Split macro arg management into its own file

It has no relation to symbols, and helps a tiny bit deflate `symbol.c`

src/asm/macro.c

@@ -0,0 +1,118 @@
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "asm/asm.h"
+#include "asm/macro.h"
+#include "asm/warning.h"
+
+static char *currentmacroargs[MAXMACROARGS + 1];
+static char *newmacroargs[MAXMACROARGS + 1];
+
+void sym_AddNewMacroArg(char const *s)
+{
+	int32_t i = 0;
+
+	while (i < MAXMACROARGS && newmacroargs[i] != NULL)
+		i++;
+
+	if (i < MAXMACROARGS) {
+		if (s)
+			newmacroargs[i] = strdup(s);
+		else
+			newmacroargs[i] = NULL;
+	} else {
+		yyerror("A maximum of %d arguments allowed", MAXMACROARGS);
+	}
+}
+
+void sym_SaveCurrentMacroArgs(char *save[])
+{
+	int32_t i;
+
+	for (i = 0; i <= MAXMACROARGS; i++) {
+		save[i] = currentmacroargs[i];
+		currentmacroargs[i] = NULL;
+	}
+}
+
+void sym_RestoreCurrentMacroArgs(char *save[])
+{
+	int32_t i;
+
+	for (i = 0; i <= MAXMACROARGS; i++) {
+		free(currentmacroargs[i]);
+		currentmacroargs[i] = save[i];
+	}
+}
+
+void sym_UseNewMacroArgs(void)
+{
+	int32_t i;
+
+	for (i = 0; i <= MAXMACROARGS; i++) {
+		free(currentmacroargs[i]);
+		currentmacroargs[i] = newmacroargs[i];
+		newmacroargs[i] = NULL;
+	}
+}
+
+char *sym_FindMacroArg(int32_t i)
+{
+	if (i == -1)
+		i = MAXMACROARGS + 1;
+
+	assert(i >= 1);
+
+	assert((size_t)(i - 1)
+	       < sizeof(currentmacroargs) / sizeof(*currentmacroargs));
+
+	return currentmacroargs[i - 1];
+}
+
+void sym_UseCurrentMacroArgs(void)
+{
+	int32_t i;
+
+	for (i = 1; i <= MAXMACROARGS; i++)
+		sym_AddNewMacroArg(sym_FindMacroArg(i));
+}
+
+void sym_SetMacroArgID(uint32_t nMacroCount)
+{
+	char s[256];
+
+	snprintf(s, sizeof(s) - 1, "_%u", nMacroCount);
+	newmacroargs[MAXMACROARGS] = strdup(s);
+}
+
+void sym_ShiftCurrentMacroArgs(void)
+{
+	int32_t i;
+
+	free(currentmacroargs[0]);
+	for (i = 0; i < MAXMACROARGS - 1; i++)
+		currentmacroargs[i] = currentmacroargs[i + 1];
+
+	currentmacroargs[MAXMACROARGS - 1] = NULL;
+}
+
+uint32_t sym_NbMacroArgs(void)
+{
+	uint32_t i = 0;
+
+	while (currentmacroargs[i] && i < MAXMACROARGS)
+		i++;
+
+	return i;
+}
+
+void macro_Init(void)
+{
+	for (uint32_t i = 0; i < MAXMACROARGS; i++) {
+		currentmacroargs[i] = NULL;
+		newmacroargs[i] = NULL;
+	}
+}