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Reintroduce EQU __LINE__

It was removed in commit 6198cc185c24ec4ba794ed27c969ae65d31f89c3, but
the documentation wasn't updated back then.

It makes more sense to reintroduce it now than to remove it from the
docs.

Signed-off-by: Antonio Niño Díaz <[email protected]>

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -20,6 +20,7 @@

 struct sSymbol *pScope = NULL;

 struct sSymbol *pPCSymbol = NULL;

 struct sSymbol *p_NARGSymbol = NULL;

+struct sSymbol *p__LINE__Symbol = NULL;

 char *currentmacroargs[MAXMACROARGS + 1];

 char *newmacroargs[MAXMACROARGS + 1];

 char SavedTIME[256];

@@ -60,6 +61,13 @@

 	return (i);

 }

+SLONG

+Callback__LINE__(struct sSymbol * sym)

+{

+	sym = sym;

+	return (nLineNo);

+}

+

 /*

  * Get the nValue field of a symbol

  */

@@ -864,6 +872,9 @@

 	sym_AddEqu("_NARG", 0);

 	p_NARGSymbol = findsymbol("_NARG", NULL);

 	p_NARGSymbol->Callback = Callback_NARG;

+	sym_AddEqu("__LINE__", 0);

+	p__LINE__Symbol = findsymbol("__LINE__", NULL);

+	p__LINE__Symbol->Callback = Callback__LINE__;

 	math_DefinePI();

 }

@@ -890,6 +901,9 @@

 	sym_AddEqu("_NARG", 0);

 	p_NARGSymbol = findsymbol("_NARG", NULL);

 	p_NARGSymbol->Callback = Callback_NARG;

+	sym_AddEqu("__LINE__", 0);

+	p__LINE__Symbol = findsymbol("__LINE__", NULL);

+	p__LINE__Symbol->Callback = Callback__LINE__;

 	sym_AddSet("_RS", 0);