feat: add C implementation for lapack/base/dlaswp

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: passed
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: passed
  - task: lint_c_examples
    status: passed
  - task: lint_c_benchmarks
    status: passed
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: iampratik13

lib/node_modules/@stdlib/lapack/base/dlaswp/README.md

@@ -38,7 +38,7 @@ Performs a series of row interchanges on an input matrix `A` using pivot indices
 var Int32Array = require( '@stdlib/array/int32' );
 var Float64Array = require( '@stdlib/array/float64' );
 
-var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
+var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
 var IPIV = new Int32Array( [ 2, 0, 1 ] );
 
 dlaswp( 'row-major', 2, A, 2, 0, 2, IPIV, 1 );
@@ -62,7 +62,7 @@ The sign of the increment parameter `incx` determines the order in which pivots
 var Int32Array = require( '@stdlib/array/int32' );
 var Float64Array = require( '@stdlib/array/float64' );
 
-var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
+var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
 var IPIV = new Int32Array( [ 2, 0, 1 ] );
 
 dlaswp( 'row-major', 2, A, 2, 0, 2, IPIV, -1 );
@@ -75,7 +75,7 @@ To perform strided access over `IPIV`, provide an `abs(incx)` value greater than
 var Int32Array = require( '@stdlib/array/int32' );
 var Float64Array = require( '@stdlib/array/float64' );
 
-var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
+var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
 var IPIV = new Int32Array( [ 2, 999, 0, 999, 1 ] );
 
 dlaswp( 'row-major', 2, A, 2, 0, 2, IPIV, 2 );
@@ -110,7 +110,7 @@ Performs a series of row interchanges on the matrix `A` using pivot indices stor
 var Int32Array = require( '@stdlib/array/int32' );
 var Float64Array = require( '@stdlib/array/float64' );
 
-var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] ); // => [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
+var A = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
 var IPIV = new Int32Array( [ 2, 0, 1 ] );
 
 dlaswp.ndarray( 2, A, 2, 1, 0, 0, 2, 1, IPIV, 1, 0 );
@@ -219,21 +219,66 @@ console.log( ndarray2array( A, shape, strides, offset, order ) );
 ### Usage
 
 ```c
-TODO
+#include "stdlib/lapack/base/dlaswp.h"
 ```
 
-#### TODO
+#### c\_dlaswp( layout, N, \*A, LDA, k1, k2, \*IPIV, incx )
 
-TODO.
+Performs a series of row interchanges on a matrix `A` using pivot indices stored in `IPIV`.
 
 ```c
-TODO
+#include "stdlib/lapack/base/shared.h"
+
+double A[ 3*2 ] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
+const LAPACK_INT IPIV[ 3 ] = { 2, 0, 1 };
+
+c_dlaswp( LAPACK_ROW_MAJOR, 2, A, 2, 0, 2, IPIV, 1 );
+```
+
+The function accepts the following arguments:
+
+-   **layout**: `[in] LAPACK_LAYOUT` storage layout.
+-   **N**: `[in] LAPACK_INT` number of columns in `A`.
+-   **A**: `[inout] double*` input matrix.
+-   **LDA**: `[in] LAPACK_INT` stride of the first dimension of `A` (a.k.a., leading dimension of the matrix `A`).
+-   **k1**: `[in] LAPACK_INT` index of first row to interchange.
+-   **k2**: `[in] LAPACK_INT` index of last row to interchange.
+-   **IPIV**: `[in] LAPACK_INT*` vector of pivot indices.
+-   **incx**: `[in] LAPACK_INT` increment between successive values of `IPIV`.
+
+```c
+void c_dlaswp( const LAPACK_LAYOUT layout, const LAPACK_INT N, double *A, const LAPACK_INT LDA, const LAPACK_INT k1, const LAPACK_INT k2, const LAPACK_INT *IPIV, const LAPACK_INT incx );
 ```
 
-TODO
+#### c\_dlaswp\_ndarray( N, \*A, sa1, sa2, oa, k1, k2, inck, \*IPIV, si, oi )
+
+Performs a series of row interchanges on a matrix `A` using pivot indices stored in `IPIV` and alternative indexing semantics.
+
+```c
+#include "stdlib/lapack/base/shared.h"
+
+double A[ 3*2 ] = { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
+const LAPACK_INT IPIV[ 3 ] = { 2, 0, 1 };
+
+c_dlaswp_ndarray( 2, A, 2, 1, 0, 0, 2, 1, IPIV, 1, 0 );
+```
+
+The function accepts the following arguments:
+
+-   **N**: `[in] LAPACK_INT` number of columns in `A`.
+-   **A**: `[inout] double*` input matrix.
+-   **sa1**: `[in] LAPACK_INT` stride of the first dimension of `A`.
+-   **sa2**: `[in] LAPACK_INT` stride of the second dimension of `A`.
+-   **oa**: `[in] LAPACK_INT` starting index for `A`.
+-   **k1**: `[in] LAPACK_INT` index of first row to interchange.
+-   **k2**: `[in] LAPACK_INT` index of last row to interchange.
+-   **inck**: `[in] LAPACK_INT` direction in which to apply pivots (-1 to apply pivots in reverse order; otherwise, apply in provided order).
+-   **IPIV**: `[in] LAPACK_INT*` vector of pivot indices.
+-   **si**: `[in] LAPACK_INT` index increment for `IPIV`.
+-   **oi**: `[in] LAPACK_INT` starting index for `IPIV`.
 
 ```c
-TODO
+void c_dlaswp_ndarray( const LAPACK_INT N, double *A, const LAPACK_INT strideA1, const LAPACK_INT strideA2, const LAPACK_INT offsetA, const LAPACK_INT k1, const LAPACK_INT k2, const LAPACK_INT inck, const LAPACK_INT *IPIV, const LAPACK_INT strideIPIV, const LAPACK_INT offsetIPIV );
 ```
 
