lib/jsonwrt: add new functions to write in JSON
We need JSON formatting stuff also outside libsmartcols. Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -26,6 +26,7 @@ dist_noinst_HEADERS += \
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include/idcache.h \
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include/ismounted.h \
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include/iso9660.h \
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include/jsonwrt.h \
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include/pwdutils.h \
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include/linux_version.h \
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include/list.h \
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@ -0,0 +1,44 @@
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#ifndef UTIL_LINUX_JSONWRT_H
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#define UTIL_LINUX_JSONWRT_H
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enum {
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UL_JSON_OBJECT,
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UL_JSON_ARRAY,
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UL_JSON_VALUE
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};
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struct ul_jsonwrt {
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FILE *out;
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int indent;
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unsigned int postponed_break :1;
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};
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void ul_jsonwrt_init(struct ul_jsonwrt *fmt, FILE *out, int indent);
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void ul_jsonwrt_indent(struct ul_jsonwrt *fmt);
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void ul_jsonwrt_open(struct ul_jsonwrt *fmt, const char *name, int type);
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void ul_jsonwrt_close(struct ul_jsonwrt *fmt, int type, int islast);
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#define ul_jsonwrt_root_open(_f) ul_jsonwrt_open(_f, NULL, UL_JSON_OBJECT)
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#define ul_jsonwrt_root_close(_f) ul_jsonwrt_close(_f, UL_JSON_OBJECT, 1)
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#define ul_jsonwrt_array_open(_f, _n) ul_jsonwrt_open(_f, _n, UL_JSON_ARRAY)
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#define ul_jsonwrt_array_close(_f, _l) ul_jsonwrt_close(_f, UL_JSON_ARRAY, _l)
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#define ul_jsonwrt_object_open(_f, _n) ul_jsonwrt_open(_f, _n, UL_JSON_OBJECT)
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#define ul_jsonwrt_object_close(_f, _l) ul_jsonwrt_close(_f, UL_JSON_OBJECT, _l)
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#define ul_jsonwrt_value_open(_f, _n) ul_jsonwrt_open(_f, _n, UL_JSON_VALUE)
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#define ul_jsonwrt_value_close(_f, _l) ul_jsonwrt_close(_f, UL_JSON_VALUE, _l)
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void ul_jsonwrt_value_raw(struct ul_jsonwrt *fmt,
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const char *name, const char *data, int islast);
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void ul_jsonwrt_value_s(struct ul_jsonwrt *fmt,
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const char *name, const char *data, int islast);
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void ul_jsonwrt_value_u64(struct ul_jsonwrt *fmt,
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const char *name, uint64_t data, int islast);
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void ul_jsonwrt_value_boolean(struct ul_jsonwrt *fmt,
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const char *name, int data, int islast);
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#endif /* UTIL_LINUX_JSONWRT_H */
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@ -22,6 +22,7 @@ libcommon_la_SOURCES = \
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lib/encode.c \
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lib/fileutils.c \
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lib/color-names.c \
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lib/jsonwrt.c \
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lib/mangle.c \
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lib/match.c \
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lib/mbsalign.c \
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@ -0,0 +1,128 @@
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/*
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* JSON output formatting functions.
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*
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* No copyright is claimed. This code is in the public domain; do with
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* it what you wish.
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*
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* Written by Karel Zak <kzak@redhat.com>
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include "c.h"
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#include "carefulputc.h"
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#include "jsonwrt.h"
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void ul_jsonwrt_init(struct ul_jsonwrt *fmt, FILE *out, int indent)
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{
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fmt->out = out;
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fmt->indent = indent;
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}
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void ul_jsonwrt_indent(struct ul_jsonwrt *fmt)
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{
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int i;
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for (i = 0; i < fmt->indent; i++)
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fputs(" ", fmt->out);
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}
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void ul_jsonwrt_open(struct ul_jsonwrt *fmt, const char *name, int type)
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{
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if (fmt->postponed_break && !name)
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;
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else {
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ul_jsonwrt_indent(fmt);
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if (name)
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fputs_quoted(name, fmt->out);
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}
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switch (type) {
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case UL_JSON_OBJECT:
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fputs(name ? ": {\n" : "{\n", fmt->out);
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fmt->indent++;
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break;
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case UL_JSON_ARRAY:
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fputs(name ? ": [\n" : "{\n", fmt->out);
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fmt->indent++;
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break;
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case UL_JSON_VALUE:
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fputs(name ? ": " : " ", fmt->out);
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break;
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}
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fmt->postponed_break = 0;
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}
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void ul_jsonwrt_close(struct ul_jsonwrt *fmt, int type, int islast)
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{
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if (fmt->indent == 0) {
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fputs("}\n", fmt->out);
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fmt->indent--;
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return;
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}
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assert(fmt->indent > 0);
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switch (type) {
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case UL_JSON_OBJECT:
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fmt->indent--;
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ul_jsonwrt_indent(fmt);
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fputs(islast ? "}" : "},", fmt->out);
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break;
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case UL_JSON_ARRAY:
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fmt->indent--;
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ul_jsonwrt_indent(fmt);
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fputs(islast ? "]" : "],", fmt->out);
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break;
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case UL_JSON_VALUE:
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if (!islast)
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fputc(',', fmt->out);
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break;
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}
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if (!islast && (type == UL_JSON_OBJECT || type == UL_JSON_ARRAY))
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fmt->postponed_break = 1;
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else {
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fputc('\n', fmt->out);
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fmt->postponed_break = 0;
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}
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}
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void ul_jsonwrt_value_raw(struct ul_jsonwrt *fmt,
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const char *name, const char *data, int islast)
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{
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ul_jsonwrt_value_open(fmt, name);
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if (data && *data)
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fputs(data, fmt->out);
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else
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fputs("null", fmt->out);
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ul_jsonwrt_value_close(fmt, islast);
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}
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void ul_jsonwrt_value_s(struct ul_jsonwrt *fmt,
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const char *name, const char *data, int islast)
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{
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ul_jsonwrt_value_open(fmt, name);
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if (data && *data)
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fputs_quoted(data, fmt->out);
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else
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fputs("null", fmt->out);
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ul_jsonwrt_value_close(fmt, islast);
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}
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void ul_jsonwrt_value_u64(struct ul_jsonwrt *fmt,
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const char *name, uint64_t data, int islast)
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{
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ul_jsonwrt_value_open(fmt, name);
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fprintf(fmt->out, "%"PRIu64, data);
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ul_jsonwrt_value_close(fmt, islast);
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}
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void ul_jsonwrt_value_boolean(struct ul_jsonwrt *fmt,
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const char *name, int data, int islast)
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{
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ul_jsonwrt_value_open(fmt, name);
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fputs(data ? "true" : "false", fmt->out);
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ul_jsonwrt_value_close(fmt, islast);
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}
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