Implement platform independent `run_executable`

This should make diagnostics work on other platforms besides Windows.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/common/util.odin b/src/common/util.odin
index 6e31563..b28154e 100644
--- a/src/common/util.odin
+++ b/src/common/util.odin
@@ -4,6 +4,9 @@ import "core:fmt"
 import "core:os"
 import "core:strings"
 import "core:path/filepath"
+foreign import libc "system:c"
+import "core:mem"
+import "core:bytes"
 
 when ODIN_OS == .Windows {
 	delimiter :: ";"
@@ -35,3 +38,35 @@ lookup_in_path :: proc(name: string) -> (string, bool) {
 
 	return "", false
 }
+
+run_executable :: proc(command: string, stdout: ^[]byte) -> (u32, bool, []byte) {
+	fp := popen(strings.clone_to_cstring(command, context.temp_allocator), "r")
+	if fp == nil {
+		return 0, false, stdout[0:]
+	}
+	defer pclose(fp)
+
+	read_buffer: [50]byte
+	index: int
+
+	for fgets(&read_buffer[0], size_of(read_buffer), fp) != nil {
+		read := bytes.index_byte(read_buffer[:], 0)
+		defer index += cast(int)read
+
+		if read > 0 && index + cast(int)read <= len(stdout) {
+			mem.copy(&stdout[index], &read_buffer[0], cast(int)read)
+		}
+	}
+
+	return 0, true, stdout[0:index]
+}
+
+foreign libc 
+{
+	popen :: proc(command: cstring, type: cstring) -> ^FILE ---
+	pclose :: proc(stream: ^FILE) -> i32 ---
+	fgets :: proc "cdecl" (s: [^]byte, n: i32, stream: ^FILE) -> [^]u8 ---
+	fgetc :: proc "cdecl" (stream: ^FILE) -> i32 ---
+}
+
+FILE :: struct {}