158 lines
2.9 KiB
V
158 lines
2.9 KiB
V
module builtin
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[unsafe]
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pub fn memcpy(dest &C.void, src &C.void, n size_t) &C.void {
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dest_ := unsafe { &byte(dest) }
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src_ := unsafe { &byte(src) }
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unsafe {
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for i in 0 .. int(n) {
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dest_[i] = src_[i]
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}
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}
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return unsafe { dest }
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}
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[export: 'malloc']
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[unsafe]
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fn __malloc(n size_t) &C.void {
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return unsafe { malloc(int(n)) }
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}
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[unsafe]
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fn strlen(_s &C.void) size_t {
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s := unsafe { &byte(_s) }
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mut i := 0
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for ; unsafe { s[i] } != 0; i++ {}
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return size_t(i)
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}
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[unsafe]
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fn realloc(old_area &C.void, new_size size_t) &C.void {
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if old_area == 0 {
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return unsafe { malloc(int(new_size)) }
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}
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if new_size == size_t(0) {
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unsafe { free(old_area) }
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return 0
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}
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old_size := unsafe { *(&u64(old_area - sizeof(u64))) }
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if u64(new_size) <= old_size {
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return unsafe { old_area }
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} else {
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new_area := unsafe { malloc(int(new_size)) }
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unsafe { memmove(new_area, old_area, size_t(old_size)) }
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unsafe { free(old_area) }
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return new_area
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}
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}
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[unsafe]
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fn memset(s &C.void, c int, n size_t) &C.void {
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mut s_ := unsafe { &char(s) }
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for i in 0 .. int(n) {
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unsafe {
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s_[i] = char(c)
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}
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}
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return unsafe { s }
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}
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[unsafe]
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fn memmove(dest &C.void, src &C.void, n size_t) &C.void {
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dest_ := unsafe { &byte(dest) }
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src_ := unsafe { &byte(src) }
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mut temp_buf := unsafe { malloc(int(n)) }
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for i in 0 .. int(n) {
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unsafe {
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temp_buf[i] = src_[i]
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}
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}
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for i in 0 .. int(n) {
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unsafe {
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dest_[i] = temp_buf[i]
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}
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}
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unsafe { free(temp_buf) }
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return unsafe { dest }
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}
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[export: 'calloc']
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[unsafe]
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fn __calloc(nmemb size_t, size size_t) &C.void {
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new_area := unsafe { malloc(int(nmemb) * int(size)) }
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unsafe { memset(new_area, 0, nmemb * size) }
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return new_area
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}
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fn getchar() int {
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x := byte(0)
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sys_read(0, &x, 1)
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return int(x)
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}
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fn memcmp(a &C.void, b &C.void, n size_t) int {
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a_ := unsafe { &byte(a) }
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b_ := unsafe { &byte(b) }
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for i in 0 .. int(n) {
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if unsafe { a_[i] != b_[i] } {
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unsafe {
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return a_[i] - b_[i]
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}
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}
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}
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return 0
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}
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[export: 'free']
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[unsafe]
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fn __free(ptr &C.void) {
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err := mm_free(ptr)
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if err != .enoerror {
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eprintln('free error:')
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panic(err)
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}
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}
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fn vsprintf(str &char, format &char, ap &byte) int {
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panic('vsprintf(): string interpolation is not supported in `-freestanding`')
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}
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fn vsnprintf(str &char, size size_t, format &char, ap &byte) int {
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panic('vsnprintf(): string interpolation is not supported in `-freestanding`')
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}
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// not really needed
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fn bare_read(buf &byte, count u64) (i64, Errno) {
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return sys_read(0, buf, count)
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}
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fn bare_print(buf &byte, len u64) {
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sys_write(1, buf, len)
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}
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fn bare_eprint(buf &byte, len u64) {
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sys_write(2, buf, len)
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}
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pub fn write(fd i64, buf &byte, count u64) i64 {
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x, _ := sys_write(fd, buf, count)
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return x
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}
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[noreturn]
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fn bare_panic(msg string) {
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println('V panic' + msg)
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exit(1)
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}
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fn bare_backtrace() string {
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return 'backtraces are not available with `-freestanding`'
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}
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[export: 'exit']
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[noreturn]
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fn __exit(code int) {
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sys_exit(code)
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}
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