From 28226fed7a52114efbd43860ef1ff7794ce88931 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 28 Aug 2021 17:53:27 -0400
Subject: datetime: WIP

---
(limited to 'src/datetime.c')

diff --git a/src/datetime.c b/src/datetime.c
new file mode 100644
index 0000000..f39f80c
--- /dev/null
+++ b/src/datetime.c
@@ -0,0 +1,104 @@
+#define _XOPEN_SOURCE
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "datetime.h"
+
+static const char *DATETIME_FMTS_[] = {
+	"%H:%M:%S",
+	"%I:%M:%S %p",
+	"%H:%M",
+	"%Y-%m-%dT%H:%M:%S",
+	"%Y-%m-%d %H:%M:%S",
+	"%A %B %d, %Y %H:%M:%S",
+	NULL
+};
+
+static char *
+datetime_normalize_spacing(int argc, const char *argv[])
+{
+	int   buf_l;
+	int   i;
+	int   l;
+	bool  was_space;
+	int   j;
+	char *buf;
+	int   buf_i;
+
+	buf_l = 0;
+	for (i = 0; i < argc; ++i) {
+		l = strlen(argv[i]);
+		was_space = true;
+		for (j = 0; j < l; ++j) {
+			if (isspace(argv[i][j]) != 0) {
+				if (was_space == false) {
+					buf_l++;
+					was_space = true;
+				}
+			} else {
+				buf_l++;
+				was_space = false;
+			}
+		}
+		++buf_l;
+	}
+
+	buf = calloc(buf_l, sizeof(*buf));
+	if (buf == NULL) {
+		fprintf(stderr, "Failed to allocate buffer: %s\n",
+				strerror(errno));
+		return NULL;
+	}
+
+	buf_i = 0;
+	for (i = 0; i < argc; ++i) {
+		l = strlen(argv[i]);
+		was_space = true;
+		for (j = 0; j < l; ++j) {
+			if (isspace(argv[i][j]) != 0) {
+				if (was_space == false) {
+					buf[buf_i++] = ' ';
+					was_space = true;
+				}
+			} else {
+				buf[buf_i++] = argv[i][j];
+				was_space = false;
+			}
+		}
+		buf[buf_i++] = ' ';
+	}
+	buf[--buf_i] = '\0';
+
+	return buf;
+}
+
+int
+datetime_parse(int argc, const char *argv[], struct tm *tm)
+{
+	int   e   = -1;
+	char *buf;
+	int   i;
+	char *end;
+
+	buf = datetime_normalize_spacing(argc, argv);
+	if (buf == NULL) {
+		return -1;
+	}
+
+	for (i = 0; DATETIME_FMTS_[i] != NULL; ++i) {
+		printf("%s =~ %s\n", buf, DATETIME_FMTS_[i]);
+		end = strptime(buf, DATETIME_FMTS_[i], tm);
+		if (end != NULL && *end == '\0') {
+			e = 0;
+			break;
+		}
+	}
+
+	free(buf);
+	return e;
+}
--
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