feat: add C implementation for blas/base/csscal

PR-URL: #12314
Co-authored-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Athan Reines <kgryte@gmail.com> 
Signed-off-by: Athan Reines <kgryte@gmail.com>

Author: MeKaustubh07

lib/node_modules/@stdlib/blas/base/csscal/README.md

@@ -149,6 +149,150 @@ console.log( x.toString() );
 
 <!-- /.examples -->
 
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/blas/base/csscal.h"
+```
+
+#### c_csscal( N, alpha, \*X, strideX )
+
+Scales a single-precision complex floating-point vector by a single-precision floating-point constant.
+
+```c
+#include "stdlib/complex/float32/ctor.h"
+
+stdlib_complex64_t x[] = {
+    stdlib_complex64( 1.0f, 2.0f ),
+    stdlib_complex64( 3.0f, 4.0f ),
+    stdlib_complex64( 5.0f, 6.0f )
+};
+
+c_csscal( 3, 2.0f, x, 1 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **alpha**: `[in] float` scalar constant.
+-   **X**: `[inout] stdlib_complex64_t*` input array.
+-   **strideX**: `[in] CBLAS_INT` index increment for `x`.
+
+```c
+void c_csscal( const CBLAS_INT N, const float alpha, void *X, const CBLAS_INT strideX );
+```
+
+#### c_csscal_ndarray( N, alpha, \*X, strideX, offsetX )
+
+Scales a single-precision complex floating-point vector by a single-precision floating-point constant using alternative indexing semantics.
+
+```c
+#include "stdlib/complex/float32/ctor.h"
+
+stdlib_complex64_t x[] = {
+    stdlib_complex64( 1.0f, 2.0f ),
+    stdlib_complex64( 3.0f, 4.0f ),
+    stdlib_complex64( 5.0f, 6.0f )
+};
+
+c_csscal_ndarray( 3, 2.0f, x, 1, 0 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] CBLAS_INT` number of indexed elements.
+-   **alpha**: `[in] float` scalar constant.
+-   **X**: `[inout] void*` input array.
+-   **strideX**: `[in] CBLAS_INT` index increment for `x`.
+-   **offsetX**: `[in] CBLAS_INT` starting index for `x`.
+
+```c
+void c_csscal_ndarray( const CBLAS_INT N, const float alpha, void *X, const CBLAS_INT strideX, const CBLAS_INT offsetX );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/blas/base/csscal.h"
+#include "stdlib/complex/float32/ctor.h"
+#include "stdlib/complex/float32/real.h"
+#include "stdlib/complex/float32/imag.h"
+#include <stdio.h>
+
+int main( void ) {
+    stdlib_complex64_t x[] = {
+        stdlib_complex64( 1.0f, 2.0f ),
+        stdlib_complex64( 3.0f, 4.0f ),
+        stdlib_complex64( 5.0f, 6.0f ),
+        stdlib_complex64( 7.0f, 8.0f )
+    };
+
+    // Specify the number of elements:
+    const int N = 4;
+
+    // Specify the stride length:
+    const int strideX = 1;
+
+    c_csscal( N, 2.0f, (void *)x, strideX );
+
+    // Print the result:
+    for ( int i = 0; i < N; i++ ) {
+        printf( "x[ %i ] = %f + %fj\n", i, stdlib_complex64_real( x[ i ] ), stdlib_complex64_imag( x[ i ] ) );
+    }
+
+    c_csscal_ndarray( N, 2.0f, (void *)x, strideX, 0 );
+
+    // Print the result:
+    for ( int i = 0; i < N; i++ ) {
+        printf( "x[ %i ] = %f + %fj\n", i, stdlib_complex64_real( x[ i ] ), stdlib_complex64_imag( x[ i ] ) );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">
@@ -163,7 +307,7 @@ console.log( x.toString() );
 
 [blas]: http://www.netlib.org/blas
 
-[csscal]: https://www.netlib.org/lapack/explore-html/d2/de8/group__scal_ga40d50a435a5fcf16cf41fa80d746819f.html#ga40d50a435a5fcf16cf41fa80d746819f
+[csscal]: https://www.netlib.org/lapack/explore-html/d2/de8/group__scal_ga38234ecdfde7c9a45753af53d13b0187.html#ga38234ecdfde7c9a45753af53d13b0187
 
 [mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
 

lib/node_modules/@stdlib/blas/base/csscal/benchmark/benchmark.native.js

@@ -0,0 +1,113 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var Complex64Array = require( '@stdlib/array/complex64' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var csscal = tryRequire( resolve( __dirname, './../lib/csscal.native.js' ) );
+var opts = {
+	'skip': ( csscal instanceof Error )
+};
+var options = {
+	'dtype': 'float32'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var xbuf;
+	var x;
+
+	xbuf = uniform( len*2, -100.0, 100.0, options );
+	x = new Complex64Array( xbuf.buffer );
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			csscal( x.length, 2.0, x, 1 );
+			if ( isnanf( xbuf[ i%(len*2) ] ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnanf( xbuf[ i%(len*2) ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s::native:len=%d', pkg, len ), opts, f );
+	}
+}
+
+main();

lib/node_modules/@stdlib/blas/base/csscal/benchmark/benchmark.ndarray.native.js

@@ -0,0 +1,113 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var Complex64Array = require( '@stdlib/array/complex64' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var csscal = tryRequire( resolve( __dirname, './../lib/ndarray.native.js' ) );
+var opts = {
+	'skip': ( csscal instanceof Error )
+};
+var options = {
+	'dtype': 'float32'
+};
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+	var xbuf;
+	var x;
+
+	xbuf = uniform( len*2, -100.0, 100.0, options );
+	x = new Complex64Array( xbuf.buffer );
+
+	return benchmark;
+
+	/**
+	* Benchmark function.
+	*
+	* @private
+	* @param {Benchmark} b - benchmark instance
+	*/
+	function benchmark( b ) {
+		var i;
+
+		b.tic();
+		for ( i = 0; i < b.iterations; i++ ) {
+			csscal( x.length, 2.0, x, 1, 0 );
+			if ( isnanf( xbuf[ i%(len*2) ] ) ) {
+				b.fail( 'should not return NaN' );
+			}
+		}
+		b.toc();
+		if ( isnanf( xbuf[ i%(len*2) ] ) ) {
+			b.fail( 'should not return NaN' );
+		}
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+	var len;
+	var min;
+	var max;
+	var f;
+	var i;
+
+	min = 1; // 10^min
+	max = 6; // 10^max
+
+	for ( i = min; i <= max; i++ ) {
+		len = pow( 10, i );
+		f = createBenchmark( len );
+		bench( format( '%s::native:ndarray:len=%d', pkg, len ), opts, f );
+	}
+}
+
+main();