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#include "command.h"
#include "lslib.h"
#include <dirent.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
static struct {
bool recurse;
bool preserve;
bool sym_link;
bool hard_link;
bool verbose;
} flags;
static void help(void) {
printf("Usage: cp [-rplsv] SOURCE... DEST\n\n");
printf("Copy SOURCEs to DEST\n\n");
printf("\t-R,-r\tRecurse\n");
printf("\t-p\tPreserve file attributes if possible\n");
printf("\t-l,-s\tCreate (sym)links\n");
printf("\t-v\tVerbose\n");
}
static int short_arg(char c, char* next) {
UNUSED(next);
switch (c) {
case 'R':
case 'r':
flags.recurse = true;
break;
case 'p':
flags.preserve = true;
break;
case 'l':
flags.hard_link = true;
flags.sym_link = false;
break;
case 's':
flags.sym_link = true;
flags.hard_link = false;
break;
case 'v':
flags.verbose = true;
break;
default:
return ARG_INVALID;
}
return ARG_UNUSED;
}
static bool copy_file(char* from, char* to) {
#define BS 1024
FILE *from_f, *to_f;
char buf[BS];
int read;
from_f = get_file_s(from, "r");
if (from_f == NULL) { return false; }
to_f = get_file_s(to, "w");
if (to_f == NULL) { fclose(from_f); return false; }
while ((read = fread(buf, 1, BS, from_f)) > 0) {
fwrite(buf, 1, read, to_f);
}
if (flags.verbose) {
output("copied '%s'", from);
}
return true;
}
static bool symlink_file(char* from, char* to) {
if (symlink(from, to) < 0) {
error_s("failed to symlink '%s'", from);
return false;
} else if (flags.verbose) {
output("symlinked '%s'", from);
}
return true;
}
static bool hardlink_file(char* from, char* to) {
if (link(from, to) < 0) {
error_s("failed to hardlink '%s'", from);
return false;
} else if (flags.verbose) {
output("hardlinked '%s'", from);
}
return true;
}
static void run_copy(struct stat* s) {
char* from = get_path_buffer();
char* to = get_path_buffer_2();
bool result;
if (flags.sym_link) {
result = symlink_file(from, to);
} else if (flags.hard_link) {
result = hardlink_file(from, to);
} else {
result = copy_file(from, to);
}
if (!result) return;
if (!flags.preserve) return;
if (chmod(to, s->st_mode) < 0) {
error_s("cannot chmod '%s'", to);
return;
}
if (chown(to, s->st_uid, s->st_gid) < 0) {
error_s("cannot chown '%s'", to);
return;
}
}
static void cp_file(char* path);
static void cp_directory(struct stat* s) {
DIR* d;
struct dirent* file;
if (!flags.recurse) {
error_s("-r not specified; omitting directory '%s'", get_path_buffer());
return;
}
if (mkdir(get_path_buffer_2(), s->st_mode) < 0 && errno != EEXIST) {
error_s("cannot create directory '%s'", get_path_buffer_2());
return;
}
d = opendir(get_path_buffer());
if (d == NULL) {
error_s("cannot open directory '%s'", get_path_buffer());
return;
}
while ((file = readdir(d)) != NULL) {
if (is_dot_dir(file->d_name)) continue;
cp_file(file->d_name);
}
}
static char* get_file_name(char* path) {
int last = 0;
int i = 0;
if (path[0] == '\0') return path;
while (true) {
if (path[i+1] == '\0') break;
if (path[i] == '/') {
last = i;
}
i++;
}
if (last == 0) return path;
else return path + last + 1;
}
static void cp_file(char* path) {
int save = push_path_buffer(path);
int save2 = push_path_buffer_2(get_file_name(path));
struct stat s;
if (lstat(get_path_buffer(), &s) < 0) {
pop_path_buffer(save);
error_s("cannot stat '%s'", get_path_buffer());
return;
}
if (S_ISDIR(s.st_mode)) {
cp_directory(&s);
} else {
run_copy(&s);
}
pop_path_buffer(save);
pop_path_buffer_2(save2);
}
COMMAND(cp) {
int start, i;
struct stat s;
flags.hard_link = false;
flags.sym_link = false;
flags.preserve = false;
flags.recurse = false;
flags.verbose = false;
start = parse_args(argc, argv, help, short_arg, NULL);
if (argc - start < 2) {
global_help(help);
}
/* only when 2 args and first is a file, the 2nd will be a file */
if (argc - start == 2) {
struct stat s;
if (lstat(argv[start], &s) < 0) {
error("cannot stat '%s'", argv[start]);
}
push_path_buffer(argv[argc-2]);
push_path_buffer_2(argv[argc-1]);
if (!S_ISDIR(s.st_mode)) {
run_copy(&s);
} else {
cp_directory(&s);
}
return EXIT_SUCCESS;
}
/* push directory */
push_path_buffer_2(argv[argc-1]);
if (lstat(get_path_buffer_2(), &s) < 0) {
error("target: '%s'", get_path_buffer_2());
}
for (i = start; i < argc - 1; i++) {
cp_file(argv[i]);
}
return EXIT_SUCCESS;
}
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