From ee9d3c0fecd5206adf448184ecb350079dc6f19c Mon Sep 17 00:00:00 2001
From: m-sirotkin <89928654+pipichinka@users.noreply.github.com>
Date: Mon, 1 May 2023 18:52:43 +0700
Subject: [PATCH 1/2] Create lab3.2

---
 lab3.2 | 317 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 317 insertions(+)
 create mode 100644 lab3.2

diff --git a/lab3.2 b/lab3.2
new file mode 100644
index 0000000..897b7a5
--- /dev/null
+++ b/lab3.2
@@ -0,0 +1,317 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <errno.h>
+#include <dirent.h>
+#include <sys/unistd.h>
+
+
+int mymkdir(char* name){
+    if (mkdir(name, 0777)){
+        perror("mymkdir: removing dir");
+        return 1;
+    }
+    return 0;
+}
+
+
+int myls(char* name){
+    DIR* dir;
+    if ((dir = opendir(name)) == NULL){
+        perror("myls: openning dir");
+        return 1;
+    }
+    struct dirent* ep;
+    while ((ep = readdir (dir)) != NULL){
+        printf("%s\n", ep->d_name);
+    }    
+    if (errno){
+        perror("myls: reading dir");
+        closedir(dir);
+        return 1;
+    }
+    if (closedir(dir)){
+        perror("myls: closing dir");
+        return 1;
+    }
+    return 0;
+}
+
+
+int myrmdir(char* name){
+    if (rmdir(name)){
+        perror("myrmdir: removing dir");
+        return 1;
+    }
+    return 0;
+}
+
+
+int mytouch(char* name){
+    int fd = creat(name,0644);
+    if (fd == -1){ 
+        perror("mytouch: creating file");
+        return 1;
+    }
+    if (close(fd)){
+        perror("mytouch: closing created file");
+    }
+    return 0;
+}
+
+
+int mycat(char* name){
+    FILE* file = fopen(name, "r");
+    if (file == NULL){
+        perror("mycat: openning file:");
+    }
+    size_t size;
+    char buffer[4096];
+    while((size = fread(buffer, sizeof(char), 4096, file))){
+        if (write(0,buffer,size )== 0){
+            perror("mycat: printing file");
+            fclose(file);
+            return 1;
+        }
+    }
+    if (ferror(file)){
+        perror("mycat: closing file");
+        fclose(file);
+        return 1;
+    }
+    if (fclose(file)){
+        perror("mycat: closing file");
+    }
+    return 0;
+}
+
+
+int myrm(char* name){
+    if (unlink(name)){
+        perror("myrm: removing file");
+        return 1;
+    }
+    return 0;
+}
+
+
+int myhl(char* name1, char* name2){
+    if (link(name1, name2)){
+        perror("myhl: linking files");
+        return 1;
+    }
+    return 0;
+}
+
+
+int mylns(char* name1, char* name2){
+    if (symlink(name1, name2)){
+        perror("mylns: linking files");
+        return 1;
+    }
+    return 0;
+}
+
+
+int mycatvsl(char* name){
+    struct stat st;
+    if (lstat(name, &st)){
+        perror("mycatvsl: getting information about the link");
+        return 1;
+    }
+    char buffer[st.st_size + 1];
+    size_t len = readlink(name, buffer, st.st_size + 1);
+    if (len == 0){
+        perror("mycatvsl ");
+        return 1;
+    }
+    buffer[len] = '\n';
+    buffer[len +1] = '\0';
+    if (write(1, buffer, len + 1) == 0){
+        perror("mycatvsl ");
+        return 1;
+    }
+    return 0;
+}
+
+
+int myinfo(char* name){
+    struct stat st;
+    if (stat(name, &st)){
+        perror("myinfo: getting information about file");
+        return 1;
+    }
+
+    printf("%s info: number of hard links: %lu.", name, st.st_nlink);
+    char rights[10];
+    unsigned long int rights_int = (__uintmax_t) st.st_mode;
+    for (int i = 0; i < 3; i++){
+        rights[3 * i ] = rights_int & (0400 >> (3 * i)) ? 'r':'-';
+        rights[3 * i + 1] = rights_int & (0200 >> (3 * i)) ? 'w':'-';
+        rights[3 * i + 2] = rights_int & (0100 >> (3 * i)) ? 'x':'-';
+    }
+    rights[9] ='\0';
+    printf(" rights: %s\n", rights);
+    return 0;
+}
+
+
+int mychmod(char* name, char* rights){
+    struct stat st;
+    if (stat(name, &st)){
+        perror("mychmod: getting info about file");
+        return 1;
+    }
+    st.st_mode = (st.st_mode >> 8) << 8;
+    if (strlen(rights) != 9){
+        fprintf(stderr, "invalid rights len(it should be 9)");
+        return 1;
+    }
+
+    for (int i = 0; i < 9; i++){
+        if (rights[i] != 'w' && rights[i] != 'r' && rights[i] != 'x' && rights[i] != '-'){
