by key, returning NULL.");
if (ret_key)
*ret_key = NULL;
return NULL;
}
JsonVariant *json_variant_by_key(JsonVariant *v, const char *key) {
return json_variant_by_key_full(v, key, NULL);
}
bool json_variant_equal(JsonVariant *a, JsonVariant *b) {
JsonVariantType t;
a = json_variant_normalize(a);
b = json_variant_normalize(b);
if (a == b)
return true;
t = json_variant_type(a);
if (!json_variant_has_type(b, t))
return false;
switch (t) {
case JSON_VARIANT_STRING:
return streq(json_variant_string(a), json_variant_string(b));
case JSON_VARIANT_INTEGER:
return json_variant_integer(a) == json_variant_integer(b);
case JSON_VARIANT_UNSIGNED:
return json_variant_unsigned(a) == json_variant_unsigned(b);
case JSON_VARIANT_REAL:
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
return json_variant_real(a) == json_variant_real(b);
#pragma GCC diagnostic pop
case JSON_VARIANT_BOOLEAN:
return json_variant_boolean(a) == json_variant_boolean(b);
case JSON_VARIANT_NULL:
return true;
case JSON_VARIANT_ARRAY: {
size_t i, n;
n = json_variant_elements(a);
if (n != json_variant_elements(b))
return false;
for (i = 0; i < n; i++) {
if (!json_variant_equal(json_variant_by_index(a, i), json_variant_by_index(b, i)))
return false;
}
return true;
}
case JSON_VARIANT_OBJECT: {
size_t i, n;
n = json_variant_elements(a);
if (n != json_variant_elements(b))
return false;
/* Iterate through all keys in 'a' */
for (i = 0; i < n; i += 2) {
bool found = false;
size_t j;
/* Match them against all keys in 'b' */
for (j = 0; j < n; j += 2) {
JsonVariant *key_b;
key_b = json_variant_by_index(b, j);
/* During the first iteration unmark everything */
if (i == 0)
key_b->is_marked = false;
else if (key_b->is_marked) /* In later iterations if we already marked something, don't bother with it again */
continue;
if (found)
continue;
if (json_variant_equal(json_variant_by_index(a, i), key_b) &&
json_variant_equal(json_variant_by_index(a, i+1), json_variant_by_index(b, j+1))) {
/* Key and values match! */
key_b->is_marked = found = true;
/* In the first iteration we continue the inner loop since we want to mark
* everything, otherwise exit the loop quickly after we found what we were
* looking for. */
if (i != 0)
break;
}
}
if (!found)
return false;
}
return true;
}
default:
assert_not_reached("Unknown variant type.");
}
}
int json_variant_get_source(JsonVariant *v, const char **ret_source, unsigned *ret_line, unsigned *ret_column) {
assert_return(v, -EINVAL);
if (ret_source)
*ret_source = json_variant_is_regular(v) && v->source ? v->source->name : NULL;
if (ret_line)
*ret_line = json_variant_is_regular(v) ? v->line : 0;
if (ret_column)
*ret_column = json_variant_is_regular(v) ? v->column : 0;
return 0;
}
static int print_source(FILE *f, JsonVariant *v, JsonFormatFlags flags, bool whitespace) {
size_t w, k;
if (!FLAGS_SET(flags, JSON_FORMAT_SOURCE|JSON_FORMAT_PRETTY))
return 0;
if (!json_variant_is_regular(v))
return 0;
if (!v->source && v->line == 0 && v->column == 0)
return 0;
/* The max width we need to format the line numbers for this source file */
w = (v->source && v->source->max_line > 0) ?
DECIMAL_STR_WIDTH(v->source->max_line) :
DECIMAL_STR_MAX(unsigned)-1;
k = (v->source && v->source->max_column > 0) ?
DECIMAL_STR_WIDTH(v->source->max_column) :
DECIMAL_STR_MAX(unsigned) -1;
if (whitespace) {
size_t i, n;
n = 1 + (v->source ? strlen(v->source->name) : 0) +
((v->source && (v->line > 0 || v->column > 0)) ? 1 : 0) +
(v->line > 0 ? w : 0) +
(((v->source || v->line > 0) && v->column > 0) ? 1 : 0) +
(v->column > 0 ? k : 0) +
2;
for (i = 0; i < n; i++)
fputc(' ', f);
} else {
fputc('[', f);
if (v->source)
fputs(v->source->name, f);
if (v->source && (v->line > 0 || v->column > 0))
fputc(':', f);
if (v->line > 0)
fprintf(f, "%*u", (int) w, v->line);
if ((v->source || v->line > 0) || v->column > 0)
fputc(':', f);
if (v->column > 0)
fprintf(f, "%*u", (int) k, v->column);
fputc(']', f);
fputc(' ', f);
}
return 0;
}
static int json_format(FILE *f, JsonVariant *v, JsonFormatFlags flags, const char *prefix) {
int r;
assert(f);
assert(v);
switch (json_variant_type(v)) {
case JSON_VARIANT_REAL: {
locale_t loc;
loc = newlocale(LC_NUMERIC_MASK, "C", (locale_t) 0);
if (loc == (locale_t) 0)
return -errno;
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_HIGHLIGHT_BLUE, f);
fprintf(f, "%.*Le", DECIMAL_DIG, json_variant_real(v));
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
freelocale(loc);
break;
}
case JSON_VARIANT_INTEGER:
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_HIGHLIGHT_BLUE, f);
fprintf(f, "%" PRIdMAX, json_variant_integer(v));
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
break;
case JSON_VARIANT_UNSIGNED:
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_HIGHLIGHT_BLUE, f);
fprintf(f, "%" PRIuMAX, json_variant_unsigned(v));
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
break;
case JSON_VARIANT_BOOLEAN:
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_HIGHLIGHT, f);
if (json_variant_boolean(v))
fputs("true", f);
