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/* $OpenBSD: json.c,v 1.5 2023/04/26 19:14:54 claudio Exp $ */
/*
* Copyright (c) 2020 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "json.h"
#define JSON_MAX_STACK 16
enum json_type {
NONE,
START,
ARRAY,
OBJECT
};
static struct json_stack {
const char *name;
unsigned int count;
enum json_type type;
} stack[JSON_MAX_STACK];
static char indent[JSON_MAX_STACK + 1];
static int level;
static FILE *jsonfh;
static void
do_comma_indent(void)
{
if (stack[level].count++ > 0)
fprintf(jsonfh, ",\n");
fprintf(jsonfh, "\t%.*s", level, indent);
}
static void
do_name(const char *name)
{
if (stack[level].type == ARRAY)
return;
fprintf(jsonfh, "\"%s\": ", name);
}
static int
do_find(enum json_type type, const char *name)
{
int i;
for (i = level; i > 0; i--)
if (type == stack[i].type &&
strcmp(name, stack[i].name) == 0)
return i;
/* not found */
return -1;
}
void
json_do_start(FILE *fh)
{
memset(indent, '\t', JSON_MAX_STACK);
memset(stack, 0, sizeof(stack));
level = 0;
stack[level].type = START;
jsonfh = fh;
fprintf(jsonfh, "{\n");
}
void
json_do_finish(void)
{
while (level > 0)
json_do_end();
fprintf(jsonfh, "\n}\n");
}
void
json_do_array(const char *name)
{
int i, l;
if ((l = do_find(ARRAY, name)) > 0) {
/* array already in use, close element and move on */
for (i = level - l; i > 0; i--)
json_do_end();
return;
}
/* Do not stack arrays, while allowed this is not needed */
if (stack[level].type == ARRAY)
json_do_end();
do_comma_indent();
do_name(name);
fprintf(jsonfh, "[\n");
if (++level >= JSON_MAX_STACK)
errx(1, "json stack too deep");
stack[level].name = name;
stack[level].type = ARRAY;
stack[level].count = 0;
}
void
json_do_object(const char *name)
{
int i, l;
if ((l = do_find(OBJECT, name)) > 0) {
/* roll back to that object and close it */
for (i = level - l; i >= 0; i--)
json_do_end();
}
do_comma_indent();
do_name(name);
fprintf(jsonfh, "{\n");
if (++level >= JSON_MAX_STACK)
errx(1, "json stack too deep");
stack[level].name = name;
stack[level].type = OBJECT;
stack[level].count = 0;
}
void
json_do_end(void)
{
if (stack[level].type == ARRAY)
fprintf(jsonfh, "\n%.*s]", level, indent);
else if (stack[level].type == OBJECT)
fprintf(jsonfh, "\n%.*s}", level, indent);
else
errx(1, "json bad stack state");
stack[level].name = NULL;
stack[level].type = NONE;
stack[level].count = 0;
if (level-- <= 0)
errx(1, "json stack underflow");
stack[level].count++;
}
void
json_do_printf(const char *name, const char *fmt, ...)
{
va_list ap;
do_comma_indent();
do_name(name);
fprintf(jsonfh, "\"");
va_start(ap, fmt);
vfprintf(jsonfh, fmt, ap);
va_end(ap);
fprintf(jsonfh, "\"");
}
void
json_do_hexdump(const char *name, void *buf, size_t len)
{
uint8_t *data = buf;
size_t i;
do_comma_indent();
do_name(name);
fprintf(jsonfh, "\"");
for (i = 0; i < len; i++)
fprintf(jsonfh, "%02x", *(data + i));
fprintf(jsonfh, "\"");
}
void
json_do_bool(const char *name, int v)
{
do_comma_indent();
do_name(name);
if (v)
fprintf(jsonfh, "true");
else
fprintf(jsonfh, "false");
}
void
json_do_uint(const char *name, unsigned long long v)
{
do_comma_indent();
do_name(name);
fprintf(jsonfh, "%llu", v);
}
void
json_do_int(const char *name, long long v)
{
do_comma_indent();
do_name(name);
fprintf(jsonfh, "%lld", v);
}
void
json_do_double(const char *name, double v)
{
do_comma_indent();
do_name(name);
fprintf(jsonfh, "%f", v);
}
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