Extract file extension: Difference between revisions

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@@ Line 248: / Line 248: @@
 =={{header|C}}==
+<lang C>#include <assert.h>
-{{update|C|The format of a suffix has been clarified, and the test-cases have been replaced with new ones.}}
-<lang C>
-#include <assert.h>
 #include <ctype.h>
 #include <string.h>
 #include <stdio.h>
-/* Returns a pointer to the extension of 'string'. If no extension is found,
+/* Returns a pointer to the extension of 'string'.
- * then returns a pointer to the null-terminator of 'string'. */
+ * If no extension is found, returns a pointer to the end of 'string'. */
 char* file_ext(const char *string)
 {
@@ Line 267: / Line 264: @@
     for (char *iter = ext + 1; *iter != '\0'; iter++) {
-        if (!isalnum(*iter))
+        if (!isalnum((unsigned char)*iter))
             return (char*) string + strlen(string);
     }
-    return ext + 1;
+    return ext;
 }
 int main(void)
 {
-    const char *strings[] = {
+    const char *testcases[][2] = {
-        "picture.jpg",
+        {"http://example.com/download.tar.gz", ".gz"},
-        "http://mywebsite.con/picture/image.png",
+        {"CharacterModel.3DS", ".3DS"},
-        "myuniquefile.longextension",
+        {".desktop", ".desktop"},
-        "IAmAFileWithoutExtension",
+        {"document", ""},
-        "/path/to.my/file",
+        {"document.txt_backup", ""},
-        "file.odd_one"
+        {"/etc/pam.d/login", ""}
     };
+    int exitcode = 0;
-    for (int i = 0; i < sizeof(strings) / sizeof(strings[0]); ++i) {
+    for (size_t i = 0; i < sizeof(testcases) / sizeof(testcases[0]); i++) {
-        printf("'%s' - '%s'\n", strings[i], file_ext(strings[i]));
+        const char *ext = file_ext(testcases[i][0]);
+        if (strcmp(ext, testcases[i][1]) != 0) {
+            fprintf(stderr, "expected '%s' for '%s', got '%s'\n",
+                testcases[i][1], testcases[i][0], ext);
+            exitcode = 1;
+        }
     }
+    return exitcode;
-}
-</lang>
+}</lang>
-{{out}}
-<pre>
-'picture.jpg' - 'jpg'
-'http://mywebsite.con/picture/image.png' - 'png'
-'myuniquefile.longextension' - 'longextension'
-'IAmAFileWithoutExtension' - ''
-'/path/to.my/file' - ''
-'file.odd_one' - ''
-</pre>
 =={{header|C++}}==