else
fputs("false", f);
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
break;
case JSON_VARIANT_NULL:
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_HIGHLIGHT, f);
fputs("null", f);
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
break;
case JSON_VARIANT_STRING: {
const char *q;
fputc('"', f);
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_GREEN, f);
for (q = json_variant_string(v); *q; q++) {
switch (*q) {
case '"':
fputs("\\\"", f);
break;
case '\\':
fputs("\\\\", f);
break;
case '\b':
fputs("\\b", f);
break;
case '\f':
fputs("\\f", f);
break;
case '\n':
fputs("\\n", f);
break;
case '\r':
fputs("\\r", f);
break;
case '\t':
fputs("\\t", f);
break;
default:
if ((signed char) *q >= 0 && *q < ' ')
fprintf(f, "\\u%04x", *q);
else
fputc(*q, f);
break;
}
}
if (flags & JSON_FORMAT_COLOR)
fputs(ANSI_NORMAL, f);
fputc('"', f);
break;
}
case JSON_VARIANT_ARRAY: {
size_t i, n;
n = json_variant_elements(v);
if (n == 0)
fputs("[]", f);
else {
_cleanup_free_ char *joined = NULL;
const char *prefix2;
if (flags & JSON_FORMAT_PRETTY) {
joined = strjoin(strempty(prefix), "\t");
if (!joined)
return -ENOMEM;
prefix2 = joined;
fputs("[\n", f);
} else {
prefix2 = strempty(prefix);
fputc('[', f);
}
for (i = 0; i < n; i++) {
JsonVariant *e;
assert_se(e = json_variant_by_index(v, i));
if (i > 0) {
if (flags & JSON_FORMAT_PRETTY)
fputs(",\n", f);
else
fputc(',', f);
}
if (flags & JSON_FORMAT_PRETTY) {
print_source(f, e, flags, false);
fputs(prefix2, f);
}
r = json_format(f, e, flags, prefix2);
if (r < 0)
return r;
}
if (flags & JSON_FORMAT_PRETTY) {
fputc('\n', f);
print_source(f, v, flags, true);
fputs(strempty(prefix), f);
}
fputc(']', f);
}
break;
}
case JSON_VARIANT_OBJECT: {
size_t i, n;
n = json_variant_elements(v);
if (n == 0)
fputs("{}", f);
else {
_cleanup_free_ char *joined = NULL;
const char *prefix2;
if (flags & JSON_FORMAT_PRETTY) {
joined = strjoin(strempty(prefix), "\t");
if (!joined)
return -ENOMEM;
prefix2 = joined;
fputs("{\n", f);
} else {
prefix2 = strempty(prefix);
fputc('{', f);
}
for (i = 0; i < n; i += 2) {
JsonVariant *e;
e = json_variant_by_index(v, i);
if (i > 0) {
if (flags & JSON_FORMAT_PRETTY)
fputs(",\n", f);
else
fputc(',', f);
}
if (flags & JSON_FORMAT_PRETTY) {
print_source(f, e, flags, false);
fputs(prefix2, f);
}
r = json_format(f, e, flags, prefix2);
if (r < 0)
return r;
fputs(flags & JSON_FORMAT_PRETTY ? " : " : ":", f);
r = json_format(f, json_variant_by_index(v, i+1), flags, prefix2);
if (r < 0)
return r;
}
if (flags & JSON_FORMAT_PRETTY) {
fputc('\n', f);
print_source(f, v, flags, true);
fputs(strempty(prefix), f);
}
fputc('}', f);
}
break;
}
default:
assert_not_reached("Unexpected variant type.");
}
return 0;
}
int json_variant_format(JsonVariant *v, JsonFormatFlags flags, char **ret) {
_cleanup_free_ char *s = NULL;
size_t sz = 0;
int r;
assert_return(v, -EINVAL);
assert_return(ret, -EINVAL);
{
_cleanup_fclose_ FILE *f = NULL;
f = open_memstream_unlocked(&s, &sz);
if (!f)
return -ENOMEM;
json_variant_dump(v, flags, f, NULL);
r = fflush_and_check(f);
}
if (r < 0)
return r;
assert(s);
*ret = TAKE_PTR(s);
return (int) sz;
}
void json_variant_dump(JsonVariant *v, JsonFormatFlags flags, FILE *f, const char *prefix) {
if (!v)
return;
if (!f)
f = stdout;
print_source(f, v, flags, false);
if (((flags & (JSON_FORMAT_COLOR_AUTO|JSON_FORMAT_COLOR)) == JSON_FORMAT_COLOR_AUTO) && colors_enabled())
flags |= JSON_FORMAT_COLOR;
if (flags & JSON_FORMAT_SSE)
fputs("data: ", f);
if (flags & JSON_FORMAT_SEQ)
fputc('\x1e', f); /* ASCII Record Separator */
json_format(f, v, flags, prefix);
if (flags & (JSON_FORMAT_PRETTY|JSON_FORMAT_SEQ|JSON_FORMAT_SSE|JSON_FORMAT_NEWLINE))
fputc('\n', f);
if (flags & JSON_FORMAT_SSE)
fputc('\n', f); /* In case of SSE add a second newline */
}
static int json_variant_copy(JsonVariant **nv, JsonVariant *v) {
JsonVariantType t;
JsonVariant *c;
JsonValue value;
const void *source;
size_t k;
assert(nv);
assert(v);
/* Let's copy the simple types literally, and the larger types by references */
t = json_variant_type(v);
switch (t) {
case JSON_VARIANT_INTEGER:
k = sizeof(intmax_t);
value.integer = json_variant_integer(v);
source = &value;
break;
case JSON_VARIANT_UNSIGNED:
k = sizeof(uintmax_t);
value.unsig = json_variant_unsigned(v);
source = &value;
break;
case JSON_VARIANT_REAL:
k = sizeof(long double);
value.real = json_variant_real(v);
source = &value;
break;
case JSON_VARIANT_BOOLEAN:
k = sizeof(bool);
value.boolean = json_variant_boolean(v);
source = &value;
break;
case JSON_VARIANT_NULL:
k = 0;
source = NULL;
break;
case JSON_VARIANT_STRING:
source = json_variant_string(v);
k = strnlen(source, INLINE_STRING_MAX + 1);
if (k <= INLINE_STRING_MAX) {
k ++;
break;
}
_fallthrough_;
default:
/* Everything else copy by reference */
c = malloc0(offsetof(JsonVariant, reference) + sizeof(JsonVariant*));
if (!c)
return -ENOMEM;
c->n_ref = 1;
c->type = t;
c->is_reference = true;
c->reference = json_variant_ref(json_variant_normalize(v));
*nv = c;
