improve overall types

src/ls/Makefile

@@ -4,6 +4,5 @@ SRC := main.c
 SRC += list_directories.c
 SRC += print_info.c
 SRC += recursive_walk.c
-SRC += sort_entries.c
 
 include ../shared.mk

src/ls/list_directories.c

@@ -6,7 +6,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ -21,14 +20,12 @@ void get_file_info(const char *path, entry_t *entry)
     entry->group = getgrgid(entry->stat.st_gid);
 }
 
-static
-int read_directory(dirbuff_t *db, DIR *dir, char flags)
+static __attribute__((nonnull))
+size_t read_directory(dirbuff_t *db, DIR *dir, char flags)
 {
     static char path[PATH_MAX];
-    int i = 0;
+    size_t i = 0;
 
-    if (dir == NULL)
-        return -1;
     for (struct dirent *dirent = readdir(dir); dirent; dirent = readdir(dir)) {
         if (dirent->d_name[0] == '.' && ~flags & F_ALL_FILES)
             continue;
@@ -66,38 +63,44 @@ void print_error(char *dirname)
 }
 
 static
-int read_arg(dirbuff_t *db, char flags)
+int compare_names(entry_t const *leftp, entry_t const *rightp)
+{
+    return strcoll(leftp->name, rightp->name);
+}
+
+static
+int compare_times(entry_t const *leftp, entry_t const *rightp)
+{
+    return (int)(
+        rightp->stat.st_mtim.tv_sec
+        - leftp->stat.st_mtim.tv_sec
+    );
+}
+
+int list_dir(dirbuff_t *db, char flags)
 {
     struct stat fi;
-    int count = 1;
+    size_t count = 1;
     DIR *dir;
 
-    db->is_file = 0;
-    if (stat(db->name, &fi) < 0) {
-        print_error(db->name);
-        return -1;
-    }
-    if (S_ISDIR(fi.st_mode) && ~flags & F_DIRECTORY) {
+    if (stat(db->name, &fi) < 0)
+        return print_error(db->name), -1;
+
+    db->is_file = S_ISDIR(fi.st_mode) && ~flags & F_DIRECTORY;
+    if (db->is_file) {
         dir = opendir(db->name);
         count = read_directory(db, dir, flags);
         closedir(dir);
     } else {
         strcpy(db->entries[0].name, db->name);
         get_file_info(db->name, &db->entries[0]);
-        db->is_file = 1;
     }
-    return count;
-}
-
-int list_dir(dirbuff_t *db, char flags)
-{
-    int count = read_arg(db, flags);
 
-    if (count == -1)
-        return -1;
-    sort_entries(db->entries, count);
+    qsort(db->entries, count,
+        sizeof *db->entries, (__compar_fn_t)&compare_names);
     if (flags & F_SORT_TIME)
-        sort_entries_by_time(db->entries, count);
+        qsort(db->entries, count,
+            sizeof *db->entries, (__compar_fn_t)&compare_times);
     if (flags & (F_SHOW_DIRS | F_RECURSIVE) && !db->is_file)
         printf("%s:\n", db->name);
     print_entries(db->entries, count, flags);

src/ls/ls.h

@@ -1,6 +1,7 @@
 #ifndef MY_LS_H
     #define MY_LS_H
 
+    #include <stdbool.h>
     #include <stddef.h>
 
     #define ZERO_OR(expr, default) ((!!(expr)) * default)
@@ -33,28 +34,25 @@ typedef struct {
 typedef struct {
     char *name;
     entry_t *entries;
-    int size;
-    int is_file;
+    size_t size;
+    bool is_file;
 } dirbuff_t;
 
-inline
+inline __attribute__((const))
 int stridx(const char *str, char c)
 {
     for (const char *p = str; *p != '\0'; p++)
         if (*p == c)
-            return p - str;
+            return (int)(p - str);
     return -1;
 }
 
 char *strdup(char const *s);
 
 int list_dir(dirbuff_t *db, char flags);
-int recurse(dirbuff_t *db, int count, char flags);
+size_t recurse(dirbuff_t *db, size_t count, char flags);
 
-void print_entries(entry_t *entry, int count, char flags);
+void print_entries(entry_t *entry, size_t count, char flags);
 char *path_concat(char *dest, char *basepath, char *suffix);
 
-void sort_entries(entry_t *entries, int count);
-void sort_entries_by_time(entry_t *entries, int count);
-
 #endif

src/ls/main.c

@@ -2,8 +2,8 @@
 
 #include "ls.h"
 
-static const char *FLAGLIST = "alRdrt";
-static char DEFAULT_LOCATION[2] = ".";
+static const char FLAGLIST[] = "alRdrt";
+static char DEFAULT_LOCATION[] = ".";
 
 static
 char compose_flaglist(int argc, char **argv)

src/ls/print_info.c

@@ -12,22 +12,24 @@
 
 #include "ls.h"
 
+typedef unsigned char uchar;
+
 static
 void get_file_right(char bits[], entry_t *entry)
 {
     char *bitsp = bits;
     mode_t mode = entry->stat.st_mode;
     static const char *s = "-rwx";
 
