From 4f56d6edd72e62b9fde3007244cf588edea6b376 Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sat, 25 Nov 2023 21:31:23 +0100
Subject: [PATCH 1/8] Remove executable flag from source files.

---
 gnuplot_i.c | 0
 gnuplot_i.h | 0
 2 files changed, 0 insertions(+), 0 deletions(-)
 mode change 100755 => 100644 gnuplot_i.c
 mode change 100755 => 100644 gnuplot_i.h

diff --git a/gnuplot_i.c b/gnuplot_i.c
old mode 100755
new mode 100644
diff --git a/gnuplot_i.h b/gnuplot_i.h
old mode 100755
new mode 100644

From 658b79e0966baf0a01c5b593a83a92f6cf19e13a Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sat, 25 Nov 2023 21:50:16 +0100
Subject: [PATCH 2/8] Add cmake support and C++ support.

---
 CMakeLists.txt | 24 ++++++++++++++++++++++++
 gnuplot_i.h    |  8 ++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..2c1d6f0
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.12...3.27)
+
+project(gnuplot_i
+  DESCRIPTION "A gnuplot interface library written in C."
+  LANGUAGES C
+)
+
+# This project is an OBJECT-library, used by other git submodules and the main project.
+add_library(gnuplot_i_ObjLib OBJECT)
+
+# The list of source files.
+target_sources(gnuplot_i_ObjLib
+  PRIVATE
+    "gnuplot_i.c"
+    "gnuplot_i.h"
+)
+
+target_include_directories(gnuplot_i_ObjLib
+  INTERFACE
+    "${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+# Create an ALIAS target.
+add_library(gnuplot_i::gnuplot_i ALIAS gnuplot_i_ObjLib)
diff --git a/gnuplot_i.h b/gnuplot_i.h
index 463e234..5afa670 100644
--- a/gnuplot_i.h
+++ b/gnuplot_i.h
@@ -23,6 +23,10 @@
 /** Maximum amount of characters of a temporary file name */
 #define GP_TMP_NAME_SIZE 512
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*---------------------------------------------------------------------------
   Gnuplot_i types
  ---------------------------------------------------------------------------*/
@@ -102,4 +106,8 @@ void gnuplot_plot_once (char *style, char *label_x, char *label_y, double *x, do
 void gnuplot_plot_equation (gnuplot_ctrl *handle, char *equation, char *title);
 void gnuplot_hardcopy (gnuplot_ctrl *handle, char *filename, char *color);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

From 581be6e0c116c0f63147cf2358202019bf082994 Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sat, 25 Nov 2023 22:15:48 +0100
Subject: [PATCH 3/8] Fix constness.

Can't pass a string literal to a char*.
---
 examples/example.c |  2 +-
 gnuplot_i.c        | 32 ++++++++++++++++----------------
 gnuplot_i.h        | 28 ++++++++++++++--------------
 3 files changed, 31 insertions(+), 31 deletions(-)

diff --git a/examples/example.c b/examples/example.c
index c3db5be..a215c08 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -174,7 +174,7 @@ int main(int argc, char *argv[]) {
   h3 = gnuplot_init();
   gnuplot_setstyle(h3, "filledcurves");
   printf("window 1: x*sin(x)\n");
-  gnuplot_cmd(h1, "set linecolor rgb 'blue'");   // this does not work yet
+  gnuplot_cmd(h1, "set style line 1 lc rgb 'blue'");    // Still not working, but doesn't print an error anymore.
   gnuplot_plot_equation(h1, "x*sin(x)", "x*sin(x)");
   sleep(SECONDS);
   printf("window 2: log(x)/x\n");
diff --git a/gnuplot_i.c b/gnuplot_i.c
index e8ecd0e..4e6d68d 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -79,7 +79,7 @@
  */
 /*-------------------------------------------------------------------------*/
 
-int mkstemp (char *name) {
+int mkstemp (char const* name) {
   srand(time(NULL));
   int i;
   char *start = strstr(name, "XXXXXX");
@@ -125,9 +125,9 @@ int mkstemp (char *name) {
  */
 /*-------------------------------------------------------------------------*/
 
-char *gnuplot_get_program_path (char *pname) {
+char const* gnuplot_get_program_path (char const* pname) {
   int i, j, lg;
-  char *path;
+  char const* path;
   static char buf[PATH_MAXNAMESZ];
 