return 0;
}
c = malloc0(offsetof(JsonVariant, value) + k);
if (!c)
return -ENOMEM;
c->n_ref = 1;
c->type = t;
memcpy_safe(&c->value, source, k);
*nv = c;
return 0;
}
static bool json_single_ref(JsonVariant *v) {
/* Checks whether the caller is the single owner of the object, i.e. can get away with changing it */
if (!json_variant_is_regular(v))
return false;
if (v->is_embedded)
return json_single_ref(v->parent);
assert(v->n_ref > 0);
return v->n_ref == 1;
}
static int json_variant_set_source(JsonVariant **v, JsonSource *source, unsigned line, unsigned column) {
JsonVariant *w;
int r;
assert(v);
/* Patch in source and line/column number. Tries to do this in-place if the caller is the sole referencer of
* the object. If not, allocates a new object, possibly a surrogate for the original one */
if (!*v)
return 0;
if (source && line > source->max_line)
source->max_line = line;
if (source && column > source->max_column)
source->max_column = column;
if (!json_variant_is_regular(*v)) {
if (!source && line == 0 && column == 0)
return 0;
} else {
if (json_source_equal((*v)->source, source) &&
(*v)->line == line &&
(*v)->column == column)
return 0;
if (json_single_ref(*v)) { /* Sole reference? */
json_source_unref((*v)->source);
(*v)->source = json_source_ref(source);
(*v)->line = line;
(*v)->column = column;
return 1;
}
}
r = json_variant_copy(&w, *v);
if (r < 0)
return r;
assert(json_variant_is_regular(w));
assert(!w->is_embedded);
assert(w->n_ref == 1);
assert(!w->source);
w->source = json_source_ref(source);
w->line = line;
w->column = column;
json_variant_unref(*v);
*v = w;
return 1;
}
static void inc_lines_columns(unsigned *line, unsigned *column, const char *s, size_t n) {
assert(line);
assert(column);
assert(s || n == 0);
while (n > 0) {
if (*s == '\n') {
(*line)++;
*column = 1;
} else if ((signed char) *s >= 0 && *s < 127) /* Process ASCII chars quickly */
(*column)++;
else {
int w;
w = utf8_encoded_valid_unichar(s, n);
if (w < 0) /* count invalid unichars as normal characters */
w = 1;
else if ((size_t) w > n) /* never read more than the specified number of characters */
w = (int) n;
(*column)++;
s += w;
n -= w;
continue;
}
s++;
n--;
}
}
static int unhex_ucs2(const char *c, uint16_t *ret) {
int aa, bb, cc, dd;
uint16_t x;
assert(c);
assert(ret);
aa = unhexchar(c[0]);
if (aa < 0)
return -EINVAL;
bb = unhexchar(c[1]);
if (bb < 0)
return -EINVAL;
cc = unhexchar(c[2]);
if (cc < 0)
return -EINVAL;
dd = unhexchar(c[3]);
if (dd < 0)
return -EINVAL;
x = ((uint16_t) aa << 12) |
((uint16_t) bb << 8) |
((uint16_t) cc << 4) |
((uint16_t) dd);
if (x <= 0)
return -EINVAL;
*ret = x;
return 0;
}
static int json_parse_string(const char **p, char **ret) {
_cleanup_free_ char *s = NULL;
size_t n = 0, allocated = 0;
const char *c;
assert(p);
assert(*p);
assert(ret);
c = *p;
if (*c != '"')
return -EINVAL;
c++;
for (;;) {
int len;
/* Check for EOF */
if (*c == 0)
return -EINVAL;
/* Check for control characters 0x00..0x1f */
if (*c > 0 && *c < ' ')
return -EINVAL;
/* Check for control character 0x7f */
if (*c == 0x7f)
return -EINVAL;
if (*c == '"') {
if (!s) {
s = strdup("");
if (!s)
return -ENOMEM;
} else
s[n] = 0;
*p = c + 1;
*ret = TAKE_PTR(s);
return JSON_TOKEN_STRING;
}
if (*c == '\\') {
char ch = 0;
c++;
if (*c == 0)
return -EINVAL;
if (IN_SET(*c, '"', '\\', '/'))
ch = *c;
else if (*c == 'b')
ch = '\b';
else if (*c == 'f')
ch = '\f';
else if (*c == 'n')
ch = '\n';
else if (*c == 'r')
ch = '\r';
else if (*c == 't')
ch = '\t';
else if (*c == 'u') {
char16_t x;
int r;
r = unhex_ucs2(c + 1, &x);
if (r < 0)
return r;
c += 5;
if (!GREEDY_REALLOC(s, allocated, n + 5))
return -ENOMEM;
if (!utf16_is_surrogate(x))
n += utf8_encode_unichar(s + n, (char32_t) x);
else if (utf16_is_trailing_surrogate(x))
return -EINVAL;
else {
char16_t y;
if (c[0] != '\\' || c[1] != 'u')
return -EINVAL;
r = unhex_ucs2(c + 2, &y);
if (r < 0)
return r;
c += 6;
if (!utf16_is_trailing_surrogate(y))
return -EINVAL;
n += utf8_encode_unichar(s + n, utf16_surrogate_pair_to_unichar(x, y));
}
continue;
} else
return -EINVAL;
if (!GREEDY_REALLOC(s, allocated, n + 2))
return -ENOMEM;
s[n++] = ch;
c ++;
continue;
}
len = utf8_encoded_valid_unichar(c, (size_t) -1);
if (len < 0)
return len;
if (!GREEDY_REALLOC(s, allocated, n + len + 1))
return -ENOMEM;
memcpy(s + n, c, len);
n += len;
c += len;
}
}
static int json_parse_number(const char **p, JsonValue *ret) {
bool negative = false, exponent_negative = false, is_real = false;
long double x = 0.0, y = 0.0, exponent = 0.0, shift = 1.0;
intmax_t i = 0;
uintmax_t u = 0;
const char *c;
assert(p);
assert(*p);
assert(ret);
c = *p;
if (*c == '-') {
negative = true;
c++;
}
if (*c == '0')
c++;
else {
if (!strchr("123456789", *c) || *c == 0)
return -EINVAL;
do {
if (!is_real) {
if (negative) {
if (i < INTMAX_MIN / 10) /* overflow */
is_real = true;
else {
intmax_t t = 10 * i;
if (t < INTMAX_MIN + (*c - '0')) /* overflow */
is_real = true;
else
i = t - (*c - '0');
}
} else {
if (u > UINTMAX_MAX / 10) /* overflow */
is_real = true;
