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#define RAND() ((unsigned int)((rand() & 0xff) | ((rand() & 0xff) << 8) | ((rand() & 0xff) << 16) | ((rand() & 0xff) << 24)))
#define GIGA               (uint64_t)((uint64_t)0x400*(uint64_t)0x400*(uint64_t)0x400)
#define MAX_LENGTH_SECTION 0x1f
#define MAX_LENGTH_TEXT    0x7f
#define MAX_LENGTH_BUF     0xff
#define MAX_UINT32         0xffffffff
 
static char const* asz_mon[12] = {
"Jan","Feb","Mar","Apr","May","Jun",
"Jul","Aug","Sep","Oct","Nov","Dec"};
 
static char* gen_string1(char* sz_string, size_t u_length) {
 
	unsigned char* psz_string = (unsigned char*)sz_string;
	unsigned char* psz_string_end = (unsigned char*)sz_string + u_length;
 
	for (; psz_string < psz_string_end; ++psz_string) {
		*psz_string = 0x21 + (RAND() % 94);
	}
 
	*psz_string = '\0';
	return sz_string;
}
 
static char* gen_string2(char* sz_string, size_t u_length) {
 
	unsigned char c;
	char* psz_string = sz_string;
	char* psz_string_end = sz_string + u_length;
 
	for (; psz_string < psz_string_end; ++psz_string) {
		c = RAND() % 52;
		if (c < 26) {
			*psz_string = 'A' + c;
		} else {
			*psz_string = 'a' + (c -26);
		}
	}
 
	*psz_string = '\0';
	return sz_string;
}
 
int gen_data(FILE* fp, size_t u_GiB) {
 
	char sz_buf[MAX_LENGTH_BUF+1];
 
	unsigned int u_string_recs;
	unsigned int u_hatena;
	unsigned int u_xy_recs;
	unsigned int u_num_recs;
	char x_or_y;
	time_t u_time = time(NULL);
	tm*    pt_tm = ::localtime(&u_time);
	uint64_t u_pos;
 
	::srand((unsigned int)time(NULL));
 
	for (;;) {
		// ①ｾｸｼｮﾝ名
		// ex. SECTION_NAME　①
		::fprintf(fp, "%s\x0a", gen_string2(sz_buf, 1 + (RAND() % MAX_LENGTH_SECTION)));
 
		// ②ｾｸｼｮﾝ集計値
		// ex. 11200 11200 2 Jun  9 23:23:00 2018　②
//		u_xy_recs = RAND() % 0x8000000 + 1;
		u_xy_recs = RAND() % 0x8000 + 1;
		u_hatena  = u_xy_recs;
		u_string_recs = RAND() % 0x20 + 1;
		::sprintf(sz_buf, "%s %.2d %02d:%02d:%02d %d", asz_mon[pt_tm->tm_mon], pt_tm->tm_mday, pt_tm->tm_hour, pt_tm->tm_min, pt_tm->tm_sec, pt_tm->tm_year+1900);
		::fprintf(fp, "%u %u %u %s\x0a", u_xy_recs, u_hatena, u_string_recs, sz_buf);
 
		// ③ﾃｷｽﾄ
		// ex. This is pen.　③
		//     hello world.　③
		for (unsigned int j = 0; j < u_string_recs; ++j) {
			::fprintf(fp, "%s\x0a", gen_string1(sz_buf, 1 + (RAND() % MAX_LENGTH_TEXT)));
		}
 
