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/* SPDX-License-Identifier: Apache-2.0 */
/* Copyright 2025 Thorsten Töpper
*
* vim:ts=4:sw=4:expandtab
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <stdbool.h>
#include <ctype.h>
#include "output.h"
#include "options.h"
/* === GLOBAL VARIABLES === */
struct option long_options[] = {
{ "help", no_argument, 0, 0 },
{ "format-string", required_argument, 0, 0 },
{ "long-timestamp", no_argument, 0, 0 },
{ "print-header", no_argument, 0, 0 },
{ "reverse-sort", no_argument, 0, 0 },
{ "show-hidden-entries", no_argument, 0, 0 },
{ "sort-by", required_argument, 0, 0 },
{ "time-field", required_argument, 0, 0 },
{ 0, 0, 0, 0 }
};
bool option_sort_reverse_order = false;
enum esort_type option_sort_type = SORT_BY_SIZE;
bool option_print_header = false;
bool option_show_hidden_entries = false;
bool option_timestamp_long = false;
char *option_format_string = NULL;
/* There are three fields regarding time, valid values 'a','c', 'm':
* st_atime / st_atim.tv_sec - time of the last access
* st_ctime / st_ctim.tv_sec - time of the last change to the inode
* st_mtime / st_mtim.tv_sec - time of last modification of the content
*/
char option_time_field = 'm';
char *exec_name;
/* === IMPLEMENTATION === */
void usage(char *executable) {
fprintf(stderr, "Call: %s OPTIONS path_to_open\n", executable);
fprintf(stderr, "\nOPTIONS are\n");
/* long name, short name, optional argument, explanation */
fprintf(stderr, " %-25s %2s %10s - %s\n", "--help", "-h", "",
"Show this message and exit");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--format-string", "", "format",
"define columns to print, details below");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--long-timestamp", "-t", "",
"Print timestamp in long form yyyymmdd HH:MM:SS ZONE");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--print-header", "-H", "",
"Print a header above the columns");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--reverse-sort", "", "",
"Sort reversed");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--show-hidden-entries", "-a", "",
"Show hidden entries in the directory");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--sort-by", "", "variant",
"Sort either by size or time");
fprintf(stderr, " %-25s %2s %10s - %s\n", "--time-field", "", "a|c|m",
"Sort by (a)ccess, (c)hange or (m)odification time. Default: m");
/* fputc_width_x('-', 72, stderr); */
fprintf(stderr, "\n\n--sort-by variants: name | size | time\n");
fprintf(stderr, "\n--format-string: Characters unlike the following are ignored\n");
fprintf(stderr, " A - access time\n");
fprintf(stderr, " C - change time\n");
fprintf(stderr, " G - group name\n");
fprintf(stderr, " g - group id\n");
fprintf(stderr, " M - modification time\n");
fprintf(stderr, " n - file name\n");
fprintf(stderr, " p - permissions\n");
fprintf(stderr, " s - size\n");
fprintf(stderr, " T - type\n");
fprintf(stderr, " t - time defined by --time-field (default: modification time)\n");
fprintf(stderr, " U - user name\n");
fprintf(stderr, " u - user id\n");
}
void set_option(const char *option_name, char *option_argument) {
DBGTRC("DEBUG: called with option_name '%s' and option_argument '%s'\n",
option_name, option_argument);
if (option_name == NULL)
return;
/* options WITHOUT arguments */
if (strcmp("help", option_name) == 0) {
usage(exec_name);
exit(EXIT_SUCCESS);
}
if (strcmp("long-timestamp", option_name) == 0) {
option_timestamp_long = true;
return;
}
if (strcmp("reverse-sort", option_name) == 0) {
option_sort_reverse_order = true;
return;
}
if (strcmp("print-header", option_name) == 0) {
option_print_header = true;
return;
}
if (strcmp("show-hidden-entries", option_name) == 0) {
option_show_hidden_entries = true;
return;
}
/* options WITH arguments */
if (option_argument == NULL || option_argument[0] == '\0') {
LOGERR("ERROR: option_name %s with missing option_argument\n",
option_name);
exit(EXIT_FAILURE);
}
if (strcmp("format-string", option_name) == 0) {
option_format_string = option_argument;
return;
}
if (strcmp("sort-by", option_name) == 0) {
if (strncmp("name", option_argument, 4) == 0) {
option_sort_type = SORT_BY_NAME;
} else if (strncmp("size", option_argument, 4) == 0) {
option_sort_type = SORT_BY_SIZE;
} else if (strncmp("time", option_argument, 4) == 0) {
option_sort_type = SORT_BY_TIME;
} else {
LOGERR("WARNING: '%s' is an invalid argument for %s\n",
option_argument, option_name);
}
return;
}
if (strcmp("time-field", option_name) == 0) {
switch (option_argument[0]) {
case 'a':
option_time_field = 'a';
break;
case 'c':
option_time_field = 'c';
break;
case 'm':
option_time_field = 'm';
break;
default:
/* Keep in mind: isgraph ignores space, but an explicit call --time-field ' ' is strange */
LOGERR("WARNING: --time-field: invalid value %c 0x%02X - falling back to default m\n",
((isgraph(option_argument[0])) ? option_argument[0] : ' '), option_argument[0]);
option_time_field = 'm';
break;
};
return;
}
LOGERR("ERROR: Option '%s' not recognized\n.", option_name);
}
int parse_arguments(int argc, char **argv) {
int c = 0, index;
/* exec_name is a file internal global variable for --help in set_option() */
exec_name = argv[0];
while(1) {
index = 0;
c = getopt_long(argc, argv, "aHht", long_options, &index);
if (c == -1) {
break;
}
switch (c) {
case 0:
set_option(long_options[index].name, optarg);
break;
case 'h':
usage(exec_name);
exit(EXIT_SUCCESS);
case 'H':
option_print_header = true;
break;
case 't':
option_timestamp_long = true;
break;
case 'a':
option_show_hidden_entries = true;
break;
case '?':
break;
default:
LOGERR("ERROR: unrecognized option 0x%02X '%c'\n", c, c);
usage(exec_name);
exit(EXIT_FAILURE);
}
}
return optind;
}
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