posting old shit
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kore_json_construct.c
Normal file
238
kore_json_construct.c
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#include <PublicDomain.txt>
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// Simple function I wrote to make my life easier while playing with Kore C web server
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//
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// Should be easily portable to not use any json libraries at all if you really wanna to
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//
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// I know that it uses ?: GCC extension but in this file it can be expanded to standard C ternary operator with simple
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// sed expression, everything for your closed-source "can't add useful features to my compiler" needs :)
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//
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// Usage:
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// N-th variadic argument starts new context with one of the json types
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// N+1 sets the name of object if current context is not an array, can be NULL
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// N+2 sets the object value
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// N+M marks the end with JSON_END flag if the context was object or array
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//
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// Example:
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// root = json_construct( NULL,
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// JSON_TYPE_OBJECT, NULL,
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// JSON_TYPE_STRING, "version", "2.1",
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// JSON_TYPE_OBJECT, "software",
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// JSON_TYPE_STRING, "name", "apserv",
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// JSON_TYPE_STRING, "version", "0.0.1",
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// JSON_TYPE_STRING, "repository", "https://git.mentality.rip/FWGS/apserv",
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// JSON_TYPE_STRING, "homepage", "https://git.mentality.rip/FWGS/apserv",
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// JSON_END,
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// JSON_TYPE_ARRAY, "protocols",
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// JSON_TYPE_STRING, "activitypub",
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// JSON_END,
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// JSON_TYPE_OBJECT, "services",
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// JSON_TYPE_ARRAY, "inbound", JSON_END,
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// JSON_TYPE_ARRAY, "outbound", JSON_END,
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// JSON_END,
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// JSON_TYPE_LITERAL, "openRegistrations", APSERV_OPEN_REGISTRATIONS ? JSON_TRUE : JSON_FALSE,
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// JSON_TYPE_OBJECT, "usage",
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// JSON_TYPE_OBJECT, "users",
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// JSON_TYPE_U64, "total", 0,
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// JSON_TYPE_U64, "activeHalfyear", 0,
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// JSON_TYPE_U64, "activeMonth", 0,
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// JSON_END,
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// JSON_END,
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// JSON_TYPE_OBJECT, "metadata",
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// JSON_END,
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// JSON_END);
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//
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// This generates an object below:
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// {
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// "version": "2.1",
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// "software": {
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// "name": "apserv",
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// "version": "0.0.1",
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// "repository": "https://git.mentality.rip/FWGS/apserv",
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// "homepage": "https://git.mentality.rip/FWGS/apserv"
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// },
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// "protocols": [
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// "activitypub"
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// ],
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// "services": {
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// "inbound": [],
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// "outbound": []
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// },
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// "openRegistrations": false,
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// "usage": {
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// "users": {
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// "total": 0,
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// "activeHalfyear": 0,
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// "activeMonth": 0
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// }
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// },
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// "metadata": {}
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// }
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//
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#include <stdarg.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <kore/kore.h>
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#define JSON_END 0
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#define JSON_TYPE_OBJECT KORE_JSON_TYPE_OBJECT
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#define JSON_TYPE_ARRAY KORE_JSON_TYPE_ARRAY
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#define JSON_TYPE_STRING KORE_JSON_TYPE_STRING
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#define JSON_TYPE_NUMBER KORE_JSON_TYPE_NUMBER
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#define JSON_TYPE_LITERAL KORE_JSON_TYPE_LITERAL
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#define JSON_TYPE_I32 (1U<<31)
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#define JSON_TYPE_U32 (1U<<30)
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#define JSON_TYPE_I64 KORE_JSON_TYPE_INTEGER
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#define JSON_TYPE_U64 KORE_JSON_TYPE_INTEGER_U64
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#define JSON_FALSE KORE_JSON_FALSE
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#define JSON_TRUE KORE_JSON_TRUE
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#define JSON_NULL KORE_JSON_NULL
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struct kore_json_item *json_construct( struct kore_json_item *parent, int type, ... );
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#define JSON_CONSTRUCT_DEBUG
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#ifdef JSON_CONSTRUCT_DEBUG
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#define CONSTRUCT_DEBUG(...) kore_log( LOG_DEBUG, __VA_ARGS__ )
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#else
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#define CONSTRUCT_DEBUG(...)
