shithub: moonfish

--- a/README.md

+++ b/README.md

@@ -188,9 +188,16 @@

 porting moonfish

---

-The only piece of functionality the moonfish depends on that is not specified entirely in C89 is `clock_gettime`.

+Porting moonfish to a different platform should be a matter of simply providing a “mostly C89‐compliant”. Of course, moonfish doesn’t make use of *all* C89 features, so it is not necessary to have features that it doesn’t use. [Compiling on 9front](#compiling-on-9front), for example, works through NPE, which provides something close enough to C89 for moonfish to work.

-Porting moonfish to a different platform should be a matter of simply providing a “mostly C89‐compliant” environment alongside `clock_gettime`. Of course, moonfish doesn’t make use of *all* C89 features, so it is not necessary to have features that it doesn’t use. [Compiling on 9front](#compiling-on-9front), for example, works through NPE, which provides something close enough to C89 for moonfish to work.

+The only pieces of functionality that moonfish optionally depends on that is not specified entirely in C89 are `clock_gettime` and threads. For threads, either pthreads or C11 `<threads.h>` may be used. For `clock_gettime`, it is possible to use `time` instead. These can be configured with the following compile-time macros.

+- default (without explicit options): use `clock_gettime` and C11 `<threads.h>`

+- `-Dmoonfish_pthreads`: use pthreads instead of C11 `<threads.h>`

+- `-Dmoonfish_no_threads`: disable threads altogether

+- `-Dmoonfish_no_clock`: use `time` instead of `clock_gettime` (note: this is highly discouraged because 1 second time granularity is very detrimental in fast games, besides unfortunate reliance on wall-clock time.)

+Thus, moonfish can be compiled within a strict C89 implementation by setting the `moonfish_no_threads` and `moonfish_no_clock` macros during compile time.

 license

---

--- a/search.c

+++ b/search.c

@@ -18,7 +18,7 @@

 #ifdef _WIN32

-static long int moonfish_clock(void)

+static unsigned long int moonfish_clock(void)

 	return GetTickCount();

@@ -25,20 +25,34 @@

 #else

-static long int moonfish_clock(void)

+#ifdef moonfish_no_clock

+static unsigned long int moonfish_clock(void)

+	time_t t;

+	if (time(&t) < 0) {

+		perror("time");

+		exit(1);

+	}

+	return t * 1000;

+}

+#else

+static unsigned long int moonfish_clock(void)

+{

 	struct timespec ts;

 	if (clock_gettime(CLOCK_MONOTONIC, &ts)) {

 		perror("clock_gettime");

 		exit(1);

 	return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;

 #endif

+#endif

 struct moonfish_node {

 	struct moonfish_node *parent;

 	struct moonfish_node *children;

@@ -58,7 +72,7 @@

 struct moonfish_data {

 	struct moonfish_root *root;

-	long int time, time0;

+	unsigned long int time, time0;

 	long int node_count;

};

@@ -346,9 +360,10 @@

 #endif

 	time = LONG_MAX;

+	if (options->our_time >= 0) time = options->our_time / 16;

 	if (options->max_time >= 0 && time > options->max_time) time = options->max_time;

-	if (options->our_time >= 0 && time > options->our_time / 16) time = options->our_time / 16;

 	time -= time / 32 + 125;

+	if (time < 0) time = 0;

 	data.root = root;

 	data.time = time;

--

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