pangram (C)

c/pangram/src/pangram.c

@@ -0,0 +1,41 @@
+#include "pangram.h"
+#include <ctype.h>
+/* See GNUmakefile in following link for explanation
+ * https://exercism.io/my/solutions/103b2f7d92db42309c1988030f5202c7
+ */
+#if defined UNIT_TEST || defined DEBUG
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+bool is_pangram(const char *sentence)
+{
+    char result['z'-'a'+1]= { 0 }, c;
+    /* count is used to avoid parsing whole string: we stop when all
+     * letters found
+     */
+    int count=0;
+
+    if (sentence) {
+        for (; *sentence && count<26; ++sentence) {
+            if (isalpha(*sentence)) {
+                c=tolower(*sentence);
+                if (!result[c-'a']) {
+                    result[c-'a']=1;
+                    count++;
+                }
+            }
+        }
+    }
+    return count==26;
+}
+
+#ifdef UNIT_TEST
+int main(int ac, char **av)
+{
+    int arg=1;
+    for (; arg<ac; ++arg) {
+        printf("pangram(%s)=%d\n", av[arg], is_pangram(av[arg]));
+    }
+}
+#endif

c/pangram/src/pangram.h

@@ -0,0 +1,17 @@
+#ifndef PANGRAM_H
+#define PANGRAM_H
+
+#include <stdbool.h>
+
+bool is_pangram(const char *sentence);
+
+
+/* See GNUmakefile in following link for explanation
+ * https://exercism.io/my/solutions/103b2f7d92db42309c1988030f5202c7
+ */
+#ifdef  TESTALL
+#undef  TEST_IGNORE
+#define TEST_IGNORE() {}
+#endif
+
+#endif