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sfm.c
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sfm.c
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/* See LICENSE file for copyright and license details. */
#if defined(__linux__)
#define _GNU_SOURCE
#include <sys/inotify.h>
#include <sys/types.h>
#define EV_BUF_LEN (1024 * (sizeof(struct inotify_event) + 16))
#define OFF_T "%ld"
#define M_TIME st_mtim
#elif defined(__APPLE__)
#define _DARWIN_C_SOURCE
#include <sys/types.h>
#include <sys/time.h>
#include <sys/event.h>
#include <fcntl.h>
#include <limits.h>
#define OFF_T "%lld"
#define M_TIME st_mtimespec
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
#define __BSD_VISIBLE 1
#include <sys/types.h>
#include <sys/time.h>
#include <sys/event.h>
#include <fcntl.h>
#include <limits.h>
#define OFF_T "%ld"
#define M_TIME st_mtim
#elif defined(__OpenBSD__)
#include <sys/types.h>
#include <sys/time.h>
#include <sys/event.h>
#include <fcntl.h>
#define OFF_T "%lld"
#define M_TIME st_mtim
#endif
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pthread.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include "sfm.h"
#include "config.h"
/* global variables */
static Terminal term;
static Pane *current_pane;
static Pane panes[2];
static int pane_idx;
char *editor[2] = { "vi", NULL };
char *shell[2] = { "/bin/sh", NULL };
char *home = "/";
static pid_t fork_pid, main_pid;
static char **selected_entries = NULL;
static int selected_count = 0;
static int mode;
static void
log_to_file(const char *func, int line, const char *format, ...)
{
pid_t pid = getpid();
FILE *logfile = fopen("/tmp/sfm.log", "a");
if (logfile) {
va_list args;
va_start(args, format);
fprintf(logfile, "%d-- [%s:%d] ", pid, func, line);
vfprintf(logfile, format, args);
va_end(args);
fprintf(logfile, "\n");
if (fclose(logfile) != 0) {
fprintf(stderr, "Error closing log file\n");
}
} else {
fprintf(stderr, "Error opening log file\n");
}
}
static void
init_term(void)
{
get_term_size();
term.buffer_size = (unsigned long)term.rows * term.cols * 4;
term.buffer = ecalloc(term.buffer_size, sizeof(char));
term.buffer_left = term.buffer_size;
term.buffer_index = 0;
}
static void
enable_raw_mode(void)
{
tcgetattr(STDIN_FILENO, &term.orig);
term.newterm = term.orig;
term.newterm.c_lflag &= ~(ECHO | ICANON | ISIG);
term.newterm.c_iflag &= ~(IXON | ICRNL);
term.newterm.c_oflag &= ~(OPOST);
term.newterm.c_cflag |= (CS8);
tcsetattr(STDIN_FILENO, TCSAFLUSH, &term.newterm);
if (write(STDOUT_FILENO, "\x1b[?1049h", 8) < 0)
die("write:");
}
static void
get_term_size(void)
{
struct winsize ws;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
term.rows = ws.ws_row;
term.cols = ws.ws_col;
}
static void
get_env(void)
{
char *env_editor = NULL;
char *env_shell = NULL;
char *env_home = NULL;
env_editor = getenv("EDITOR");
if (env_editor != NULL)
editor[0] = env_editor;
env_shell = getenv("SHELL");
if (env_shell != NULL)
shell[0] = env_shell;
env_home = getenv("HOME");
if (env_home != NULL)
home = env_home;
}
static int
start_signal(void)
{
struct sigaction sa;
main_pid = getpid();
sa.sa_handler = sighandler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &sa, 0);
sigaction(SIGUSR2, &sa, 0);
sigaction(SIGWINCH, &sa, 0);
return 0;
}
static void
