define vars at start of function

src/args.c

@@ -69,27 +69,33 @@ static char *split_arg_value(char *arg) {
 static bool is_digit(char c) { return c >= '0' && c <= '9'; }
 
 static bool is_number(char *value) {
+  unsigned long value_len;
+  unsigned int i;
+
   if (value == NULL) {
     return false;
   }
-  unsigned long value_len = strlen(value);
-  unsigned int i;
+  value_len = strlen(value);
   for (i = 0; i < value_len; i++) {
     if (!is_digit(value[i])) {
       return false;
     }
   }
+
   return true;
 }
 
 static unsigned int parse_uint(char *arg, char *value) {
+  unsigned long long tmp_value;
+
   if (!is_number(value)) {
     invalid_value(arg, value);
   }
-  unsigned long long tmp_value = (unsigned long long)atoll(value);
+  tmp_value = (unsigned long long)atoll(value);
   if (tmp_value >= UINT_MAX) {
     invalid_value(arg, value);
   }
+
   return (unsigned int)tmp_value;
 }
 
@@ -102,6 +108,7 @@ static unsigned long parse_ulong(char *arg, char *value) {
 
 static void parse_color(char *arg, char *value, unsigned int color[3]) {
   char *tmp;
+
   tmp = strtok(value, ",");
   color[0] = parse_uint(arg, tmp);
   tmp = strtok(NULL, ",");
@@ -112,6 +119,10 @@ static void parse_color(char *arg, char *value, unsigned int color[3]) {
 
 Parameters args_parse(int argc, char **argv) {
   Parameters params;
+  unsigned char var_range;
+  bool size_set, slope_set, start_set, var_set, rot_set;
+  int i;
+  char *arg, *value;
 
   params.quiet = false;
   params.seed = (unsigned long)time(NULL);
@@ -120,22 +131,19 @@ Parameters args_parse(int argc, char **argv) {
   params.file_path = "output.bmp";
   params.monochrome = false;
 
-  unsigned char var_range = 30;
+  var_range = 30;
 
-  bool size_set = false;
-  bool slope_set = false;
-  bool start_set = false;
-  bool var_set = false;
-  bool rot_set = false;
+  size_set = false;
+  slope_set = false;
+  start_set = false;
+  var_set = false;
+  rot_set = false;
 
-  int i;
-  char *arg;
-  char *value;
   for (i = 1; i < argc; i++) {
     arg = argv[i];
     value = split_arg_value(arg);
     if (is_arg(arg, "--help")) {
-      print_help(0);
+      print_help(EXIT_SUCCESS);
     } else if (is_arg(arg, "-q") || is_arg(arg, "--quiet")) {
       params.quiet = true;
     } else if (is_arg(arg, "-v") || is_arg(arg, "--version")) {

src/bmp.c

@@ -9,6 +9,7 @@
 static void write_str(unsigned char *buffer, unsigned int offset,
                       unsigned int size, unsigned char *value) {
   unsigned int i;
+
   for (i = 0; i < size; i++) {
     buffer[offset + i] = (unsigned char)value[i];
   }
@@ -17,6 +18,7 @@ static void write_str(unsigned char *buffer, unsigned int offset,
 static void write_num(unsigned char *buffer, unsigned int offset,
                       unsigned int size, unsigned int value) {
   unsigned int i;
+
   for (i = 0; i < size; i++) {
     buffer[offset + i] = (unsigned char)((value >> (8 * i)) & 0xFFu);
   }
@@ -25,6 +27,7 @@ static void write_num(unsigned char *buffer, unsigned int offset,
 static void write_nul(unsigned char *buffer, unsigned int offset,
                       unsigned int size) {
   unsigned int i;
+
   for (i = 0; i < size; i++) {
     buffer[offset + i] = 0;
   }
@@ -32,8 +35,11 @@ static void write_nul(unsigned char *buffer, unsigned int offset,
 
 static unsigned char *bmp_header(unsigned int width, unsigned int height,
                                  unsigned int color_depth) {
-  unsigned char *output = (unsigned char *)malloc(HEADER_SIZE);
-  unsigned int data_length = width * height * color_depth;
+  unsigned char *output;
+  unsigned int data_length;
+
+  output = malloc(HEADER_SIZE * sizeof(unsigned char));
+  data_length = width * height * color_depth;
   // 0x00(2) BM
   write_str(output, 0x00, 0x02, (unsigned char *)"BM");
   // 0x02(4) file size
@@ -70,17 +76,22 @@ static unsigned char *bmp_header(unsigned int width, unsigned int height,
 
 static unsigned int bmp_data_line_length(unsigned int width,
                                          unsigned int color_depth) {
-  unsigned int data_length = width * color_depth;
-  unsigned int line_offset = data_length % 4;
-  unsigned int line_padding = line_offset > 0 ? 4 - line_offset : 0;
+  unsigned int data_length, line_offset, line_padding;
+
+  data_length = width * color_depth;
+  line_offset = data_length % 4;
+  line_padding = line_offset > 0 ? 4 - line_offset : 0;
+
   return data_length + line_padding;
 }
 
