json-c-0.6.tar.gz_JSON_json linux

/* * $Id: json_object.c,v 1.15 2006/01/30 23:07:57 mclark Exp $ * * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd. * Michael Clark <michael@metaparadigm.com> * * This library is free software; you can redistribute it and/or modify * it under the terms of the MIT license. See COPYING for details. * */ #include "config.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include "debug.h" #include "printbuf.h" #include "linkhash.h" #include "arraylist.h" #include "json_object.h" #include "json_object_private.h" #include "json_tokener.h" #if !HAVE_STRNDUP char* strndup(const char* str, size_t n); #endif /* !HAVE_STRNDUP */ /* #define REFCOUNT_DEBUG 1 */ char *json_number_chars = "0123456789.+-e"; char *json_hex_chars = "0123456789abcdef"; #ifdef REFCOUNT_DEBUG static char* json_type_name[] = { "null", "boolean", "double", "int", "object", "array", "string", }; #endif /* REFCOUNT_DEBUG */ static void json_object_generic_delete(struct json_object* this); static struct json_object* json_object_new(enum json_type o_type); /* ref count debugging */ #ifdef REFCOUNT_DEBUG static struct lh_table *json_object_table; static void json_object_init() __attribute__ ((constructor)); static void json_object_init() { mc_debug("json_object_init: creating object table\n"); json_object_table = lh_kptr_table_new(128, "json_object_table", NULL); } static void json_object_fini() __attribute__ ((destructor)); static void json_object_fini() { struct lh_entry *ent; if(mc_get_debug() && json_object_table->count) { mc_debug("json_object_fini: %d referenced objects at exit\n", json_object_table->count); lh_foreach(json_object_table, ent) { struct json_object* obj = (struct json_object*)ent->v; mc_debug("\t%s:%p\n", json_type_name[obj->o_type], obj); } } mc_debug("json_object_fini: freeing object table\n"); lh_table_free(json_object_table); } #endif /* REFCOUNT_DEBUG */ /* string escaping */ static int json_escape_str(struct printbuf *pb, char *str) { int pos = 0, start_offset = 0; unsigned char c; do { c = str[pos]; switch(c) { case '\0': break; case '\b': case '\n': case '\r': case '\t': case '"': if(pos - start_offset > 0) printbuf_memappend(pb, str + start_offset, pos - start_offset); if(c == '\b') printbuf_memappend(pb, "\\b", 2); else if(c == '\n') printbuf_memappend(pb, "\\n", 2); else if(c == '\r') printbuf_memappend(pb, "\\r", 2); else if(c == '\t') printbuf_memappend(pb, "\\t", 2); else if(c == '"') printbuf_memappend(pb, "\\\"", 2); start_offset = ++pos; break; default: if(c < ' ') { if(pos - start_offset > 0) printbuf_memappend(pb, str + start_offset, pos - start_offset); sprintbuf(pb, "\\u00%c%c", json_hex_chars[c >> 4], json_hex_chars[c & 0xf]); start_offset = ++pos; } else pos++; } } while(c); if(pos - start_offset > 0) printbuf_memappend(pb, str + start_offset, pos - start_offset); return 0; } /* reference counting */ extern struct json_object* json_object_get(struct json_object *this) { if(this) { this->_ref_count++; } return this; } extern void json_object_put(struct json_object *this) { if(this) { this->_ref_count--; if(!this->_ref_count) this->_delete(this); } } /* generic object construction and destruction parts */ static void json_object_generic_delete(struct json_object* this) { #ifdef REFCOUNT_DEBUG mc_debug("json_object_delete_%s: %p\n", json_type_name[this->o_type], this); lh_table_delete(json_object_table, this); #endif /* REFCOUNT_DEBUG */ printbuf_free(this->_pb); free(this); } static struct json_object* json_object_new(enum json_type o_type) { struct json_object *this = calloc(sizeof(struct json_object), 1); if(!this) return NULL; this->o_type = o_type; this->_ref_count = 1; this->_delete = &json_object_generic_delete; #ifdef REFCOUNT_DEBUG lh_table_insert(json_object_table, this, this); mc_debug("json_object_new_%s: %p\n", json_type_name[this->o_type], this); #endif /* REFCOUNT_DEBUG */ return this; } /* type checking functions */ int json_object_is_type(struct json_object *this, enum json_type type) { return (this->o_type == type); } enum json_type json_object_get_type(struct json_object *this) { return this->o_type; } /* json_object_to_json_string */ char* json_object_to_json_string(struct json_object *this) { if(!this) return "null"; if(!this->_pb) { if(!