diff options
Diffstat (limited to '05/util.b')
| -rw-r--r-- | 05/util.b | 52 |
1 files changed, 50 insertions, 2 deletions
@@ -139,12 +139,48 @@ function die fputs(2, message) exit(1) +function ftruncate + argument fd + argument length + local x + x = syscall(77, fd, length) + if x != 0 goto ftruncate_failed + return + +:ftruncate_failed + fputs(2, .str_ftruncate_failed) + exit(1) +:str_ftruncate_failed + string ftruncated failed. + byte 10 + byte 0 + +function mmap + argument addr + argument length + argument prot + argument flags + argument fd + argument offset + return syscall(9, addr, length, prot, flags, fd, offset) + +function munmap + argument addr + argument length + return syscall(11, addr, length) + +#define PROT_READ 1 +#define PROT_WRITE 2 +#define PROT_READ_WRITE 3 +#define MAP_SHARED 0x01 +#define MAP_PRIVATE_ANONYMOUS 0x22 + function malloc argument size local total_size local memory total_size = size + 8 - memory = syscall(9, 0, total_size, 3, 0x22, -1, 0) + memory = mmap(0, total_size, PROT_READ_WRITE, MAP_PRIVATE_ANONYMOUS, -1, 0) if memory ] 0xffffffffffff0000 goto malloc_failed *8memory = total_size return memory + 8 @@ -164,7 +200,7 @@ function free local size psize = memory - 8 size = *8psize - syscall(11, psize, size) + munmap(psize, size) return ; returns a pointer to a null-terminated string containing the @@ -568,6 +604,18 @@ function open_w :open_w_error file_error(filename) return -1 + +; open the given file for reading and writing with the given mode +function open_rw + argument filename + argument mode + local fd + fd = syscall(2, filename, 0x242, mode) + if fd < 0 goto open_rw_error + return fd + :open_rw_error + file_error(filename) + return -1 function close argument fd |