   /* Trivial case: try in current working directory */
@@ -297,7 +297,7 @@ void gnuplot_close (gnuplot_ctrl *handle) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_cmd (gnuplot_ctrl *handle, char *cmd, ...) {
+void gnuplot_cmd (gnuplot_ctrl *handle, char const* cmd, ...) {
   va_list ap;
   char local_cmd[GP_CMD_SIZE];
 
@@ -330,7 +330,7 @@ void gnuplot_cmd (gnuplot_ctrl *handle, char *cmd, ...) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_setstyle (gnuplot_ctrl *handle, char *plot_style) {
+void gnuplot_setstyle (gnuplot_ctrl *handle, char const* plot_style) {
   if (strcmp(plot_style, "lines") &&
       strcmp(plot_style, "points") &&
       strcmp(plot_style, "linespoints") &&
@@ -371,7 +371,7 @@ void gnuplot_setstyle (gnuplot_ctrl *handle, char *plot_style) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_setterm (gnuplot_ctrl *handle, char *terminal, int width, int height) {
+void gnuplot_setterm (gnuplot_ctrl *handle, char const* terminal, int width, int height) {
   char cmd[GP_CMD_SIZE];
 
   strncpy(handle->term, terminal, 32);
@@ -399,7 +399,7 @@ void gnuplot_setterm (gnuplot_ctrl *handle, char *terminal, int width, int heigh
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_set_axislabel (gnuplot_ctrl *handle, char *axis, char *label) {
+void gnuplot_set_axislabel (gnuplot_ctrl *handle, char const* axis, char const* label) {
   char cmd[GP_CMD_SIZE];
 
   sprintf(cmd, "set %slabel \"%s\"", axis, label);
@@ -482,7 +482,7 @@ void gnuplot_i_error (gnuplot_ctrl *handle) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char *title) {
+void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -547,7 +547,7 @@ void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char *title) {
+void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -599,7 +599,7 @@ void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char *title) {
+void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -672,7 +672,7 @@ void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int col
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char *title) {
+void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -733,7 +733,7 @@ void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char *title) {
+void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -813,7 +813,7 @@ void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *
  */
 /*-------------------------------------------------------------------------*/
 
-void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char *title) {
+void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -866,7 +866,7 @@ void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_plot_once (char *style, char *label_x, char *label_y, double *x, double *y, int n, char *title) {
+void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double *x, double *y, int n, char const* title) {
   /* Define handle as local variable to isolate it from other gnuplot sessions */
   gnuplot_ctrl *handle;
 
@@ -909,7 +909,7 @@ void gnuplot_plot_once (char *style, char *label_x, char *label_y, double *x, do
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_plot_equation (gnuplot_ctrl *handle, char *equation, char *title) {
+void gnuplot_plot_equation (gnuplot_ctrl *handle, char const* equation, char const* title) {
   char cmd[GP_CMD_SIZE];
 
   sprintf(cmd, "%s %s title \"%s\" with %s", (handle->nplots > 0) ? "replot" : "plot", equation, (title) ? title : "No title", handle->pstyle);
@@ -944,7 +944,7 @@ void gnuplot_plot_equation (gnuplot_ctrl *handle, char *equation, char *title) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_hardcopy (gnuplot_ctrl *handle, char *filename, char *color) {
+void gnuplot_hardcopy (gnuplot_ctrl *handle, char const* filename, char const* color) {
   if (color == NULL) {
     gnuplot_cmd(handle, "set terminal postscript");
   } else {
diff --git a/gnuplot_i.h b/gnuplot_i.h
index 5afa670..332fa46 100644
--- a/gnuplot_i.h
+++ b/gnuplot_i.h
@@ -81,30 +81,30 @@ typedef struct _GNUPLOT_POINT_ {
 
 /* Auxiliary functions */
 
-char *gnuplot_get_program_path (char *pname);
+char const* gnuplot_get_program_path (char const* pname);
 void print_gnuplot_handle (gnuplot_ctrl *handle);
 
 /* Gnuplot interface handling functions */
 
 gnuplot_ctrl *gnuplot_init (void);
 void gnuplot_close (gnuplot_ctrl *handle);
-void gnuplot_cmd (gnuplot_ctrl *handle, char *cmd, ...);
-void gnuplot_setstyle (gnuplot_ctrl *handle, char *plot_style);
-void gnuplot_setterm (gnuplot_ctrl *handle, char *terminal, int width, int height);
-void gnuplot_set_axislabel (gnuplot_ctrl *handle, char *axis, char *label);
+void gnuplot_cmd (gnuplot_ctrl *handle, char const* cmd, ...);
+void gnuplot_setstyle (gnuplot_ctrl *handle, char const* plot_style);
+void gnuplot_setterm (gnuplot_ctrl *handle, char const* terminal, int width, int height);
+void gnuplot_set_axislabel (gnuplot_ctrl *handle, char const* axis, char const* label);
 void gnuplot_resetplot (gnuplot_ctrl *handle);
 