else {
uintmax_t t = 10 * u;
if (t > UINTMAX_MAX - (*c - '0')) /* overflow */
is_real = true;
else
u = t + (*c - '0');
}
}
}
x = 10.0 * x + (*c - '0');
c++;
} while (strchr("0123456789", *c) && *c != 0);
}
if (*c == '.') {
is_real = true;
c++;
if (!strchr("0123456789", *c) || *c == 0)
return -EINVAL;
do {
y = 10.0 * y + (*c - '0');
shift = 10.0 * shift;
c++;
} while (strchr("0123456789", *c) && *c != 0);
}
if (IN_SET(*c, 'e', 'E')) {
is_real = true;
c++;
if (*c == '-') {
exponent_negative = true;
c++;
} else if (*c == '+')
c++;
if (!strchr("0123456789", *c) || *c == 0)
return -EINVAL;
do {
exponent = 10.0 * exponent + (*c - '0');
c++;
} while (strchr("0123456789", *c) && *c != 0);
}
*p = c;
if (is_real) {
ret->real = ((negative ? -1.0 : 1.0) * (x + (y / shift))) * exp10l((exponent_negative ? -1.0 : 1.0) * exponent);
return JSON_TOKEN_REAL;
} else if (negative) {
ret->integer = i;
return JSON_TOKEN_INTEGER;
} else {
ret->unsig = u;
return JSON_TOKEN_UNSIGNED;
}
}
int json_tokenize(
const char **p,
char **ret_string,
JsonValue *ret_value,
unsigned *ret_line, /* 'ret_line' returns the line at the beginning of this token */
unsigned *ret_column,
void **state,
unsigned *line, /* 'line' is used as a line state, it always reflect the line we are at after the token was read */
unsigned *column) {
unsigned start_line, start_column;
const char *start, *c;
size_t n;
int t, r;
enum {
STATE_NULL,
STATE_VALUE,
STATE_VALUE_POST,
};
assert(p);
assert(*p);
assert(ret_string);
assert(ret_value);
assert(ret_line);
assert(ret_column);
assert(line);
assert(column);
assert(state);
t = PTR_TO_INT(*state);
if (t == STATE_NULL) {
*line = 1;
*column = 1;
t = STATE_VALUE;
}
/* Skip over the whitespace */
n = strspn(*p, WHITESPACE);
inc_lines_columns(line, column, *p, n);
c = *p + n;
/* Remember where we started processing this token */
start = c;
start_line = *line;
start_column = *column;
if (*c == 0) {
*ret_string = NULL;
*ret_value = JSON_VALUE_NULL;
r = JSON_TOKEN_END;
goto finish;
}
switch (t) {
case STATE_VALUE:
if (*c == '{') {
c++;
*state = INT_TO_PTR(STATE_VALUE);
r = JSON_TOKEN_OBJECT_OPEN;
goto null_return;
} else if (*c == '}') {
c++;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_OBJECT_CLOSE;
goto null_return;
} else if (*c == '[') {
c++;
*state = INT_TO_PTR(STATE_VALUE);
r = JSON_TOKEN_ARRAY_OPEN;
goto null_return;
} else if (*c == ']') {
c++;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_ARRAY_CLOSE;
goto null_return;
} else if (*c == '"') {
r = json_parse_string(&c, ret_string);
if (r < 0)
return r;
*ret_value = JSON_VALUE_NULL;
*state = INT_TO_PTR(STATE_VALUE_POST);
goto finish;
} else if (strchr("-0123456789", *c)) {
r = json_parse_number(&c, ret_value);
if (r < 0)
return r;
*ret_string = NULL;
*state = INT_TO_PTR(STATE_VALUE_POST);
goto finish;
} else if (startswith(c, "true")) {
*ret_string = NULL;
ret_value->boolean = true;
c += 4;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_BOOLEAN;
goto finish;
} else if (startswith(c, "false")) {
*ret_string = NULL;
ret_value->boolean = false;
c += 5;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_BOOLEAN;
goto finish;
} else if (startswith(c, "null")) {
*ret_string = NULL;
*ret_value = JSON_VALUE_NULL;
c += 4;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_NULL;
goto finish;
}
return -EINVAL;
case STATE_VALUE_POST:
if (*c == ':') {
c++;
*state = INT_TO_PTR(STATE_VALUE);
r = JSON_TOKEN_COLON;
goto null_return;
} else if (*c == ',') {
c++;
*state = INT_TO_PTR(STATE_VALUE);
r = JSON_TOKEN_COMMA;
goto null_return;
} else if (*c == '}') {
c++;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_OBJECT_CLOSE;
goto null_return;
} else if (*c == ']') {
c++;
*state = INT_TO_PTR(STATE_VALUE_POST);
r = JSON_TOKEN_ARRAY_CLOSE;
goto null_return;
}
return -EINVAL;
default:
assert_not_reached("Unexpected tokenizer state");
}
null_return:
*ret_string = NULL;
*ret_value = JSON_VALUE_NULL;
finish:
inc_lines_columns(line, column, start, c - start);
*p = c;
*ret_line = start_line;
*ret_column = start_column;
return r;
}
typedef enum JsonExpect {
/* The following values are used by json_parse() */
EXPECT_TOPLEVEL,
EXPECT_END,
EXPECT_OBJECT_FIRST_KEY,
EXPECT_OBJECT_NEXT_KEY,
EXPECT_OBJECT_COLON,
EXPECT_OBJECT_VALUE,
EXPECT_OBJECT_COMMA,
EXPECT_ARRAY_FIRST_ELEMENT,
EXPECT_ARRAY_NEXT_ELEMENT,
EXPECT_ARRAY_COMMA,
/* And these are used by json_build() */
EXPECT_ARRAY_ELEMENT,
EXPECT_OBJECT_KEY,
} JsonExpect;
typedef struct JsonStack {
JsonExpect expect;
JsonVariant **elements;
size_t n_elements, n_elements_allocated;
unsigned line_before;
unsigned column_before;
size_t n_suppress; /* When building: if > 0, suppress this many subsequent elements. If == (size_t) -1, suppress all subsequent elements */
} JsonStack;
static void json_stack_release(JsonStack *s) {
assert(s);
json_variant_unref_many(s->elements, s->n_elements);
s->elements = mfree(s->elements);
}
static int json_parse_internal(
const char **input,
JsonSource *source,
JsonVariant **ret,
unsigned *line,
