libs/libhutils: add alignment functions

Add functions to align a given value to a given alignment and to calculate the necessary padding to align the value.

libs/libhutils: add alignment functions
Add functions to align a given value to a given alignment and to calculate the necessary padding to align the value.
219805fc · Janito Vaqueiro Ferreira Filho · f09be5d1 · 219805fc · 219805fc
Commit 219805fc authored Aug 09, 2016 by Janito Vaqueiro Ferreira Filho
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hutils_utils.h src/libs/libhutils/include/hutils_utils.h +7 -0

hutils_utils.c src/libs/libhutils/src/hutils_utils.c +18 -1

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--- a/src/libs/libhutils/include/hutils_utils.h
+++ b/src/libs/libhutils/include/hutils_utils.h
@@ -87,6 +87,13 @@ char *hutils_concat_strings_no_sep (const char *str1, const char* str2);
 char *hutils_concat_strings3 (const char *str1, const char* str2,
        const char* str3, char sep);

+/* Calculates necessary padding so that a given value is a multiple of a given
+ * alignment */
+uint32_t hutils_calculate_padding(uint32_t value, uint32_t alignment);
+
+/* Aligns a given value to a given alignment */
+uint32_t hutils_align_value(uint32_t value, uint32_t alignment);
+
 /* Spawns (fork and exec) a new process. Returns, for the parent process, -1
 * in case of error and child's PID (> 0) if success. For the child process,
 * returns -1 in case of error and 0 in case of success */

--- a/src/libs/libhutils/src/hutils_utils.c
+++ b/src/libs/libhutils/src/hutils_utils.c
@@ -177,6 +177,24 @@ char *hutils_concat_strings3 (const char *str1, const char* str2,
    return _hutils_concat_strings_raw (str1, str2, str3, true, sep);
 }

+/*******************************************************************/
+/*****************  Byte manipulation functions ********************/
+/*******************************************************************/
+
+uint32_t hutils_calculate_padding(uint32_t value, uint32_t alignment)
+{
+    uint32_t exceeded = value % alignment;
+    uint32_t remaining = alignment - exceeded;
+    uint32_t padding = remaining % alignment;
+
+    return padding;
+}
+
+uint32_t hutils_align_value(uint32_t value, uint32_t alignment)
+{
+    return value + hutils_calculate_padding(value, alignment);
+}
+
 /*******************************************************************/
 /*****************  System Fork/Exec functions *********************/
 /*******************************************************************/
@@ -502,4 +520,3 @@ err_hash_item_alloc:
 err_cfg_exit:
    return err;
 }
-