KJSON_PUTINT(3) Library Functions Manual KJSON_PUTINT(3)

kjson_putint, kjson_putintp, kjson_putintstr, kjson_putintstrp, kjson_string_putint
put integer content for kcgijson

library “libkcgijson”

#include <sys/types.h>
#include <stdarg.h>
#include <stdint.h>
#include <kcgi.h>
#include <kcgijson.h>

enum kcgi_err
kjson_putint(struct kjsonreq *req, int64_t v);

enum kcgi_err
kjson_putintp(struct kjsonreq *req, const char *name, int64_t v);

enum kcgi_err
kjson_string_putint(struct kjsonreq *req, int64_t v);

enum kcgi_err
kjson_putintstr(struct kjsonreq *r, int64_t v);

enum kcgi_err
kjson_putintstrp(struct kjsonreq *r, const char *name, int64_t v);

Write a 64-bit integer v to a context req initialised with khtml_open(3). This formats the value as [-]?[0-9]+.

The kjson_putint() and kjson_putintstr() forms are for array scopes, kjson_putintp() and kjson_putintstrp() for objects, and kjson_string_putint() for open strings.

Since JavaScript is limited to 53 bits, it's possible that integers may be truncated with kjson_putint() and family. The alternative forms, kjson_putintstr() and kjson_putintstrp(), emit the value within a string. This allows the JavaScript to parse the integer and handle overflow and underflow explicitly.

Passing a NULL value to name for kjson_putintp() or kjson_putintstrp() is equivalent to calling kjson_putint() or kjson_putintstr(), respectively.

Returns an enum kcgi_err indicating the error state.
Success (not an error).
Internal memory allocation failure.
The output connection has been terminated. For FastCGI connections, the current connection should be released with khttp_free(3) and parse loop reentered.
The connection is still expecting headers with khttp_head(3). Indicates that khttp_body(3) did not return with success or was not invoked. For FastCGI connections, the current connection should be released with khttp_free(3) and parse loop reentered.
Internal system error writing to the output stream.
The incorrect form was used for the current scope, for example, an array-type write within an object.

The following outputs a simple JSON document. It assumes r is a struct kreq pointer. For brevity, it does not do any error checking.
khttp_head(r, kresps[KRESP_STATUS],
  "%s", khttps[KHTTP_200]);
khttp_head(r, kresps[KRESP_CONTENT_TYPE],
  "%s", kmimetypes[KMIME_APP_JSON]);
khttp_body(r);
kjson_open(&req, r);
kjson_obj_open(&req);
kjson_putintp(&req, "bar", 12345);
kjson_arrayp_open(&req, "baz");
kjson_putint(&req, 1)); /* 1 */
kjson_putintstr(&req, 1)); /* "1" */
kjson_close(&req);

kcgijson(3)

Written by Kristaps Dzonsons <kristaps@bsd.lv>.
March 27, 2020 OpenBSD 6.5