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#endif
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static struct kore_json_item *json_construct_onev( struct kore_json_item *parent, bool skipname, int type, va_list ap )
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{
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struct kore_json_item *ret = NULL;
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const char *name, *parent_name;
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if( type == JSON_END )
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{
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fatal( "%s: this shouldn't happen", __func__ );
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return NULL;
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}
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if( parent )
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{
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if( parent->name )
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parent_name = parent->name;
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else parent_name = "(noname)";
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}
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else parent_name = "(noparent)";
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if( !skipname )
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name = va_arg( ap, const char * );
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else name = NULL;
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if( type == JSON_TYPE_OBJECT || type == JSON_TYPE_ARRAY )
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{
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const char *strtype = type == JSON_TYPE_OBJECT ? "object" : "array";
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struct kore_json_item *f;
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f = kore_json_create_item( parent, name, type );
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if( !ret ) ret = f;
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CONSTRUCT_DEBUG( "(%s) creating %s \"%s\"", parent_name, strtype, name ?: "" );
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for( ;; )
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{
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int nexttype = va_arg( ap, int );
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if( nexttype == JSON_END )
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{
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CONSTRUCT_DEBUG( "(%s) closing %s \"%s\"", parent_name, strtype, name ?: "" );
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return ret;
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}
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json_construct_onev( f, type == JSON_TYPE_ARRAY, nexttype, ap );
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}
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}
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switch( type )
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{
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case JSON_TYPE_STRING:
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{
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const char *szValue = va_arg( ap, const char * );
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CONSTRUCT_DEBUG( "(%s) creating string object \"%s\": \"%s\"", parent_name, name ?: "", szValue );
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ret = kore_json_create_string( parent, name, szValue );
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break;
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}
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case JSON_TYPE_NUMBER:
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{
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double flValue = va_arg( ap, double );
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CONSTRUCT_DEBUG( "(%s) creating number parameter \"%s\": %f", parent_name, name ?: "", flValue );
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ret = kore_json_create_number( parent, name, flValue );
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break;
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}
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case JSON_TYPE_LITERAL:
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{
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int32_t iValue = va_arg( ap, int );
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const char *szValue;
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switch( iValue )
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{
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case JSON_FALSE: szValue = "false"; break;
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case JSON_TRUE: szValue = "true"; break;
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case JSON_NULL: szValue = "null"; break;
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default: fatal("illegal value %d for literal type", iValue );
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}
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CONSTRUCT_DEBUG( "(%s) creating literal parameter \"%s\": %s", parent_name, name ?: "", szValue );
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ret = kore_json_create_literal( parent, name, iValue );
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break;
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}
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case JSON_TYPE_I32:
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{
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int32_t iValue = va_arg( ap, int32_t );
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CONSTRUCT_DEBUG( "(%s) creating int32 parameter \"%s\": %d", parent_name, name ?: "", iValue );
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ret = kore_json_create_integer( parent, name, iValue );
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break;
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}
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case JSON_TYPE_U32:
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{
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uint32_t uValue = va_arg( ap, uint32_t );
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CONSTRUCT_DEBUG( "(%s) creating uint32 parameter \"%s\": %u", parent_name, name ?: "", uValue );
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ret = kore_json_create_integer( parent, name, uValue );
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break;
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}
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case JSON_TYPE_I64:
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{
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int64_t lValue = va_arg( ap, int64_t );
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CONSTRUCT_DEBUG( "(%s) creating int64 parameter \"%s\": " PRId64, parent_name, name ?: "", lValue );
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ret = kore_json_create_integer( parent, name, lValue );
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break;
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}
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case JSON_TYPE_U64:
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{
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uint64_t ulValue = va_arg( ap, uint64_t );
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CONSTRUCT_DEBUG( "(%s) creating uint64 parameter \"%s\": " PRIu64, parent_name, name ?: "", ulValue );
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ret = kore_json_create_integer_u64( parent, name, ulValue );
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break;
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}
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}
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return ret;
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}
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struct kore_json_item *json_construct( struct kore_json_item *parent, int type, ... )
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{
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va_list ap;
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va_start( ap, type );
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parent = json_construct_onev( parent, type == JSON_TYPE_ARRAY, type, ap );
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va_end( ap );
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return parent;
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}
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