sighandler(int signo)
{
if (fork_pid > 0) /* while forking ignore signals */
return;
switch (signo) {
case SIGWINCH:
log_to_file(__func__, __LINE__, "SIGWINCH");
termb_resize();
break;
case SIGUSR1:
log_to_file(__func__, __LINE__, "SIGUSR1");
set_pane_entries(&panes[Left]);
update_screen();
break;
case SIGUSR2:
log_to_file(__func__, __LINE__, "SIGUSR2");
set_pane_entries(&panes[Right]);
update_screen();
break;
default:
break;
}
}
static void
set_panes(void)
{
char cwd[PATH_MAX];
if ((getcwd(cwd, sizeof(cwd)) == NULL))
strncpy(cwd, home, PATH_MAX - 1);
strncpy(panes[Left].path, cwd, PATH_MAX - 1);
panes[Left].entries = NULL;
panes[Left].entry_count = 0;
panes[Left].start_index = 0;
panes[Left].current_index = 0;
panes[Left].watcher.fd = -1;
panes[Left].watcher.signal = SIGUSR1;
panes[Left].offset = 0;
strncpy(panes[Right].path, home, PATH_MAX - 1);
panes[Right].entries = NULL;
panes[Right].entry_count = 0;
panes[Right].start_index = 0;
panes[Right].current_index = 0;
panes[Right].watcher.fd = -1;
panes[Right].watcher.signal = SIGUSR2;
panes[Right].offset = term.cols / 2;
pane_idx = Left; /* cursor pane */
current_pane = &panes[pane_idx];
set_pane_entries(&panes[Left]);
set_pane_entries(&panes[Right]);
}
static void
set_pane_entries(Pane *pane)
{
int fd, i;
DIR *dir;
char tmpfull[PATH_MAX];
const struct dirent *entry;
struct stat status;
if (pane->entries != NULL) {
free(pane->entries);
pane->entries = NULL;
}
fd = open(pane->path, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
if (fd < 0) {
print_status(color_err, strerror(errno));
return;
}
dir = fdopendir(fd);
if (dir == NULL) {
close(fd);
print_status(color_err, strerror(errno));
return;
}
pane->entry_count = 0;
while ((entry = readdir(dir)) != NULL) {
if (should_skip_entry(entry) == 0) {
pane->entry_count++;
}
}
pane->entries = ecalloc(pane->entry_count, sizeof(Entry));
rewinddir(dir);
i = 0;
while ((entry = readdir(dir)) != NULL) {
if (should_skip_entry(entry) == 1) {
continue;
}
get_fullpath(tmpfull, pane->path, entry->d_name);
if (i >= pane->entry_count) {
log_to_file(__func__, __LINE__,
"Entry count exceeded allocated memory");
break;
}
// file deleted while getting its details
if (lstat(tmpfull, &status) != 0) {
log_to_file(__func__, __LINE__,
"lstat error for %s: %s", tmpfull,
strerror(errno));
memset(&pane->entries[i], 0, sizeof(Entry));
strncpy(pane->entries[i].fullpath, tmpfull,
PATH_MAX - 1);
strncpy(pane->entries[i].name, entry->d_name,
NAME_MAX - 1);
i++;
continue;
}
size_t fullpath_len = strlen(tmpfull);
size_t name_len = strlen(entry->d_name);
memcpy(pane->entries[i].fullpath, tmpfull, fullpath_len);
pane->entries[i].fullpath[fullpath_len] = '\0';
memcpy(pane->entries[i].name, entry->d_name, name_len);
pane->entries[i].name[name_len] = '\0';
pane->entries[i].st = status;
set_entry_color(&pane->entries[pane->start_index + i]);
i++;
}
pane->entry_count = i;
if (closedir(dir) < 0)
die("closedir:");
qsort(pane->entries, pane->entry_count, sizeof(Entry), entry_compare);
}
static int
should_skip_entry(const struct dirent *entry)
{
if (entry->d_name[0] == '.') {
if (entry->d_name[1] == '\0' ||
(entry->d_name[1] == '.' && entry->d_name[2] == '\0'))
return 1;
if (show_dotfiles != 1)
return 1;
}
return 0;
}
static void
get_fullpath(char *full_path, const char *first, const char *second)
