From: Michael Tremer <michael.tremer@ipfire.org>
Date: Wed, 13 Mar 2019 14:31:23 +0000 (+0000)
Subject: libpakfire: util: Write function to read file into buffer
X-Git-Tag: 0.9.28~1285^2~1072
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3bf7e142c3acb1486032787c8d5be449b5115adc;p=pakfire.git

libpakfire: util: Write function to read file into buffer

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

diff --git a/src/libpakfire/include/pakfire/util.h b/src/libpakfire/include/pakfire/util.h
index bc2a36aa3..e43510d73 100644
--- a/src/libpakfire/include/pakfire/util.h
+++ b/src/libpakfire/include/pakfire/util.h
@@ -22,6 +22,7 @@
 #define PAKFIRE_UTIL_H
 
 #include <stddef.h>
+#include <stdio.h>
 #include <sys/types.h>
 #include <time.h>
 
@@ -55,4 +56,6 @@ const char* pakfire_action_type_string(pakfire_action_type_t type);
 
 void init_libgcrypt();
 
+int pakfire_read_file_into_buffer(FILE* f, char** buffer, size_t* len);
+
 #endif /* PAKFIRE_UTIL_H */
diff --git a/src/libpakfire/libpakfire.sym b/src/libpakfire/libpakfire.sym
index 56a796ef8..471155082 100644
--- a/src/libpakfire/libpakfire.sym
+++ b/src/libpakfire/libpakfire.sym
@@ -336,6 +336,7 @@ global:
 	pakfire_free;
 	pakfire_get_errno;
 	pakfire_path_join;
+	pakfire_read_file_into_buffer;
 
 local:
 	*;
diff --git a/src/libpakfire/util.c b/src/libpakfire/util.c
index 50d252d17..092f11773 100644
--- a/src/libpakfire/util.c
+++ b/src/libpakfire/util.c
@@ -281,3 +281,40 @@ PAKFIRE_EXPORT const char* pakfire_action_type_string(pakfire_action_type_t type
 
 	return NULL;
 }
+
+PAKFIRE_EXPORT int pakfire_read_file_into_buffer(FILE* f, char** buffer, size_t* len) {
+	if (!f)
+		return -EBADF;
+
+	int r = fseek(f, 0, SEEK_END);
+	if (r)
+		return r;
+
+	// Save length of file
+	*len = ftell(f);
+
+	// Go back to the start
+	r = fseek(f, 0, SEEK_SET);
+	if (r)
+		return r;
+
+	// Allocate buffer
+	*buffer = pakfire_malloc((sizeof(**buffer) * *len) + 1);
+	if (!*buffer)
+		return -ENOMEM;
+
+	// Read content
+	fread(*buffer, *len, sizeof(**buffer), f);
+
+	// Check we encountered any errors
+	r = ferror(f);
+	if (r) {
+		pakfire_free(*buffer);
+		return r;
+	}
+
+	// Terminate the buffer
+	(*buffer)[*len] = '\0';
+
+	return 0;
+}