def _Read(self, lex_mode):
# type: (lex_mode_t) -> Token
"""Read from the normal line buffer, not an alias."""
t = self.line_lexer.Read(lex_mode)
if t.id == Id.Eol_Tok: # hit \0, read a new line
line_id, line, line_pos = self.line_reader.GetLine()
if line is None: # no more lines
span_id = self.line_lexer.GetSpanIdForEof()
if self.emit_comp_dummy:
id_ = Id.Lit_CompDummy
self.emit_comp_dummy = False # emit EOF the next time
else:
id_ = Id.Eof_Real
t = Token(id_, span_id, '')
return t
self.line_lexer.Reset(line, line_id,
line_pos) # fill with a new line
t = self.line_lexer.Read(lex_mode)
# e.g. translate ) or ` into EOF
if len(self.translation_stack):
old_id, new_id = self.translation_stack[-1] # top
if t.id == old_id:
#print('==> TRANSLATING %s ==> %s' % (t, new_s))
self.translation_stack.pop()
t.id = new_id
return t
def Run(self, cmd_val):
# type: (cmd_value__Argv) -> int
argv = cmd_val.argv[1:]
attrs, arg_r = flag_spec.ParseLikeEcho('echo', cmd_val)
arg = arg_types.echo(attrs.attrs)
argv = arg_r.Rest()
backslash_c = False # \c terminates input
arg0_spid = cmd_val.arg_spids[0]
if arg.e:
new_argv = [] # type: List[str]
for a in argv:
parts = [] # type: List[str]
lex = match.EchoLexer(a)
while not backslash_c:
id_, value = lex.Next()
if id_ == Id.Eol_Tok: # Note: This is really a NUL terminator
break
tok = Token(id_, arg0_spid, value)
p = word_compile.EvalCStringToken(tok)
# Unusual behavior: '\c' prints what is there and aborts processing!
if p is None:
backslash_c = True
break
parts.append(p)
new_argv.append(''.join(parts))
if backslash_c: # no more args either
break
# Replace it
argv = new_argv
if self.exec_opts.simple_echo():
n = len(argv)
if n == 0:
pass
elif n == 1:
self.f.write(argv[0])
else:
# TODO: span_id could be more accurate
e_usage(
"takes at most one arg when simple_echo is on (hint: add quotes)"
)
else:
#log('echo argv %s', argv)
for i, a in enumerate(argv):
if i != 0:
self.f.write(' ') # arg separator
self.f.write(a)
if not arg.n and not backslash_c:
self.f.write('\n')
return 0
def RunCommandSub(self, node):
# type: (command_t) -> str
# Hack for weird $(<file) construct
if node.tag_() == command_e.Simple:
simple = cast(command__Simple, node)
# Detect '< file'
if (len(simple.words) == 0 and len(simple.redirects) == 1
and simple.redirects[0].op.id == Id.Redir_Less):
# change it to __cat < file
# note: cmd_eval.py _Dispatch works around lack of spid
tok = Token(Id.Lit_Chars, runtime.NO_SPID, '__cat')
cat_word = compound_word([tok])
# MUTATE the command.Simple node. This will only be done the first
# time in the parent process.
simple.words.append(cat_word)
p = self._MakeProcess(node,
inherit_errexit=self.exec_opts.inherit_errexit())
r, w = posix.pipe()
p.AddStateChange(process.StdoutToPipe(r, w))
_ = p.Start()
#log('Command sub started %d', pid)
chunks = [] # type: List[str]
posix.close(w) # not going to write
while True:
byte_str = posix.read(r, 4096)
if len(byte_str) == 0:
break
chunks.append(byte_str)
posix.close(r)
status = p.Wait(self.waiter)
# OSH has the concept of aborting in the middle of a WORD. We're not
# waiting until the command is over!
if self.exec_opts.more_errexit():
if self.exec_opts.errexit() and status != 0:
raise error.ErrExit('Command sub exited with status %d (%r)',
status, NewStr(command_str(node.tag_())))
else:
# Set a flag so we check errexit at the same time as bash. Example:
#
# a=$(false)
# echo foo # no matter what comes here, the flag is reset
#
# Set ONLY until this command node has finished executing.
# HACK: move this
self.cmd_ev.check_command_sub_status = True
self.mem.SetLastStatus(status)
# Runtime errors test case: # $("echo foo > $@")
# Why rstrip()?
# https://unix.stackexchange.com/questions/17747/why-does-shell-command-substitution-gobble-up-a-trailing-newline-char
return ''.join(chunks).rstrip('\n')
def _ExpandPart(
parts, # type: List[word_part_t]
first_alt_index, # type: int
suffixes, # type: List[List[word_part_t]]
):
# type: (...) -> List[List[word_part_t]]
"""Mutually recursive with _BraceExpand.
