From: Michael Tremer <michael.tremer@ipfire.org>
Date: Sat, 22 Feb 2025 16:00:36 +0000 (+0000)
Subject: strings: Add function to add formatted strings to a buffer
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=760b49be6b5f2c571cae792989f074ef3a03527b;p=pakfire.git

strings: Add function to add formatted strings to a buffer

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/pakfire/string.c b/src/pakfire/string.c
index 31aea956..6db0cf63 100644
--- a/src/pakfire/string.c
+++ b/src/pakfire/string.c
@@ -381,6 +381,26 @@ int __pakfire_string_append(char* buffer, size_t length, const char* appendix) {
 	return __pakfire_string_set(buffer + l, length - l, appendix);
 }
 
+int __pakfire_string_appendf(char* buffer, size_t length, const char* format, ...) {
+	char* appendix = NULL;
+	va_list args;
+	int r;
+
+	va_start(args, format);
+	r = vasprintf(&appendix, format, args);
+	va_end(args);
+
+	// Return on error
+	if (r < 0)
+		return r;
+
+	// Append the string
+	r = __pakfire_string_append(buffer, length, appendix);
+	free(appendix);
+
+	return r;
+}
+
 int pakfire_string_search(const char* haystack, ssize_t lhaystack,
 		const char* needle, ssize_t lneedle) {
 	// Check inputs
diff --git a/src/pakfire/string.h b/src/pakfire/string.h
index 33a6ce6b..7f96dd9f 100644
--- a/src/pakfire/string.h
+++ b/src/pakfire/string.h
@@ -91,6 +91,11 @@ static inline int pakfire_string_contains_whitespace(const char* s) {
 	__pakfire_string_append(s, sizeof(s), appendix)
 int __pakfire_string_append(char* buffer, size_t length, const char* appendix);
 
+#define pakfire_string_appendf(s, format, ...) \
+	__pakfire_string_appendf(s, sizeof(s), format, __VA_ARGS__)
+int __pakfire_string_appendf(char* buffer, size_t length, const char* format, ...)
+	__attribute__((format(printf, 3, 4)));
+
 int pakfire_string_search(const char* haystack, ssize_t lhaystack,
 	const char* needle, ssize_t lneedle);