Add Project 2 Files

1 files changed, 221 insertions, 0 deletions

diff --git a/P2/src/mapper.c b/P2/src/mapper.c
new file mode 100644
index 0000000..469b32e
--- /dev/null
+++ b/P2/src/mapper.c
@@ -0,0 +1,221 @@
+#include "mapper.h"
+
+// combined value list corresponding to a word <1,1,1,1....>
+valueList *createNewValueListNode(char *value){
+	valueList *newNode = (valueList *)malloc (sizeof(valueList));
+	strcpy(newNode -> value, value);
+	newNode -> next = NULL;
+	return newNode;
+}
+
+// insert new count to value list
+valueList *insertNewValueToList(valueList *root, char *count){
+	valueList *tempNode = root;
+	if(root == NULL)
+		return createNewValueListNode(count);
+	while(tempNode -> next != NULL)
+		tempNode = tempNode -> next;
+	tempNode -> next = createNewValueListNode(count);
+	return root;
+}
+
+// free value list
+void freeValueList(valueList *root) {
+	if(root == NULL) return;
+
+	valueList *tempNode = NULL;
+	while (root != NULL){
+		tempNode = root;
+		root = root -> next;
+		free(tempNode);
+	}
+}
+
+// create <word, value list>
+intermediateDS *createNewInterDSNode(char *word, char *count){
+	intermediateDS *newNode = (intermediateDS *)malloc (sizeof(intermediateDS));
+	strcpy(newNode -> key, word);
+	newNode -> value = NULL;
+	newNode -> value = insertNewValueToList(newNode -> value, count);
+	newNode -> next = NULL;
+	return newNode;
+}
+
+// insert <word, value> to intermediate DS
+intermediateDS *insertPairToInterDS(intermediateDS *root, char *word, char *count){
+	intermediateDS *tempNode = root;
+	if(root == NULL)
+		return createNewInterDSNode(word, count);
+	while(tempNode -> next != NULL) {
+		if(strcmp(tempNode -> key, word) == 0){
+			tempNode -> value = insertNewValueToList(tempNode -> value, count);
+			return root;
+		}
+		tempNode = tempNode -> next;
+		
+	}
+	if(strcmp(tempNode -> key, word) == 0){
+		tempNode -> value = insertNewValueToList(tempNode -> value, count);
+	} else {
+		tempNode -> next = createNewInterDSNode(word, count);
+	}
+	return root;
+}
+
+// free intermediate DS
+void freeInterDS(intermediateDS *root) {
+	if(root == NULL) return;
+
+	intermediateDS *tempNode = NULL;
+	while (root != NULL){
+		tempNode = root;
+		root = root -> next;
+		freeValueList(tempNode -> value);
+		free(tempNode);
+	}
+}
+
+// emit the <key, value> into intermediate DS 
+void emit(char *key, char *value) {
+	// printf("To be emitted: %s, %s\n", (char *)key, value);
+	interDS = insertPairToInterDS(interDS, key, value);
+}
+
+// map function
+void map(char *chunkData){
+	char *cData = chunkData;
+	char *buffer;
+	int i = 0;
+
+	while((buffer = getWord(cData, &i)) != NULL){
+		emit(buffer, "1");
+		free(buffer);
+		buffer = NULL;
+	}
+}
+
+// generate the file name for word.txt
+char *generateWordFileName(char *word){
+	char fileName[MAXKEYSZ];
+	memset(fileName, '\0', MAXKEYSZ);
+	strcpy(fileName, word);
+	strcat(fileName, ".txt");
+	fileName[strlen(fileName)] = '\0';
+
+	char *wordFileName = (char*)malloc(sizeof(char) * (2 * MAXKEYSZ));
+	memset(wordFileName, '\0', (2 * MAXVALUESZ));
+	strcpy(wordFileName, mapOutDir);
+	strcat(wordFileName, "/");
+	strcat(wordFileName, fileName);
+	wordFileName[strlen(wordFileName)] = '\0';
+
+	return wordFileName;
+	
+}
+
+// write intermediate data to separate word.txt files
+// Each file will have only one line <word 1 1 1 1 1 ...>
+void writeIntermediateDS() {
+	intermediateDS *travNode = interDS;
+
+	while(travNode != NULL) {
+		// create file word.txt
+		// content : word 1 1 1 1 1 1.....
+		char *wordFileName = generateWordFileName(travNode -> key);
+		int fd = open(wordFileName, O_CREAT | O_WRONLY, 0777);
+		if (fd < 0){
+			printf("ERROR: Cannot open the file %s\n", wordFileName);
+			exit(0);
+		}
+
+		// word write
+		int ret = write(fd, travNode -> key, strlen(travNode -> key));
+		if(ret < 0){
+			printf("ERROR: Cannot write to file %s\n", wordFileName);
+			exit(0);
+		}
+
+		// append space
+		ret = write(fd, " ", 1);
+		if(ret < 0){
+			printf("ERROR: Cannot write to file %s\n", wordFileName);
+			exit(0);
+		}
+
+		// append value list
+		valueList *tNode = travNode -> value;
+		while(tNode -> next != NULL){
+			ret = write(fd, tNode -> value, strlen(tNode -> value)); // space after the word
+			if(ret < 0){
+				printf("ERROR: Cannot write to file %s\n", wordFileName);
+				exit(0);
+			}
+
+			// append space
+			ret = write(fd, " ", 1);
+			if(ret < 0){
+				printf("ERROR: Cannot write to file %s\n", wordFileName);
+				exit(0);
+			}
+			tNode = tNode -> next;
+		}
+
+		// last value
+		ret = write(fd, tNode -> value, strlen(tNode -> value)); // space after the word
+		if(ret < 0){
+			printf("ERROR: Cannot write to file %s\n", wordFileName);
+			exit(0);
+		}
+
+		// append newline
+		ret = write(fd, "\n", 1);
+		if(ret < 0){
+			printf("ERROR: Cannot write to file %s\n", wordFileName);
+			exit(0);
+		}
+		//close file
+		close(fd);
+
+		// go to next word in intermediate DS
+		travNode = travNode -> next;
+	}
+}
+
+int main(int argc, char *argv[]) {
+	
+	if (argc < 2) {
+		printf("Less number of arguments.\n");
+		printf("./mapper mapperID\n");
+		exit(0);
+	}
+
+	// initializing global variables
+	mapperID = strtol(argv[1], NULL, 10);
+	interDS = NULL;
+
+	//create folder specifically for this mapper in output/MapOut
+	mapOutDir = createMapDir(mapperID);
+
+
+	int count = 0;
+	while(1) {
+		char chunkData[chunkSize + 1];
+		memset(chunkData, '\0', chunkSize + 1);
+
+		char *retChunk = getChunkData(mapperID);
+		if(retChunk == NULL) {
+			break;
+		}
+		count++;
+		strcpy(chunkData, retChunk);
+		free(retChunk);
+
+		map(chunkData);
+	}
+
+	//student code
+	writeIntermediateDS();
+	freeInterDS(interDS);
+
+	return 0;
+}
\ No newline at end of file