+/*
+ * Copyright (c) 2009-2011 Petri Lehtinen <petri@digip.org>
+ *
+ * Jansson is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
+#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
-#include <unistd.h>
#include <assert.h>
#include <jansson.h>
#include "strbuffer.h"
#include "utf.h"
+#define STREAM_STATE_OK 0
+#define STREAM_STATE_EOF -1
+#define STREAM_STATE_ERROR -2
+
#define TOKEN_INVALID -1
#define TOKEN_EOF 0
#define TOKEN_STRING 256
#define TOKEN_FALSE 260
#define TOKEN_NULL 261
-/* read one byte from stream, return EOF on end of file */
+/* Read one byte from stream, convert to unsigned char, then int, and
+ return. return EOF on end of file. This corresponds to the
+ behaviour of fgetc(). */
typedef int (*get_func)(void *data);
-/* return non-zero if end of file has been reached */
-typedef int (*eof_func)(void *data);
-
typedef struct {
get_func get;
- eof_func eof;
void *data;
- int stream_pos;
char buffer[5];
int buffer_pos;
+ int state;
+ int line;
+ int column, last_column;
+ size_t position;
} stream_t;
-
typedef struct {
stream_t stream;
strbuffer_t saved_text;
int token;
- int line, column;
union {
char *string;
- int integer;
+ json_int_t integer;
double real;
} value;
} lex_t;
+#define stream_to_lex(stream) container_of(stream, lex_t, stream)
-/*** error reporting ***/
-static void error_init(json_error_t *error)
-{
- if(error)
- {
- error->text[0] = '\0';
- error->line = -1;
- }
-}
+/*** error reporting ***/
static void error_set(json_error_t *error, const lex_t *lex,
const char *msg, ...)
{
va_list ap;
- char text[JSON_ERROR_TEXT_LENGTH];
+ char msg_text[JSON_ERROR_TEXT_LENGTH];
+
+ int line = -1, col = -1;
+ size_t pos = 0;
+ const char *result = msg_text;
- if(!error || error->text[0] != '\0') {
- /* error already set */
+ if(!error)
return;
- }
va_start(ap, msg);
- vsnprintf(text, JSON_ERROR_TEXT_LENGTH, msg, ap);
+ vsnprintf(msg_text, JSON_ERROR_TEXT_LENGTH, msg, ap);
va_end(ap);
if(lex)
{
const char *saved_text = strbuffer_value(&lex->saved_text);
- error->line = lex->line;
+ char msg_with_context[JSON_ERROR_TEXT_LENGTH];
+
+ line = lex->stream.line;
+ col = lex->stream.column;
+ pos = lex->stream.position;
+
if(saved_text && saved_text[0])
{
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
- "%s near '%s'", text, saved_text);
+ if(lex->saved_text.length <= 20) {
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near '%s'", msg_text, saved_text);
+ result = msg_with_context;
+ }
}
else
{
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH,
- "%s near end of file", text);
+ if(lex->stream.state == STREAM_STATE_ERROR) {
+ /* No context for UTF-8 decoding errors */
+ result = msg_text;
+ }
+ else {
+ snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
+ "%s near end of file", msg_text);
+ result = msg_with_context;
+ }
}
}
- else
- {
- error->line = -1;
- snprintf(error->text, JSON_ERROR_TEXT_LENGTH, "%s", text);
- }
+
+ jsonp_error_set(error, line, col, pos, "%s", result);
}
/*** lexical analyzer ***/
-void stream_init(stream_t *stream, get_func get, eof_func eof, void *data)
+static void
+stream_init(stream_t *stream, get_func get, void *data)
{
stream->get = get;
- stream->eof = eof;
stream->data = data;
- stream->stream_pos = 0;
stream->buffer[0] = '\0';
