winebuild: fix random generator like winegcc

Signed-off-by: Marko Semet <marko@marko10-000.de>

tools/winebuild/utils.c

@@ -1278,21 +1278,28 @@ const char *get_asm_string_section(void)
 
 /* xorshift* random generator. Source: https://en.wikipedia.org/wiki/Xorshift#xorshift* */
 static uint64_t pseudorandom_state = 1;
-extern char **environ;
+static const char* pseudorandom_source = NULL;
+static size_t pseudorandom_source_size = 0;
 
-uint64_t pseudorandom(uint64_t add_to_state)
+static uint64_t pseudorandom_algo(uint64_t* generator_state, uint64_t add_to_state)
 {
-    uint64_t tmp = pseudorandom_state + add_to_state;
+    uint64_t tmp = (*generator_state) + add_to_state;
     tmp ^= tmp >> 12;
     tmp ^= tmp << 25;
     tmp ^= tmp >> 27;
-    pseudorandom_state = tmp;
+    (*generator_state) = tmp;
     return tmp * UINT64_C(0x2545F4914F6CDD1D);
 }
 
+uint64_t pseudorandom(uint64_t add_to_state)
+{
+    return pseudorandom_algo(&pseudorandom_state, add_to_state);
+}
+
 char pseudorandom_char(void)
 {
-    char tmp = (char) (pseudorandom(0) % 62);
+    char tmp;
+    tmp = (char) (pseudorandom(0) % 62);
     if (tmp < 10)
     {
         return '0' + tmp;
@@ -1309,18 +1316,26 @@ char pseudorandom_char(void)
 
 int pseudorandom_tempfile(char* file)
 {
+    /* variables */
+    int result;
+
+    int counter;
+    char *filename_pos;
+
+    char *debug_filename;
+    FILE *debug_file;
+
     /* replaces Xs */
-    for (char* tmp = file; (*tmp) != 0; tmp++)
+    for (filename_pos = file; (*filename_pos) != 0; filename_pos++)
     {
-        if ((*tmp) == 'X')
+        if ((*filename_pos) == 'X')
         {
-            (*tmp) = pseudorandom_char();
+            (*filename_pos) = pseudorandom_char();
         }
     }
 
     /* try to open file */
-    int result;
-    int counter = 0;
+    counter = 0;
     do
     {
         result = open(file, O_CREAT | O_EXCL | O_RDWR, 0600);
@@ -1331,52 +1346,116 @@ int pseudorandom_tempfile(char* file)
         sleep(5);
         counter++;
     } while (counter <= 12);
+
+    /* add deebug info */
+    if ((result != -1) && (getenv("SOURCE_RANDOM_DEBUG") != NULL))
+    {
+        debug_filename = strmake("%s.random_debug", file);
+        debug_file = fopen(debug_filename, "wb");
+        fwrite(pseudorandom_source, 1, pseudorandom_source_size, debug_file);
+        fclose(debug_file);
+        free(debug_filename);
+    }
     return result;
 }
 
 void init_random_generator(int argc, char **argv)
 {
+    /* variables */
+    uint64_t generator_state;
+
+    void *argv_data;
+    size_t argv_size;
+
+    unsigned int counter;
+    void *env_data;
+    size_t env_size;
+    char **tmp_envs;
+
+    char *buffer_pos;
+    char **env;
+    size_t length;
+
+    unsigned int i;
+    size_t j;
+
     /* process environment */
+    generator_state = 1;
+    env_size = 0;
     {
-        /* copy environment variables and sort them */
-        char **tmp_envs;
-        unsigned int counter = 0;
-        for (const char **env = environ; (*env) != 0; env++, counter++) {}
-        tmp_envs = (char**) malloc(sizeof(char*) * counter);
-        for (unsigned int i = 0; i < counter; i++)
+        /* sort environment variables */
+        counter = 0;
+        for (env = environ; (*env) != NULL; env++)
         {
-            size_t length = strlen(environ[i]) + 1;
-            char* tmp = malloc(length);
-            memcpy(tmp, environ[i], length);
-            tmp_envs[i] = tmp;
+            counter++;
+            env_size += strlen(*env) + 1;
+        }
+        tmp_envs = (char**) malloc(sizeof(char*) * counter);
+        for (i = 0; i < counter; i++)
+        {
+            tmp_envs[i] = (char*) (environ[i]);
         }
         qsort(tmp_envs, counter, sizeof(char*), (int(*)(const void*, const void*)) &strcmp);
 
-        /* add sorted environment to random generator */
-        for (unsigned int i = 0; i < counter; i++)
+        /* and copy them */
+        env_data = malloc(env_size * sizeof(char));
+        buffer_pos = env_data;
+        for (i = 0; i < counter; i++)
         {
-            size_t j_max = strlen(tmp_envs[i]);
-            for (size_t j = 0; j < j_max; j++)
-            {
-                pseudorandom(tmp_envs[i][j]);
-            }
+            length = strlen(tmp_envs[i]) + 1;
+            memcpy(buffer_pos, tmp_envs[i], length);
+            buffer_pos += length;
+        }
+
+        /* add sorted environment to random generator */
+        for (j = 0; j < env_size; j++)
+        {
+            pseudorandom_algo(&generator_state, ((unsigned char*) env_data)[j]);
         }
 
         /* free temp environment */
-        for (unsigned int i = 0; i < counter; i++)
-        {
-            free(tmp_envs[i]);
-        }
         free(tmp_envs);
     }
 
-    /* process argv */
-    for (int i = 0; i < argc; i++)
+    /* copy argv */
+    argv_size = 0;
+    for (i = 0; i < argc; i++)
     {
-        size_t j_max = strlen(argv[i]);
-        for (size_t j = 0; j < j_max; j++)
-        {
-            pseudorandom(argv[i][j]);
-        }
+        argv_size += strlen(argv[i]) + 1;
     }
+    argv_data = malloc(sizeof(char) * argv_size);
+    buffer_pos = argv_data;
+    for (i = 0; i < argc; i++)
+    {
+        length = strlen(argv[i]) + 1;
+        memcpy(buffer_pos, argv[i], length);
+        buffer_pos += length;
+    }
+
+    /* add arguments to gnerator */
+    for (j = 0; j < argv_size; j++)
+    {
+        pseudorandom_algo(&generator_state, ((unsigned char*) argv_data)[j]);
+    }
+
+    /* add debug if required */
+    if (getenv("SOURCE_RANDOM_DEBUG") != NULL)
+    {
+        /* gen field */
+        pseudorandom_source_size = env_size + argv_size + sizeof(generator_state);
+        buffer_pos = malloc(sizeof(char) * pseudorandom_source_size);
+        pseudorandom_source = buffer_pos;
+
+        /* copy data into it */
+        memcpy(buffer_pos, env_data, env_size);
+        buffer_pos += env_size;
+        memcpy(buffer_pos, argv_data, argv_size);
+        buffer_pos += argv_size;
+        memcpy(buffer_pos, &generator_state, sizeof(generator_state));
+    }
+
+    /* set state and free rest */
+    free(env_data);
+    free(argv_data);
+    pseudorandom_state = generator_state;
 }