On Sun, Aug 5, 2018 at 12:29 PM nicolas_boiteux via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> it returns :
>
> .\armago_x64.go:19: cannot convert p (type **_Ctype_char) to type uintptr
Ok, this time bit more tested
jnml@4670:~/tmp> cat main.c
#include <stdio.h>
int main(int argc, char **argv) {
char **p;
for (p = argv; *p != 0; p++) {
printf("%s\n", *p);
}
}
jnml@4670:~/tmp> ccgo main.c && ./a.out abc def ghi
./a.out
abc
def
ghi
jnml@4670:~/tmp> ccgo -o main.go main.c
jnml@4670:~/tmp> cat main.go
// Code generated by 'ccgo -o main.go main.c', DO NOT EDIT.
// +build linux,amd64
package main
import (
"math"
"os"
"unsafe"
"github.com/cznic/crt"
)
const (
null = uintptr(0)
)
var (
_ = math.Pi
_ = os.DevNull
_ = unsafe.Pointer(null)
nz32 float32
nz64 float64
)
func init() { nz32 = -nz32 }
func init() { nz64 = -nz64 }
func alloca(p *[]uintptr, n int) uintptr { r := crt.MustMalloc(n); *p =
append(*p, r); return r }
func preinc(p *uintptr, n uintptr) uintptr { *p += n; return *p }
func main() {
psz := unsafe.Sizeof(uintptr(0))
argv := crt.MustCalloc((len(os.Args) + 1) * int(psz))
p := argv
for _, v := range os.Args {
*(*uintptr)(unsafe.Pointer(p)) = crt.CString(v)
p += psz
}
a := os.Environ()
env := crt.MustCalloc((len(a) + 1) * int(psz))
p = env
for _, v := range a {
*(*uintptr)(unsafe.Pointer(p)) = crt.CString(v)
p += psz
}
*(*uintptr)(unsafe.Pointer(Xenviron)) = env
X_start(crt.NewTLS(), int32(len(os.Args)), argv)
}
// linking main.o
// X__ccgo_va_end *void, escapes: true, builtin.h:36:6
var X__ccgo_va_end = bss + 0
// X__ccgo_va_start *void, escapes: true, builtin.h:37:6
var X__ccgo_va_start = bss + 8
// Xmain is defined at main.c:3:5
func Xmain(tls crt.TLS, _argc int32, _argv uintptr /* **int8 */) (r int32) {
var _p uintptr // **int8
_p = _argv
_1:
if (*(*uintptr)(unsafe.Pointer(_p))) == 0 {
goto _3
}
crt.Xprintf(tls, ts+0 /* "%s\n" */, *(*uintptr)(unsafe.Pointer(_p)))
_p += 8
goto _1
_3:
return r
}
// linking crt0.o
// X__stdfiles [3]uintptr, escapes: true, crt0.c:3:15
var X__stdfiles = bss + 16
// Xenviron **int8, escapes: true, crt0.c:4:6
var Xenviron = bss + 40
// Xstdin *void, escapes: true, crt0.c:5:6
var Xstdin = bss + 48 // pointer to void
func init() { *(*uintptr)(unsafe.Pointer(Xstdin)) = X__stdfiles }
// Xstdout *void, escapes: true, crt0.c:5:31
var Xstdout = bss + 56 // pointer to void
func init() { *(*uintptr)(unsafe.Pointer(Xstdout)) = X__stdfiles + 8 }
// Xstderr *void, escapes: true, crt0.c:5:57
var Xstderr = bss + 64 // pointer to void
func init() { *(*uintptr)(unsafe.Pointer(Xstderr)) = X__stdfiles + 16 }
// X_start is defined at crt0.c:7:6
func X_start(tls crt.TLS, _argc int32, _argv uintptr /* **int8 */) {
crt.X__register_stdfiles(tls, *(*uintptr)(unsafe.Pointer(Xstdin)),
*(*uintptr)(unsafe.Pointer(Xstdout)), *(*uintptr)(unsafe.Pointer(Xstderr)),
Xenviron)
crt.X__builtin_exit(tls, Xmain(tls, _argc, _argv))
}
func init() { *(*uintptr)(unsafe.Pointer(Xstdin)) = X__stdfiles }
func init() { *(*uintptr)(unsafe.Pointer(Xstdout)) = X__stdfiles + 8 }
func init() { *(*uintptr)(unsafe.Pointer(Xstderr)) = X__stdfiles + 16 }
var (
bss = crt.BSS(&bssInit[0])
bssInit [72]byte
ts = crt.TS("%s\n\x00")
)
jnml@4670:~/tmp>
I hope you can extract the code for your case from the above mechanically
produced Go code. Note that ccgo uses untrptrs instead of normal pointers
but that should be an easy adjustment, I hope.
--
-j
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