stream->buffer_pos = 0;
+
+ stream->state = STREAM_STATE_OK;
+ stream->line = 1;
+ stream->column = 0;
+ stream->position = 0;
}
-static char stream_get(stream_t *stream, json_error_t *error)
+static int stream_get(stream_t *stream, json_error_t *error)
{
- char c;
+ int c;
+
+ if(stream->state != STREAM_STATE_OK)
+ return stream->state;
if(!stream->buffer[stream->buffer_pos])
{
- stream->buffer[0] = stream->get(stream->data);
- stream->buffer_pos = 0;
-
- c = stream->buffer[0];
+ c = stream->get(stream->data);
+ if(c == EOF) {
+ stream->state = STREAM_STATE_EOF;
+ return STREAM_STATE_EOF;
+ }
- if(c == EOF && stream->eof(stream->data))
- return EOF;
+ stream->buffer[0] = c;
+ stream->buffer_pos = 0;
- if(c < 0)
+ if(0x80 <= c && c <= 0xFF)
{
/* multi-byte UTF-8 sequence */
int i, count;
for(i = 1; i < count; i++)
stream->buffer[i] = stream->get(stream->data);
- if(!utf8_check_full(stream->buffer, count))
+ if(!utf8_check_full(stream->buffer, count, NULL))
goto out;
- stream->stream_pos += count;
stream->buffer[count] = '\0';
}
- else {
+ else
stream->buffer[1] = '\0';
- stream->stream_pos++;
- }
}
- return (char)stream->buffer[stream->buffer_pos++];
+ c = stream->buffer[stream->buffer_pos++];
+
+ stream->position++;
+ if(c == '\n') {
+ stream->line++;
+ stream->last_column = stream->column;
+ stream->column = 0;
+ }
+ else if(utf8_check_first(c)) {
+ /* track the Unicode character column, so increment only if
+ this is the first character of a UTF-8 sequence */
+ stream->column++;
+ }
+
+ return c;
out:
- error_set(error, NULL, "unable to decode byte 0x%x at position %d",
- (unsigned char)c, stream->stream_pos);
- return EOF;
+ stream->state = STREAM_STATE_ERROR;
+ error_set(error, stream_to_lex(stream), "unable to decode byte 0x%x", c);
+ return STREAM_STATE_ERROR;
}
-static void stream_unget(stream_t *stream, char c)
+static void stream_unget(stream_t *stream, int c)
{
+ if(c == STREAM_STATE_EOF || c == STREAM_STATE_ERROR)
+ return;
+
+ stream->position--;
+ if(c == '\n') {
+ stream->line--;
+ stream->column = stream->last_column;
+ }
+ else if(utf8_check_first(c))
+ stream->column--;
+
assert(stream->buffer_pos > 0);
stream->buffer_pos--;
- assert(stream->buffer[stream->buffer_pos] == (unsigned char)c);
+ assert(stream->buffer[stream->buffer_pos] == c);
}
return stream_get(&lex->stream, error);
}
-static int lex_eof(lex_t *lex)
-{
- return lex->stream.eof(lex->stream.data);
-}
-
-static void lex_save(lex_t *lex, char c)
+static void lex_save(lex_t *lex, int c)
{
strbuffer_append_byte(&lex->saved_text, c);
}
static int lex_get_save(lex_t *lex, json_error_t *error)
{
- char c = stream_get(&lex->stream, error);
- lex_save(lex, c);
+ int c = stream_get(&lex->stream, error);
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR)
+ lex_save(lex, c);
return c;
}
-static void lex_unget_unsave(lex_t *lex, char c)
+static void lex_unget(lex_t *lex, int c)
+{
+ stream_unget(&lex->stream, c);
+}
+
+static void lex_unget_unsave(lex_t *lex, int c)
{
- char d;
- if(c != EOF)
+ if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR) {
+ char d;
stream_unget(&lex->stream, c);
- d = strbuffer_pop(&lex->saved_text);
- assert(c == d);
+ d = strbuffer_pop(&lex->saved_text);
+ assert(c == d);
+ }
}
static void lex_save_cached(lex_t *lex)
{
lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
lex->stream.buffer_pos++;
+ lex->stream.position++;
+ }
+}
+
+/* assumes that str points to 'u' plus at least 4 valid hex digits */
+static int32_t decode_unicode_escape(const char *str)
+{
+ int i;
+ int32_t value = 0;
+
+ assert(str[0] == 'u');
+
+ for(i = 1; i <= 4; i++) {
+ char c = str[i];
+ value <<= 4;
+ if(isdigit(c))
+ value += c - '0';
+ else if(islower(c))
+ value += c - 'a' + 10;
+ else if(isupper(c))
+ value += c - 'A' + 10;
+ else
+ assert(0);
}
+
+ return value;
}
static void lex_scan_string(lex_t *lex, json_error_t *error)
{
- char c;
+ int c;
const char *p;
char *t;
+ int i;
+ lex->value.string = NULL;
lex->token = TOKEN_INVALID;
- /* skip the " */
c = lex_get_save(lex, error);
while(c != '"') {
- if(c == EOF) {
- if(lex_eof(lex))
- error_set(error, lex, "premature end of input");
+ if(c == STREAM_STATE_ERROR)
+ goto out;
+
+ else if(c == STREAM_STATE_EOF) {
+ error_set(error, lex, "premature end of input");
goto out;
}
c = lex_get_save(lex, error);
if(c == 'u') {
c = lex_get_save(lex, error);
- for(int i = 0; i < 4; i++) {
+ for(i = 0; i < 4; i++) {
if(!isxdigit(c)) {
- lex_unget_unsave(lex, c);
error_set(error, lex, "invalid escape");
goto out;
}
c == 'f' || c == 'n' || c == 'r' || c == 't')
c = lex_get_save(lex, error);
else {
- lex_unget_unsave(lex, c);
error_set(error, lex, "invalid escape");
goto out;
}
- two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
are converted to 4 bytes
*/
- lex->value.string = malloc(lex->saved_text.length + 1);
+ lex->value.string = jsonp_malloc(lex->saved_text.length + 1);
if(!lex->value.string) {
/* this is not very nice, since TOKEN_INVALID is returned */
goto out;
if(*p == '\\') {
p++;
if(*p == 'u') {
- /* TODO */
- error_set(error, lex, "\\u escapes are not yet supported");
- free(lex->value.string);
- lex->value.string = NULL;
- goto out;
- } else {
+ char buffer[4];
+ int length;
+ int32_t value;
+
+ value = decode_unicode_escape(p);
+ p += 5;
+
+ if(0xD800 <= value && value <= 0xDBFF) {
+ /* surrogate pair */
+ if(*p == '\\' && *(p + 1) == 'u') {
+ int32_t value2 = decode_unicode_escape(++p);
+ p += 5;
+
+ if(0xDC00 <= value2 && value2 <= 0xDFFF) {
+ /* valid second surrogate */
+ value =
+ ((value - 0xD800) << 10) +
+ (value2 - 0xDC00) +
+ 0x10000;
+ }
+ else {
+ /* invalid second surrogate */
+ error_set(error, lex,
+ "invalid Unicode '\\u%04X\\u%04X'",
+ value, value2);
+ goto out;
+ }
+ }
+ else {
+ /* no second surrogate */
+ error_set(error, lex, "invalid Unicode '\\u%04X'",
+ value);
+ goto out;
+ }
+ }
+ else if(0xDC00 <= value && value <= 0xDFFF) {
+ error_set(error, lex, "invalid Unicode '\\u%04X'", value);
+ goto out;
+ }
+ else if(value == 0)
+ {
+ error_set(error, lex, "\\u0000 is not allowed");
+ goto out;
+ }
+
+ if(utf8_encode(value, buffer, &length))
+ assert(0);
+
+ memcpy(t, buffer, length);
+ t += length;
+ }
+ else {
switch(*p) {
case '"': case '\\': case '/':
*t = *p; break;
case 't': *t = '\t'; break;
default: assert(0);
}
+ t++;
+ p++;
}
}
else
- *t = *p;
-
- t++;
- p++;
+ *(t++) = *(p++);
}
*t = '\0';
lex->token = TOKEN_STRING;
+ return;
out:
- return;
+ jsonp_free(lex->value.string);
}
-static void lex_scan_number(lex_t *lex, char c, json_error_t *error)
+#if JSON_INTEGER_IS_LONG_LONG
