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use zig to read a file

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This commit is contained in:
Folkert 2020-12-12 01:44:04 +01:00
parent 462f6ac8e5
commit bdd53c81b3
1 changed files with 61 additions and 15 deletions
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76
examples/task/platform/host.zig
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@ -1,6 +1,12 @@
const std = @import("std"); const std = @import("std");
const str = @import("../../../compiler/builtins/bitcode/src/str.zig"); const str = @import("str.zig");
const RocStr = str.RocStr;
const testing = std.testing; const testing = std.testing;
const expectEqual = testing.expectEqual;
const expect = testing.expect;
const mem = std.mem;
const Allocator = mem.Allocator;
extern fn roc__mainForHost_1_exposed([*]u8) void; extern fn roc__mainForHost_1_exposed([*]u8) void;
extern fn roc__mainForHost_1_size() i64; extern fn roc__mainForHost_1_size() i64;
@ -59,26 +65,46 @@ fn call_the_closure(function_pointer: *const u8, closure_data_pointer: [*]u8) vo
} }
} }
extern var errno: c_int; pub export fn roc_fx_putLine(rocPath: str.RocStr) i64 {
const stdout = std.io.getStdOut().writer();
const FILE = extern struct { const u8_ptr = rocPath.asU8ptr();
unused: u8,
};
extern fn fopen([*c]const u8, [*c]const u8) ?[*c]FILE; var i: usize = 0;
extern fn ftell([*c]FILE) c_long; while (i < rocPath.len()) {
extern fn fread([*c]u8, size_t, size_t, [*c]FILE) size_t; stdout.print("{c}", .{u8_ptr[i]}) catch unreachable;
extern fn fclose([*c]FILE) c_int;
i += 1;
}
stdout.print("\n", .{}) catch unreachable;
return 0;
}
pub const ReadResult = extern struct { pub const ReadResult = extern struct {
bytes: RocStr, // TODO RocList<u8> once Roc supports U8 bytes: RocStr, // TODO RocList<u8> once Roc supports U8
errno: i64, // TODO i32 when Roc supports I32 errno: i64, // TODO i32 when Roc supports I32
}; };
pub fn roc_fx_readAllUtf8(rocPath: *RocStr) ReadResult { pub export fn roc_fx_readAllUtf8(rocPath: RocStr) callconv(.C) ReadResult {
var dir = std.fs.cwd();
var content = dir.readFileAlloc(testing.allocator, rocPath.asSlice(), 1024) catch unreachable;
var str_ptr = @ptrCast([*]u8, content);
var roc_str3 = RocStr.init(testing.allocator, str_ptr, content.len);
return ReadResult{ .bytes = roc_str3, .errno = 0 };
}
pub fn roc_fx_readAllUtf8_that_does_not_work(rocPath: *RocStr) ReadResult {
const allocator = std.heap.c_allocator;
// fopen wants a C string, so stack-allocate one using rocPath's contents // fopen wants a C string, so stack-allocate one using rocPath's contents
const len = rocPath.len(); const len = rocPath.len() + 1;
var path: [len + 1]u8 = undefined;
var raw = allocator.alloc(u8, len) catch unreachable;
var path: [*:0]u8 = @ptrCast([*:0]u8, raw);
rocPath.memcpy(path, len); rocPath.memcpy(path, len);
path[len] = 0; // nul-terminate the path, since it's a C string path[len] = 0; // nul-terminate the path, since it's a C string
@ -163,6 +189,26 @@ pub fn roc_fx_readAllUtf8(rocPath: *RocStr) ReadResult {
return ReadResult{ .bytes = RocStr.init(buffer, totalBytes), .errno = 0 }; return ReadResult{ .bytes = RocStr.init(buffer, totalBytes), .errno = 0 };
} }
test "read empty file" { // const c = @cImport({
std.debug.panic("hello!", .{}); // @cInclude("stdio.h");
} // @cInclude("stdlib.h");
// });
//
// extern var errno: c_int;
//
// const FILE = extern struct {
// unused: u8,
// };
// extern "c" fn fopen(filename: [*:0]const u8, modes: [*:0]const u8) ?*FILE;
//extern "c" fn fopen(filename: [*:0]const u8, modes: [*:0]const u8) ?*FILE;
//extern "c" fn fclose(stream: *FILE) c_int;
//extern "c" fn fseek(stream: *FILE, offset: c_long, origin: c_int) c_int;
// extern fn fopen([*:0]const u8, [*:0]const u8) ?*FILE;
// extern fn fseek(*FILE, c_long, c_int) c_int;
//extern fn fopen([*c]const u8, [*c]const u8) [*c]FILE;
// extern fn ftell([*c]FILE) c_long;
// extern fn fread([*c]u8, size_t, size_t, [*c]FILE) size_t;
// extern fn fclose([*c]FILE) c_int;