1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
Homework n.1
Scrivere un programma in linguaggio C che permetta di copiare un numero
arbitrario di file regolari su una directory di destinazione preesistente.
Il programma dovra' accettare una sintassi del tipo:
$ homework-1 file1.txt path/file2.txt "nome con spazi.pdf" directory-destinazione
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int copyfile(int*, int*);
int main(int argc, char* argv[0])
{
int fd, fd_dst;
int i;
unsigned long size;
char dst[1024];
char buffer[1024];
char *p1, *p2;
if (argc < 3) {
fprintf(stderr, "Use %s <src1> [<src2>..] <dst>", argv[0]);
exit(1);
}
i = 1;
strncpy(dst, argv[argc - 1], 1024);
size = strlen(dst);
strncpy(dst + size, "/", 1024 - size);
size++;
while (i < argc - 1) {
/* Open the source file */
if ((fd = open(argv[i], O_RDONLY)) == -1) {
perror(argv[i]);
exit(1);
}
/* Open the destination file */
strncpy(buffer, dst, size);
p1 = p2 = argv[i++];
while (*p2 != '\0') {
if (*p2 == '/')
p1 = p2 + 1;
p2++;
}
strncpy(buffer + size, p1, 1024 - size);
if ((fd_dst = open(buffer, O_CREAT | O_TRUNC | O_WRONLY, 0644)) == -1) {
perror(argv[argc - 1]);
exit(1);
}
/* Ignore the return value, the last number of bytes returned. Result is
* always = 0 */
copyfile(&fd, &fd_dst);
close(fd);
close(fd_dst);
printf("`%s` written successfully\n", buffer);
}
return 0;
}
int copyfile(int* src, int* dst)
{
int n;
char* buffer[1024];
do {
if ((n = read(*src, buffer, 1024)) == -1) {
perror("Error reading the source file");
exit(1);
}
if (write(*dst, buffer, n) == -1) {
perror("Error writing the destination file");
exit(1);
}
} while (n > 0);
return n;
}
|