+#define json_strtoint strtoll
+#else
+#define json_strtoint strtol
+#endif
+
+static int lex_scan_number(lex_t *lex, int c, json_error_t *error)
{
const char *saved_text;
char *end;
+ double value;
lex->token = TOKEN_INVALID;
goto out;
}
}
- else /* c != '0' */ {
+ else if(isdigit(c)) {
c = lex_get_save(lex, error);
while(isdigit(c))
c = lex_get_save(lex, error);
}
+ else {
+ lex_unget_unsave(lex, c);
+ goto out;
+ }
if(c != '.' && c != 'E' && c != 'e') {
+ json_int_t value;
+
lex_unget_unsave(lex, c);
- lex->token = TOKEN_INTEGER;
saved_text = strbuffer_value(&lex->saved_text);
- lex->value.integer = strtol(saved_text, &end, 10);
+
+ errno = 0;
+ value = json_strtoint(saved_text, &end, 10);
+ if(errno == ERANGE) {
+ if(value < 0)
+ error_set(error, lex, "too big negative integer");
+ else
+ error_set(error, lex, "too big integer");
+ goto out;
+ }
+
assert(end == saved_text + lex->saved_text.length);
- return;
+ lex->token = TOKEN_INTEGER;
+ lex->value.integer = value;
+ return 0;
}
if(c == '.') {
c = lex_get(lex, error);
- if(!isdigit(c))
+ if(!isdigit(c)) {
+ lex_unget(lex, c);
goto out;
+ }
lex_save(lex, c);
c = lex_get_save(lex, error);
}
lex_unget_unsave(lex, c);
- lex->token = TOKEN_REAL;
saved_text = strbuffer_value(&lex->saved_text);
- lex->value.real = strtod(saved_text, &end);
+ value = strtod(saved_text, &end);
assert(end == saved_text + lex->saved_text.length);
+ if(errno == ERANGE && value != 0) {
+ error_set(error, lex, "real number overflow");
+ goto out;
+ }
+
+ lex->token = TOKEN_REAL;
+ lex->value.real = value;
+ return 0;
+
out:
- return;
+ return -1;
}
static int lex_scan(lex_t *lex, json_error_t *error)
{
- char c;
+ int c;
strbuffer_clear(&lex->saved_text);
if(lex->token == TOKEN_STRING) {
- free(lex->value.string);
- lex->value.string = NULL;
+ jsonp_free(lex->value.string);
+ lex->value.string = NULL;
}
c = lex_get(lex, error);
while(c == ' ' || c == '\t' || c == '\n' || c == '\r')
- {
- if(c == '\n')
- lex->line++;
-
c = lex_get(lex, error);
+
+ if(c == STREAM_STATE_EOF) {
+ lex->token = TOKEN_EOF;
+ goto out;
}
- if(c == EOF) {
- if(lex_eof(lex))
- lex->token = TOKEN_EOF;
- else
- lex->token = TOKEN_INVALID;
+ if(c == STREAM_STATE_ERROR) {
+ lex->token = TOKEN_INVALID;
goto out;
}
else if(c == '"')
lex_scan_string(lex, error);
- else if(isdigit(c) || c == '-')
- lex_scan_number(lex, c, error);
+ else if(isdigit(c) || c == '-') {
+ if(lex_scan_number(lex, c, error))
+ goto out;
+ }
else if(isupper(c) || islower(c)) {
/* eat up the whole identifier for clearer error messages */
return lex->token;
}
-static int lex_init(lex_t *lex, get_func get, eof_func eof, void *data)
+static char *lex_steal_string(lex_t *lex)
{
- stream_init(&lex->stream, get, eof, data);
+ char *result = NULL;
+ if(lex->token == TOKEN_STRING)
+ {
+ result = lex->value.string;
+ lex->value.string = NULL;
+ }
+ return result;
+}
+
+static int lex_init(lex_t *lex, get_func get, void *data)
+{
+ stream_init(&lex->stream, get, data);
if(strbuffer_init(&lex->saved_text))
return -1;
lex->token = TOKEN_INVALID;
- lex->line = 1;
-
return 0;
}
static void lex_close(lex_t *lex)
{
if(lex->token == TOKEN_STRING)
- free(lex->value.string);
+ jsonp_free(lex->value.string);
+ strbuffer_close(&lex->saved_text);
}
goto error;