 /* Gnuplot interface plotting functions */
 
-void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char *title);
-void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char *title);
-void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char *title);
-void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char *title);
-void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char *title);
-void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char *title);
-void gnuplot_plot_once (char *style, char *label_x, char *label_y, double *x, double *y, int n, char *title);
-void gnuplot_plot_equation (gnuplot_ctrl *handle, char *equation, char *title);
-void gnuplot_hardcopy (gnuplot_ctrl *handle, char *filename, char *color);
+void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char const* title);
+void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char const* title);
+void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char const* title);
+void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char const* title);
+void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title);
+void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title);
+void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double *x, double *y, int n, char const* title);
+void gnuplot_plot_equation (gnuplot_ctrl *handle, char const* equation, char const* title);
+void gnuplot_hardcopy (gnuplot_ctrl *handle, char const* filename, char const* color);
 
 #ifdef __cplusplus
 }

From 36e440e0681c5f92d47ceba861bc64683b7019a4 Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sun, 26 Nov 2023 00:14:38 +0100
Subject: [PATCH 4/8] Do not call gnuplot_i_error in functions that use
 plot/replot.

---
 gnuplot_i.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/gnuplot_i.c b/gnuplot_i.c
index 4e6d68d..190be79 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -489,7 +489,6 @@ void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n
 
   /* Error handling: mandatory arguments, already open session, opening temporary file */
   FAIL_IF (x == NULL || (n < 1), "One of the parameters to gnuplot_plot_coordinates() has been misspecified");
-  gnuplot_i_error(handle);
 
   /* Open temporary file for output */
   sprintf(name, GNUPLOT_TEMPFILE, P_tmpdir);
@@ -820,7 +819,6 @@ void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void
 
   /* Error handling: mandatory arguments, already open session, opening temporary file */
   FAIL_IF (getPoint == NULL || (n < 1), "One of the parameters to gnuplot_plot_obj_xy() has been misspecified");
-  gnuplot_i_error(handle);
 
   /* Open temporary file for output */
   sprintf(name, GNUPLOT_TEMPFILE, P_tmpdir);

From 0068d1cb9880859701cb92627aba23e5c7908d7d Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sun, 26 Nov 2023 00:15:12 +0100
Subject: [PATCH 5/8] Allow appending a plot style.

For example,
gnuplot_append_style(h1, " pointtype 4 pointsize 2 linewidth 2 linecolor 'green'");
---
 gnuplot_i.c | 6 ++++++
 gnuplot_i.h | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/gnuplot_i.c b/gnuplot_i.c
index 190be79..515f7dc 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -349,6 +349,12 @@ void gnuplot_setstyle (gnuplot_ctrl *handle, char const* plot_style) {
   return;
 }
 
+void gnuplot_append_style (gnuplot_ctrl *handle, char const* plot_style) {
+  int len = strlen(handle->pstyle);
+  strncpy(handle->pstyle + len, plot_style, sizeof(handle->pstyle) - len - 1);
+  return;
+}
+
 /*-------------------------------------------------------------------------*/
 /**
   @brief    Change the terminal of a gnuplot session.
diff --git a/gnuplot_i.h b/gnuplot_i.h
index 332fa46..ac243b8 100644
--- a/gnuplot_i.h
+++ b/gnuplot_i.h
@@ -51,7 +51,7 @@ extern "C" {
 typedef struct _GNUPLOT_CTRL_ {
   FILE *gnucmd;       /*!< Pipe to gnuplot process. */
   int nplots;         /*!< Number of currently active plots. */
-  char pstyle[32];    /*!< Current plotting style. */
+  char pstyle[256];   /*!< Current plotting style. */
   char term[32];      /*!< Save terminal name, used by `gnuplot_hardcopy()` function. */
   char to_delete[GP_MAX_TMP_FILES][GP_TMP_NAME_SIZE];   /*!< Names of temporary files. */
   int ntmp;           /*!< Number of temporary files in the current session. */
@@ -90,6 +90,7 @@ gnuplot_ctrl *gnuplot_init (void);
 void gnuplot_close (gnuplot_ctrl *handle);
 void gnuplot_cmd (gnuplot_ctrl *handle, char const* cmd, ...);
 void gnuplot_setstyle (gnuplot_ctrl *handle, char const* plot_style);
+void gnuplot_append_style (gnuplot_ctrl *handle, char const* plot_style);
 void gnuplot_setterm (gnuplot_ctrl *handle, char const* terminal, int width, int height);
 void gnuplot_set_axislabel (gnuplot_ctrl *handle, char const* axis, char const* label);
 void gnuplot_resetplot (gnuplot_ctrl *handle);

From baf94d29e002d921e6f42fe980fcc4021ed093ee Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sun, 26 Nov 2023 00:34:17 +0100
Subject: [PATCH 6/8] More const correctness.

