refactor(optimize): use fixed size strings everywhere except for files

src/args.c

@@ -72,7 +72,9 @@ static void invalid_value(char *arg, char *value) {
   print_help(EXIT_FAILURE);
 }
 
-static bool is_arg(char *arg, char *ref) { return strcoll(arg, ref) == 0; }
+static bool is_arg(char *arg, const char *ref) {
+  return strcoll(arg, ref) == 0;
+}
 
 static char *split_arg_value(char *arg) {
   strtok(arg, "=");
@@ -101,9 +103,9 @@ Parameters args_parse(int argc, char **argv) {
   params.output_screen = 0;
   params.monitor = false;
   params.monitor_screen = 0;
-  params.frag_path = DATADIR "/shaders";
-  params.config_path = DATADIR "/default.cfg";
-  params.state_file = "forge_saved_state.txt";
+  strncpy(params.frag_path, DATADIR "/shaders", STR_LEN);
+  strncpy(params.config_path, DATADIR "/default.cfg", STR_LEN);
+  strncpy(params.state_file, "forge_saved_state.txt", STR_LEN);
   params.load_state = true;
   params.save_state = false;
   params.internal_size = 720;
@@ -126,11 +128,11 @@ Parameters args_parse(int argc, char **argv) {
     } else if (is_arg(arg, "-s") || is_arg(arg, "--screen")) {
       params.output_screen = parse_uint(arg, value);
     } else if (is_arg(arg, "-f") || is_arg(arg, "--frag")) {
-      params.frag_path = value;
+      strncpy(params.frag_path, value, STR_LEN);
     } else if (is_arg(arg, "-c") || is_arg(arg, "--config")) {
-      params.config_path = value;
+      strncpy(params.config_path, value, STR_LEN);
     } else if (is_arg(arg, "-sf") || is_arg(arg, "--state-file")) {
-      params.state_file = value;
+      strncpy(params.state_file, value, STR_LEN);
     } else if (is_arg(arg, "-ls") || is_arg(arg, "--load-state")) {
       params.load_state = true;
     } else if (is_arg(arg, "-nls") || is_arg(arg, "--no-load-state")) {
@@ -149,8 +151,7 @@ Parameters args_parse(int argc, char **argv) {
         log_error("maximum video input reached");
         exit(EXIT_FAILURE);
       }
-
-      params.video_in.values[params.video_in.length++] = value;
+      strncpy(params.video_in.values[params.video_in.length++], value, STR_LEN);
     } else if (is_arg(arg, "-vs") || is_arg(arg, "--video-size")) {
       params.video_size = parse_uint(arg, value);
       if (params.video_size == 0) {

src/config.h

@@ -15,6 +15,12 @@
 #define DATADIR "."
 #endif
 
+/* STRINGS */
+
+#ifndef STR_LEN
+#define STR_LEN 1024
+#endif
+
 /* TYPES */
 
 #ifndef MAX_VIDEO

src/config_file.c

@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "config.h"
 #include "config_file.h"
 #include "file.h"
 #include "string.h"
@@ -61,7 +62,7 @@ static void parse_config_file_line(ConfigFile config, char *line) {
   hashmap_set(config.map, &item);
 }
 
-ConfigFile config_file_read(char *path, bool free_path) {
+ConfigFile config_file_read(char *path) {
   File file;
   ConfigFile config;
   char *line;
@@ -82,7 +83,7 @@ ConfigFile config_file_read(char *path, bool free_path) {
     line = strtok(NULL, "\n");
   }
 
-  file_free(&file, free_path);
+  file_free(&file);
 
   return config;
 }
@@ -91,7 +92,7 @@ char *config_file_get_str(ConfigFile config, char *key, char *default_value) {
   ConfigFileItem c_key;
   ConfigFileItem *item;
 
-  strcpy(c_key.key, key);
+  strncpy(c_key.key, key, STR_LEN);
 
   item = (ConfigFileItem *)hashmap_get(config.map, &c_key);
 
@@ -107,7 +108,7 @@ unsigned int config_file_get_int(ConfigFile config, char *key,
   ConfigFileItem c_key;
   ConfigFileItem *item;
 
-  strcpy(c_key.key, key);
+  strncpy(c_key.key, key, STR_LEN);
 
   item = (ConfigFileItem *)hashmap_get(config.map, &c_key);
 

src/config_file.h

@@ -3,7 +3,7 @@
 #ifndef CONFIG_FILE_H
 #define CONFIG_FILE_H
 
-ConfigFile config_file_read(char *path, bool free_path);
+ConfigFile config_file_read(char *path);
 
 char *config_file_get_str(ConfigFile config, char *key, char *default_value);
 

src/file.c

@@ -66,7 +66,7 @@ void file_update(File *file) {
 File file_read(char *path) {
   File file;
 
-  file.path = path;
+  sprintf(file.path, path, STR_LEN);
   file.content = NULL;
   file.error = false;
   file.last_write = 0;
@@ -75,7 +75,7 @@ File file_read(char *path) {
   return file;
 }
 
-void file_write(char *path, ConstStringArray lines) {
+void file_write(char *path, StringArray lines) {
   unsigned int i;
   FILE *file_pointer;
 
@@ -105,9 +105,4 @@ void file_prepend(File *src, File extra) {
   free(old_src_content);
 }
 
-void file_free(File *file, bool free_path) {
-  free(file->content);
-  if (free_path) {
-    free(file->path);
-  }
-}
+void file_free(File *file) { free(file->content); }

src/file.h

@@ -11,8 +11,8 @@ void file_update(File *file);
 
 void file_prepend(File *src, File extra);
 
