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#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
int
recursive_list_dirs(const char *directory)
{
DIR *dir = opendir(directory);
if(dir == NULL) {
fprintf(stderr, "ls: %s: %s\n", directory, strerror(errno));
return 1;
}
struct dirent *ent;
while((ent = readdir(dir)) != NULL) {
if(ent->d_type == DT_DIR) {
char path[1024];
if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
continue;
snprintf(path, sizeof(path), "%s/%s", directory, ent->d_name);
printf("%s/%s\n", path, ent->d_name);
recursive_list_dirs(path);
} else
printf("%s\n", ent->d_name);
}
closedir(dir);
return 0;
}
int
main(int argc, char *argv[])
{
int c;
int all, show_slash, show_line, show_suffix, recursive;
all = show_slash = show_line = show_suffix = recursive = 0;
while((c = getopt(argc, argv, "1FRahlp")) != -1) {
switch(c) {
case '1':
show_line = 1;
break;
case 'F':
show_suffix = 1;
show_slash = 1;
break;
case 'R':
recursive = 1;
break;
case 'a':
all = 1;
break;
case 'h':
printf("usage: ls [-1FRalp] [file...]\n");
return 0;
case 'l':
show_line = 1;
break;
case 'p':
show_slash = 1;
break;
}
}
for(; optind < argc; optind++) {
char directory[256];
if(!argv[optind])
strcpy(directory, "./");
else
strcpy(directory, argv[optind]); /* Very dirty code, i'll fix it
* later */
DIR *dir = opendir(directory);
if(dir == NULL) {
/* maybe we were given a file? */
fprintf(stderr, "ls: %s: %s\n", directory, strerror(errno));
continue;
}
struct dirent *ent;
if(recursive) {
recursive_list_dirs(directory);
return 0;
}
char suffix, separator;
suffix = separator = 0;
if(!show_line && isatty(STDOUT_FILENO))
separator = ' ';
else
separator = '\n';
if(dir != NULL) {
while((ent = readdir(dir)) != NULL) {
suffix = 0;
if(ent->d_name[0] == '.' && !all)
continue;
if(show_slash && ent->d_type == DT_DIR)
suffix = '/';
if(show_suffix) {
switch(ent->d_type) {
case DT_REG:
/* check if executable */
; /* statement after label */
struct stat st;
if(fstatat(dirfd(dir),
ent->d_name,
&st,
AT_SYMLINK_NOFOLLOW) < 0) {
fprintf(stderr,
"ls: %s: %s\n",
ent->d_name,
strerror(errno));
return 1;
}
if((st.st_mode & S_IEXEC) != 0)
suffix = '*';
break;
case DT_FIFO:
suffix = '|';
break;
case DT_LNK:
suffix = '@';
break;
case DT_SOCK:
suffix = '=';
break;
}
}
if(suffix != 0)
printf("%s%c%c", ent->d_name, suffix, separator);
else
printf("%s%c", ent->d_name, separator);
}
}
puts("");
closedir(dir);
}
return 0;
}
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