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convert c pointers to optional unknown length ptrs

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Luna 2019-08-11 11:12:21 -03:00
parent ca7a655ebb
commit 6b78bb16d8
1 changed files with 19 additions and 23 deletions
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42
src/journal/journal.zig
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@ -12,17 +12,12 @@ const c = @cImport({
const warn = std.debug.warn;
const allocator = std.heap.c_allocator;
fn alloc_str(size: c_ulong) [*c]u8 {
return @ptrCast([*c]u8, @alignCast(@alignOf(u8), c.malloc(c_ulong(size))));
fn sliceify(ptr: [*]u8) []u8 {
return ptr[0..c.strlen(ptr)];
}
fn free_str(ptr: [*c]u8) void {
c.free(@ptrCast(?*c_void, ptr));
}
export fn journal_open(topic_opt: [*c]u8) os.fd_t {
const topic_len = c.strlen(topic_opt);
const topic: []u8 = topic_opt[0..topic_len];
export fn journal_open(topic_cptr: ?[*]u8) os.fd_t {
const topic = sliceify(topic_cptr.?);
const journal_dir = std.fs.path.resolve(allocator, [_][]const u8{
std.os.getenvC(c"HOME").?,
@ -61,10 +56,11 @@ export fn journal_open(topic_opt: [*c]u8) os.fd_t {
return fd;
}
export fn journal_write(journal: os.fd_t, message: [*c]u8) void {
const msglen = c.strlen(message);
std.os.write(journal, message[0..msglen]) catch |err| {
export fn journal_write(journal: os.fd_t, message_cptr: ?[*]u8) void {
std.os.write(
journal,
sliceify(message_cptr.?),
) catch |err| {
std.debug.warn("Error while writing to file: {}\n", err);
return;
};
@ -76,24 +72,25 @@ export fn journal_close(journal: os.fd_t) void {
export fn journal_write_topic(
journal: os.fd_t,
topic_opt: [*c]u8,
message_opt: [*c]u8,
topic_cptr: ?[*]u8,
message_cptr: ?[*]u8,
) void {
var topic = topic_opt[0..c.strlen(topic_opt)];
var message = message_opt[0..c.strlen(message_opt)];
var topic = sliceify(topic_cptr.?);
var message = sliceify(message_cptr.?);
var tstamp_total = allocator.alloc(u8, 128);
defer allocator.free(tstamp_total);
var tstamp_cstr: [*c]u8 = alloc_str(128);
var rawtime: c.time_t = undefined;
_ = c.time(&rawtime);
var cur_time: [*c]const c.struct_tm = c.gmtime(&rawtime);
_ = c.strftime(tstamp_cstr, usize(128), c"%c", cur_time);
_ = c.strftime(tstamp_cstr.ptr, usize(128), c"%c", cur_time);
var tstamp = tstamp_cstr[0..c.strlen(tstamp_cstr)];
var tstamp = sliceify(tstamp_total);
std.debug.warn("tstamp: {}\ntopic: {}\nmsg: {}\n", tstamp, topic, message);
// catch unreachable is intended.
var fmt_msg = std.fmt.allocPrint(
allocator,
"[{}] [{}]: {}\n",
@ -105,12 +102,11 @@ export fn journal_write_topic(
return;
};
// catch unreachable is intended.
var fmt_msg_cstr = std.cstr.addNullByte(
allocator,
fmt_msg,
) catch unreachable;
free_str(tstamp_cstr);
journal_write(journal, fmt_msg_cstr.ptr);
}