Args:
parts: input parts
first_alt_index: index of the first BracedTuple
suffixes: List of suffixes to append.
"""
out = [] # type: List[List[word_part_t]]
prefix = parts[:first_alt_index]
expand_part = parts[first_alt_index]
UP_part = expand_part
with tagswitch(expand_part) as case:
if case(word_part_e.BracedTuple):
expand_part = cast(word_part__BracedTuple, UP_part)
# Call _BraceExpand on each of the inner words too!
expanded_alts = [] # type: List[List[word_part_t]]
for w in expand_part.words:
expanded_alts.extend(_BraceExpand(w.parts))
for alt_parts in expanded_alts:
for suffix in suffixes:
out_parts = [] # type: List[word_part_t]
out_parts.extend(prefix)
out_parts.extend(alt_parts)
out_parts.extend(suffix)
out.append(out_parts)
elif case(word_part_e.BracedRange):
expand_part = cast(word_part__BracedRange, UP_part)
# Not mutually recursive with _BraceExpand
strs = _RangeStrings(expand_part)
for s in strs:
for suffix in suffixes:
out_parts_ = [] # type: List[word_part_t]
out_parts_.extend(prefix)
# Preserve span_id from the original
t = Token(Id.Lit_Chars, expand_part.spids[0], s)
out_parts_.append(t)
out_parts_.extend(suffix)
out.append(out_parts_)
else:
raise AssertionError()
return out
def Read(self, lex_mode):
# type: (lex_mode_t) -> Token
# Inner loop optimization
line = self.line
line_pos = self.line_pos
tok_type, end_pos = match.OneToken(lex_mode, line, line_pos)
if tok_type == Id.Eol_Tok: # Do NOT add a span for this sentinel!
return _EOL_TOK
# Save on allocations! We often don't look at the token value.
# TODO: can inline this function with formula on 16-bit Id.
kind = consts.GetKind(tok_type)
# Whitelist doesn't work well? Use blacklist for now.
# - Kind.KW is sometimes a literal in a word
# - Kind.Right is for " in here docs. Lexer isn't involved.
# - Got an error with Kind.Left too that I don't understand
# if kind in (Kind.Lit, Kind.VSub, Kind.Redir, Kind.Char, Kind.Backtick, Kind.KW, Kind.Right):
if kind in (Kind.Arith, Kind.Op, Kind.WS, Kind.Ignored, Kind.Eof):
tok_val = None # type: Optional[str]
else:
tok_val = line[line_pos:end_pos]
# NOTE: We're putting the arena hook in LineLexer and not Lexer because we
# want it to be "low level". The only thing fabricated here is a newline
# added at the last line, so we don't end with \0.
if self.arena_skip: # make another token from the last span
assert self.last_span_id != runtime.NO_SPID
span_id = self.last_span_id
self.arena_skip = False
else:
tok_len = end_pos - line_pos
span_id = self.arena.AddLineSpan(self.line_id, line_pos, tok_len)
self.last_span_id = span_id
#log('LineLexer.Read() span ID %d for %s', span_id, tok_type)
t = Token(tok_type, span_id, tok_val)
self.line_pos = end_pos
return t
def Tok(id_, val): return Token(id_, runtime.NO_SPID, val)
from _devbuild.gen.types_asdl import lex_mode_t
from _devbuild.gen.id_kind_asdl import Id_t, Id, Kind
from asdl import runtime
from core.pyerror import log
from mycpp import mylib
from frontend import consts
from frontend import match
from typing import Callable, List, Tuple, Optional, Counter, TYPE_CHECKING
if TYPE_CHECKING:
from core.alloc import Arena
from core import optview
from frontend.reader import _Reader
# Special immutable tokens
_EOL_TOK = Token(Id.Eol_Tok, runtime.NO_SPID, None)
class LineLexer(object):
def __init__(self, line, arena):
# type: (str, Arena) -> None
self.arena = arena
self.arena_skip = False # For MaybeUnreadOne
self.last_span_id = runtime.NO_SPID # For MaybeUnreadOne
self.Reset(line, -1, 0) # Invalid line_id to start
def __repr__(self):
# type: () -> str
return '<LineLexer at pos %d of line %r (id = %d)>' % (
def Run(self, cmd_val):
# type: (cmd_value__Argv) -> int
"""
printf: printf [-v var] format [argument ...]
