do not allocate translit. contexts, use initialized static vars

iast-czech.c

@@ -163,13 +163,12 @@ static const transliteration_filter_t filters[] = {
 	NULL
 };
 
-struct transliteration_context *transliteration_context_iast_czech_alloc()
+static const struct transliteration_context context = {
+	.table = table,
+	.filters = filters
+};
+
+const struct transliteration_context *get_iast_czech_transliteration_context()
 {
-	struct transliteration_context *context;
-
-	context = malloc(sizeof(*context));
-	context->table = table;
-	context->filters = filters;
-
-	return context;
+	return &context;
 }

iast-czech.h

@@ -5,6 +5,6 @@
 
 #include "transliteration.h"
 
-struct transliteration_context *transliteration_context_iast_czech_alloc();
+const struct transliteration_context *get_iast_czech_transliteration_context();
 
 #endif /* __IAST_CZECH_H */

iast.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 
 #include <stdlib.h>
-#include <string.h>
 
 #include "iast.h"
 #include "transliteration.h"
@@ -103,13 +102,12 @@ static const transliteration_filter_t filters[] = {
 	NULL
 };
 
-struct transliteration_context *transliteration_context_iast_alloc()
+static const struct transliteration_context context = {
+	.table = table,
+	.filters = filters
+};
+
+const struct transliteration_context *get_iast_transliteration_context()
 {
-	struct transliteration_context *context;
-
-	context = malloc(sizeof(*context));
-	context->table = table;
-	context->filters = filters;
-
-	return context;
+	return &context;
 }

iast.h

@@ -5,6 +5,6 @@
 
 #include "transliteration.h"
 
-struct transliteration_context *transliteration_context_iast_alloc();
+const struct transliteration_context *get_iast_transliteration_context();
 
 #endif /* __IAST_H */

main.c

@@ -36,7 +36,6 @@ const char *usage_str =
 static void usage()
 {
 	fprintf(stdout, "%s\n", usage_str);
-	exit(0);
 }
 
 static char *stdin_read()
@@ -67,7 +66,7 @@ int main(int argc, const char **argv)
 	const char *arg;
 	const char *queue[argc];
 	char *input, *output;
-	struct transliteration_context *context;
+	const struct transliteration_context *context;
 
 	for (i = 1; i < argc; i++) {
 		arg = argv[i];
@@ -85,6 +84,7 @@ int main(int argc, const char **argv)
 				continue;
 			case 'h':
 				usage();
+				goto out;
 			}
 
 			fprintf(stderr, "error: unknown option '%s'\n", arg);
@@ -104,15 +104,15 @@ int main(int argc, const char **argv)
 	}
 
 	context = (flags & FLAG_CZECH)
-		? transliteration_context_iast_czech_alloc()
-		: transliteration_context_iast_alloc();
+		? get_iast_czech_transliteration_context()
+		: get_iast_transliteration_context();
 
 	if (flags & FLAG_STDIN) {
 		input = stdin_read();
 		if (input == NULL) {
 			fprintf(stderr, "[iast] failed to read from STDIN.\n");
 			retval = -1;
-			goto drop_context;
+			goto out;
 		}
 
 		output = transliterate_devanagari_to_latin(input, context);
@@ -127,8 +127,6 @@ int main(int argc, const char **argv)
 		free(output);
 	}
 
-drop_context:
-	transliteration_context_drop(context);
 out:
 	return retval;
 }

transliteration.c

@@ -48,7 +48,7 @@ static void apply_transliteration_filters(struct syllable *head,
 }
 
 char *transliterate_devanagari_to_latin(const char *text,
-	struct transliteration_context *context)
+	const struct transliteration_context *context)
 {
 	unsigned int length = strlen(text);
 	const char *ptr = text;
@@ -90,8 +90,3 @@ char *transliterate_devanagari_to_latin(const char *text,
 
 	return tmp;
 }
-
-void transliteration_context_drop(struct transliteration_context *context)
-{
-	free(context);
-}

transliteration.h

@@ -23,9 +23,7 @@ struct transliteration_context {
 };
 
 char *transliterate_devanagari_to_latin(const char *text,
-	struct transliteration_context *context);
-
-void transliteration_context_drop(struct transliteration_context *context);
+	const struct transliteration_context *context);
 
 static inline int is_devanagari(unsigned int code)
 {