unsigned *column,
bool continue_end) {
size_t n_stack = 1, n_stack_allocated = 0, i;
unsigned line_buffer = 0, column_buffer = 0;
void *tokenizer_state = NULL;
JsonStack *stack = NULL;
const char *p;
int r;
assert_return(input, -EINVAL);
assert_return(ret, -EINVAL);
p = *input;
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack))
return -ENOMEM;
stack[0] = (JsonStack) {
.expect = EXPECT_TOPLEVEL,
};
if (!line)
line = &line_buffer;
if (!column)
column = &column_buffer;
for (;;) {
_cleanup_free_ char *string = NULL;
unsigned line_token, column_token;
JsonVariant *add = NULL;
JsonStack *current;
JsonValue value;
int token;
assert(n_stack > 0);
current = stack + n_stack - 1;
if (continue_end && current->expect == EXPECT_END)
goto done;
token = json_tokenize(&p, &string, &value, &line_token, &column_token, &tokenizer_state, line, column);
if (token < 0) {
r = token;
goto finish;
}
switch (token) {
case JSON_TOKEN_END:
if (current->expect != EXPECT_END) {
r = -EINVAL;
goto finish;
}
assert(current->n_elements == 1);
assert(n_stack == 1);
goto done;
case JSON_TOKEN_COLON:
if (current->expect != EXPECT_OBJECT_COLON) {
r = -EINVAL;
goto finish;
}
current->expect = EXPECT_OBJECT_VALUE;
break;
case JSON_TOKEN_COMMA:
if (current->expect == EXPECT_OBJECT_COMMA)
current->expect = EXPECT_OBJECT_NEXT_KEY;
else if (current->expect == EXPECT_ARRAY_COMMA)
current->expect = EXPECT_ARRAY_NEXT_ELEMENT;
else {
r = -EINVAL;
goto finish;
}
break;
case JSON_TOKEN_OBJECT_OPEN:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack+1)) {
r = -ENOMEM;
goto finish;
}
current = stack + n_stack - 1;
/* Prepare the expect for when we return from the child */
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
stack[n_stack++] = (JsonStack) {
.expect = EXPECT_OBJECT_FIRST_KEY,
.line_before = line_token,
.column_before = column_token,
};
current = stack + n_stack - 1;
break;
case JSON_TOKEN_OBJECT_CLOSE:
if (!IN_SET(current->expect, EXPECT_OBJECT_FIRST_KEY, EXPECT_OBJECT_COMMA)) {
r = -EINVAL;
goto finish;
}
assert(n_stack > 1);
r = json_variant_new_object(&add, current->elements, current->n_elements);
if (r < 0)
goto finish;
line_token = current->line_before;
column_token = current->column_before;
json_stack_release(current);
n_stack--, current--;
break;
case JSON_TOKEN_ARRAY_OPEN:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack+1)) {
r = -ENOMEM;
goto finish;
}
current = stack + n_stack - 1;
/* Prepare the expect for when we return from the child */
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
stack[n_stack++] = (JsonStack) {
.expect = EXPECT_ARRAY_FIRST_ELEMENT,
.line_before = line_token,
.column_before = column_token,
};
break;
case JSON_TOKEN_ARRAY_CLOSE:
if (!IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_COMMA)) {
r = -EINVAL;
goto finish;
}
assert(n_stack > 1);
r = json_variant_new_array(&add, current->elements, current->n_elements);
if (r < 0)
goto finish;
line_token = current->line_before;
column_token = current->column_before;
json_stack_release(current);
n_stack--, current--;
break;
case JSON_TOKEN_STRING:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_FIRST_KEY, EXPECT_OBJECT_NEXT_KEY, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_string(&add, string);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (IN_SET(current->expect, EXPECT_OBJECT_FIRST_KEY, EXPECT_OBJECT_NEXT_KEY))
current->expect = EXPECT_OBJECT_COLON;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
case JSON_TOKEN_REAL:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_real(&add, value.real);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
case JSON_TOKEN_INTEGER:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_integer(&add, value.integer);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
case JSON_TOKEN_UNSIGNED:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_unsigned(&add, value.unsig);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
case JSON_TOKEN_BOOLEAN:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_boolean(&add, value.boolean);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
case JSON_TOKEN_NULL:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT)) {
r = -EINVAL;
goto finish;
}
r = json_variant_new_null(&add);
if (r < 0)
goto finish;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_COMMA;
else {
assert(IN_SET(current->expect, EXPECT_ARRAY_FIRST_ELEMENT, EXPECT_ARRAY_NEXT_ELEMENT));
current->expect = EXPECT_ARRAY_COMMA;
}
break;
default:
assert_not_reached("Unexpected token");
}
if (add) {
(void) json_variant_set_source(&add, source, line_token, column_token);
if (!GREEDY_REALLOC(current->elements, current->n_elements_allocated, current->n_elements + 1)) {
r = -ENOMEM;
goto finish;
}
current->elements[current->n_elements++] = add;
}
}
done:
assert(n_stack == 1);
assert(stack[0].n_elements == 1);
*ret = json_variant_ref(stack[0].elements[0]);
*input = p;
r = 0;
finish:
for (i = 0; i < n_stack; i++)
json_stack_release(stack + i);
free(stack);
return r;
}
