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| author | Ayke van Laethem <[email protected]> | 2024-01-27 12:43:45 +0100 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2024-08-10 23:46:58 -0700 |
| commit | 2eb39785fe9d0188e444fd1eb29f1ce2c7a89419 (patch) | |
| tree | d44479528d48558526a788d0d519b37f5735837e /testdata | |
| parent | 3021e16bbf138ef48d840604e330049def61329a (diff) | |
| download | tinygo-2eb39785fe9d0188e444fd1eb29f1ce2c7a89419.tar.gz tinygo-2eb39785fe9d0188e444fd1eb29f1ce2c7a89419.zip | |
cgo: add support for printf
The C printf function is sometimes needed for C files included using
CGo. This commit makes sure they're available on all systems where CGo
is fully supported (that is, everywhere except on AVR).
For baremetal systems using picolibc, I've picked the integer-only
version of printf to save on flash size. We might want to consider
providing a way to pick the floating point version instead, if needed.
Diffstat (limited to 'testdata')
| -rw-r--r-- | testdata/cgo/main.c | 5 | ||||
| -rw-r--r-- | testdata/cgo/main.go | 4 | ||||
| -rw-r--r-- | testdata/cgo/main.h | 2 | ||||
| -rw-r--r-- | testdata/cgo/out.txt | 1 |
4 files changed, 12 insertions, 0 deletions
diff --git a/testdata/cgo/main.c b/testdata/cgo/main.c index 7fb702ed6..4a5bd6b9c 100644 --- a/testdata/cgo/main.c +++ b/testdata/cgo/main.c @@ -1,5 +1,6 @@ #include <math.h> #include "main.h" +#include <stdio.h> int global = 3; bool globalBool = 1; @@ -72,3 +73,7 @@ void arraydecay(int buf1[5], int buf2[3][8], int buf3[4][7][2]) { double doSqrt(double x) { return sqrt(x); } + +void printf_single_int(char *format, int arg) { + printf(format, arg); +} diff --git a/testdata/cgo/main.go b/testdata/cgo/main.go index fa3380bce..ddd1992e2 100644 --- a/testdata/cgo/main.go +++ b/testdata/cgo/main.go @@ -179,6 +179,10 @@ func main() { // libc: test basic stdio functionality putsBuf := []byte("line written using C puts\x00") C.puts((*C.char)(unsafe.Pointer(&putsBuf[0]))) + + // libc: test whether printf works in C. + printfBuf := []byte("line written using C printf with value=%d\n\x00") + C.printf_single_int((*C.char)(unsafe.Pointer(&printfBuf[0])), -21) } func printUnion(union C.joined_t) C.joined_t { diff --git a/testdata/cgo/main.h b/testdata/cgo/main.h index f5405ade6..e7c64ffc3 100644 --- a/testdata/cgo/main.h +++ b/testdata/cgo/main.h @@ -152,3 +152,5 @@ typedef int arraydecay_buf3[4][7][2]; void arraydecay(int buf1[5], int buf2[3][8], arraydecay_buf3 buf3); double doSqrt(double); + +void printf_single_int(char *format, int arg); diff --git a/testdata/cgo/out.txt b/testdata/cgo/out.txt index ae92c87a7..4ea45d864 100644 --- a/testdata/cgo/out.txt +++ b/testdata/cgo/out.txt @@ -77,3 +77,4 @@ copied string: foobar CGo sqrt(3): +1.732051e+000 C sqrt(3): +1.732051e+000 line written using C puts +line written using C printf with value=-21 |