+            fprintf(stderr, "invalid righs format(only letters r,w,x,- are allowed)");
+            return 1;
+        }
+    }
+
+    for (int i = 0; i < 3; i++){
+        st.st_mode = rights[3 * i] == 'r' ? (st.st_mode | (0400 >> (3 * i))) : st.st_mode;
+        st.st_mode = rights[3 * i + 1] == 'w' ? (st.st_mode | (0200 >> (3 * i))) : st.st_mode;
+        st.st_mode = rights[3 * i + 2] == 'x' ? (st.st_mode | (0100 >> (3 * i))) : st.st_mode;
+    }
+    if (chmod(name, st.st_mode)){
+        perror("mychmod: setting rights");
+        return 1;
+    }
+    return 0;
+}
+
+
+int main(int argc, char** argv){
+    if (argc == 0){
+        printf("can't recognise hardlink at this program");
+        return 1;
+    }
+    // if (argc == 1){
+    //     printf("argv[0] %s\n", argv[0]);
+    // }
+    char* exe_name = strrchr(argv[0], '/') + 1;
+    if (exe_name == (char* ) NULL + 1 ){
+        fprintf(stderr,"error");
+        return 1;
+    }
+
+    if (!strcmp(exe_name, "mymkdir")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: dir name)");
+            return 1;
+        }
+        return mymkdir(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myls")){
+        if (argc == 1){
+            return myls(".");
+        }
+        else if (argc > 2){
+            fprintf(stderr, "invalid bymber of arguments(requars 1 argument: dir name. This prigram can be used with 0 arguments (\".\" used as argument))");
+            return 1;
+        }   
+        return myls(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myrmdir")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: dir name)");
+            return 1;
+        }
+        return myrmdir(argv[1]);
+    }
+    else if (!strcmp(exe_name, "mytouch")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
+            return 1;
+        }
+        return mytouch(argv[1]);
+    }
+    else if (!strcmp(exe_name, "mycat")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
+            return 1;
+        }
+        return mycat(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myrm")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
+            return 1;
+        }
+        return myrm(argv[1]);
+    }
+    else if (!strcmp(exe_name, "mylns")){
+        if (argc != 3){
+            fprintf(stderr, "ivalid number of arguments(requars 2 arg: original name, symlink name)");
+            return 1;
+        }
+        return mylns(argv[1], argv[2]);
+    }
+    else if (!strcmp(exe_name, "mycatvsl")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
+            return 1;
+        }
+        return mycatvsl(argv[1]);
+    }
+    else if (!strcmp(exe_name, "mycatsl")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
+            return 1;
+        }
+        return mycat(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myrmsl")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
+            return 1;
+        }
+        return myrm(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myhl")){
+        if (argc != 3){
+            fprintf(stderr, "ivalid number of arguments(requars 2 arg: original name, new hardlink name)");
+            return 1;
+        }
+        return myhl(argv[1], argv[2]);
+    }
+    else if (!strcmp(exe_name, "myrmhl")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: hardlink name)");
+            return 1;
+        }
+        return myrm(argv[1]);
+    }
+    else if (!strcmp(exe_name, "myinfo")){
+        if (argc != 2){
+            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file or dir name)");
+            return 1;
+        }
+        return myinfo(argv[1]);
+    }
+    else if (!strcmp(exe_name, "mychmod")){
+        if (argc != 3){
+            fprintf(stderr, "ivalid number of arguments(requars 2 arg: file or dir name, rightsline (symbols w,r,x,-))");
+            return 1;
+        }
+        return mychmod(argv[1], argv[2]);
+    }
+    
+
+    fprintf(stderr, "can't recognise behave by this hardlink");
+    return 1;
+
+
+}

From 6968f490edb83bc700f563ec635686cd463e51c4 Mon Sep 17 00:00:00 2001
From: m-sirotkin <89928654+pipichinka@users.noreply.github.com>
Date: Tue, 9 May 2023 23:19:37 +0700
Subject: [PATCH 2/2] Update lab3.2

---
 lab3.2 | 256 ++++-----------------------------------------------------
