Adding upstream version 2.38.1.upstream/2.38.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 229 insertions, 0 deletions

diff --git a/lib/jsonwrt.c b/lib/jsonwrt.c
new file mode 100644
index 0000000..8ca1d4d
--- /dev/null
+++ b/lib/jsonwrt.c
@@ -0,0 +1,229 @@
+/*
+ * JSON output formatting functions.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <cctype.h>
+
+#include "c.h"
+#include "jsonwrt.h"
+
+/*
+ * Requirements enumerated via testing (V8, Firefox, IE11):
+ *
+ * var charsToEscape = [];
+ * for (var i = 0; i < 65535; i += 1) {
+ *	try {
+ *		JSON.parse('{"sample": "' + String.fromCodePoint(i) + '"}');
+ *	} catch (e) {
+ *		charsToEscape.push(i);
+ *	}
+ * }
+ */
+static void fputs_quoted_case_json(const char *data, FILE *out, int dir)
+{
+	const char *p;
+
+	fputc('"', out);
+	for (p = data; p && *p; p++) {
+
+		const unsigned int c = (unsigned int) *p;
+
+		/* From http://www.json.org
+		 *
+		 * The double-quote and backslashes would break out a string or
+		 * init an escape sequence if not escaped.
+		 *
+		 * Note that single-quotes and forward slashes, while they're
+		 * in the JSON spec, don't break double-quoted strings.
+		 */
+		if (c == '"' || c == '\\') {
+			fputc('\\', out);
+			fputc(c, out);
+			continue;
+		}
+
+		/* All non-control characters OK; do the case swap as required. */
+		if (c >= 0x20) {
+			/*
+			 * Don't use locale sensitive ctype.h functions for regular
+			 * ASCII chars, because for example with Turkish locale
+			 * (aka LANG=tr_TR.UTF-8) toupper('I') returns 'I'.
+			 */
+			if (c <= 127)
+				fputc(dir ==  1 ? c_toupper(c) :
+				      dir == -1 ? c_tolower(c) : *p, out);
+			else
+				fputc(dir ==  1 ? toupper(c) :
+				      dir == -1 ? tolower(c) : *p, out);
+			continue;
+		}
+
+		/* In addition, all chars under ' ' break Node's/V8/Chrome's, and
+		 * Firefox's JSON.parse function
+		 */
+		switch (c) {
+			/* Handle short-hand cases to reduce output size.  C
+			 * has most of the same stuff here, so if there's an
+			 * "Escape for C" function somewhere in the STL, we
+			 * should probably be using it.
+			 */
+			case '\b':
+				fputs("\\b", out);
+				break;
+			case '\t':
+				fputs("\\t", out);
+				break;
+			case '\n':
+				fputs("\\n", out);
+				break;
+			case '\f':
+				fputs("\\f", out);
+				break;
+			case '\r':
+				fputs("\\r", out);
+				break;
+			default:
+				/* Other assorted control characters */
+				fprintf(out, "\\u00%02x", c);
+				break;
+		}
+	}
+	fputc('"', out);
+}
+
+#define fputs_quoted_json(_d, _o)       fputs_quoted_case_json(_d, _o, 0)
+#define fputs_quoted_json_upper(_d, _o) fputs_quoted_case_json(_d, _o, 1)
+#define fputs_quoted_json_lower(_d, _o) fputs_quoted_case_json(_d, _o, -1)
+
+void ul_jsonwrt_init(struct ul_jsonwrt *fmt, FILE *out, int indent)
+{
+	fmt->out = out;
+	fmt->indent = indent;
+	fmt->after_close = 0;
+}
+
+int ul_jsonwrt_is_ready(struct ul_jsonwrt *fmt)
+{
+	return fmt->out == NULL ? 0 : 1;
+}
+
+void ul_jsonwrt_indent(struct ul_jsonwrt *fmt)
+{
+	int i;
+
+	for (i = 0; i < fmt->indent; i++)
+		fputs("   ", fmt->out);
+}
+
+void ul_jsonwrt_open(struct ul_jsonwrt *fmt, const char *name, int type)
+{
+	if (name) {
+		if (fmt->after_close)
+			fputs(",\n", fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs_quoted_json_lower(name, fmt->out);
+	} else {
+		if (fmt->after_close)
+			fputs(",", fmt->out);
+		else
+			ul_jsonwrt_indent(fmt);
+	}
+
+	switch (type) {
+	case UL_JSON_OBJECT:
+		fputs(name ? ": {\n" : "{\n", fmt->out);
+		fmt->indent++;
+		break;
+	case UL_JSON_ARRAY:
+		fputs(name ? ": [\n" : "[\n", fmt->out);
+		fmt->indent++;
+		break;
+	case UL_JSON_VALUE:
+		fputs(name ? ": " : " ", fmt->out);
+		break;
+	}
+	fmt->after_close = 0;
+}
+
+void ul_jsonwrt_close(struct ul_jsonwrt *fmt, int type)
+{
+	if (fmt->indent == 1) {
+		fputs("\n}\n", fmt->out);
+		fmt->indent--;
+		fmt->after_close = 1;
+		return;
+	}
+	assert(fmt->indent > 0);
+
+	switch (type) {
+	case UL_JSON_OBJECT:
+		fmt->indent--;
+		fputc('\n', fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs("}", fmt->out);
+		break;
+	case UL_JSON_ARRAY:
+		fmt->indent--;
+		fputc('\n', fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs("]", fmt->out);
+		break;
+	case UL_JSON_VALUE:
+		break;
+	}
+
+	fmt->after_close = 1;
+}
+
+void ul_jsonwrt_value_raw(struct ul_jsonwrt *fmt,
+			const char *name, const char *data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	if (data && *data)
+		fputs(data, fmt->out);
+	else
+		fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_s(struct ul_jsonwrt *fmt,
+			const char *name, const char *data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	if (data && *data)
+		fputs_quoted_json(data, fmt->out);
+	else
+		fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_u64(struct ul_jsonwrt *fmt,
+			const char *name, uint64_t data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fprintf(fmt->out, "%"PRIu64, data);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_boolean(struct ul_jsonwrt *fmt,
+			const char *name, int data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fputs(data ? "true" : "false", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_null(struct ul_jsonwrt *fmt,
+			const char *name)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}