IABSD.fr/src/usr.sbin/bgpctl/json.c

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• Author : claudio
  Date : 2020-05-04 16:00:13
  Hash : df3045ca
  Message : Using int64_t together with printf %llu is not portable. Either add a cast in the printf to unsigned long long or just use unsigned long long from the start. In this case it is better to switch the type. Similar changes had been done before. OK deraadt@

• usr.sbin/bgpctl/json.c

• /*
   * 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
  };
  
  struct json_stack {
  	const char	*name;
  	unsigned int	count;
  	enum json_type	type;
  } stack[JSON_MAX_STACK];
  
  char indent[JSON_MAX_STACK + 1];
  int level;
  
  static void
  do_comma_indent(void)
  {
  	if (stack[level].count++ > 0)
  		printf(",\n");
  	printf("\t%.*s", level, indent);
  }
  
  static void
  do_name(const char *name)
  {
  	if (stack[level].type == ARRAY)
  		return;
  	printf("\"%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(void)
  {
  	memset(indent, '\t', JSON_MAX_STACK);
  	memset(stack, 0, sizeof(stack));
  	level = 0;
  	stack[level].type = START;
  
  	printf("{\n");
  }
  
  void
  json_do_finish(void)
  {
  	while (level > 0)
  		json_do_end();
  	printf("\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);
  	printf("[\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);
  	printf("{\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)
  		printf("\n%.*s]", level, indent);
  	else if (stack[level].type == OBJECT)
  		printf("\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);
  	printf("\"");
  	va_start(ap, fmt);
  	vprintf(fmt, ap);
  	va_end(ap);
  	printf("\"");
  }
  
  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);
  	printf("\"");
  	for (i=0; i < len; i++)
  		printf("%02x", *(data+i));
  	printf("\"");
  }
  
  void
  json_do_bool(const char *name, int v)
  {
  	do_comma_indent();
  	do_name(name);
  	if (v)
  		printf("true");
  	else
  		printf("false");
  }
  
  void
  json_do_uint(const char *name, unsigned long long v)
  {
  	do_comma_indent();
  	do_name(name);
  	printf("%llu", v);
  }
  
  void
  json_do_int(const char *name, long long v)
  {
  	do_comma_indent();
  	do_name(name);
  	printf("%lld", v);
  }
  
  void
  json_do_double(const char *name, double v)
  {
  	do_comma_indent();
  	do_name(name);
  	printf("%f", v);
  }