 1 file changed, 17 insertions(+), 239 deletions(-)

diff --git a/lab3.2 b/lab3.2
index 897b7a5..1913526 100644
--- a/lab3.2
+++ b/lab3.2
@@ -9,12 +9,12 @@
 #include <errno.h>
 #include <dirent.h>
 #include <sys/unistd.h>
-
-
+#define ERROR 1
+#define RIGHTS_LEN 9
 int mymkdir(char* name){
     if (mkdir(name, 0777)){
         perror("mymkdir: removing dir");
-        return 1;
+        return ERROR;
     }
     return 0;
 }
@@ -24,20 +24,20 @@ int myls(char* name){
     DIR* dir;
     if ((dir = opendir(name)) == NULL){
         perror("myls: openning dir");
-        return 1;
+        return ERROR;
     }
-    struct dirent* ep;
-    while ((ep = readdir (dir)) != NULL){
-        printf("%s\n", ep->d_name);
+    struct dirent* entry_element;
+    while ((entry_element = readdir (dir)) != NULL){
+        printf("%s\n", entry_element->d_name);
     }    
     if (errno){
         perror("myls: reading dir");
         closedir(dir);
-        return 1;
+        return ERROR;
     }
     if (closedir(dir)){
         perror("myls: closing dir");
-        return 1;
+        return ERROR;
     }
     return 0;
 }
@@ -46,7 +46,7 @@ int myls(char* name){
 int myrmdir(char* name){
     if (rmdir(name)){
         perror("myrmdir: removing dir");
-        return 1;
+        return ERROR;
     }
     return 0;
 }
@@ -56,10 +56,11 @@ int mytouch(char* name){
     int fd = creat(name,0644);
     if (fd == -1){ 
         perror("mytouch: creating file");
-        return 1;
+        return ERROR;
     }
     if (close(fd)){
         perror("mytouch: closing created file");
+        return ERROR;
     }
     return 0;
 }
@@ -69,249 +70,26 @@ int mycat(char* name){
     FILE* file = fopen(name, "r");
     if (file == NULL){
         perror("mycat: openning file:");
+        return ERROR;
     }
     size_t size;
     char buffer[4096];
     while((size = fread(buffer, sizeof(char), 4096, file))){
-        if (write(0,buffer,size )== 0){
+        if (fwrite(buffer, size, 1, stdout )== 0){
             perror("mycat: printing file");
             fclose(file);
-            return 1;
+            return ERROR;
         }
     }
     if (ferror(file)){
         perror("mycat: closing file");
         fclose(file);
-        return 1;
+        return ERROR;
     }
     if (fclose(file)){
         perror("mycat: closing file");
+        return ERROR;
     }
     return 0;
 }
 
-
-int myrm(char* name){
-    if (unlink(name)){
-        perror("myrm: removing file");
-        return 1;
-    }
-    return 0;
-}
-
-
-int myhl(char* name1, char* name2){
-    if (link(name1, name2)){
-        perror("myhl: linking files");
-        return 1;
-    }
-    return 0;
-}
-
-
-int mylns(char* name1, char* name2){
-    if (symlink(name1, name2)){
-        perror("mylns: linking files");
-        return 1;
-    }
-    return 0;
-}
-
-
-int mycatvsl(char* name){
-    struct stat st;
-    if (lstat(name, &st)){
-        perror("mycatvsl: getting information about the link");
-        return 1;
-    }
-    char buffer[st.st_size + 1];
-    size_t len = readlink(name, buffer, st.st_size + 1);
-    if (len == 0){
-        perror("mycatvsl ");
-        return 1;
-    }
-    buffer[len] = '\n';
-    buffer[len +1] = '\0';
-    if (write(1, buffer, len + 1) == 0){
-        perror("mycatvsl ");
-        return 1;
-    }
-    return 0;
-}
-
-
-int myinfo(char* name){
-    struct stat st;
-    if (stat(name, &st)){
-        perror("myinfo: getting information about file");
-        return 1;
-    }
-
-    printf("%s info: number of hard links: %lu.", name, st.st_nlink);
-    char rights[10];
-    unsigned long int rights_int = (__uintmax_t) st.st_mode;
-    for (int i = 0; i < 3; i++){
-        rights[3 * i ] = rights_int & (0400 >> (3 * i)) ? 'r':'-';
-        rights[3 * i + 1] = rights_int & (0200 >> (3 * i)) ? 'w':'-';
-        rights[3 * i + 2] = rights_int & (0100 >> (3 * i)) ? 'x':'-';
-    }
-    rights[9] ='\0';
-    printf(" rights: %s\n", rights);
-    return 0;
-}
-
-
-int mychmod(char* name, char* rights){
-    struct stat st;
-    if (stat(name, &st)){
-        perror("mychmod: getting info about file");
-        return 1;
-    }
-    st.st_mode = (st.st_mode >> 8) << 8;
-    if (strlen(rights) != 9){