		// ④数値
		// ex. x 1 2　④
		for (unsigned int j = 0; j < u_xy_recs; ++j) {
			x_or_y = (RAND() % 2) ? 'x' : 'y';
//			u_num_recs = RAND() % 0x400 + 1;
			u_num_recs = RAND() % 0x100 + 1;
			::fprintf(fp, "%c %u %u\x0a", x_or_y, j + 1, u_num_recs);
			if (RAND() % 2) {
				// ⑤QQ 謎の行
				// QQ subname -1 0 0 1 -21000000 600000 2
				::fprintf(fp, "QQ %s %d %d %d %d %d %d %d\x0a",
					gen_string2(sz_buf, 1 + (RAND() % MAX_LENGTH_SECTION)),
					(int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND());
			}
			if (x_or_y == 'x') {
				for (unsigned int k = 0; k < u_num_recs; ++k) {
					// 100 1 -2000 10
					::fprintf(fp, "%d %d %d %d\x0a",
						(int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND(), (int32_t)RAND());
				}
			} else {
				for (unsigned int k = 0; k < u_num_recs; ++k) {
					// -100 10000
					::fprintf(fp, "%d %d\x0a",
						(int32_t)RAND(), (int32_t)RAND());
				}
			}
		}
 
		u_pos = ftello(fp);
 
		if (u_pos > GIGA * (uint64_t)u_GiB) {
			break;
		}
	}
 
	return 0;
}
 
int main(int argc, char** argv) {
 
	if (argc != 3) {
		::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", argv[0]);
		return 1;
	}
 
	char* filename = argv[1];
	size_t u_GiB = ::strtoul(argv[2], NULL, 10);;
 
	if (u_GiB == 0) {
		::fprintf(stderr, "Usage: %s <filepath> <GiB size>\n", argv[0]);
		::fprintf(stderr, "<GiB size> must be greater than zero\n");
		return 1;
	}
 
	FILE* fp = ::fopen(filename, "w");
 
	if (::gen_data(fp, u_GiB) < 0) {fclose(fp); return -1;}
	fclose(fp);
	return 0;
}
 

prog.c:12:43: error: unknown type name ‘size_t’
 static char* gen_string1(char* sz_string, size_t u_length) {
                                           ^~~~~~
prog.c:25:43: error: unknown type name ‘size_t’
 static char* gen_string2(char* sz_string, size_t u_length) {
                                           ^~~~~~
prog.c:44:14: error: unknown type name ‘FILE’
 int gen_data(FILE* fp, size_t u_GiB) {
              ^~~~
prog.c:44:24: error: unknown type name ‘size_t’
 int gen_data(FILE* fp, size_t u_GiB) {
                        ^~~~~~
prog.c: In function ‘main’:
prog.c:122:3: error: expected expression before ‘:’ token
   ::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", argv[0]);
   ^
prog.c:127:2: error: unknown type name ‘size_t’
  size_t u_GiB = ::strtoul(argv[2], NULL, 10);;
  ^~~~~~
prog.c:127:17: error: expected expression before ‘:’ token
  size_t u_GiB = ::strtoul(argv[2], NULL, 10);;
                 ^
prog.c:130:3: error: expected expression before ‘:’ token
   ::fprintf(stderr, "Usage: %s <filepath> <GiB size>\n", argv[0]);
   ^
prog.c:131:3: error: expected expression before ‘:’ token
   ::fprintf(stderr, "<GiB size> must be greater than zero\n");
   ^
prog.c:135:2: error: unknown type name ‘FILE’
  FILE* fp = ::fopen(filename, "w");
  ^~~~
prog.c:135:13: error: expected expression before ‘:’ token
  FILE* fp = ::fopen(filename, "w");
             ^
prog.c:137:6: error: expected expression before ‘:’ token
  if (::gen_data(fp, u_GiB) < 0) {fclose(fp); return -1;}
      ^
prog.c:137:34: warning: implicit declaration of function ‘fclose’ [-Wimplicit-function-declaration]
  if (::gen_data(fp, u_GiB) < 0) {fclose(fp); return -1;}
                                  ^~~~~~
prog.c:126:8: warning: unused variable ‘filename’ [-Wunused-variable]
  char* filename = argv[1];
        ^~~~~~~~
At top level:
prog.c:8:20: warning: ‘asz_mon’ defined but not used [-Wunused-variable]
 static char const* asz_mon[12] = {
                    ^~~~~~~

Standard output is empty