From dd775090878854ccfe65310f9457ce3e393c070d Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Mon, 18 Aug 2025 03:59:02 +0200
Subject: Benchmark files

---
 test/benchmarks/search-rabin-karp.c | 81 +++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 test/benchmarks/search-rabin-karp.c

(limited to 'test/benchmarks/search-rabin-karp.c')

diff --git a/test/benchmarks/search-rabin-karp.c b/test/benchmarks/search-rabin-karp.c
new file mode 100644
index 0000000..d9860ee
--- /dev/null
+++ b/test/benchmarks/search-rabin-karp.c
@@ -0,0 +1,81 @@
+struct result_buf {
+	unsigned long array[24*1024*1024];
+	int len;
+};
+
+struct result_buf rbuf;
+
+int read(int fd, void *buf, unsigned long len);
+void *malloc(unsigned long);
+long strlen(char *);
+int open(char *, int flags, long mode);
+int printf(char *, ...);
+void exit(int);
+int strncmp(char *, char *, unsigned long);
+
+void rabin_karp(char *p, int plen, char *t, int tlen)
+{
+	unsigned long d = 129;
+	unsigned long h = 1, p_h = 0, t_h = 0;
+	int i;
+	for (i = 0; i < plen - 1; ++i)
+		h = (h * d);
+
+	for (i = 0; i < plen; ++i) {
+		p_h = (d*p_h + p[i]);
+		t_h = (d*t_h + t[i]);
+	}
+
+
+	for (i = 0; i <= tlen - plen; ++i) {
+
+		if (p_h == t_h && strncmp(t + i, p, plen) == 0) {
+			rbuf.array[rbuf.len] = i;
+			++rbuf.len;
+		}
+		if (i < tlen - plen) {
+			t_h = (d*(t_h - t[i]*h)) + t[i + plen];
+		}
+	}
+}
+
+void *read_file(int fd, int *len)
+{
+	int size = 1500 * 1024 * 1024;
+	unsigned char *arr = malloc(size);
+	int i;
+	for (i = 0; ;) {
+		int rd = read(fd, arr + i, size - i);
+		if (rd < 0)
+			exit(2);
+		if (rd == 0)
+			break;
+		i += rd;
+	}
+
+	*len = i;
+	return arr;
+}
+
+int main(int argc, char **argv)
+{
+	int i, slen;
+	long sum = 0;
+	int fd;
+	char *buf;
+	char *needle = argv[2];
+
+	fd = open(argv[1], 0, 0);
+	if (fd == -1)
+		return 1;
+	buf = read_file(fd, &slen);
+	printf("len: %d\n", slen);
+
+	rabin_karp(needle, strlen(needle), buf, slen);
+
+	for (i = 0; i < rbuf.len; ++i)
+		sum += rbuf.array[i];
+	printf("%ld\n", sum);
+
+	return 0;
+}
-- 
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