numtools

commit 8c9298b2b8694b8b32fa5c182299a6eab7706ebc
parent 932c3cef20eeebc528abd5e545959f8c04f305a0
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Tue,  3 May 2022 15:13:40 +0200

begin implementing randnum

Diffstat:
A
randnum.c
 | 
71
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 71 insertions(+), 0 deletions(-)
diff --git a/randnum.c b/randnum.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <err.h>
+#include <limits.h>
+#include <string.h>
+#include <math.h>
+
+#include "arg.h"
+#include "util.h"
+
+char *argv0;
+
+static void
+usage(void)
+{
+	errx(1, "usage: %s [-f fmtstr] [-h] [-n num] [-s] "
+	        "val1 [val2 ...]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int i, ret, n = 1, N;
+	double val = 0.0, *weights = NULL;
+	char fmtstr[PATH_MAX] = "%g\n";
+
+	if (pledge("stdio", NULL) == -1)
+		err(2, "pledge");
+
+	ARGBEGIN {
+	case 'f':
+		ret = snprintf(fmtstr, sizeof(fmtstr), "%s", EARGF(usage()));
+		if (ret < 0 || (size_t)ret >= sizeof(fmtstr))
+			errx(1, "%s: could not write fmtstr", __func__);
+		break;
+	case 'h':
+		usage();
+		break;
+	case 'n':
+		n = atoi(EARGF(usage()));
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc < 1)
+		usage();
+
+	N = argc;
+	if (!(weights = calloc(N, sizeof(double))))
+		err(1, "calloc");
+
+	for (i = 0; i < N; i++) {
+		weights[i] = atof(argv[i]);
+		if (weights[i] <= 0.0)
+			errx(1, "weight %d is not positive (%g)", i, weights[i]);
+		if (weights[i] > 1.0)
+			errx(1, "weight %d is greater than 1 (%g)", i, weights[i]);
+	}
+	val = 0.0;
+	for (i = 0; i < N; i++)
+		val += weights[i];
+	if (fabs(val - 1.0) > 1e-3)
+		errx(1, "weights do not sum to 1 (%g)", val);
+
+
+
+	free(weights);
+
+	return 0;
+}