Initial commit

1 files changed, 193 insertions, 0 deletions

diff --git a/pkg/utilities/nttools/keyselect/expr.x b/pkg/utilities/nttools/keyselect/expr.x
new file mode 100644
index 00000000..fa7e5d31
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+++ b/pkg/utilities/nttools/keyselect/expr.x
@@ -0,0 +1,193 @@
+include	<evexpr.h>
+include	"keyselect.h"
+
+#* HISTORY *
+#* B.Simon	12-Mar-1992	Original
+#* Phil Hodge	 4-Mar-2002	Free memory allocated by evexpr.
+
+# EVAL_EXPR -- Evaluate a boolean expression using image header keywords
+
+bool procedure eval_expr (im, expr)
+
+pointer	im		# i: image descriptor
+char	expr[ARB]	# i: boolean expression
+#--
+include	"keyselect.com"
+
+pointer	op, sp, errmsg
+
+string	badtype  "Expression is not of boolean type"
+string	badname  "Warning: header keyword %s not found in %s\n"
+
+int	errget()
+pointer	evexpr(), locpr()
+extern	fun_expr, var_expr
+
+begin
+	call smark (sp)
+	call salloc (errmsg, SZ_LINE, TY_CHAR)
+
+	img = im
+	iferr {
+	    op = evexpr (expr, locpr(var_expr), locpr (fun_expr))
+
+	} then {
+	    if (errget(Memc[errmsg], SZ_LINE) == ERR_SYNTAX) {
+		call xer_reset
+		call error (ERR_SYNTAX, Memc[errmsg])
+
+	    } else {
+		call xer_reset
+		call eprintf ("Warning: %s\n")
+		call pargstr (Memc[errmsg])
+		call mfree (op, TY_STRUCT)
+
+		return (false)
+	    }
+	}
+
+	if (O_TYPE(op) != TY_BOOL)
+	    call error (ERR_SYNTAX, badtype)
+
+	call xev_freeop (op)
+	call mfree (op, TY_STRUCT)
+	call sfree (sp)
+	return (O_VALB(op))
+end
+
+# FMT_EXPR -- Format an expression to make it easier to parse
+
+procedure fmt_expr (expr)
+
+char	expr[ARB]	# i: expression
+#--
+int	ic, jc
+
+begin
+	# Find first non-white character
+
+	for (ic = 1; expr[ic] != EOS; ic = ic + 1) {
+	    if (expr[ic] > ' ')
+		break
+	}
+
+	# Copy remaining characters, replacing newlines with blanks
+
+	jc = 1
+	for ( ; expr[ic] != EOS; ic = ic + 1) {
+	    if (expr[ic] == '\n') {
+		expr[jc] = ' '
+	    } else if (jc < ic) {
+		expr[jc] = expr[ic]
+	    }
+	    jc = jc + 1
+	}
+
+	expr[jc] = EOS
+end
+
+# FUN_EXPR -- Evaluate non-standard functions used in expression
+
+procedure fun_expr (func, argptr, nargs, op)
+
+char	func[ARB]	# i: function name
+pointer	argptr[ARB]	# i: pointers to function arguments
+int	nargs		# i: number of function arguments
+pointer	op		# o: structure containing function value
+#--
+include "keyselect.com"
+
+int	arg
+pointer	sp, errmsg
+
+string	flist   "find"
+string	badfun	"Unknown function name (%s)"
+string	badtyp	"Invalid argument type for %s"
+
+int	word_match(), imaccf()
+
+begin
+	call smark (sp)
+	call salloc (errmsg, SZ_LINE, TY_CHAR)
+
+	switch (word_match (func, flist)) {
+	case 0: # unrecognized function name
+	    call sprintf (Memc[errmsg], SZ_LINE, badfun)
+	    call pargstr (func)
+	    call error (ERR_SYNTAX, Memc[errmsg])
+
+	case 1: # find keyword in header ?
+	    call xev_initop (op, 0, TY_BOOL)
+	    O_VALB(op) = true
+
+	    do arg = 1, nargs {
+		if (O_TYPE(argptr[arg]) != TY_CHAR) {
+		    call sprintf (Memc[errmsg], SZ_LINE, badtyp)
+		    call pargstr (func)
+		    call error (ERR_SYNTAX, Memc[errmsg])
+		}
+
+		if (imaccf (img, O_VALC(argptr[arg])) == NO)
+		    O_VALB(op) = false
+	    }
+	}
+
+	call sfree (sp)
+end
+
+# VAR_EXPR -- Retrieve keyword used in expression
+
+procedure var_expr (name, op)
+
+char	name[ARB]	# i: keyword name
+pointer	op		# o: structure containing value of variable
+#--
+include	"keyselect.com"
+
+int	ic, dtype, type, length, junk
+pointer	sp, value
+
+string	badname "Expression cannot be evaluated because keyword not found"
+
+bool	streq()
+int	ctoi(), ctor()
+
+begin
+	call smark(sp) 
+	call salloc (value, SZ_BIGCOL, TY_CHAR)
+
+	# Retrieve keyword value from image header
+
+	call get_keyword (img, name, dtype, Memc[value], SZ_BIGCOL)
+
+	# Allocate structure to hold value
+
+	if (dtype == 0) {
+	    call error (ERR_NOFIND, badname)
+	} else if (dtype < 0) {
+	    type = TY_CHAR
+	    length = - dtype
+	} else {
+	    type = dtype
+	    length = 0
+	}
+
+	call xev_initop (op, length, type)
+
+	# Copy value to structure
+
+	switch (type) {
+	case TY_BOOL:
+	    O_VALB(op) = streq (Memc[value], "yes")
+	case TY_CHAR:
+	    call strcpy (Memc[value], O_VALC(op), length)
+	case TY_SHORT,TY_INT,TY_LONG:
+	    ic = 1
+	    junk = ctoi (Memc[value], ic, O_VALI(op))
+	case TY_REAL,TY_DOUBLE:
+	    ic = 1
+	    junk = ctor (Memc[value], ic, O_VALR(op))
+	}
+
+	call sfree(sp)
+end