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	optimize printing the index of an array with the -n option - json2tsv - JSON to…
	git clone git://git.codemadness.org/json2tsv
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	---
	commit 7c6507b10767029b3d4585e3e65d231f66fa904b
	parent 18215ba6f1a9f2c76ffceded0670eb2b2f466792
	Author: Hiltjo Posthuma <[email protected]>
	Date: Fri, 24 Sep 2021 14:27:38 +0200

	optimize printing the index of an array with the -n option

	Diffstat:
	M json2tsv.c \| 35 +++++++++++++++++++++++++----…

	1 file changed, 29 insertions(+), 6 deletions(-)
	---
	diff --git a/json2tsv.c b/json2tsv.c
	@@ -1,5 +1,7 @@
	#include <ctype.h>
	#include <errno.h>
	+#include <limits.h>
	+#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	@@ -48,6 +50,29 @@ rs_printvalue(const char *s)
	}
	}

	+/* optimized printing an unsigned number (compared to printf("%zu"); */
	+void
	+printnum(uintmax_t x)
	+{
	+ char buf[64], s, e;
	+ unsigned long y;
	+
	+ if (!x) {
	+ putchar('0');
	+ return;
	+ }
	+
	+ s = e = buf + sizeof(buf) - 1;
	+
	+ for (; x > ULONG_MAX; x /= 10)
	+ *--s = '0' + x % 10;
	+ for (y = x; y; y /= 10)
	+ *--s = '0' + y % 10;
	+
	+ for (; s < e; s++)
	+ putchar(*s);
	+}
	+
	void
	processnode(struct json_node nodes, size_t depth, const char value)
	{
	@@ -64,12 +89,10 @@ processnode(struct json_node *nodes, size_t depth, const ch…
	if (nodes[i].type == JSON_TYPE_OBJECT) {
	putchar('.');
	} else if (nodes[i].type == JSON_TYPE_ARRAY) {
	- if (nflag) {
	- printf("[%zu]", nodes[i].index);
	- } else {
	- putchar('[');
	- putchar(']');
	- }
	+ putchar('[');
	+ if (nflag)
	+ printnum(nodes[i].index);
	+ putchar(']');
	}
	}