Fix residual strict-protoype compiler warnings

Author: gorcha

src/readstat/readstat_bits.c

@@ -8,7 +8,7 @@
 
 #include "readstat_bits.h"
 
-int machine_is_little_endian() {
+int machine_is_little_endian(void) {
     int test_byte_order = 1;
     return ((char *)&test_byte_order)[0];
 }

src/readstat/readstat_parser.c

@@ -3,7 +3,7 @@
 #include "readstat.h"
 #include "readstat_io_unistd.h"
 
-readstat_parser_t *readstat_parser_init() {
+readstat_parser_t *readstat_parser_init(void) {
     readstat_parser_t *parser = calloc(1, sizeof(readstat_parser_t));
     parser->io = calloc(1, sizeof(readstat_io_t));
     if (unistd_io_init(parser) != READSTAT_OK) {

src/readstat/readstat_variable.c

@@ -5,7 +5,7 @@
 static readstat_value_t make_blank_value(void);
 static readstat_value_t make_double_value(double dval);
 
-static readstat_value_t make_blank_value() {
+static readstat_value_t make_blank_value(void) {
     readstat_value_t value = { .is_system_missing = 1, .v = { .double_value = NAN }, .type = READSTAT_TYPE_DOUBLE };
     return value;
 }

src/readstat/readstat_writer.c

@@ -35,7 +35,7 @@ readstat_string_ref_t *readstat_string_ref_init(const char *string) {
     return ref;
 }
 
-readstat_writer_t *readstat_writer_init() {
+readstat_writer_t *readstat_writer_init(void) {
     readstat_writer_t *writer = calloc(1, sizeof(readstat_writer_t));
 
     writer->variables = calloc(VARIABLES_INITIAL_CAPACITY, sizeof(readstat_variable_t *));

src/readstat/sas/ieee.c

@@ -96,7 +96,7 @@ int cnxptiee(const void *from_bytes, int fromtype, void *to_bytes, int totype)
     return(0);
 }
 
-int get_native() {
+int get_native(void) {
     static unsigned char float_reps[][8] = {
         {0x41,0x10,0x00,0x00,0x00,0x00,0x00,0x00},
         {0x3f,0xf0,0x00,0x00,0x00,0x00,0x00,0x00},

src/readstat/sas/readstat_sas.c

@@ -120,7 +120,7 @@ static readstat_charset_entry_t _charset_table[] = {
     { .code = 248,   .name = "SHIFT_JISX0213" },
 };
 
-static time_t sas_epoch() {
+static time_t sas_epoch(void) {
     return - 3653 * 86400; // seconds between 01-01-1960 and 01-01-1970
 }
 

src/readstat/sas/readstat_xport_read.c

@@ -45,7 +45,7 @@ static readstat_error_t xport_update_progress(xport_ctx_t *ctx) {
     return io->update(ctx->file_size, ctx->handle.progress, ctx->user_ctx, io->io_ctx);
 }
 
-static xport_ctx_t *xport_ctx_init() {
+static xport_ctx_t *xport_ctx_init(void) {
     xport_ctx_t *ctx = calloc(1, sizeof(xport_ctx_t));
     return ctx;
 }

src/readstat/spss/readstat_por.c

@@ -64,7 +64,7 @@ uint16_t por_unicode_lookup[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0 };
 
-por_ctx_t *por_ctx_init() {
+por_ctx_t *por_ctx_init(void) {
     por_ctx_t *ctx = calloc(1, sizeof(por_ctx_t));
 
     ctx->space = ' ';

src/readstat/spss/readstat_por_write.c

@@ -167,7 +167,7 @@ static readstat_error_t por_write_string_field(readstat_writer_t *writer, por_wr
     return por_write_string_field_n(writer, ctx, string, strlen(string));
 }
 
-static por_write_ctx_t *por_write_ctx_init() {
+static por_write_ctx_t *por_write_ctx_init(void) {
     por_write_ctx_t *ctx = calloc(1, sizeof(por_write_ctx_t));
     uint16_t max_unicode = 0;
     int i;