[filesystem] Treat filename as case insensitive

Author: scopeInfinity

src/kernel/syscall/file_handler.c

@@ -11,11 +11,13 @@ int fh_switch(int operation) {
 }
 
 int file_handler_find(char *filename, union FFSFileEntry *entry) {
+    // search for filename case insensitive as keyboard driver currently
+    // doesn't support shift or caps lock.
     int file_id = 0;
     while (file_id < FS_FFS_FILEENTRY_COUNT) {
         int err = fetch_file_entry(
             FFS_UNIQUE_PARITION_ID, file_id, entry);
-        if(!err && strcmp(filename, entry->content.filename)==0) {
+        if(!err && strcmpi(filename, entry->content.filename)==0) {
             // match
             return file_id;
         }

src/usr/local/src/cat.c

@@ -3,14 +3,11 @@
 #include <string.h>
 
 void process(char filename[]) {
-    printf("file: %s\n", filename);
-
     FILE *handler = fopen(filename, "r");
     if(handler==NULL) {
-        printf("file open: failed: %s\n", filename);
+        printf("failed to open '%s' file.\n", filename);
         return;
     }
-    puts("content: \n");
     char buffer[80];
     for (size_t i = 0; i < 20; i++) {
         if (!fgets(buffer, sizeof(buffer), handler)) {

tests/app/cat_test.sh

@@ -4,7 +4,7 @@
 
 QEMU_SCREENSHOT_NAME="cat_test.ppm"
 
-python3 -m tests.qemu.monitor -p ${MONITOR_PORT:?} -sc run cat
+python3 -m tests.qemu.monitor -p ${MONITOR_PORT:?} -sc run cat readme.md
 
 test_create_screen_dump
 test_screen_content $LINENO "Experimental OS"