-        fprintf(stderr, "invalid rights len(it should be 9)");
-        return 1;
-    }
-
-    for (int i = 0; i < 9; i++){
-        if (rights[i] != 'w' && rights[i] != 'r' && rights[i] != 'x' && rights[i] != '-'){
-            fprintf(stderr, "invalid righs format(only letters r,w,x,- are allowed)");
-            return 1;
-        }
-    }
-
-    for (int i = 0; i < 3; i++){
-        st.st_mode = rights[3 * i] == 'r' ? (st.st_mode | (0400 >> (3 * i))) : st.st_mode;
-        st.st_mode = rights[3 * i + 1] == 'w' ? (st.st_mode | (0200 >> (3 * i))) : st.st_mode;
-        st.st_mode = rights[3 * i + 2] == 'x' ? (st.st_mode | (0100 >> (3 * i))) : st.st_mode;
-    }
-    if (chmod(name, st.st_mode)){
-        perror("mychmod: setting rights");
-        return 1;
-    }
-    return 0;
-}
-
-
-int main(int argc, char** argv){
-    if (argc == 0){
-        printf("can't recognise hardlink at this program");
-        return 1;
-    }
-    // if (argc == 1){
-    //     printf("argv[0] %s\n", argv[0]);
-    // }
-    char* exe_name = strrchr(argv[0], '/') + 1;
-    if (exe_name == (char* ) NULL + 1 ){
-        fprintf(stderr,"error");
-        return 1;
-    }
-
-    if (!strcmp(exe_name, "mymkdir")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: dir name)");
-            return 1;
-        }
-        return mymkdir(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myls")){
-        if (argc == 1){
-            return myls(".");
-        }
-        else if (argc > 2){
-            fprintf(stderr, "invalid bymber of arguments(requars 1 argument: dir name. This prigram can be used with 0 arguments (\".\" used as argument))");
-            return 1;
-        }   
-        return myls(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myrmdir")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: dir name)");
-            return 1;
-        }
-        return myrmdir(argv[1]);
-    }
-    else if (!strcmp(exe_name, "mytouch")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
-            return 1;
-        }
-        return mytouch(argv[1]);
-    }
-    else if (!strcmp(exe_name, "mycat")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
-            return 1;
-        }
-        return mycat(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myrm")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file name)");
-            return 1;
-        }
-        return myrm(argv[1]);
-    }
-    else if (!strcmp(exe_name, "mylns")){
-        if (argc != 3){
-            fprintf(stderr, "ivalid number of arguments(requars 2 arg: original name, symlink name)");
-            return 1;
-        }
-        return mylns(argv[1], argv[2]);
-    }
-    else if (!strcmp(exe_name, "mycatvsl")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
-            return 1;
-        }
-        return mycatvsl(argv[1]);
-    }
-    else if (!strcmp(exe_name, "mycatsl")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
-            return 1;
-        }
-        return mycat(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myrmsl")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: symlink name)");
-            return 1;
-        }
-        return myrm(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myhl")){
-        if (argc != 3){
-            fprintf(stderr, "ivalid number of arguments(requars 2 arg: original name, new hardlink name)");
-            return 1;
-        }
-        return myhl(argv[1], argv[2]);
-    }
-    else if (!strcmp(exe_name, "myrmhl")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: hardlink name)");
-            return 1;
-        }
-        return myrm(argv[1]);
-    }
-    else if (!strcmp(exe_name, "myinfo")){
-        if (argc != 2){
-            fprintf(stderr, "ivalid number of arguments(requars 1 arg: file or dir name)");
-            return 1;
-        }
-        return myinfo(argv[1]);
-    }
-    else if (!strcmp(exe_name, "mychmod")){
-        if (argc != 3){
-            fprintf(stderr, "ivalid number of arguments(requars 2 arg: file or dir name, rightsline (symbols w,r,x,-))");
-            return 1;
-        }
-        return mychmod(argv[1], argv[2]);
-    }
-    
-
-    fprintf(stderr, "can't recognise behave by this hardlink");
-    return 1;
-
-
-}