From 256f011d2f256c8c2c05c37a518401199fa423bf Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 1 Nov 2023 05:09:40 +0100
Subject: Merging upstream version 4.2+20231026.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 lib.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 79 insertions(+), 16 deletions(-)

(limited to 'lib.c')

diff --git a/lib.c b/lib.c
index fe5c8d2..7ab5998 100644
--- a/lib.c
+++ b/lib.c
@@ -27,6 +27,24 @@
 #include	<ctype.h>
 #include	<limits.h>
 
+/**
+ * is_string_lq() - Check if string length with NULL byte is lower or equal to requested.
+ * @str: string to check.
+ * @max_len: max length.
+ *
+ * @str length must be bigger than 0 and be lower or equal @max_len, including termination byte.
+ */
+bool is_string_lq(const char * const str, size_t max_len)
+{
+	assert(str);
+
+	size_t _len = strnlen(str, max_len);
+
+	if (_len > 0 && _len < max_len)
+		return true;
+	return false;
+}
+
 bool is_dev_alive(char *path)
 {
 	if (!path)
@@ -465,24 +483,50 @@ void print_quoted(char *str)
 	putchar(q);
 }
 
-void print_escape(char *str)
+/**
+ * is_alphanum() - Check if sign is letter or digit.
+ * @c: char to analyze.
+ *
+ * Similar to isalnum() but additional locales are excluded.
+ *
+ * Return: %true on success, %false otherwise.
+ */
+bool is_alphanum(const char c)
 {
-	/* print str, but change space and tab to '_'
-	 * as is suitable for device names
-	 */
-	for (; *str; str++) {
-		switch (*str) {
-		case ' ':
-		case '\t':
-			putchar('_');
-			break;
-		case '/':
-			putchar('-');
-			break;
-		default:
-			putchar(*str);
-		}
+	if (isupper(c) || islower(c) || isdigit(c) != 0)
+		return true;
+	return false;
+}
+
+/**
+ * is_name_posix_compatible() - Check if name is POSIX compatible.
+ * @name: name to check.
+ *
+ *  POSIX portable file name character set contains ASCII letters,
+ *  digits, '_', '.', and '-'. Also forbid leading '-'.
+ *  The length of the name cannot exceed NAME_MAX - 1 (ensure NULL ending).
+ *
+ * Return: %true on success, %false otherwise.
+ */
+bool is_name_posix_compatible(const char * const name)
+{
+	assert(name);
+
+	char allowed_symbols[] = "-_.";
+	const char *n = name;
+
+	if (!is_string_lq(name, NAME_MAX))
+		return false;
+
+	if (*n == '-')
+		return false;
+
+	while (*n != '\0') {
+		if (!is_alphanum(*n) && !strchr(allowed_symbols, *n))
+			return false;
+		n++;
 	}
+	return true;
 }
 
 int check_env(char *name)
@@ -585,3 +629,22 @@ int parse_num(int *dest, const char *num)
 	*dest = temp;
 	return 0;
 }
+
+/**
+ * s_gethostname() - secure get hostname. Assure null-terminated string.
+ *
+ * @buf: buffer for hostname.
+ * @buf_len: buffer length.
+ *
+ * Return: gethostname() result.
+ */
+int s_gethostname(char *buf, int buf_len)
+{
+	assert(buf);
+
+	int ret = gethostname(buf, buf_len);
+
+	buf[buf_len - 1] = 0;
+
+	return ret;
+}
-- 
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