---
 gnuplot_i.c | 10 +++++-----
 gnuplot_i.h | 10 +++++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/gnuplot_i.c b/gnuplot_i.c
index 515f7dc..8d494fa 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -488,7 +488,7 @@ void gnuplot_i_error (gnuplot_ctrl *handle) {
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char const* title) {
+void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double const* x, double const* y, int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -552,7 +552,7 @@ void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char const* title) {
+void gnuplot_splot (gnuplot_ctrl *handle, double const* x, double const* y, double const* z, int n, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -604,7 +604,7 @@ void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char const* title) {
+void gnuplot_splot_grid (gnuplot_ctrl *handle, double const* points, int rows, int cols, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -677,7 +677,7 @@ void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int col
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char const* title) {
+void gnuplot_contour_plot (gnuplot_ctrl *handle, double const* x, double const* y, double const* z, int nx, int ny, char const* title) {
   int tmpfd;
   char name[NAME_SIZE];
   char cmd[GP_CMD_SIZE];
@@ -870,7 +870,7 @@ void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void
  */
 /*--------------------------------------------------------------------------*/
 
-void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double *x, double *y, int n, char const* title) {
+void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double const* x, double const* y, int n, char const* title) {
   /* Define handle as local variable to isolate it from other gnuplot sessions */
   gnuplot_ctrl *handle;
 
diff --git a/gnuplot_i.h b/gnuplot_i.h
index ac243b8..2ec1e33 100644
--- a/gnuplot_i.h
+++ b/gnuplot_i.h
@@ -97,13 +97,13 @@ void gnuplot_resetplot (gnuplot_ctrl *handle);
 
 /* Gnuplot interface plotting functions */
 
-void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double *x, double *y, int n, char const* title);
-void gnuplot_splot (gnuplot_ctrl *handle, double *x, double *y, double *z, int n, char const* title);
-void gnuplot_splot_grid (gnuplot_ctrl *handle, double *points, int rows, int cols, char const* title);
-void gnuplot_contour_plot (gnuplot_ctrl *handle, double *x, double *y, double *z, int nx, int ny, char const* title);
+void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double const* x, double const* y, int n, char const* title);
+void gnuplot_splot (gnuplot_ctrl *handle, double const* x, double const* y, double const* z, int n, char const* title);
+void gnuplot_splot_grid (gnuplot_ctrl *handle, double const* points, int rows, int cols, char const* title);
+void gnuplot_contour_plot (gnuplot_ctrl *handle, double const* x, double const* y, double const* z, int nx, int ny, char const* title);
 void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title);
 void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *, gnuplot_point *, int, int), int n, char const* title);
-void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double *x, double *y, int n, char const* title);
+void gnuplot_plot_once (char const* style, char const* label_x, char const* label_y, double const* x, double const* y, int n, char const* title);
 void gnuplot_plot_equation (gnuplot_ctrl *handle, char const* equation, char const* title);
 void gnuplot_hardcopy (gnuplot_ctrl *handle, char const* filename, char const* color);
 

From cac0cc254df80a6aba16bcf4e122ee230a208b83 Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Sat, 2 Dec 2023 17:01:21 +0100
Subject: [PATCH 7/8] I don't even want to know what that memcpy is SUPPOSED to
 do...

---
 gnuplot_i.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gnuplot_i.c b/gnuplot_i.c
index 8d494fa..3b1848c 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -506,7 +506,7 @@ void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double const* x, double con
 
   /* Write data to this file */
   for (int i = 0; i < n; i++) {
-    (y == NULL || memcmp(y, y+1, (sizeof(y)-1)*sizeof(y[0])) == 0) ? sprintf(cmd, "%g\n", x[i]) : sprintf(cmd, "%g %g\n", x[i], y[i]);
+    (y == NULL) ? sprintf(cmd, "%g\n", x[i]) : sprintf(cmd, "%g %g\n", x[i], y[i]);
     write(tmpfd, cmd, strlen(cmd));
   }
   close(tmpfd);

