created utils module

1 files changed, 95 insertions, 0 deletions

diff --git a/src/modules/utils/utils.c b/src/modules/utils/utils.c
new file mode 100644
index 0000000..d5a3a96
--- /dev/null
+++ b/src/modules/utils/utils.c
@@ -0,0 +1,95 @@
+#include <string.h>
+#include <stdlib.h>
+
+
+/* function: char *string_format(char* string)
+ * input: pointer to a null-terminated string (must not be NULL)
+ * return: pointer to a newly allocated string containing all space-separated words,
+ * 	joined by single spaces; leading/trailing/multiple spaces are ignored.
+ * on-error: returns NULL if memory allocation fails
+ * misc: the returned pointer must be freed by the caller using free()
+ * limits: processes at most 10 words, each up to 49 characters (last '\0')
+ */
+char *string_format(char* string) {
+    // Wörterbuch array [Wort][Zeichenkette]
+    char woerter[10][50] = { 0 };
+    int wort_index = 0;
+    int char_index = 0;
+
+    while (*string != '\0') {
+	// add '\0' stringterminator to end of word
+	if (*string == ' ' && char_index > 0) {
+	    // safty check for array length
+	    if (wort_index > 9 || char_index > 49) {
+		break;
+	    }
+
+	    // next slot is char
+	    // add '\0' to end string
+	    woerter[wort_index][char_index] = '\0';
+	    wort_index++;
+	    char_index = 0;
+	    string++;
+	    continue;
+	} 
+	// skip extra spaces
+	else if (*string == ' ' && char_index == 0) {
+	    string++;
+	    continue;
+	}
+
+	// safty check for array length
+	if (char_index >= 49) {
+	    break;
+	}
+
+	woerter[wort_index][char_index] = *string;
+	char_index++;
+	string++;
+    }
+
+    // terminate last word with '\0'
+    if (char_index > 0 && wort_index < 10 && char_index < 49) {
+	woerter[wort_index][char_index] = '\0';
+	wort_index++;
+    }
+
+    /* 
+     * return
+     */
+    char *ptr = NULL;
+
+    // get length of woerter array
+    if (wort_index == 0) {
+	ptr = NULL;
+    } else {
+    	int sum = 0;
+
+	for (int i = 0; i < wort_index; i++) {
+	    sum += strlen(woerter[i]);
+	}
+	sum += wort_index - 1; // for spaces
+	sum += 1; // for Nulltermination
+    
+
+	ptr = (char *)malloc(sum);
+
+	// check for NULL pointer
+	if (ptr == NULL) {
+	    return NULL;
+	}
+
+	//strcpy
+	char *ende = ptr;
+
+	for (int i = 0; i < wort_index; i++) {
+	    ende = stpcpy(ende, woerter[i]);
+
+	    if (i != wort_index - 1) {
+		*(ende++) = ' ';
+	    }
+	}
+    }
+
+    return ptr;
+}