int json_parse(const char *input, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column) {
return json_parse_internal(&input, NULL, ret, ret_line, ret_column, false);
}
int json_parse_continue(const char **p, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column) {
return json_parse_internal(p, NULL, ret, ret_line, ret_column, true);
}
int json_parse_file(FILE *f, const char *path, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column) {
_cleanup_(json_source_unrefp) JsonSource *source = NULL;
_cleanup_free_ char *text = NULL;
const char *p;
int r;
if (f)
r = read_full_stream(f, &text, NULL);
else if (path)
r = read_full_file(path, &text, NULL);
else
return -EINVAL;
if (r < 0)
return r;
if (path) {
source = json_source_new(path);
if (!source)
return -ENOMEM;
}
p = text;
return json_parse_internal(&p, source, ret, ret_line, ret_column, false);
}
int json_buildv(JsonVariant **ret, va_list ap) {
JsonStack *stack = NULL;
size_t n_stack = 1, n_stack_allocated = 0, i;
int r;
assert_return(ret, -EINVAL);
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack))
return -ENOMEM;
stack[0] = (JsonStack) {
.expect = EXPECT_TOPLEVEL,
};
for (;;) {
_cleanup_(json_variant_unrefp) JsonVariant *add = NULL;
size_t n_subtract = 0; /* how much to subtract from current->n_suppress, i.e. how many elements would
* have been added to the current variant */
JsonStack *current;
int command;
assert(n_stack > 0);
current = stack + n_stack - 1;
if (current->expect == EXPECT_END)
goto done;
command = va_arg(ap, int);
switch (command) {
case _JSON_BUILD_STRING: {
const char *p;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
p = va_arg(ap, const char *);
if (current->n_suppress == 0) {
r = json_variant_new_string(&add, p);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_INTEGER: {
intmax_t j;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
j = va_arg(ap, intmax_t);
if (current->n_suppress == 0) {
r = json_variant_new_integer(&add, j);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_UNSIGNED: {
uintmax_t j;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
j = va_arg(ap, uintmax_t);
if (current->n_suppress == 0) {
r = json_variant_new_unsigned(&add, j);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_REAL: {
long double d;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
d = va_arg(ap, long double);
if (current->n_suppress == 0) {
r = json_variant_new_real(&add, d);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_BOOLEAN: {
bool b;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
b = va_arg(ap, int);
if (current->n_suppress == 0) {
r = json_variant_new_boolean(&add, b);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_NULL:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
if (current->n_suppress == 0) {
r = json_variant_new_null(&add);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
case _JSON_BUILD_VARIANT:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
/* Note that we don't care for current->n_suppress here, after all the variant is already
* allocated anyway... */
add = va_arg(ap, JsonVariant*);
if (!add)
add = JSON_VARIANT_MAGIC_NULL;
else
json_variant_ref(add);
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
case _JSON_BUILD_LITERAL: {
const char *l;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
l = va_arg(ap, const char *);
if (l) {
/* Note that we don't care for current->n_suppress here, we should generate parsing
* errors even in suppressed object properties */
r = json_parse(l, &add, NULL, NULL);
if (r < 0)
goto finish;
} else
add = JSON_VARIANT_MAGIC_NULL;
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_ARRAY_BEGIN:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack+1)) {
r = -ENOMEM;
goto finish;
}
current = stack + n_stack - 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
stack[n_stack++] = (JsonStack) {
.expect = EXPECT_ARRAY_ELEMENT,
.n_suppress = current->n_suppress != 0 ? (size_t) -1 : 0, /* if we shall suppress the
* new array, then we should
* also suppress all array
* members */
};
break;
case _JSON_BUILD_ARRAY_END:
if (current->expect != EXPECT_ARRAY_ELEMENT) {
r = -EINVAL;
goto finish;
}
assert(n_stack > 1);
if (current->n_suppress == 0) {
r = json_variant_new_array(&add, current->elements, current->n_elements);
if (r < 0)
goto finish;
}
n_subtract = 1;
json_stack_release(current);
n_stack--, current--;
break;
case _JSON_BUILD_STRV: {
char **l;
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
l = va_arg(ap, char **);
if (current->n_suppress == 0) {
r = json_variant_new_array_strv(&add, l);
if (r < 0)
goto finish;
}
n_subtract = 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
break;
}
case _JSON_BUILD_OBJECT_BEGIN:
if (!IN_SET(current->expect, EXPECT_TOPLEVEL, EXPECT_OBJECT_VALUE, EXPECT_ARRAY_ELEMENT)) {
r = -EINVAL;
goto finish;
}
if (!GREEDY_REALLOC(stack, n_stack_allocated, n_stack+1)) {
r = -ENOMEM;
goto finish;
}
current = stack + n_stack - 1;
if (current->expect == EXPECT_TOPLEVEL)
current->expect = EXPECT_END;