{
int ret;
if (first[0] == '/' && first[1] == '\0')
(void)snprintf(full_path, PATH_MAX, "/%s", second);
ret = snprintf(full_path, PATH_MAX, "%s/%s", first, second);
if (ret < 0)
die(strerror(errno));
if (ret >= PATH_MAX)
die("Path exceeded maximum length");
}
static int
get_selected_paths(Pane *pane, char **result)
{
int count = 0;
for (int i = 0; i < pane->entry_count; i++) {
if (pane->entries[i].selected) {
result[count] = pane->entries[i].fullpath;
count++;
}
}
return count;
}
// static int
// entry_compare(const void *const A, const void *const B)
// {
// int result;
// mode_t data1 = (*(Entry *)A).st.st_mode;
// mode_t data2 = (*(Entry *)B).st.st_mode;
//
// if (data1 < data2) {
// return -1;
// } else if (data1 == data2) {
// result = strncmp(
// (*(Entry *)A).name, (*(Entry *)B).name, NAME_MAX);
// return result;
// } else {
// return 1;
// }
// }
static int
entry_compare(const void *a, const void *b)
{
const Entry *entryA = (const Entry *)a;
const Entry *entryB = (const Entry *)b;
if (!entryA || !entryB) {
return 0;
}
mode_t modeA = entryA->st.st_mode;
mode_t modeB = entryB->st.st_mode;
if (modeA < modeB) {
return -1;
} else if (modeA == modeB) {
return strncmp(entryA->name, entryB->name, NAME_MAX);
} else {
return 1;
}
}
static void
update_screen(void)
{
// clear all except last line
write(STDOUT_FILENO, "\x1b[F\x1b[A\x1b[999C\x1b[1J", 16);
append_entries(&panes[Left]);
append_entries(&panes[Right]);
termb_write();
write_entries_name();
log_to_file(__func__, __LINE__, "err: (%d)", errno);
if (mode == NormalMode && errno == 0)
display_entry_details();
else
print_status(color_err, strerror(errno));
}
static void
disable_raw_mode(void)
{
tcsetattr(STDIN_FILENO, TCSAFLUSH, &term.orig);
if (write(STDOUT_FILENO, "\x1b[?1049l", 8) < 0)
die("write:");
}
static void
append_entries(Pane *pane)
{
int i;
int n = 0;
size_t index = 0;
size_t max_len = term.cols / 2;
Entry entry;
char *buffer;
if (pane->entries == NULL) {
return;
}
buffer = ecalloc(term.buffer_size, sizeof(char));
termb_append("\x1b[2;1f", 6); // move to top left
for (i = 0;
i < term.rows - 2 && pane->start_index + i < pane->entry_count;
i++) {
if (pane->start_index + i >= pane->entry_count ||
pane->entries == NULL) {
continue;
}
entry = pane->entries[pane->start_index + i];
/* selected entry */
if (pane->entries[i].selected == 1)
entry.color = color_selected;
/* current entry */
if (pane == current_pane &&
pane->start_index + i == pane->current_index) {
entry.color.attr |= RVS;
}
// Format the entry with truncation and padding
n = snprintf(buffer + index, term.buffer_size - index,
"\x1b[%dG"
"\x1b[%d;38;5;%d;48;5;%dm%-*.*s\x1b[0m\r\n",
pane->offset, entry.color.attr, entry.color.fg,
entry.color.bg, (int)max_len, (int)max_len, entry.name);
if (n < 0)
break;
index += n;
}
termb_append(buffer, index);
free(buffer);
buffer = NULL;
}
static void
handle_keypress(char c)
{
log_to_file(__func__, __LINE__, "key: (%c)", c);
grabkeys(c, nkeys, nkeyslen);
}
static void
grabkeys(uint32_t k, Key *key, size_t max_keys)
{
size_t i;
for (i = 0; i < max_keys; i++) {
if (k == key[i].k) {
key[i].func(&key[i].arg);
return;
}
}
print_status(color_err, "No key binding found for key 0x%x", k);
}
static void
print_status(ColorPair color, const char *fmt, ...)