-void file_free(File *file, bool free_path);
+void file_write(char *path, StringArray lines);
 
-void file_write(char *path, ConstStringArray lines);
+void file_free(File *file);
 
 #endif /* FILE_H */

src/forge.c

@@ -101,11 +101,9 @@ static void hot_reload() {
 
 File read_fragment_shader_file(char *frag_path, unsigned int i) {
   File fragment_shader;
-  char *file_path;
+  char file_path[STR_LEN];
 
-  file_path = malloc(sizeof(char) * 1024);
-
-  sprintf(file_path, "%s/frag%d.glsl", frag_path, i);
+  snprintf(file_path, STR_LEN, "%s/frag%d.glsl", frag_path, i);
   fragment_shader = file_read(file_path);
   if (fragment_shader.error) {
     exit(EXIT_FAILURE);
@@ -134,10 +132,10 @@ static void free_files(unsigned int frag_count) {
   unsigned int i;
 
   for (i = 0; i < frag_count; i++) {
-    file_free(&fragment_shaders.values[i], true);
+    file_free(&fragment_shaders.values[i]);
   }
 
-  file_free(&common_shader_code, true);
+  file_free(&common_shader_code);
 }
 
 static void init_inputs(StringArray video_in, unsigned int video_size) {
@@ -237,7 +235,7 @@ void forge_run(Parameters params) {
 
   context->stop = false;
 
-  config = config_file_read(params.config_path, false);
+  config = config_file_read(params.config_path);
 
   frag_count = config_file_get_int(config, "FRAG_COUNT", 1);
   in_count = config_file_get_int(config, "IN_COUNT", 0);

src/midi.c

@@ -1,13 +1,14 @@
 #include <GLFW/glfw3.h>
 #include <alsa/asoundlib.h>
 
+#include "config.h"
 #include "log.h"
 #include "types.h"
 
 MidiDevice midi_open(char *name) {
   MidiDevice device;
 
-  device.name = name;
+  strncpy(device.name, name, STR_LEN);
   device.input = NULL;
   device.output = NULL;
 

src/state.c

@@ -319,13 +319,13 @@ bool state_background_midi_write(SharedContext *context,
   return false;
 }
 
-void state_load(SharedContext *context, StateConfig state_config,
-                char *state_file) {
+static void state_load(SharedContext *context, StateConfig state_config,
+                       char *state_file) {
   ConfigFile saved_state;
   char key[100];
   unsigned int i;
 
-  saved_state = config_file_read(state_file, false);
+  saved_state = config_file_read(state_file);
 
   tempo_set(&context->tempo,
             config_file_get_int(saved_state, "tempo", context->tempo.tempo));
@@ -402,7 +402,7 @@ void state_randomize(SharedContext *context, StateConfig state_config) {
 
 void state_save(SharedContext *context, StateConfig state_config,
                 char *state_file) {
-  ConstStringArray lines;
+  StringArray lines;
   unsigned int i;
 
   log_info("Saving state to '%s'...", state_file);

src/types.h

@@ -21,14 +21,13 @@
   } X
 
 typedef ARRAY(UintArray, unsigned int);
-typedef ARRAY(StringArray, char *);
 typedef ARRAY(Vec3Array, vec3);
 typedef ARRAY(GLuintArray, GLuint);
 
-typedef struct ConstStringArray {
-  char values[ARRAY_SIZE][1000];
+typedef struct StringArray {
+  char values[ARRAY_SIZE][STR_LEN];
   unsigned int length;
-} ConstStringArray;
+} StringArray;
 
 typedef struct Parameters {
   bool hot_reload;
@@ -36,9 +35,9 @@ typedef struct Parameters {
   unsigned int output_screen;
   bool monitor;
   unsigned int monitor_screen;
-  char *frag_path;
-  char *config_path;
-  char *state_file;
+  char frag_path[STR_LEN];
+  char config_path[STR_LEN];
+  char state_file[STR_LEN];
   bool load_state;
   bool save_state;
   unsigned int internal_size;
@@ -54,8 +53,9 @@ typedef struct Vertex {
 } Vertex;
 
 typedef struct File {
-  char *path;
+  char path[STR_LEN];
   char *content;
+  unsigned int length;
   bool error;
   time_t last_write;
 } File;
@@ -117,7 +117,7 @@ typedef struct ShaderProgram {
 } ShaderProgram;
 
 typedef struct VideoCapture {
-  char *name;
+  char name[STR_LEN];
   bool error;
   int fd;
   int exp_fd;
@@ -198,13 +198,13 @@ typedef struct ConfigFile {
 } ConfigFile;
 
 typedef struct ConfigFileItem {
-  char key[256];
-  char value[2048];
+  char key[STR_LEN];
+  char value[STR_LEN];
 } ConfigFileItem;
 
 typedef struct MidiDevice {
   bool error;
-  char *name;
+  char name[STR_LEN];
   snd_rawmidi_t *input;
   snd_rawmidi_t *output;
 } MidiDevice;

src/video.c

@@ -8,6 +8,7 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
+#include "config.h"
 #include "timer.h"
 #include "types.h"
 #include "video.h"
@@ -66,7 +67,7 @@ static void ioctl_error(VideoCapture *video_capture, const char *operation,
 static VideoCapture open_device(char *name) {
   VideoCapture video_capture;
 
-  video_capture.name = name;
+  strncpy(video_capture.name, name, STR_LEN);
   video_capture.error = false;
   video_capture.fd = -1;