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IRUSR, 1)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IWUSR, 2)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IXUSR, 3)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IRGRP, 1)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IWGRP, 2)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IXGRP, 3)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IROTH, 1)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IWOTH, 2)];
-    *bitsp++ = s[(unsigned char)ZERO_OR(mode & S_IXOTH, 3)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IRUSR, 1)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IWUSR, 2)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IXUSR, 3)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IRGRP, 1)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IWGRP, 2)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IXGRP, 3)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IROTH, 1)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IWOTH, 2)];
+    *bitsp++ = s[(uchar)ZERO_OR(mode & S_IXOTH, 3)];
     if (mode & S_ISUID)
         bits[1] = (mode & S_IXUSR) ? 's' : 'S';
     if (mode & S_ISGID)
@@ -56,11 +58,13 @@ char get_file_type(entry_t *entry)
 static
 char *get_creation_time(entry_t *entry)
 {
-    static char fmt[12];
+    static char fmt[sizeof("Jan 01 00:00")];
     char *ct = ctime(&entry->stat.st_mtim.tv_sec);
     time_t now = time(NULL);
     const int six_month_sec = 6 * 24 * 3600 * 31;
 
+    if (strlen(ct) < 24)
+        return NULL;
     if (entry->stat.st_mtim.tv_sec + six_month_sec < now) {
         strncpy(fmt, ct + 4, 7);
         strncpy(fmt + 7, ct + 19, 5);
@@ -73,9 +77,9 @@ static
 void print_file_infos(entry_t *entry)
 {
     struct stat *fi = &entry->stat;
-    char perms[10] = { [0] = get_file_type(entry) };
-    const char *owner = (entry->passwd == NULL) ? "?" : entry->passwd->pw_name;
-    const char *grp = (entry->group == NULL) ? "?" : entry->group->gr_name;
+    char perms[sizeof("-rwxr-xr-x")] = { [0] = get_file_type(entry) };
+    char const *owner = (entry->passwd == NULL) ? "?" : entry->passwd->pw_name;
+    char const *grp = (entry->group == NULL) ? "?" : entry->group->gr_name;
     char *time = get_creation_time(entry);
 
     get_file_right(perms + 1, entry);
@@ -87,7 +91,7 @@ void print_file_infos(entry_t *entry)
     printf(" %.12s ", time);
 }
 
-void print_entries(entry_t *entry, int count, char flags)
+void print_entries(entry_t *entry, size_t count, char flags)
 {
     int d;
 
@@ -96,7 +100,7 @@ void print_entries(entry_t *entry, int count, char flags)
         entry += (count - 1);
     } else
         d = 1;
-    for (int i = 0; i < count; i++) {
+    for (size_t i = 0; i < count; i++) {
         if (flags & F_LONG_FORM)
             print_file_infos(entry);
         printf("%s", entry->name);

src/ls/recursive_walk.c

@@ -5,7 +5,7 @@
 
 char *path_concat(char *dest, char *basepath, char *suffix)
 {
-    int written = 0;
+    unsigned long written = 0;
 
     strcpy(dest, basepath);
     written = strlen(basepath);
@@ -19,14 +19,12 @@ char *path_concat(char *dest, char *basepath, char *suffix)
     return dest;
 }
 
-static
-int find_directories(char **dirs, dirbuff_t *db, int count)
+static __attribute__((nonnull))
+size_t find_directories(char **dirs, dirbuff_t *db, size_t count)
 {
-    int found = 0;
+    size_t found = 0;
 
-    if (dirs == NULL)
-        return -1;
-    for (int i = 0; i < count; i++) {
+    for (size_t i = 0; i < count; i++) {
         if (!strcmp(db->entries[i].name, ".")
             || !strcmp(db->entries[i].name, ".."))
             continue;
@@ -38,21 +36,19 @@ int find_directories(char **dirs, dirbuff_t *db, int count)
     return found;
 }
 
-int recurse(dirbuff_t *db, int count, char flags)
+size_t recurse(dirbuff_t *db, size_t count, char flags)
 {
     static char path[PATH_MAX];
-    int dirsize = strlen(db->name);
+    size_t dirsize = strlen(db->name);
     char **dirs = malloc(count * sizeof(char *));
-    int j = find_directories(dirs, db, count);
+    size_t j = find_directories(dirs, db, count);
 
-    if (j == -1)
-        return -1;
-    for (int i = 0; i < j; i++) {
+    for (size_t i = 0; i < j; i++) {
         db->name = path_concat(path, db->name, dirs[i]);
         list_dir(db, flags);
         db->name[dirsize] = '\0';
     }
-    for (int i = 0; i < j; i++)
+    for (size_t i = 0; i < j; i++)
         free(dirs[i]);
     free(dirs);
     return 0;

src/ls/strdup.c

@@ -5,7 +5,7 @@
 
 char *strdup(char const *s)
 {
-    int len = strlen(s);
+    size_t len = strlen(s);
     char *dupped = malloc(len + 1);
 
     strcpy(dupped, s);