Make nasm_malloc() et al available from inside ndisasm

Clean up nasmlib to remove functions irrelevant for ndisasm; make
nasm_malloc() etc usable inside ndisasm.

1 files changed, 154 insertions, 0 deletions

diff --git a/exprlib.c b/exprlib.c
new file mode 100644
index 0000000..2f03ff0
--- /dev/null
+++ b/exprlib.c
@@ -0,0 +1,154 @@
+/*
+ * exprlib.c
+ *
+ * Library routines to manipulate expression data types.
+ */
+
+#include "nasm.h"
+
+/*
+ * Return TRUE if the argument is a simple scalar. (Or a far-
+ * absolute, which counts.)
+ */
+int is_simple(expr * vect)
+{
+    while (vect->type && !vect->value)
+        vect++;
+    if (!vect->type)
+        return 1;
+    if (vect->type != EXPR_SIMPLE)
+        return 0;
+    do {
+        vect++;
+    } while (vect->type && !vect->value);
+    if (vect->type && vect->type < EXPR_SEGBASE + SEG_ABS)
+        return 0;
+    return 1;
+}
+
+/*
+ * Return TRUE if the argument is a simple scalar, _NOT_ a far-
+ * absolute.
+ */
+int is_really_simple(expr * vect)
+{
+    while (vect->type && !vect->value)
+        vect++;
+    if (!vect->type)
+        return 1;
+    if (vect->type != EXPR_SIMPLE)
+        return 0;
+    do {
+        vect++;
+    } while (vect->type && !vect->value);
+    if (vect->type)
+        return 0;
+    return 1;
+}
+
+/*
+ * Return TRUE if the argument is relocatable (i.e. a simple
+ * scalar, plus at most one segment-base, plus possibly a WRT).
+ */
+int is_reloc(expr * vect)
+{
+    while (vect->type && !vect->value)  /* skip initial value-0 terms */
+        vect++;
+    if (!vect->type)            /* trivially return TRUE if nothing */
+        return 1;               /* is present apart from value-0s */
+    if (vect->type < EXPR_SIMPLE)       /* FALSE if a register is present */
+        return 0;
+    if (vect->type == EXPR_SIMPLE) {    /* skip over a pure number term... */
+        do {
+            vect++;
+        } while (vect->type && !vect->value);
+        if (!vect->type)        /* ...returning TRUE if that's all */
+            return 1;
+    }
+    if (vect->type == EXPR_WRT) {       /* skip over a WRT term... */
+        do {
+            vect++;
+        } while (vect->type && !vect->value);
+        if (!vect->type)        /* ...returning TRUE if that's all */
+            return 1;
+    }
+    if (vect->value != 0 && vect->value != 1)
+        return 0;               /* segment base multiplier non-unity */
+    do {                        /* skip over _one_ seg-base term... */
+        vect++;
+    } while (vect->type && !vect->value);
+    if (!vect->type)            /* ...returning TRUE if that's all */
+        return 1;
+    return 0;                   /* And return FALSE if there's more */
+}
+
+/*
+ * Return TRUE if the argument contains an `unknown' part.
+ */
+int is_unknown(expr * vect)
+{
+    while (vect->type && vect->type < EXPR_UNKNOWN)
+        vect++;
+    return (vect->type == EXPR_UNKNOWN);
+}
+
+/*
+ * Return TRUE if the argument contains nothing but an `unknown'
+ * part.
+ */
+int is_just_unknown(expr * vect)
+{
+    while (vect->type && !vect->value)
+        vect++;
+    return (vect->type == EXPR_UNKNOWN);
+}
+
+/*
+ * Return the scalar part of a relocatable vector. (Including
+ * simple scalar vectors - those qualify as relocatable.)
+ */
+int64_t reloc_value(expr * vect)
+{
+    while (vect->type && !vect->value)
+        vect++;
+    if (!vect->type)
+        return 0;
+    if (vect->type == EXPR_SIMPLE)
+        return vect->value;
+    else
+        return 0;
+}
+
+/*
+ * Return the segment number of a relocatable vector, or NO_SEG for
+ * simple scalars.
+ */
+int32_t reloc_seg(expr * vect)
+{
+    while (vect->type && (vect->type == EXPR_WRT || !vect->value))
+        vect++;
+    if (vect->type == EXPR_SIMPLE) {
+        do {
+            vect++;
+        } while (vect->type && (vect->type == EXPR_WRT || !vect->value));
+    }
+    if (!vect->type)
+        return NO_SEG;
+    else
+        return vect->type - EXPR_SEGBASE;
+}
+
+/*
+ * Return the WRT segment number of a relocatable vector, or NO_SEG
+ * if no WRT part is present.
+ */
+int32_t reloc_wrt(expr * vect)
+{
+    while (vect->type && vect->type < EXPR_WRT)
+        vect++;
+    if (vect->type == EXPR_WRT) {
+        return vect->value;
+    } else
+        return NO_SEG;
+}
+