else if (current->expect == EXPECT_OBJECT_VALUE)
current->expect = EXPECT_OBJECT_KEY;
else
assert(current->expect == EXPECT_ARRAY_ELEMENT);
stack[n_stack++] = (JsonStack) {
.expect = EXPECT_OBJECT_KEY,
.n_suppress = current->n_suppress != 0 ? (size_t) -1 : 0, /* if we shall suppress the
* new object, then we should
* also suppress all object
* members */
};
break;
case _JSON_BUILD_OBJECT_END:
if (current->expect != EXPECT_OBJECT_KEY) {
r = -EINVAL;
goto finish;
}
assert(n_stack > 1);
if (current->n_suppress == 0) {
r = json_variant_new_object(&add, current->elements, current->n_elements);
if (r < 0)
goto finish;
}
n_subtract = 1;
json_stack_release(current);
n_stack--, current--;
break;
case _JSON_BUILD_PAIR: {
const char *n;
if (current->expect != EXPECT_OBJECT_KEY) {
r = -EINVAL;
goto finish;
}
n = va_arg(ap, const char *);
if (current->n_suppress == 0) {
r = json_variant_new_string(&add, n);
if (r < 0)
goto finish;
}
n_subtract = 1;
current->expect = EXPECT_OBJECT_VALUE;
break;
}
case _JSON_BUILD_PAIR_CONDITION: {
const char *n;
bool b;
if (current->expect != EXPECT_OBJECT_KEY) {
r = -EINVAL;
goto finish;
}
b = va_arg(ap, int);
n = va_arg(ap, const char *);
if (b && current->n_suppress == 0) {
r = json_variant_new_string(&add, n);
if (r < 0)
goto finish;
}
n_subtract = 1; /* we generated one item */
if (!b && current->n_suppress != (size_t) -1)
current->n_suppress += 2; /* Suppress this one and the next item */
current->expect = EXPECT_OBJECT_VALUE;
break;
}}
/* If a variant was generated, add it to our current variant, but only if we are not supposed to suppress additions */
if (add && current->n_suppress == 0) {
if (!GREEDY_REALLOC(current->elements, current->n_elements_allocated, current->n_elements + 1)) {
r = -ENOMEM;
goto finish;
}
current->elements[current->n_elements++] = TAKE_PTR(add);
}
/* If we are supposed to suppress items, let's subtract how many items where generated from that
* counter. Except if the counter is (size_t) -1, i.e. we shall suppress an infinite number of elements
* on this stack level */
if (current->n_suppress != (size_t) -1) {
if (current->n_suppress <= n_subtract) /* Saturated */
current->n_suppress = 0;
else
current->n_suppress -= n_subtract;
}
}
done:
assert(n_stack == 1);
assert(stack[0].n_elements == 1);
*ret = json_variant_ref(stack[0].elements[0]);
r = 0;
finish:
for (i = 0; i < n_stack; i++)
json_stack_release(stack + i);
free(stack);
return r;
}
int json_build(JsonVariant **ret, ...) {
va_list ap;
int r;
va_start(ap, ret);
r = json_buildv(ret, ap);
va_end(ap);
return r;
}
int json_log_internal(
JsonVariant *variant,
int level,
int error,
const char *file,
int line,
const char *func,
const char *format, ...) {
PROTECT_ERRNO;
unsigned source_line, source_column;
char buffer[LINE_MAX];
const char *source;
va_list ap;
int r;
errno = ERRNO_VALUE(error);
va_start(ap, format);
(void) vsnprintf(buffer, sizeof buffer, format, ap);
va_end(ap);
if (variant) {
r = json_variant_get_source(variant, &source, &source_line, &source_column);
if (r < 0)
return r;
} else {
source = NULL;
source_line = 0;
source_column = 0;
}
if (source && source_line > 0 && source_column > 0)
return log_struct_internal(
LOG_REALM_PLUS_LEVEL(LOG_REALM_SYSTEMD, level),
error,
file, line, func,
"MESSAGE_ID=" SD_MESSAGE_INVALID_CONFIGURATION_STR,
"CONFIG_FILE=%s", source,
"CONFIG_LINE=%u", source_line,
"CONFIG_COLUMN=%u", source_column,
LOG_MESSAGE("%s:%u:%u: %s", source, source_line, source_column, buffer),
NULL);
else
return log_struct_internal(
LOG_REALM_PLUS_LEVEL(LOG_REALM_SYSTEMD, level),
error,
file, line, func,
"MESSAGE_ID=" SD_MESSAGE_INVALID_CONFIGURATION_STR,
LOG_MESSAGE("%s", buffer),
NULL);
}
int json_dispatch(JsonVariant *v, const JsonDispatch table[], JsonDispatchCallback bad, JsonDispatchFlags flags, void *userdata) {
const JsonDispatch *p;
size_t i, n, m;
int r, done = 0;
bool *found;
if (!json_variant_is_object(v)) {
json_log(v, flags, 0, "JSON variant is not an object.");
if (flags & JSON_PERMISSIVE)
return 0;
return -EINVAL;
}
for (p = table, m = 0; p->name; p++)
m++;
found = newa0(bool, m);
n = json_variant_elements(v);
for (i = 0; i < n; i += 2) {
JsonVariant *key, *value;
assert_se(key = json_variant_by_index(v, i));
assert_se(value = json_variant_by_index(v, i+1));
for (p = table; p->name; p++)
if (p->name == (const char*) -1 ||
streq_ptr(json_variant_string(key), p->name))
break;
if (p->name) { /* Found a matching entry! :-) */
JsonDispatchFlags merged_flags;
merged_flags = flags | p->flags;
if (p->type != _JSON_VARIANT_TYPE_INVALID &&
!json_variant_has_type(value, p->type)) {
json_log(value, merged_flags, 0,
"Object field '%s' has wrong type %s, expected %s.", json_variant_string(key),
json_variant_type_to_string(json_variant_type(value)), json_variant_type_to_string(p->type));
if (merged_flags & JSON_PERMISSIVE)
continue;
return -EINVAL;
}
if (found[p-table]) {
json_log(value, merged_flags, 0, "Duplicate object field '%s'.", json_variant_string(key));
