Initial commit

Author: Neved4

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.c]
+indent_style = tab
+indent_size = 4

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2023 Neveda
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

twc.c

@@ -0,0 +1,129 @@
+#define _POSIX_C_SOURCE 200809L
+#define TIMEFMT_DEFAULT TIMEFMT_ISO
+#define STR_LENGTH 32
+
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+enum {
+	TIMEFMT_ISO,
+	TIMEFMT_HUMAN,
+	NTIMEFMT
+};
+
+const char *time_fmts[NTIMEFMT] = {
+	"%FT%T%z",
+	"%F  %T  %z"
+};
+
+static void usage(const char *s) {
+	fprintf(stderr, "usage: %s [-h] ...\n", s);
+	exit(EXIT_FAILURE);
+}
+
+static void err_env(void) {
+	fprintf(stderr, "error: could not get the value of the $HOME variable");
+	exit(EXIT_FAILURE);
+}
+
+static void err_file(const char *s) {
+	fprintf(stderr, "error: configuration file not found in %s\n", s);
+	exit(EXIT_FAILURE);
+}
+
+static void fparse(const char *s) {
+	int hc = 0;
+	char timestr[STR_LENGTH];
+	char *nl = NULL;
+	char *sep = NULL;
+	char *line = NULL;
+	char *path = NULL;
+	char *conf = "/.config";
+	char *home = getenv("XDG_CONFIG_HOME");
+	char *file = "/twc/tz.conf";
+	FILE *fp;
+
+	if (home == NULL || *home == '\0') {
+		hc = 1;
+		home = getenv("HOME");
+
+		if (home == NULL || *home == '\0') {
+			err_env();
+		}
+	}
+
+	size_t sizet = strlen(home) + strlen(file);
+	path = (char *) malloc(sizet);
+	strcpy(path, home);
+
+	if (hc == 1) {
+		sizet += strlen(conf);
+		path = (char *) realloc(path, sizet);
+		strcat(path, conf);
+	}
+
+	strcat(path, file);
+	fp = fopen(path, "r");
+
+	if (fp == NULL) {
+		err_file(path);
+	}
+
+	size_t len = 0;
+	ssize_t(read);
+	time_t t;
+	time(&t);
+
+	while ((read = getline(&line, &len, fp)) != -1) {
+		if (*line == '#' || *line == '\n') {
+			continue;
+		}
+
+		nl = strchr(line, '\n');
+
+		if (nl) {
+			*nl = '\0';
+		}
+
+		setenv("TZ", line, 1);
+		strftime(timestr, sizeof(timestr), s, localtime(&t));
+
+		while ((sep = strchr(line, '_'))) {
+			*sep = ' ';
+		}
+
+		printf("%-24s%s\n", line, timestr);
+	}
+
+	free(line);
+	free(path);
+	fclose(fp);
+}
+
+int main(int argc, char **argv) {
+	int opt;
+	const char *progname = basename(argv[0]);
+	const char *timefmt = time_fmts[TIMEFMT_DEFAULT];
+	opterr = 0;
+
+	while ((opt = getopt(argc, argv, "h")) != -1) {
+		switch (opt) {
+			case 'h':
+				timefmt = time_fmts[TIMEFMT_HUMAN];
+				break;
+			case '?':
+				fprintf(stderr, "%s: invalid option -%c\n", progname, optopt);
+				break;
+			default:
+				usage(progname);
+				return(1);
+		}
+	}
+
+	fparse(timefmt);
+	return(0);
+}