First commit

content/progsys/TDM_2-fichiers/index.md

@@ -0,0 +1,7 @@
+---
+title: "TDM : Les fichiers"
+date: 2018-09-11
+categories : ['Programmation système', 'TDM']
+---
+
+Pas encore de contenu

content/progsys/TDM_2-fichiers/src/question1.c

@@ -0,0 +1,26 @@
+#include <unistd.h>
+#include <stdlib.h>
+
+int main () {
+    char buffer[32];
+    int ret, read_ret;
+    int next_read = 1;
+    do {
+        read_ret = read(STDIN_FILENO, buffer, 1);
+        switch ( read_ret ) {
+            case -1 :
+                write (STDERR_FILENO,"Error when reading\n", 19);
+                exit(EXIT_FAILURE);
+            case 0:
+               next_read = 0;
+               break;
+            default:
+                ret = write(STDOUT_FILENO, buffer, 1);
+                if ( ret == -1){
+                    write (STDERR_FILENO,"Error when writing\n", 19);
+                    exit(EXIT_FAILURE);
+                }
+        }
+    } while (  next_read );
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_2-fichiers/src/question2.c

@@ -0,0 +1,27 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main () {
+    int fd,i;
+    char alphabet[26] = "abcdefghijklmnopqrstuvwxyz";
+
+    //open file
+    fd = open("tp2-q2.txt",O_WRONLY | O_CREAT, S_IRWXU); 
+    if ( fd == -1 ) {
+        write(STDERR_FILENO,"Error when opening file\n", 25);
+        exit(EXIT_FAILURE);
+    }
+    for (i=0;i<26;i++) {
+        if ( write(fd, &alphabet[i], 1) == -1 || write(fd,"\n",1) == -1){
+            write (STDERR_FILENO,"Error when writing\n", 19);
+            exit(EXIT_FAILURE);
+        }
+    }
+    //Clode file
+    if ( close(fd) == -1){
+        write(STDERR_FILENO, "Can't close file.\n", 18);
+    }
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_2-fichiers/src/question3.c

@@ -0,0 +1,24 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#define  HOLE 10000
+
+int main (int argc, char **argv) {
+    int fd = open("td2-q3.txt", O_WRONLY | O_CREAT, S_IRWXU);
+    if ( fd < 0) {
+        write(STDOUT_FILENO, "Error : can't open file\n", 24);
+        exit(EXIT_FAILURE);
+    }
+    for (int i=0;i<4;i++){
+        if ( write(fd, "A", 1) == -1 || lseek(fd, HOLE, SEEK_CUR) == -1) {
+            write(STDOUT_FILENO, "Error : can't write to file.\n", 29);
+            exit(EXIT_FAILURE);
+        }
+    }
+    if ( close(fd) == -1) {
+        write(fd,"Error : can't close file.\n", 26);
+        exit(EXIT_FAILURE);
+    }
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_2-fichiers/src/question4.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER 32
+
+int main () {
+   char read_error[] = "Error when reading input.\n";
+#include <string.h>
+    char buff[BUFFER];
+    FILE *out, *in;
+    in = fdopen(STDIN_FILENO, "r");
+    out = fdopen(STDOUT_FILENO,"w");
+    int count;
+    while ((count = fread(&buff, BUFFER,1,in)) > 0)
+    {
+        fwrite(&buff, BUFFER,1,out);
+    }
+    if ( count == -1 ){
+        fwrite(&read_error, strlen(read_error) + 1,1,fdopen(STDERR_FILENO,"w"));
+    }
+    exit(EXIT_SUCCESS);
+}

content/progsys/TDM_2-fichiers/src/question5.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+void output_error() {
+    fprintf(stderr,"Error : %s\n",strerror(errno));
+    exit(EXIT_FAILURE);
+}
+
+int main() {
+    char *file = "tp2_q5.txt";
+    FILE *f = fopen(file,"w");
+    char m[56] = "\0";
+    char ret = '\n';
+    if ( f == NULL ){
+        output_error();
+    }
+    for(char i='a' ;i<='z' ; i++){
+        strncat(m,&i,1);
+        strncat(m,&ret,1);
+    }
+    fwrite(&m,strlen(m) + 1,1,f);
+    if ( ferror(f) ) {
+        output_error();
+    } 
+    fclose(f);
+    if ( ferror(f) ){
+        output_error();
+    }
+    exit(EXIT_SUCCESS);
+}