[PATCH 1/2] unicode: mkutf8data: Add compound malloc function

[Li kunyu]

The patch has the following modifications.
1. Add unicode_data_malloc function, which realizes the combined use of
malloc and memcpy, and assigns values to dst.
2. Add unicode_data_remalloc function assigns 0 to the data in the
allocated memory pointer. When the integer free parameter specifies 1,
execute free (* dst), and finally assign the value to dst.
3. Remove the original um pointer related code and replace it with these
two functions.

Signed-off-by: Li kunyu <kunyu@xxxxxxxxxxxx>
---
 fs/unicode/mkutf8data.c | 99 +++++++++++++++++++----------------------
 1 file changed, 47 insertions(+), 52 deletions(-)

diff --git a/fs/unicode/mkutf8data.c b/fs/unicode/mkutf8data.c
index bc1a7c8b5c8d..adcf018f7985 100644
--- a/fs/unicode/mkutf8data.c
+++ b/fs/unicode/mkutf8data.c
@@ -2113,6 +2113,29 @@ static int ignore_compatibility_form(char *type)
 	return 0;
 }
 
+static void unicode_data_malloc(void *src, void **dst, size_t len)
+{
+	unsigned int *um = malloc(len);
+
+	if (um)
+		memcpy(um, src, len);
+
+	*dst = um;
+}
+
+static void unicode_data_remalloc(void **dst, size_t len, int free)
+{
+	unsigned int *um = malloc(len);
+
+	if (free == 1)
+		free(*dst);
+
+	if (um)
+		*um = 0
+
+	*dst = um;
+}
+
 static void nfdi_init(void)
 {
 	FILE *file;
@@ -2120,7 +2143,6 @@ static void nfdi_init(void)
 	unsigned int mapping[19]; /* Magic - guaranteed not to be exceeded. */
 	char *s;
 	char *type;
-	unsigned int *um;
 	int count;
 	int i;
 	int ret;
@@ -2159,10 +2181,8 @@ static void nfdi_init(void)
 		}
 		mapping[i++] = 0;
 
-		um = malloc(i * sizeof(unsigned int));
-		memcpy(um, mapping, i * sizeof(unsigned int));
-		unicode_data[unichar].utf32nfdi = um;
-
+		unicode_data_malloc(mapping, &unicode_data[unichar].utf32nfdi,
+			i * sizeof(unsigned int));
 		if (verbose > 1)
 			print_utf32nfdi(unichar);
 		count++;
@@ -2181,7 +2201,6 @@ static void nfdicf_init(void)
 	unsigned int mapping[19]; /* Magic - guaranteed not to be exceeded. */
 	char status;
 	char *s;
-	unsigned int *um;
 	int i;
 	int count;
 	int ret;
@@ -2215,10 +2234,8 @@ static void nfdicf_init(void)
 		}
 		mapping[i++] = 0;
 
-		um = malloc(i * sizeof(unsigned int));
-		memcpy(um, mapping, i * sizeof(unsigned int));
-		unicode_data[unichar].utf32nfdicf = um;
-
+		unicode_data_malloc(mapping, &unicode_data[unichar].utf32nfdicf,
+				i * sizeof(unsigned int));
 		if (verbose > 1)
 			print_utf32nfdicf(unichar);
 		count++;
@@ -2236,7 +2253,6 @@ static void ignore_init(void)
 	unsigned int unichar;
 	unsigned int first;
 	unsigned int last;
-	unsigned int *um;
 	int count;
 	int ret;
 
@@ -2255,14 +2271,10 @@ static void ignore_init(void)
 			if (!utf32valid(first) || !utf32valid(last))
 				line_fail(prop_name, line);
 			for (unichar = first; unichar <= last; unichar++) {
-				free(unicode_data[unichar].utf32nfdi);
-				um = malloc(sizeof(unsigned int));
-				*um = 0;
-				unicode_data[unichar].utf32nfdi = um;
-				free(unicode_data[unichar].utf32nfdicf);
-				um = malloc(sizeof(unsigned int));
-				*um = 0;
-				unicode_data[unichar].utf32nfdicf = um;
+				unicode_data_remalloc(&unicode_data[unichar].utf32nfdi,
+						sizeof(unsigned int), 1);
+				unicode_data_remalloc(&unicode_data[unichar].utf32nfdicf,
+						sizeof(unsigned int), 1);
 				count++;
 			}
 			if (verbose > 1)
@@ -2276,14 +2288,10 @@ static void ignore_init(void)
 				continue;
 			if (!utf32valid(unichar))
 				line_fail(prop_name, line);
-			free(unicode_data[unichar].utf32nfdi);
-			um = malloc(sizeof(unsigned int));
-			*um = 0;
-			unicode_data[unichar].utf32nfdi = um;
-			free(unicode_data[unichar].utf32nfdicf);
-			um = malloc(sizeof(unsigned int));
-			*um = 0;
-			unicode_data[unichar].utf32nfdicf = um;
+			unicode_data_remalloc(&unicode_data[unichar].utf32nfdi,
+					sizeof(unsigned int), 1);
+			unicode_data_remalloc(&unicode_data[unichar].utf32nfdicf,
+					sizeof(unsigned int), 1);
 			if (verbose > 1)
 				printf(" %X Default_Ignorable_Code_Point\n",
 					unichar);
@@ -2307,7 +2315,6 @@ static void corrections_init(void)
 	unsigned int minor;
 	unsigned int revision;
 	unsigned int age;
-	unsigned int *um;
 	unsigned int mapping[19]; /* Magic - guaranteed not to be exceeded. */
 	char *s;
 	int i;
@@ -2359,10 +2366,8 @@ static void corrections_init(void)
 		}
 		mapping[i++] = 0;
 
