Lab Complete

Labs/Lab04/Makefile

@@ -6,3 +6,5 @@ head2: head2.o fileio.o
 	$(CC) $(CFLAGS) head2.o fileio.o -o head2
 head3: head3.o fileio.o
 	$(CC) $(CFLAS) head3.o fileio.o -o head3
+string_tokens: string_tokens.o
+	$(CC) $(CFLAS) string_tokens.o -o string_tokens

Labs/Lab04/string_tokens.c

+
+/* Kyle Chrysler
+ * Tuesday 1:20
+ * lab 04 - string_tokens.c
+ * compile with: string_tokens
+ * notes: none
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+// reimplemented from man strtok
+int
+main(int argc, char *argv[])
+{
+    char *token, *subtoken;
+    // saveptrs store the state for strtok
+    char *saveptr1, *saveptr2;
+    int token_num = 1;
+
+    if (argc != 4) {
+        fprintf(stderr, "Usage: %s string delim subdelim\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    // initialize tokenization with argv[1] as str
+    token = strtok_r(argv[1], argv[2], &saveptr1);
+    while (token != NULL){
+      // while we have a token, first print it
+      printf("token %d: %s\n", token_num, token);
+      // then begin extracting subtokens from token
+      subtoken = strtok_r(token, argv[3], &saveptr2);
+      while (subtoken != NULL){
+        // print the subtoken
+        printf(" subtoken --> %s\n", subtoken);
+        // try to get next subtoken, using saveptr
+        subtoken = strtok_r(NULL, argv[3], &saveptr2);
+      }
+      // try to get next token, using saveptr
+      token = strtok_r(NULL, argv[2], &saveptr1);
+      token_num ++;
+    }
+
+    exit(EXIT_SUCCESS);
+}
+