School Commit Init

Anul 1/Semestrul 2/OS/Labs/c-test-practice/hello-remember.c

@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+struct node {
+    char* name;
+    struct node* next;
+};
+
+struct node* add(struct node* head, char* name) {
+    struct node* n;
+    struct node* p;
+
+    n = (struct node*)malloc(sizeof(struct node));
+    n->name = (char*)malloc(strlen(name)+1);
+    strcpy(n->name, name);
+    n->next = NULL;
+
+    if(head == NULL) {
+        return n;
+    } 
+
+    p = head;
+    while(p->next != NULL) {
+        p = p->next;
+    }
+    p->next = n;
+    return head;
+}
+
+int known(struct node* head, char *name) {
+    struct node* p;
+
+    p = head;
+    while(p != NULL && strcmp(p->name, name) != 0) {
+        p = p->next;
+    }
+    return p != NULL;
+}
+
+void clear(struct node* head) {
+    if(head == NULL) {
+        return;
+    }
+    clear(head->next);
+    free(head->name);
+    free(head);
+}
+
+int main(int argc, char** argv) {
+    char name[64];
+    struct node* head=NULL;
+
+    while(scanf("%s", name) == 1) {
+        if(known(head, name)) {
+            printf("Still around %s, eh?\n", name);
+        }
+        else {
+            head = add(head, name);
+            printf("Hello %s\n", name);
+        }
+    }
+    clear(head);
+    return 0;
+}

Anul 1/Semestrul 2/OS/Labs/c-test-practice/matrix-from-binary.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main(int argc, char** argv) {
+    int fd, rows, cols, i, j;
+    int** m;
+
+    if(argc <= 1) {
+        fprintf(stderr, "No input file specified");
+        exit(1);
+    }
+
+    fd = open(argv[1], O_RDONLY);
+    if(fd == -1) {
+        perror("Failed to open input file");
+        exit(1);
+    }
+
+    if(read(fd, &rows, sizeof(int)) <= 0) {
+        perror("Could not read the number of rows");
+        exit(1);
+    }
+
+    if(read(fd, &cols, sizeof(int)) <= 0) {
+        perror("Could not read the number of columns");
+        exit(1);
+    }
+
+    m = (int**)malloc(sizeof(int*)*rows);
+    for(i=0; i<rows; i++) {
+        m[i] = (int*)malloc(sizeof(int)*cols);
+        read(fd, m[i], sizeof(int)*cols);
+        for(j=0; j<cols; j++) {
+            printf("%2d" , m[i][j]);
+        }
+        printf("\n");
+    }
+    for(i=0;i<rows;i++){
+    	free(m[i]);
+    }
+
+    free(m);
+
+    close(fd);
+    return 0;
+}

Anul 1/Semestrul 2/OS/Labs/c-test-practice/matrix-from-text.c

@@ -0,0 +1,38 @@
+#include<stdio.h>
+#include<stdlib.h>
+
+int main(int argc, char** argv) {
+    FILE* f;
+    int rows, cols, i, j;
+    int** m;
+
+    f = fopen(argv[1], "r");
+    if(f == NULL) {
+        perror("Nu am putut deschide fisierul cu matricea");
+        return 1;
+    }
+
+    fscanf(f, "%d %d", &rows, &cols);
+    m = (int**)malloc(rows*sizeof(int*));
+    for(i=0; i<rows; i++) {
+        m[i] = (int*)malloc(cols*sizeof(int));
+        for(j=0; j<cols; j++) {
+            fscanf(f, "%d",&m[i][j]);
+        }
+    }
+    fclose(f);
+
+    for(i=0; i<rows;i++) {
+        for(j=0; j<cols; j++) {
+            printf("%2d ", m[i][j]);
+        }
+        printf("\n");
+    }
+
+    for(i=0; i<rows; i++) {
+        free(m[i]);
+    }
+    free(m);
+
+    return 0;
+}

Anul 1/Semestrul 2/OS/Labs/c-test-practice/matrix-to-binary.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+int main(int argc, char** argv) {
+    int** m;
+    FILE* f;
+    int i, j, rows, cols, fd;
+
+    f = fopen(argv[1], "r");
+    if(f == NULL) {
+        perror("Could not open file");
+        return 1;
+    }
+    fscanf(f, "%d %d", &rows, &cols);
+
+    m = (int**)malloc(sizeof(int*)*rows);
+    for(i=0; i<rows; i++) {
+        m[i] = (int*)malloc(sizeof(int)*cols);
+        for(j=0; j<cols; j++) {
+            fscanf(f, "%d",&m[i][j]);
+        }
+    }
+    fclose(f);
+
+    fd = open(argv[2], O_CREAT | O_WRONLY, 00600);
+    if(fd == -1) {
+        perror("Could not open destination file");
+        return 1;
+    }
+    write(fd, &rows, sizeof(int));
+    write(fd, &cols, sizeof(int));
+    for(i=0; i<rows; i++) {
+        for(j=0; j<cols; j++) {
+            write(fd, &m[i][j], sizeof(int));
+        }
+    }
+    close(fd);
+    for(i=0;i<rows;i++)
+    {
+    	free(m[i]);
+    }
+    free(m);
+    return 0;
+}

Anul 1/Semestrul 2/OS/Labs/c-test-practice/matrix.txt

@@ -0,0 +1,9 @@
+7 3
+1 2 3
+4 5 6
+7 8 9
+10 11 12
+13 14 15
+16 17 18
+19 20 21
+

Anul 1/Semestrul 2/OS/Labs/c-test-practice/names.txt

@@ -0,0 +1,9 @@
+Joe
+Ann
+John
+Mary
+Mike
+Pam
+Joe
+Pam
+Mike