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	humanize a number for the scale - ploot - simple plotting tools
	git clone git://bitreich.org/ploot git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65…
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	---
	commit 04a8bcf172e92e0f70bc889b5181bc3cbdb8f381
	Author: Josuah Demangeon <[email protected]>
	Date: Fri, 2 Feb 2018 02:16:15 +0100

	humanize a number for the scale

	Diffstat:
	A .gitignore \| 2 ++
	A Makefile \| 4 ++++
	A plot \| 0
	A plot.c \| 37 +++++++++++++++++++++++++++++…

	4 files changed, 43 insertions(+), 0 deletions(-)
	---
	diff --git a/.gitignore b/.gitignore
	@@ -0,0 +1,2 @@
	+*.o
	+./plot
	diff --git a/Makefile b/Makefile
	@@ -0,0 +1,4 @@
	+CFLAGS = -Wall -Wextra -Werror -std=c89 -pedantic
	+
	+all: plot.o
	+ ${CC} -o plot plot.o
	diff --git a/plot b/plot
	Binary files differ.
	diff --git a/plot.c b/plot.c
	@@ -0,0 +1,37 @@
	+#include <stdio.h>
	+
	+#define ABS(x) ((x) < 0 ? -(x) : (x))
	+
	+/*
	+ * Set `str' to a human-readable form of `num' with always a width of 8
	+ * (including '\0' terminator).
	+ */
	+void
	+humanize(double num, char *str, size_t len)
	+{
	+ int exp;
	+ char *label = " kMGTE", fmt[] = "%+.?f%c";
	+
	+ for (exp = 0; ABS(num) > 1000; exp += 3)
	+ num /= 1000;
	+
	+ fmt[3] = (ABS(num) < 10) ? '3' : (ABS(num) < 100) ? '2' : '1';
	+ if (exp == 0) {
	+ fmt[5] = '\0';
	+ fmt[3]++;
	+ }
	+ snprintf(str, len, fmt, num, label[exp / 3]);
	+ if (num > 0)
	+ str[0] = ' ';
	+}
	+
	+int
	+main()
	+{
	+ char str[8];
	+
	+ humanize(-1 << 18, str, sizeof(str));
	+ printf("%s\n", str);
	+
	+ return 0;
	+}