if (merged_flags & JSON_PERMISSIVE)
continue;
return -ENOTUNIQ;
}
found[p-table] = true;
if (p->callback) {
r = p->callback(json_variant_string(key), value, merged_flags, (uint8_t*) userdata + p->offset);
if (r < 0) {
if (merged_flags & JSON_PERMISSIVE)
continue;
return r;
}
}
done ++;
} else { /* Didn't find a matching entry! :-( */
if (bad) {
r = bad(json_variant_string(key), value, flags, userdata);
if (r < 0) {
if (flags & JSON_PERMISSIVE)
continue;
return r;
} else
done ++;
} else {
json_log(value, flags, 0, "Unexpected object field '%s'.", json_variant_string(key));
if (flags & JSON_PERMISSIVE)
continue;
return -EADDRNOTAVAIL;
}
}
}
for (p = table; p->name; p++) {
JsonDispatchFlags merged_flags = p->flags | flags;
if ((merged_flags & JSON_MANDATORY) && !found[p-table]) {
json_log(v, merged_flags, 0, "Missing object field '%s'.", p->name);
if ((merged_flags & JSON_PERMISSIVE))
continue;
return -ENXIO;
}
}
return done;
}
int json_dispatch_boolean(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
bool *b = userdata;
assert(variant);
assert(b);
if (!json_variant_is_boolean(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a boolean.", strna(name));
*b = json_variant_boolean(variant);
return 0;
}
int json_dispatch_tristate(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
int *b = userdata;
assert(variant);
assert(b);
if (!json_variant_is_boolean(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a boolean.", strna(name));
*b = json_variant_boolean(variant);
return 0;
}
int json_dispatch_integer(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
intmax_t *i = userdata;
assert(variant);
assert(i);
if (!json_variant_is_integer(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name));
*i = json_variant_integer(variant);
return 0;
}
int json_dispatch_unsigned(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
uintmax_t *u = userdata;
assert(variant);
assert(u);
if (!json_variant_is_unsigned(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an unsigned integer.", strna(name));
*u = json_variant_unsigned(variant);
return 0;
}
int json_dispatch_uint32(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
uint32_t *u = userdata;
assert(variant);
assert(u);
if (!json_variant_is_unsigned(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an unsigned integer.", strna(name));
if (json_variant_unsigned(variant) > UINT32_MAX)
return json_log(variant, flags, SYNTHETIC_ERRNO(ERANGE), "JSON field '%s' out of bounds.", strna(name));
*u = (uint32_t) json_variant_unsigned(variant);
return 0;
}
int json_dispatch_int32(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
int32_t *i = userdata;
assert(variant);
assert(i);
if (!json_variant_is_integer(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name));
if (json_variant_integer(variant) < INT32_MIN || json_variant_integer(variant) > INT32_MAX)
return json_log(variant, flags, SYNTHETIC_ERRNO(ERANGE), "JSON field '%s' out of bounds.", strna(name));
*i = (int32_t) json_variant_integer(variant);
return 0;
}
int json_dispatch_string(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
char **s = userdata;
int r;
assert(variant);
assert(s);
if (json_variant_is_null(variant)) {
*s = mfree(*s);
return 0;
}
if (!json_variant_is_string(variant))
return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a string.", strna(name));
r = free_and_strdup(s, json_variant_string(variant));
if (r < 0)
return json_log(variant, flags, r, "Failed to allocate string: %m");
return 0;
}
int json_dispatch_strv(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
_cleanup_strv_free_ char **l = NULL;
char ***s = userdata;
size_t i;
int r;
assert(variant);
assert(s);
if (json_variant_is_null(variant)) {
*s = strv_free(*s);
return 0;
}
if (!json_variant_is_array(variant))
return json_log(variant, SYNTHETIC_ERRNO(EINVAL), flags, "JSON field '%s' is not an array.", strna(name));
for (i = 0; i < json_variant_elements(variant); i++) {
JsonVariant *e;
assert_se(e = json_variant_by_index(variant, i));
if (!json_variant_is_string(e))
return json_log(e, flags, SYNTHETIC_ERRNO(EINVAL), "JSON array element is not a string.");
r = strv_extend(&l, json_variant_string(e));
if (r < 0)
return json_log(variant, flags, r, "Failed to append array element: %m");
}
strv_free_and_replace(*s, l);
return 0;
}
int json_dispatch_variant(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
JsonVariant **p = userdata;
assert(variant);
assert(p);
json_variant_unref(*p);
*p = json_variant_ref(variant);
return 0;
}
static const char* const json_variant_type_table[_JSON_VARIANT_TYPE_MAX] = {
[JSON_VARIANT_STRING] = "string",
[JSON_VARIANT_INTEGER] = "integer",
[JSON_VARIANT_UNSIGNED] = "unsigned",
[JSON_VARIANT_REAL] = "real",
[JSON_VARIANT_NUMBER] = "number",
[JSON_VARIANT_BOOLEAN] = "boolean",
[JSON_VARIANT_ARRAY] = "array",
[JSON_VARIANT_OBJECT] = "object",
[JSON_VARIANT_NULL] = "null",
};
DEFINE_STRING_TABLE_LOOKUP(json_variant_type, JsonVariantType);
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