{
char buf[term.cols];
int buf_len;
size_t max_result_size;
size_t result_len;
va_list vl;
va_start(vl, fmt);
buf_len = vsnprintf(buf, term.cols, fmt, vl);
va_end(vl);
max_result_size = 5 + UINT16_LEN + 4 + 15 + UINT8_LEN + UINT8_LEN +
UINT8_LEN + buf_len + 6 + 1;
char result[max_result_size];
result_len = snprintf(result, max_result_size,
"\x1b[%d;1f" // moves cursor to last line, column 1
"\x1b[2K" // erase the entire line
"\x1b[%d;38;5;%d;48;5;%dm" // set string colors
"%s"
"\x1b[0;0m", // reset colors
term.rows, color.attr, color.fg, color.bg, buf);
if (write(STDOUT_FILENO, result, result_len) < 0)
die("write:");
}
static void
display_entry_details(void)
{
char sz[FSIZE_MAX];
char ur[USER_MAX];
char gr[GROUP_MAX];
char dt[DATETIME_MAX];
char prm[PERMISSION_MAX];
struct stat st;
if (current_pane == NULL || current_pane->entries == NULL ||
current_pane->entry_count < 1) {
print_status(color_warn, "Empty directory.");
return;
}
if (current_pane->current_index >= current_pane->entry_count) {
return;
}
st = current_pane->entries[current_pane->current_index].st;
get_entry_permission(prm, st.st_mode);
get_entry_owner(ur, st.st_uid);
get_entry_group(gr, st.st_gid);
get_entry_datetime(dt, st.M_TIME.tv_sec);
get_file_size(sz, st.st_size);
print_status(color_status, "%02d/%02d %s %s:%s %s %s",
current_pane->current_index + 1, current_pane->entry_count, prm,
ur, gr, dt, sz);
}
static void
set_entry_color(Entry *ent)
{
if (ent->selected) {
ent->color = color_selected;
return;
} else if (ent->matched) {
ent->color = color_search;
return;
}
switch (ent->st.st_mode & S_IFMT) {
case S_IFREG:
ent->color = color_file;
if ((S_IXUSR | S_IXGRP | S_IXOTH) & ent->st.st_mode)
ent->color = color_exec;
break;
case S_IFDIR:
ent->color = color_dir;
break;
case S_IFLNK:
ent->color = color_lnk;
break;
case S_IFBLK:
ent->color = color_blk;
break;
case S_IFCHR:
ent->color = color_chr;
break;
case S_IFIFO:
ent->color = color_ifo;
break;
case S_IFSOCK:
ent->color = color_sock;
break;
default:
ent->color = color_other;
break;
}
}
static void
get_entry_datetime(char *buf, time_t status)
{
struct tm lt;
localtime_r(&status, <);
strftime(buf, DATETIME_MAX, "%Y-%m-%d %H:%M", <);
buf[DATETIME_MAX - 1] = '\0';
}
static void
get_entry_permission(char *buf, mode_t mode)
{
size_t i = 0;
const char chars[] = "rwxrwxrwx";
if (S_ISDIR(mode))
buf[0] = 'd';
else if (S_ISREG(mode))
buf[0] = '-';
else if (S_ISLNK(mode))
buf[0] = 'l';
else if (S_ISBLK(mode))
buf[0] = 'b';
else if (S_ISCHR(mode))
buf[0] = 'c';
else if (S_ISFIFO(mode))
buf[0] = 'p';
else if (S_ISSOCK(mode))
buf[0] = 's';
else
buf[0] = '?';
for (i = 1; i < PERMISSION_MAX; i++) {
buf[i] = (mode & (1 << (9 - i))) ? chars[i - 1] : '-';
}
buf[PERMISSION_MAX - 1] = '\0';
}
static void
get_file_size(char *buf, off_t size)
{
char unit;
int counter = 0;
while (size >= 1024) {
size >>= 10;
++counter;
}
switch (counter) {
case 0:
unit = 'B';
break;
case 1:
unit = 'K';
break;
case 2:
unit = 'M';
break;
case 3:
unit = 'G';
break;
case 4:
unit = 'T';
break;
default:
unit = '?';
}
if (snprintf(buf, FSIZE_MAX, OFF_T "%c", size, unit) < 0)
print_status(color_err, strerror(errno));
}
static void
get_entry_owner(char *buf, const uid_t uid)
{
const struct passwd *pw;
pw = getpwuid(uid);
if (pw == NULL) {
snprintf(buf, USER_MAX, "%u", uid);
} else {
strncpy(buf, pw->pw_name, USER_MAX - 1);
buf[GROUP_MAX - 1] = '\0';
}
}
static void
get_entry_group(char *buf, const gid_t gid)
{
const struct group *gr;
gr = getgrgid(gid);
if (gr == NULL) {
snprintf(buf, GROUP_MAX, "%u", gid);
} else {
strncpy(buf, gr->gr_name, GROUP_MAX - 1);
buf[GROUP_MAX - 1] = '\0';
}
}
static int
get_user_input(char *input, size_t size, const char *prompt, ...)