-		um = malloc(i * sizeof(unsigned int));
-		memcpy(um, mapping, i * sizeof(unsigned int));
-		corrections[count].utf32nfdi = um;
-
+		unicode_data_malloc(mapping, &corrections[count].utf32nfdi,
+				i * sizeof(unsigned int));
 		if (verbose > 1)
 			printf(" %X -> %s -> %s V%d_%d_%d\n",
 				unichar, buf0, buf1, major, minor, revision);
@@ -2437,7 +2442,6 @@ static void hangul_decompose(void)
 	/* unsigned int sc = (lc * nc); */
 	unsigned int unichar;
 	unsigned int mapping[4];
-	unsigned int *um;
         int count;
 	int i;
 
@@ -2459,14 +2463,12 @@ static void hangul_decompose(void)
 		mapping[i++] = 0;
 
 		assert(!unicode_data[unichar].utf32nfdi);
-		um = malloc(i * sizeof(unsigned int));
-		memcpy(um, mapping, i * sizeof(unsigned int));
-		unicode_data[unichar].utf32nfdi = um;
+		unicode_data_malloc(mapping, &unicode_data[unichar].utf32nfdi,
+				i * sizeof(unsigned int));
 
 		assert(!unicode_data[unichar].utf32nfdicf);
-		um = malloc(i * sizeof(unsigned int));
-		memcpy(um, mapping, i * sizeof(unsigned int));
-		unicode_data[unichar].utf32nfdicf = um;
+		unicode_data_malloc(mapping, &unicode_data[unichar].utf32nfdicf,
+				i * sizeof(unsigned int));
 
 		/*
 		 * Add a cookie as a reminder that the hangul syllable
@@ -2490,7 +2492,6 @@ static void nfdi_decompose(void)
 {
 	unsigned int unichar;
 	unsigned int mapping[19]; /* Magic - guaranteed not to be exceeded. */
-	unsigned int *um;
 	unsigned int *dc;
 	int count;
 	int i;
@@ -2522,16 +2523,13 @@ static void nfdi_decompose(void)
 			mapping[i++] = 0;
 			if (ret)
 				break;
-			free(unicode_data[unichar].utf32nfdi);
-			um = malloc(i * sizeof(unsigned int));
-			memcpy(um, mapping, i * sizeof(unsigned int));
-			unicode_data[unichar].utf32nfdi = um;
+			unicode_data_remalloc(&unicode_data[unichar].utf32nfdi,
+					i * sizeof(unsigned int), 1);
 		}
 		/* Add this decomposition to nfdicf if there is no entry. */
 		if (!unicode_data[unichar].utf32nfdicf) {
-			um = malloc(i * sizeof(unsigned int));
-			memcpy(um, mapping, i * sizeof(unsigned int));
-			unicode_data[unichar].utf32nfdicf = um;
+			unicode_data_remalloc(&unicode_data[unichar].utf32nfdicf,
+					i * sizeof(unsigned int), 0);
 		}
 		if (verbose > 1)
 			print_utf32nfdi(unichar);
@@ -2545,7 +2543,6 @@ static void nfdicf_decompose(void)
 {
 	unsigned int unichar;
 	unsigned int mapping[19]; /* Magic - guaranteed not to be exceeded. */
-	unsigned int *um;
 	unsigned int *dc;
 	int count;
 	int i;
@@ -2576,10 +2573,8 @@ static void nfdicf_decompose(void)
 			mapping[i++] = 0;
 			if (ret)
 				break;
-			free(unicode_data[unichar].utf32nfdicf);
-			um = malloc(i * sizeof(unsigned int));
-			memcpy(um, mapping, i * sizeof(unsigned int));
-			unicode_data[unichar].utf32nfdicf = um;
+			unicode_data_remalloc(&unicode_data[unichar].utf32nfdicf,
+					i * sizeof(unsigned int), 1);
 		}
 		if (verbose > 1)
 			print_utf32nfdicf(unichar);
-- 
2.18.2