 static void bmp_data_line(unsigned char *buffer, unsigned int width,
                           unsigned int color_depth, unsigned char *data) {
-  unsigned int data_length = width * color_depth;
-  unsigned int line_offset = data_length % 4;
-  unsigned int line_padding = line_offset > 0 ? 4 - line_offset : 0;
+  unsigned int data_length, line_offset, line_padding;
+
+  data_length = width * color_depth;
+  line_offset = data_length % 4;
+  line_padding = line_offset > 0 ? 4 - line_offset : 0;
   write_str(buffer, 0, data_length, data);
   if (line_padding > 0) {
     write_nul(buffer, width * color_depth, line_padding);
@@ -91,15 +102,17 @@ void bmp_generate(unsigned int width, unsigned int height,
                   unsigned int color_depth, bool descending, char *file_path,
                   line_fn generate_line) {
   FILE *fptr;
+  unsigned char *header, *data_buffer, *line_buffer;
+  unsigned int data_length, line_length, y;
+
   fptr = fopen(file_path, "w");
-  unsigned char *header = bmp_header(width, height, color_depth);
+  header = bmp_header(width, height, color_depth);
   fwrite(header, HEADER_SIZE, 1, fptr);
   free(header);
-  unsigned int data_length = width * color_depth;
-  unsigned int line_length = bmp_data_line_length(width, color_depth);
-  unsigned char *data_buffer = (unsigned char *)malloc(data_length);
-  unsigned char *line_buffer = (unsigned char *)malloc(line_length);
-  unsigned int y;
+  data_length = width * color_depth;
+  line_length = bmp_data_line_length(width, color_depth);
+  data_buffer = malloc(data_length * sizeof(unsigned char));
+  line_buffer = malloc(line_length * sizeof(unsigned char));
   for (y = 0; y < height; y++) {
     generate_line(y, data_buffer, data_length);
     bmp_data_line(line_buffer, width, color_depth, data_buffer);

src/generator.c

@@ -19,14 +19,18 @@ static unsigned char *current_line;
 static unsigned char generate_pixel(unsigned char depth,
                                     unsigned char top_pixel,
                                     unsigned char left_pixel) {
-  int k = rand_uint(global_params.var[depth] + 1);
-  int v = (rand_uint(2) == 0 ? k : -k) + (left_pixel)*slope +
-          (top_pixel) * (1.0 - slope);
+  int k, v;
+
+  k = rand_uint(global_params.var[depth] + 1);
+  v = (rand_uint(2) == 0 ? k : -k) + (left_pixel)*slope +
+      (top_pixel) * (1.0 - slope);
+
   return (unsigned char)(v < 0 ? 0 : (v > 255 ? (unsigned char)255 : v));
 }
 
 static void generate_line() {
   unsigned int i;
+
   for (i = 0; i < line_width; i++) {
     last_line[i] = current_line[i];
   }
@@ -45,6 +49,7 @@ static void generate_bmp_line(unsigned int y, unsigned char *data_buffer,
                               unsigned int len) {
   unsigned int i;
   unsigned int x;
+
   if (y % global_params.size == 0) {
     generate_line();
   }
@@ -77,14 +82,15 @@ static void debug_parameters(Parameters params) {
 }
 
 static void init(Parameters params) {
+  unsigned int i;
+
   global_params = params;
   slope = ((float)params.slope) / 255.0;
   color_depth = params.monochrome ? 1 : 3;
   debug_parameters(params);
   line_width = ((params.width / params.size) + 1) * color_depth;
-  last_line = (unsigned char *)malloc(line_width);
-  current_line = (unsigned char *)malloc(line_width);
-  unsigned int i = 0;
+  last_line = malloc(line_width * sizeof(unsigned char));
+  current_line = malloc(line_width * sizeof(unsigned char));
   for (i = 0; i < line_width; i++) {
     current_line[i] = params.start[i % color_depth];
   }
@@ -104,10 +110,12 @@ static void print_time(Parameters params, clock_t start) {
 }
 
 void generator_run(Parameters params) {
+  clock_t start;
+
   if (!params.quiet) {
     puts(PACKAGE " " VERSION);
   }
-  clock_t start = clock();
+  start = clock();
   init(params);
   bmp_generate(params.width, params.height, BMP_COLOR_DEPTH,
                params.rotation % 2 == 1, params.file_path, generate_bmp_line);

src/main.c

@@ -1,11 +1,15 @@
-#include "main.h"
+#include <stdlib.h>
+
 #include "args.h"
 #include "generator.h"
+#include "main.h"
 #include "types.h"
 
 int main(int argc, char **argv) {
   Parameters params;
+
   params = args_parse(argc, argv);
   generator_run(params);
-  return 0;
+
+  return EXIT_SUCCESS;
 }

src/rand.c

@@ -5,11 +5,15 @@ static unsigned long long const multiplier = 6364136223846793005u;
 
 // https://en.wikipedia.org/wiki/Permuted_congruential_generator
 static unsigned long rand(void) {
-  unsigned long long x = mcg_state;
-  unsigned count = (unsigned)(x >> 61);
+  unsigned long long x;
+  unsigned count;
+
+  x = mcg_state;
+  count = (unsigned)(x >> 61);
 
   mcg_state = x * multiplier;
   x ^= x >> 22;
+
   return (unsigned long)(x >> (22 + count));
 }
 
@@ -18,6 +22,6 @@ void rand_seed(unsigned long long seed) {
   (void)rand();
 }
 
-unsigned int rand_uint(const unsigned int max) {
+unsigned int rand_uint(unsigned int max) {
   return max == 0 ? 0 : (unsigned int)(rand() % max);
 }