{
va_list args;
char msg[PROMPT_MAX];
int c;
size_t index = 0;
va_start(args, prompt);
vsnprintf(msg, PROMPT_MAX, prompt, args);
print_status(color_normal, msg);
va_end(args);
while (1) {
c = getchar();
switch (c) {
case XK_ESC:
display_entry_details();
return -1;
case XK_ENTER:
input[index] = '\0';
//display_entry_details();
return 0;
case XK_BACKSPACE:
if (index > 0) {
index--;
printf("\b \b");
}
break;
default:
if (index < size - 1) {
input[index++] = c;
putchar(c);
}
break;
}
}
return 0;
}
static int
check_dir(char *path)
{
DIR *dir;
dir = opendir(path);
if (dir == NULL) {
if (errno == ENOTDIR) {
return 1;
} else {
return -1;
}
}
if (closedir(dir) < 0)
return -1;
return 0;
}
static void
open_file(char *file)
{
char *ext;
int rule_index;
Command cmd;
ext = get_file_extension(file);
rule_index = -1;
if (ext != NULL) {
rule_index = check_rule(ext);
free(ext);
ext = NULL;
}
if (rule_index < 0) {
cmd.cmdv = editor;
cmd.cmdc = 1;
cmd.argv = &file;
cmd.argc = 1;
cmd.wait_exec = Wait;
} else {
cmd.cmdv = (char **)rules[rule_index].v;
cmd.cmdc = rules[rule_index].vlen;
cmd.argv = &file;
cmd.argc = 1;
cmd.wait_exec = rules[rule_index].wait_exec;
}
spawn(&cmd);
}
static char *
get_file_extension(const char *str)
{
char *ext;
const char *dot;
if (!str)
return NULL;
dot = strrchr(str, '.');
if (!dot || dot == str)
return NULL;
ext = ecalloc(EXTENTION_MAX + 1, sizeof(char));
strncpy(ext, dot + 1, EXTENTION_MAX);
for (char *p = ext; *p; p++)
*p = tolower((unsigned char)*p);
return ext;
}
static int
check_rule(const char *ex)
{
size_t c, d;
for (c = 0; c < LEN(rules); c++)
for (d = 0; d < rules[c].exlen; d++)
if (strncmp(rules[c].ext[d], ex, EXTENTION_MAX) == 0)
return c;
return -1;
}
static void
spawn(Command *cmd)
{
int execvp_errno;
if (cmd->wait_exec == Wait)
disable_raw_mode();
execvp_errno = execute_command(cmd);
if (cmd->wait_exec == Wait) {
enable_raw_mode();
termb_resize();
}
switch (execvp_errno) {
case 0:
break;
case ENOENT:
print_status(color_err, "Command not found: %s", cmd->cmdv[0]);
break;
case EACCES:
print_status(color_err, "Permission denied: %s", cmd->argv[0]);
break;
case E2BIG:
print_status(
color_err, "Argument list too long: %s", cmd->argv[0]);
break;
case EFAULT:
print_status(color_err, "Bad address: %s", cmd->argv[0]);
break;
case EIO:
print_status(color_err, "I/O error: %s", cmd->argv[0]);
break;
case ENOEXEC:
print_status(color_err, "Exec format error: %s", cmd->argv[0]);
break;
case ENOMEM:
print_status(color_err, "Out of memory: %s", cmd->argv[0]);
break;
case ENOTDIR:
print_status(color_err, "Not a directory: %s", cmd->argv[0]);
break;
case ETXTBSY:
print_status(color_err, "Text file busy: %s", cmd->argv[0]);
break;
case EPERM:
print_status(
color_err, "Operation not permitted: %s", cmd->argv[0]);
break;
case ELOOP:
print_status(color_err,
"Too many symbolic links encountered: %s",
cmd->argv[0]);
break;
case ENAMETOOLONG:
print_status(color_err, "File name too long: %s", cmd->argv[0]);
break;
case ENFILE:
print_status(
color_err, "File table overflow: %s", cmd->argv[0]);
break;
case ENODEV:
print_status(color_err, "No such device: %s", cmd->argv[0]);
break;
case ENOLCK:
print_status(color_err, "No locks available: %s", cmd->argv[0]);
break;
case ENOSYS:
print_status(color_err, "Function not implemented: %s",
cmd->argv[0]);
break;
case ENOTBLK:
print_status(
color_err, "Block device required: %s", cmd->argv[0]);
break;
case EISDIR:
print_status(color_err, "Is a directory: %s", cmd->argv[0]);
break;
case EROFS:
print_status(
color_err, "Read-only file system: %s", cmd->argv[0]);
break;
case EMFILE:
print_status(
color_err, "Too many open files: %s", cmd->argv[0]);
break;
default:
print_status(color_err, "execvp failed with errno: %d",
execvp_errno);
break;
}
errno = 0;
}
static int
execute_command(Command *cmd)
{
size_t argc;
char **argv;
char log_command[99024];
size_t pos;
int wait_status;
int exit_status = 0;
int exit_errno = 0;
argc = cmd->cmdc + cmd->argc + 2;
argv = ecalloc(argc, sizeof(char *));
memcpy(argv, cmd->cmdv, cmd->cmdc * sizeof(char *));
memcpy(&argv[cmd->cmdc], cmd->argv, cmd->argc * sizeof(char *));
argv[argc - 1] = NULL;
// Construct the command string for logging
log_command[0] = '\0'; // Initialize the string with null terminator
pos = 0;
for (size_t i = 0; i < argc - 1; ++i) {
if (argv[i] != NULL) {
int len = snprintf(log_command + pos,
sizeof(log_command) - pos, "%s ", argv[i]);
if (len < 0 || pos + len >= sizeof(log_command)) {
break; // Avoid buffer overflow
}
pos += len;
}
}
log_command[sizeof(log_command) - 1] = '\0'; // Ensure null-termination
log_to_file(__func__, __LINE__, "exec = %s", log_command);
fork_pid = fork();
switch (fork_pid) {
case -1:
free(argv);
argv = NULL;
return -1;
case 0:
exit_status = execvp(argv[0], argv);
if (exit_status < 0) {
free(argv);
argv = NULL;
}
exit(errno);
default:
waitpid(fork_pid, &wait_status, cmd->wait_exec);
if (WIFEXITED(wait_status) && WEXITSTATUS(wait_status)) {
exit_errno = WEXITSTATUS(wait_status);
}
}
free(argv);
argv = NULL;
fork_pid = 0;
return exit_errno;
}
static void
termb_append(const char *str, size_t len)
{
if (len >= term.buffer_left) {
term.buffer = erealloc(term.buffer, term.buffer_size * 2);
term.buffer_size *= 2;
}
memcpy(&term.buffer[term.buffer_index], str, len);
term.buffer_index += len;
term.buffer_left = term.buffer_size - term.buffer_index;
}
static void
termb_write(void)