}
- key = strdup(lex->value.string);
+ key = lex_steal_string(lex);
if(!key)
return NULL;
lex_scan(lex, error);
if(lex->token != ':') {
- free(key);
+ jsonp_free(key);
error_set(error, lex, "':' expected");
goto error;
}
lex_scan(lex, error);
value = parse_value(lex, error);
if(!value) {
- free(key);
+ jsonp_free(key);
goto error;
}
if(json_object_set_nocheck(object, key, value)) {
- free(key);
+ jsonp_free(key);
json_decref(value);
goto error;
}
json_decref(value);
- free(key);
+ jsonp_free(key);
lex_scan(lex, error);
if(lex->token != ',')
break;
case '{':
- json = parse_object(lex, error);
+ json = parse_object(lex, error);
break;
case '[':
return json;
}
-json_t *parse_json(lex_t *lex, json_error_t *error)
+static json_t *parse_json(lex_t *lex, json_error_t *error)
{
- error_init(error);
-
lex_scan(lex, error);
if(lex->token != '[' && lex->token != '{') {
error_set(error, lex, "'[' or '{' expected");
return parse_value(lex, error);
}
-json_t *json_load(const char *path, json_error_t *error)
-{
- json_t *result;
- FILE *fp;
-
- fp = fopen(path, "r");
- if(!fp)
- {
- error_set(error, NULL, "unable to open %s: %s",
- path, strerror(errno));
- return NULL;
- }
-
- result = json_loadf(fp, error);
-
- fclose(fp);
- return result;
-}
-
typedef struct
{
const char *data;
{
char c;
string_data_t *stream = (string_data_t *)data;
- c = stream->data[stream->pos++];
+ c = stream->data[stream->pos];
if(c == '\0')
return EOF;
else
- return c;
-}
-
-static int string_eof(void *data)
-{
- string_data_t *stream = (string_data_t *)data;
- return (stream->data[stream->pos] == '\0');
+ {
+ stream->pos++;
+ return (unsigned char)c;
+ }
}
-json_t *json_loads(const char *string, json_error_t *error)
+json_t *json_loads(const char *string, size_t flags, json_error_t *error)
{
lex_t lex;
json_t *result;
+ string_data_t stream_data = {string, 0};
- string_data_t stream_data = {
- .data = string,
- .pos = 0
- };
+ (void)flags; /* unused */
- if(lex_init(&lex, string_get, string_eof, (void *)&stream_data))
+ if(lex_init(&lex, string_get, (void *)&stream_data))
return NULL;
+ jsonp_error_init(error, "<string>");
+
result = parse_json(&lex, error);
if(!result)
goto out;
return result;
}
-json_t *json_loadf(FILE *input, json_error_t *error)
+json_t *json_loadf(FILE *input, size_t flags, json_error_t *error)
{
lex_t lex;
+ const char *source;
json_t *result;
+ (void)flags; /* unused */
- if(lex_init(&lex, (get_func)fgetc, (eof_func)feof, input))
+ if(lex_init(&lex, (get_func)fgetc, input))
return NULL;
+ if(input == stdin)
+ source = "<stdin>";
+ else
+ source = "<stream>";
+
+ jsonp_error_init(error, source);
+
result = parse_json(&lex, error);
+ if(!result)
+ goto out;
+ lex_scan(&lex, error);
+ if(lex.token != TOKEN_EOF) {
+ error_set(error, &lex, "end of file expected");
+ json_decref(result);
+ result = NULL;
+ }
+
+out:
lex_close(&lex);
return result;
}
+
+json_t *json_load_file(const char *path, size_t flags, json_error_t *error)
+{
+ json_t *result;
+ FILE *fp;
+
+ jsonp_error_init(error, path);
+
+ fp = fopen(path, "r");
+ if(!fp)
+ {
+ error_set(error, NULL, "unable to open %s: %s",
+ path, strerror(errno));
+ return NULL;
+ }
+
+ result = json_loadf(fp, flags, error);
+
+ fclose(fp);
+ return result;
+}
projects / jansson.git / blobdiff