utils

commit: 36500620827964b007ed258c3b4afb3d443b1aed
parent 0d8f00af117f6c66eb7501457fed6d56202d13bc
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Thu, 13 May 2021 22:26:12 +0200

bin/humanize.c: New util

Diffstat:
M
bin/Makefile
3
+++
M
bin/Makefile.config
2
+-
A
bin/humanize.c
66
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/bin/Makefile b/bin/Makefile
@@ -15,6 +15,9 @@ lolcat: lolcat.c Makefile
 xcd: xcd.c Makefile
 	$(CC) -std=c11 $(CFLAGS) -o $@ $< -lm $(LDFLAGS)
 
+humanize: humanize.c Makefile
+	$(CC) -std=c11 $(CFLAGS) `pkg-config --cflags libbsd-overlay` -o $@ $< `pkg-config --libs libbsd-overlay` $(LDFLAGS)
+
 install:
 	mkdir -p ${DESTDIR}${BINDIR}/
 	cp -p ${EXE} ${DESTDIR}${BINDIR}/
diff --git a/bin/Makefile.config b/bin/Makefile.config
@@ -1,2 +1,2 @@
-EXE = args basename date dirname echo lolcat mdate pwd range sizeof sname tty xcd
+EXE = args basename date dirname echo humanize lolcat mdate pwd range sizeof sname tty xcd
 MAN1 = basename.1 date.1 dirname.1 lolcat.1 sname.1
diff --git a/bin/humanize.c b/bin/humanize.c
@@ -0,0 +1,66 @@
+#define _DEFAULT_SOURCE
+// strtonum
+#define _OPENBSD_SOURCE
+// On non-BSDs use libbsd
+#include <err.h>    // errx,
+#include <errno.h>  // EINVAL, ERANGE
+#include <stdio.h>  // fprintf
+#include <stdlib.h> // humanize_number, strtonum
+#include <unistd.h> // opt*, getopt
+#include <limits.h> // LLONG_MIN, LLONG_MAX
+
+void
+usage()
+{
+	fprintf(stderr, "Usage: humanize [-bd] number");
+}
+
+int
+main(int argc, char *argv[])
+{
+	int c;
+	int flags = HN_DIVISOR_1000|HN_NOSPACE;
+
+	while((c = getopt(argc, argv, "d")) != -1)
+	{
+		switch(c)
+		{
+		case 'd': flags &= HN_DIVISOR_1000; break;
+		case 'b': flags &= ~HN_DIVISOR_1000; break;
+		case '?':
+			fprintf(stderr, "Error: Unrecognised option: '-%c'\n", optopt);
+			usage();
+			return 1;
+		}
+	}
+
+	for(; optind < argc; optind++)
+	{
+		const char *errstr    = NULL;
+		char buffer[6] = "-";
+
+		// 1024^(6+1) goes higher than long long; don't ask for the moon
+		long long n = strtonum(argv[optind], LLONG_MIN, LLONG_MAX, &errstr);
+		if(errstr)
+		{
+			errx(1, "strtonum: %s is %s", argv[optind], errstr);
+		}
+
+		int err = humanize_number(buffer, sizeof(buffer), n, "", HN_AUTOSCALE, flags);
+		if(err < 0)
+		{
+			switch(errno)
+			{
+			case EINVAL: fprintf(stderr, "Number carried an unknown suffix.\n"); return 1;
+			case ERANGE: fprintf(stderr, "Represents a number that does not fit in result.\n"); return 1;
+			default: errx(1, "humanize_number: %s is %s", argv[optind], errstr);
+			}
+		}
+
+		printf("%s ", buffer);
+	}
+
+	printf("\n");
+
+	return 0;
+}