From: Michael Tremer <michael.tremer@ipfire.org>
Date: Mon, 6 Oct 2025 14:28:01 +0000 (+0000)
Subject: util: Add a helper function to iterate through file handles
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0d468e53881051bd7ba08bccd7c92d8514b62cb;p=telemetry.git

util: Add a helper function to iterate through file handles

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

diff --git a/src/daemon/util.c b/src/daemon/util.c
index 45ae46f..bc9dc03 100644
--- a/src/daemon/util.c
+++ b/src/daemon/util.c
@@ -79,3 +79,45 @@ int collecty_format_title(char** title, const char* format, ...) {
 
 	return 0;
 }
+
+int collecty_fwalk(FILE* f, collecty_fwalk_callback callback, void* data) {
+	char* line = NULL;
+	size_t length = 0;
+	size_t l = 0;
+	int r;
+
+	// Start at the beginning of the stream
+	r = fseek(f, 0L, SEEK_SET);
+	if (r < 0)
+		return -errno;
+
+	// Walk through all lines
+	for (;;) {
+		// Fetch the next line
+		r = getline(&line, &length, f);
+		if (r < 0) {
+			// Reset r if have reached the end of the file
+			if (feof(f))
+				r = 0;
+
+			break;
+		}
+
+		// Remove the trailing newline
+		collecty_string_rstrip(line);
+
+		// Determine the length of the line
+		l = strlen(line);
+
+		// Call the callback
+		r = callback(line, l, data);
+		if (r < 0)
+			break;
+	}
+
+	// Cleanup
+	if (line)
+		free(line);
+
+	return r;
+}
diff --git a/src/daemon/util.h b/src/daemon/util.h
index 143e8b2..c50d507 100644
--- a/src/daemon/util.h
+++ b/src/daemon/util.h
@@ -22,6 +22,7 @@
 #define COLLECTY_UTIL_H
 
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 // Preprocessor macro to make something a string
@@ -51,4 +52,8 @@ int collecty_file_read_uint64(const char* path, uint64_t* number);
 int collecty_format_title(char** title, const char* format, ...)
 	__attribute__((format(printf, 2, 3)));
 
+typedef int (*collecty_fwalk_callback)(const char* line, const size_t length, void* data);
+
+int collecty_fwalk(FILE* f, collecty_fwalk_callback callback, void* data);
+
 #endif /* COLLECTY_UTIL_H */