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