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std: clean up sentinel handling for argv/environ

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This commit is contained in:
Isaac Freund 2020-12-27 13:00:35 +01:00
parent 4d1096976a
commit 8000262e07
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2 changed files with 13 additions and 30 deletions
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30
lib/std/child_process.zig
View File

@ -390,15 +390,8 @@ pub const ChildProcess = struct {
// can fail between fork() and execve().
// Therefore, we do all the allocation for the execve() before the fork().
// This means we must do the null-termination of argv and env vars here.
const argv_buf = try arena.alloc(?[*:0]u8, self.argv.len + 1);
for (self.argv) |arg, i| {
const arg_buf = try arena.alloc(u8, arg.len + 1);
@memcpy(arg_buf.ptr, arg.ptr, arg.len);
arg_buf[arg.len] = 0;
argv_buf[i] = arg_buf[0..arg.len :0].ptr;
}
argv_buf[self.argv.len] = null;
const argv_ptr = argv_buf[0..self.argv.len :null].ptr;
const argv_buf = try arena.allocSentinel(?[*:0]u8, self.argv.len, null);
for (self.argv) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
const envp = m: {
if (self.env_map) |env_map| {
@ -465,8 +458,8 @@ pub const ChildProcess = struct {
}
const err = switch (self.expand_arg0) {
.expand => os.execvpeZ_expandArg0(.expand, argv_buf.ptr[0].?, argv_ptr, envp),
.no_expand => os.execvpeZ_expandArg0(.no_expand, argv_buf.ptr[0].?, argv_ptr, envp),
.expand => os.execvpeZ_expandArg0(.expand, argv_buf.ptr[0].?, argv_buf.ptr, envp),
.no_expand => os.execvpeZ_expandArg0(.no_expand, argv_buf.ptr[0].?, argv_buf.ptr, envp),
};
forkChildErrReport(err_pipe[1], err);
}
@ -913,23 +906,20 @@ pub fn createWindowsEnvBlock(allocator: *mem.Allocator, env_map: *const BufMap)
pub fn createNullDelimitedEnvMap(arena: *mem.Allocator, env_map: *const std.BufMap) ![:null]?[*:0]u8 {
const envp_count = env_map.count();
const envp_buf = try arena.alloc(?[*:0]u8, envp_count + 1);
mem.set(?[*:0]u8, envp_buf, null);
const envp_buf = try arena.allocSentinel(?[*:0]u8, envp_count, null);
{
var it = env_map.iterator();
var i: usize = 0;
while (it.next()) |pair| : (i += 1) {
const env_buf = try arena.alloc(u8, pair.key.len + pair.value.len + 2);
@memcpy(env_buf.ptr, pair.key.ptr, pair.key.len);
const env_buf = try arena.allocSentinel(u8, pair.key.len + pair.value.len + 1, 0);
mem.copy(u8, env_buf, pair.key);
env_buf[pair.key.len] = '=';
@memcpy(env_buf.ptr + pair.key.len + 1, pair.value.ptr, pair.value.len);
const len = env_buf.len - 1;
env_buf[len] = 0;
envp_buf[i] = env_buf[0..len :0].ptr;
mem.copy(u8, env_buf[pair.key.len + 1 ..], pair.value);
envp_buf[i] = env_buf.ptr;
}
assert(i == envp_count);
}
return envp_buf[0..envp_count :null];
return envp_buf;
}
test "createNullDelimitedEnvMap" {

13
lib/std/process.zig
View File

@ -816,15 +816,8 @@ pub fn execve(
defer arena_allocator.deinit();
const arena = &arena_allocator.allocator;
const argv_buf = try arena.alloc(?[*:0]u8, argv.len + 1);
for (argv) |arg, i| {
const arg_buf = try arena.alloc(u8, arg.len + 1);
@memcpy(arg_buf.ptr, arg.ptr, arg.len);
arg_buf[arg.len] = 0;
argv_buf[i] = arg_buf[0..arg.len :0].ptr;
}
argv_buf[argv.len] = null;
const argv_ptr = argv_buf[0..argv.len :null].ptr;
const argv_buf = try arena.allocSentinel(?[*:0]u8, argv.len, null);
for (argv) |arg, i| argv_buf[i] = (try arena.dupeZ(u8, arg)).ptr;
const envp = m: {
if (env_map) |m| {
@ -842,5 +835,5 @@ pub fn execve(
}
};
return os.execvpeZ_expandArg0(.no_expand, argv_buf.ptr[0].?, argv_ptr, envp);
return os.execvpeZ_expandArg0(.no_expand, argv_buf.ptr[0].?, argv_buf.ptr, envp);
}