 </section>
@@ -255,7 +300,34 @@ TODO
 ### Examples
 
 ```c
-TODO
+#include "stdlib/lapack/base/dlaswp.h"
+#include "stdlib/lapack/base/shared.h"
+#include <stdio.h>
+
+int main( void ) {
+    // Define a 3x3 matrix stored in row-major order:
+    double A[ 3*3 ] = {
+        1.0, 2.0, 3.0,
+        4.0, 5.0, 6.0,
+        7.0, 8.0, 9.0
+    };
+
+    // Define a vector of pivot indices:
+    const LAPACK_INT IPIV[ 3 ] = { 2, 0, 1 };
+
+    // Specify the number of columns:
+    const int N = 3;
+
+    // Perform row interchanges:
+    c_dlaswp( LAPACK_ROW_MAJOR, N, A, N, 0, 2, IPIV, 1 );
+
+    // Print the result:
+    for ( int i = 0; i < 3; i++ ) {
+        for ( int j = 0; j < N; j++ ) {
+            printf( "A[ %i, %i ] = %lf\n", i, j, A[ (i*N)+j ] );
+        }
+    }
+}
 ```
 
 </section>

lib/node_modules/@stdlib/lapack/base/dlaswp/benchmark/c/Makefile

@@ -0,0 +1,146 @@
+#/
+# @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.
+#/
+
+# VARIABLES #
+
+ifndef VERBOSE
+	QUIET := @
+else
+	QUIET :=
+endif
+
+# Determine the OS ([1][1], [2][2]).
+#
+# [1]: https://en.wikipedia.org/wiki/Uname#Examples
+# [2]: http://stackoverflow.com/a/27776822/2225624
+OS ?= $(shell uname)
+ifneq (, $(findstring MINGW,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring MSYS,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring CYGWIN,$(OS)))
+	OS := WINNT
+else
+ifneq (, $(findstring Windows_NT,$(OS)))
+	OS := WINNT
+endif
+endif
+endif
+endif
+
+# Define the program used for compiling C source files:
+ifdef C_COMPILER
+	CC := $(C_COMPILER)
+else
+	CC := gcc
+endif
+
+# Define the command-line options when compiling C files:
+CFLAGS ?= \
+	-std=c99 \
+	-O3 \
+	-Wall \
+	-pedantic
+
+# Determine whether to generate position independent code ([1][1], [2][2]).
+#
+# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
+# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
+ifeq ($(OS), WINNT)
+	fPIC ?=
+else
+	fPIC ?= -fPIC
+endif
+
+# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
+INCLUDE ?=
+
+# List of source files:
+SOURCE_FILES ?=
+
+# List of libraries (e.g., `-lopenblas -lpthread`):
+LIBRARIES ?=
+
+# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
+LIBPATH ?=
+
+# List of C targets:
+c_targets := benchmark.size.out
+
+
+# RULES #
+
+#/
+# Compiles source files.
+#
+# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
+# @param {string} [CFLAGS] - C compiler options
+# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
+# @param {string} [SOURCE_FILES] - list of source files
+# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
+# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
+#
+# @example
+# make
+#
+# @example
+# make all
+#/
+all: $(c_targets)
+
+.PHONY: all
+
+#/
+# Compiles C source files.
+#
+# @private
+# @param {string} CC - C compiler (e.g., `gcc`)
+# @param {string} CFLAGS - C compiler options
+# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
+# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
+# @param {string} SOURCE_FILES - list of source files
+# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
+# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
+#/
+$(c_targets): %.out: %.c
+	$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
+
+#/
+# Runs compiled benchmarks.
+#
+# @example
+# make run
+#/
+run: $(c_targets)
+	$(QUIET) ./$<
+
+.PHONY: run
+
+#/
+# Removes generated files.
+#
+# @example
+# make clean
+#/
+clean:
+	$(QUIET) -rm -f *.o *.out
+
+.PHONY: clean