add ls; simpler pwd
This commit is contained in:
Connor Lane Smith
212
ls.c
Normal file
212
ls.c
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@@ -0,0 +1,212 @@
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/* See LICENSE file for copyright and license details. */
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#include <dirent.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "util.h"
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typedef struct {
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char *name;
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mode_t mode;
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nlink_t nlink;
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uid_t uid;
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gid_t gid;
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off_t size;
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time_t mtime;
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} Entry;
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static int entcmp(Entry *, Entry *);
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static void ls(char *, bool);
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static void lsdir(const char *);
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static void mkent(Entry *, char *);
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static void output(Entry *);
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static bool aflag = false;
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static bool lflag = false;
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static bool tflag = false;
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static bool many;
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int
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main(int argc, char *argv[])
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{
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bool dflag = false;
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char c;
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while((c = getopt(argc, argv, "adlt")) != -1)
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switch(c) {
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case 'a':
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aflag = true;
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break;
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case 'd':
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dflag = true;
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break;
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case 'l':
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lflag = true;
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break;
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case 't':
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tflag = true;
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break;
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default:
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exit(EXIT_FAILURE);
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}
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many = (argc > optind+1);
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if(optind == argc)
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ls(".", !dflag);
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else for(; optind < argc; optind++)
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ls(argv[optind], !dflag);
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return EXIT_SUCCESS;
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}
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int
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entcmp(Entry *a, Entry *b)
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{
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if(tflag)
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return b->mtime - a->mtime;
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else
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return strcmp(a->name, b->name);
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}
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void
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ls(char *path, bool expand)
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{
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Entry ent;
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mkent(&ent, path);
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if(expand && S_ISDIR(ent.mode))
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lsdir(path);
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else
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output(&ent);
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}
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void
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lsdir(const char *path)
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{
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char *buf, *p;
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long i, n = 0;
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struct dirent *d;
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DIR *dp;
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Entry *ents = NULL;
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buf = agetcwd();
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if(!(dp = opendir(path)))
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eprintf("opendir %s:", path);
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if(chdir(path) != 0)
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eprintf("chdir %s:", path);
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while((d = readdir(dp))) {
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if(d->d_name[0] == '.' && !aflag)
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continue;
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if(!(ents = realloc(ents, ++n * sizeof *ents)))
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eprintf("realloc:");
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if(!(p = strdup(d->d_name)))
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eprintf("strdup:");
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mkent(&ents[n-1], p);
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}
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closedir(dp);
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qsort(ents, n, sizeof *ents, (int (*)(const void *, const void *))entcmp);
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if(many)
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printf("%s:\n", path);
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for(i = 0; i < n; i++) {
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output(&ents[i]);
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free(ents[i].name);
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}
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if(chdir(buf) != 0)
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eprintf("chdir %s:", buf);
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free(ents);
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free(buf);
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}
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void
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mkent(Entry *ent, char *path)
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{
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struct stat st;
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if(lstat(path, &st) != 0)
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eprintf("lstat %s:", path);
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ent->name = path;
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ent->mode = st.st_mode;
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ent->nlink = st.st_nlink;
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ent->uid = st.st_uid;
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ent->gid = st.st_gid;
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ent->size = st.st_size;
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ent->mtime = st.st_mtime;
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}
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void
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output(Entry *ent)
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{
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char buf[BUFSIZ], mode[11], *fmt;
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struct group *gr;
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struct passwd *pw;
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if(!lflag) {
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puts(ent->name);
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return;
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}
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if(S_ISREG(ent->mode))
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mode[0] = '-';
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else if(S_ISBLK(ent->mode))
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mode[0] = 'b';
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else if(S_ISCHR(ent->mode))
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mode[0] = 'c';
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else if(S_ISDIR(ent->mode))
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mode[0] = 'd';
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else if(S_ISFIFO(ent->mode))
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mode[0] = 'p';
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else if(S_ISLNK(ent->mode))
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mode[0] = 'l';
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else if(S_ISSOCK(ent->mode))
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mode[0] = 's';
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else
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mode[0] = '?';
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mode[1] = (ent->mode & S_IRUSR) ? 'r' : '-';
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mode[2] = (ent->mode & S_IWUSR) ? 'w' : '-';
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if(ent->mode & S_ISUID)
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mode[3] = (ent->mode & S_IXUSR) ? 's' : 'S';
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else
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mode[3] = (ent->mode & S_IXUSR) ? 'x' : '-';
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mode[4] = (ent->mode & S_IRGRP) ? 'r' : '-';
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mode[5] = (ent->mode & S_IWGRP) ? 'w' : '-';
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if(ent->mode & S_ISGID)
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mode[6] = (ent->mode & S_IXGRP) ? 's' : 'S';
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else
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mode[6] = (ent->mode & S_IXGRP) ? 'x' : '-';
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mode[7] = (ent->mode & S_IROTH) ? 'r' : '-';
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mode[8] = (ent->mode & S_IWOTH) ? 'w' : '-';
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mode[9] = (ent->mode & S_IXOTH) ? 'x' : '-';
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mode[10] = '\0';
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errno = 0;
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pw = getpwuid(ent->uid);
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if(errno)
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eprintf("getpwuid %d:", ent->uid);
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else if(!pw)
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eprintf("getpwuid %d: no such user\n", ent->uid);
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errno = 0;
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gr = getgrgid(ent->gid);
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if(errno)
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eprintf("getgrgid %d:", ent->gid);
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else if(!gr)
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eprintf("getgrgid %d: no such group\n", ent->gid);
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if(time(NULL) > ent->mtime + (180*24*60*60)) /* 6 months ago? */
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fmt = "%b %d %Y";
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else
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fmt = "%b %d %H:%M";
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strftime(buf, sizeof buf, fmt, localtime(&ent->mtime));
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printf("%s %2d %s %s %6lu %s %s\n", mode, ent->nlink, pw->pw_name, gr->gr_name, (unsigned long)ent->size, buf, ent->name);
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}
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