scr

SCR1.2/TP11/reponses.txt

@@ -0,0 +1,92 @@
+Exercice 1:
+
+read_file.c fait la même chose que cat.
+
+
+#define BUTS7 256
+#define LEN 128
+
+int main(int argc,char*argv[]
+{
+ int n
+ if(argc<2)
+ {
+  n=snprintf(str,LEN,"Usage: %s <FILE_NAME>\n",argv[0]);
+  write(2,str,n);
+  exit(1);
+ }
+}
+//alternative
+if(argc<2)
+{
+ write(2,"Usages: ",7);
+ write(2,argv[0],strlen(argv[0]));
+ write(2," <FILE_NAME>\n",13);
+ exit(1);
+}
+  
+
+fd=open(argv[1],O_RDONLY);
+if(fd ==-1)
+{
+ perror("Openning file fails"); //perror affiche mon message puis le message standard associé a l'erreur qui vient de se produire
+ exit(2);
+}
+while(n=read(fd,buf,BUFS7))
+{
+ if(n==1)
+ {
+  perror("Read in file fails");
+  exit(3);
+ }
+ while(m==write(1,buf,n));
+ if(m==-1)
+ {
+  perror("write to stdait fails");
+  exit(4);
+ }
+ close(fd);
+ exit(0);
+}
+
+--------------------------------------------------------------------------------------------------------------
+Exercice 2:
+
+Copy.c fait la même chose que cp
+
+#define BUFS7 256
+#define LEN 128
+
+int main(int argc,char*argv[])
+{
+ int fdr,fdw,m,n;char buf[BUFS7];char str[LEN];
+ if(argc<3)
+ {
+  n =snprintf(str,LEN,"Usage %s <SRC_FILE><DEST_FILE>\n",argv[0]);
+  write(2,str,n);
+  exit(1);
+ }
+ fdr=open (argv[1],O_RDONLY];
+ if(fdr==-1)
+ {
+  perror("Openning SRC_FILES fails");
+  exit(2);
+ }
+ fdw=open(argv[2],O_WRONLY|O_CREAT|O_TRUNC,0600);
+ if(fdw==-1)
+ {
+  perror("Openning DEST_FILE fails");
+  exit(3);
+ }
+ 
+--------------------------------------------------------------------------------------------------------------
+
+Exercice 4 :
+
+fd = open(argv[1]; ...)
+write(1,"Numb --> ",9);
+while (n =read (0,s,BUFS7))
+{
+ if (n == -1)
+ {
+