(this->_pb = printbuf_new())) return NULL; } else { printbuf_reset(this->_pb); } if(this->_to_json_string(this, this->_pb) < 0) return NULL; return this->_pb->buf; } /* json_object_object */ static int json_object_object_to_json_string(struct json_object* this, struct printbuf *pb) { int i=0; struct json_object_iter iter; sprintbuf(pb, "{"); /* CAW: scope operator to make ANSI correctness */ /* CAW: switched to json_object_object_foreachC which uses an iterator struct */ json_object_object_foreachC(this, iter) { if(i) sprintbuf(pb, ","); sprintbuf(pb, " \""); json_escape_str(pb, iter.key); sprintbuf(pb, "\": "); if(iter.val == NULL) sprintbuf(pb, "null"); else iter.val->_to_json_string(iter.val, pb); i++; } return sprintbuf(pb, " }"); } static void json_object_lh_entry_free(struct lh_entry *ent) { free(ent->k); json_object_put((struct json_object*)ent->v); } static void json_object_object_delete(struct json_object* this) { lh_table_free(this->o.c_object); json_object_generic_delete(this); } struct json_object* json_object_new_object() { struct json_object *this = json_object_new(json_type_object); if(!this) return NULL; this->_delete = &json_object_object_delete; this->_to_json_string = &json_object_object_to_json_string; this->o.c_object = lh_kchar_table_new(JSON_OBJECT_DEF_HASH_ENTIRES, NULL, &json_object_lh_entry_free); return this; } struct lh_table* json_object_get_object(struct json_object *this) { if(!this) return NULL; switch(this->o_type) { case json_type_object: return this->o.c_object; default: return NULL; } } void json_object_object_add(struct json_object* this, char *key, struct json_object *val) { lh_table_delete(this->o.c_object, key); lh_table_insert(this->o.c_object, strdup(key), val); } struct json_object* json_object_object_get(struct json_object* this, char *key) { return (struct json_object*) lh_table_lookup(this->o.c_object, key); } void json_object_object_del(struct json_object* this, char *key) { lh_table_delete(this->o.c_object, key); } /* json_object_boolean */ static int json_object_boolean_to_json_string(struct json_object* this, struct printbuf *pb) { if(this->o.c_boolean) return sprintbuf(pb, "true"); else return sprintbuf(pb, "false"); } struct json_object* json_object_new_boolean(boolean b) { struct json_object *this = json_object_new(json_type_boolean); if(!this) return NULL; this->_to_json_string = &json_object_boolean_to_json_string; this->o.c_boolean = b; return this; } boolean json_object_get_boolean(struct json_object *this) { if(!this) return FALSE; switch(this->o_type) { case json_type_boolean: return this->o.c_boolean; case json_type_int: return (this->o.c_int != 0); case json_type_double: return (this->o.c_double != 0); case json_type_string: if(strlen(this->o.c_string)) return TRUE; default: return TRUE; } } /* json_object_int */ static int json_object_int_to_json_string(struct json_object* this, struct printbuf *pb) { return sprintbuf(pb, "%d", this->o.c_int); } struct json_object* json_object_new_int(int i) { struct json_object *this = json_object_new(json_type_int); if(!this) return NULL; this->_to_json_string = &json_object_int_to_json_string; this->o.c_int = i; return this; } int json_object_get_int(struct json_object *this) { in