From e798e1bb80b8e6ca4ef71dc6ccdea3a40a7da1d1 Mon Sep 17 00:00:00 2001
From: Don Cross <cosinekitty@gmail.com>
Date: Tue, 21 May 2019 10:17:59 -0400
Subject: [PATCH] Work in progress: C moon phase unit test.

---
 generate/ctest.c     | 66 ++++++++++++++++++++++++++++++++++++++++++--
 generate/unit_test_c |  1 +
 2 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/generate/ctest.c b/generate/ctest.c
index 45bcffb8..1720ad92 100644
--- a/generate/ctest.c
+++ b/generate/ctest.c
@@ -42,6 +42,7 @@ static int AstroCheck(void);
 static int Diff(const char *c_filename, const char *js_filename);
 static int DiffLine(int lnum, const char *cline, const char *jline, double *maxdiff, int *worst_lnum);
 static int SeasonsTest(const char *filename);
+static int MoonPhase(const char *filename);
 
 int main(int argc, const char *argv[])
 {
@@ -56,12 +57,20 @@ int main(int argc, const char *argv[])
 
     if (argc == 3)
     {
-        if (!strcmp(argv[1], "seasons"))
+        const char *verb = argv[1];
+        const char *filename = argv[2];
+
+        if (!strcmp(verb, "seasons"))
         {
-            const char *filename = argv[2];
             CHECK(SeasonsTest(filename));
             goto success;
         }
+
+        if (!strcmp(verb, "moonphase"))
+        {
+            CHECK(MoonPhase(filename));
+            goto success;
+        }
     }
 
     if (argc == 4)
@@ -479,3 +488,56 @@ fail:
 }
 
 /*-----------------------------------------------------------------------------------------------------------*/
+
+static int MoonPhase(const char *filename)
+{
+    int error = 1;
+    FILE *infile = NULL;
+    int lnum, nscanned;
+    int quarter, year, month, day, hour, minute;
+    double second;
+    char line[200];    
+
+    infile = fopen(filename, "rt");
+    if (infile == NULL)
+    {
+        fprintf(stderr, "MoonPhase: Cannot open input file '%s'\n", filename);
+        error = 1;
+        goto fail;
+    }
+
+    /*
+        0 1800-01-25T03:21:00.000Z
+        1 1800-02-01T20:40:00.000Z
+        2 1800-02-09T17:26:00.000Z
+        3 1800-02-16T15:49:00.000Z
+    */
+    lnum = 0;
+    while (fgets(line, sizeof(line), infile))
+    {
+        ++lnum;
+        nscanned = sscanf(line, "%d %d-%d-%dT%d:%d:%lfZ", &quarter, &year, &month, &day, &hour, &minute, &second);
+        if (nscanned != 7)
+        {
+            fprintf(stderr, "MoonPhase(%s line %d): Invalid data format\n", filename, lnum);
+            error = 1;
+            goto fail;
+        }
+
+        if (quarter < 0 || quarter > 3)
+        {
+            fprintf(stderr, "MoonPhase(%s line %d): Invalid quarter %d\n", filename, lnum, quarter);
+            error = 1;
+            goto fail;
+        }
+    }
+
+    printf("MoonPhase: passed %d lines for file %s\n", lnum, filename);
+    error = 0;
+
+fail:
+    if (infile != NULL) fclose(infile);
+    return error;
+}
+
+/*-----------------------------------------------------------------------------------------------------------*/
diff --git a/generate/unit_test_c b/generate/unit_test_c
index 9640bc1b..75688534 100755
--- a/generate/unit_test_c
+++ b/generate/unit_test_c
@@ -24,6 +24,7 @@ echo "$0: Built 'ctest' program."
 ./generate check temp/c_check.txt || Fail "Verification failure for C unit test output."
 ./ctest diff temp/c_check.txt temp/js_check.txt || Fail "Diff(C,JS) failure."
 ./ctest seasons seasons/seasons.txt || Fail "Failed C seasons test."
+./ctest moonphase moonphase/moonphases.txt || Fail "Failed C moon phase test."
 
 echo "unit_test_c: success"
 exit 0