From f5671706600f82f69ccc06cfddb514eb9c86daed Mon Sep 17 00:00:00 2001
From: Carlo Wood <carlo@alinoe.com>
Date: Wed, 13 Dec 2023 16:40:11 +0100
Subject: [PATCH 8/8] Fix notitle

---
 gnuplot_i.c | 44 +++++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 13 deletions(-)

diff --git a/gnuplot_i.c b/gnuplot_i.c
index 3b1848c..ae175c5 100644
--- a/gnuplot_i.c
+++ b/gnuplot_i.c
@@ -310,6 +310,26 @@ void gnuplot_cmd (gnuplot_ctrl *handle, char const* cmd, ...) {
   return;
 }
 
+void send_plot_cmd(gnuplot_ctrl* handle, char* cmd, char const* name, char const* title)
+{
+  char const* command = (handle->nplots > 0) ? "replot" : "plot";
+  if (title)
+    sprintf(cmd, "%s \"%s\" title \"%s\" with %s", command, name, title, handle->pstyle);
+  else
+    sprintf(cmd, "%s \"%s\" notitle with %s", command, name, handle->pstyle);
+  gnuplot_cmd(handle, cmd);
+}
+
+void send_splot_cmd(gnuplot_ctrl* handle, char* cmd, char const* name, char const* title)
+{
+  char const* command = "splot";
+  if (title)
+    sprintf(cmd, "%s \"%s\" title \"%s\" with %s", command, name, title, handle->pstyle);
+  else
+    sprintf(cmd, "%s \"%s\" notitle with %s", command, name, handle->pstyle);
+  gnuplot_cmd(handle, cmd);
+}
+
 /*-------------------------------------------------------------------------*/
 /**
   @brief    Change the plotting style of a gnuplot session.
@@ -512,8 +532,7 @@ void gnuplot_plot_coordinates (gnuplot_ctrl *handle, double const* x, double con
   close(tmpfd);
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "%s \"%s\" title \"%s\" with %s", (handle->nplots > 0) ? "replot" : "plot", name, (title) ? title : "No title" , handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_plot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -577,8 +596,7 @@ void gnuplot_splot (gnuplot_ctrl *handle, double const* x, double const* y, doub
   close(tmpfd);
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "splot \"%s\" title \"%s\" with %s", name, (title) ? title : "No title", handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_splot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -633,8 +651,7 @@ void gnuplot_splot_grid (gnuplot_ctrl *handle, double const* points, int rows, i
   close(tmpfd);
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "splot \"%s\" title \"%s\" with %s", name, (title) ? title : "No title", handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_splot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -712,8 +729,7 @@ void gnuplot_contour_plot (gnuplot_ctrl *handle, double const* x, double const*
   gnuplot_cmd(handle, "set view 0,0");
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "splot \"%s\" title \"%s\" with %s", name, (title) ? title : "No title", handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_splot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -765,8 +781,7 @@ void gnuplot_splot_obj (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void *
   close(tmpfd);
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "splot \"%s\" title \"%s\" with %s", name, (title) ? title : "No title", handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_splot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -844,8 +859,7 @@ void gnuplot_plot_obj_xy (gnuplot_ctrl *handle, void *obj, void (*getPoint)(void
   close(tmpfd);
 
   /* Command to be sent to gnuplot */
-  sprintf(cmd, "%s \"%s\" title \"%s\" with %s", (handle->nplots > 0) ? "replot" : "plot", name, (title) ? title : "No title", handle->pstyle);
-  gnuplot_cmd(handle, cmd);
+  send_plot_cmd(handle, cmd, name, title);
   handle->nplots++;
 }
 
@@ -916,7 +930,11 @@ void gnuplot_plot_once (char const* style, char const* label_x, char const* labe
 void gnuplot_plot_equation (gnuplot_ctrl *handle, char const* equation, char const* title) {
   char cmd[GP_CMD_SIZE];
 
-  sprintf(cmd, "%s %s title \"%s\" with %s", (handle->nplots > 0) ? "replot" : "plot", equation, (title) ? title : "No title", handle->pstyle);
+  char const* command = (handle->nplots > 0) ? "replot" : "plot";
+  if (title)
+    sprintf(cmd, "%s %s title \"%s\" with %s", command, equation, title, handle->pstyle);
+  else
+    sprintf(cmd, "%s %s notitle with %s", command, equation, handle->pstyle);
   gnuplot_cmd(handle, cmd);
   handle->nplots++;
 }