"""
attrs, arg_r = flag_spec.ParseCmdVal('printf', cmd_val)
arg = arg_types.printf(attrs.attrs)
fmt, fmt_spid = arg_r.ReadRequired2('requires a format string')
varargs, spids = arg_r.Rest2()
#log('fmt %s', fmt)
#log('vals %s', vals)
arena = self.parse_ctx.arena
if fmt in self.parse_cache:
parts = self.parse_cache[fmt]
else:
line_reader = reader.StringLineReader(fmt, arena)
# TODO: Make public
lexer = self.parse_ctx._MakeLexer(line_reader)
parser = _FormatStringParser(lexer)
with alloc.ctx_Location(arena, source.ArgvWord(fmt_spid)):
try:
parts = parser.Parse()
except error.Parse as e:
self.errfmt.PrettyPrintError(e)
return 2 # parse error
self.parse_cache[fmt] = parts
if 0:
print()
for part in parts:
part.PrettyPrint()
print()
out = [] # type: List[str]
arg_index = 0
num_args = len(varargs)
backslash_c = False
while True:
for part in parts:
UP_part = part
if part.tag_() == printf_part_e.Literal:
part = cast(printf_part__Literal, UP_part)
token = part.token
if token.id == Id.Format_EscapedPercent:
s = '%'
else:
s = word_compile.EvalCStringToken(token)
out.append(s)
elif part.tag_() == printf_part_e.Percent:
part = cast(printf_part__Percent, UP_part)
flags = [] # type: List[str]
if len(part.flags) > 0:
for flag_token in part.flags:
flags.append(flag_token.val)
width = -1 # nonexistent
if part.width:
if part.width.id in (Id.Format_Num, Id.Format_Zero):
width_str = part.width.val
width_spid = part.width.span_id
elif part.width.id == Id.Format_Star:
if arg_index < num_args:
width_str = varargs[arg_index]
width_spid = spids[arg_index]
arg_index += 1
else:
width_str = '' # invalid
width_spid = runtime.NO_SPID
else:
raise AssertionError()
try:
width = int(width_str)
except ValueError:
if width_spid == runtime.NO_SPID:
width_spid = part.width.span_id
self.errfmt.Print_("printf got invalid width %r" %
width_str,
span_id=width_spid)
return 1
precision = -1 # nonexistent
if part.precision:
if part.precision.id == Id.Format_Dot:
precision_str = '0'
precision_spid = part.precision.span_id
elif part.precision.id in (Id.Format_Num,
Id.Format_Zero):
precision_str = part.precision.val
precision_spid = part.precision.span_id
elif part.precision.id == Id.Format_Star:
if arg_index < num_args:
precision_str = varargs[arg_index]
precision_spid = spids[arg_index]
arg_index += 1
else:
precision_str = ''
precision_spid = runtime.NO_SPID
else:
raise AssertionError()
try:
precision = int(precision_str)
except ValueError:
if precision_spid == runtime.NO_SPID:
precision_spid = part.precision.span_id
self.errfmt.Print_(
'printf got invalid precision %r' %
precision_str,
span_id=precision_spid)
return 1
#log('index=%d n=%d', arg_index, num_args)
if arg_index < num_args:
s = varargs[arg_index]
word_spid = spids[arg_index]
arg_index += 1
else:
s = ''
word_spid = runtime.NO_SPID
typ = part.type.val
if typ == 's':
if precision >= 0:
s = s[:precision] # truncate
elif typ == 'q':
s = qsn.maybe_shell_encode(s)
elif typ == 'b':
# Process just like echo -e, except \c handling is simpler.
c_parts = [] # type: List[str]
lex = match.EchoLexer(s)
while True:
id_, tok_val = lex.Next()
if id_ == Id.Eol_Tok: # Note: This is really a NUL terminator
break
# TODO: add span_id from argv
tok = Token(id_, runtime.NO_SPID, tok_val)
p = word_compile.EvalCStringToken(tok)
# Unusual behavior: '\c' aborts processing!
if p is None:
backslash_c = True
break
c_parts.append(p)
s = ''.join(c_parts)
elif typ in 'diouxX' or part.type.id == Id.Format_Time:
try:
d = int(s)
except ValueError:
if len(s) >= 1 and s[0] in '\'"':
# TODO: utf-8 decode s[1:] to be more correct. Probably
# depends on issue #366, a utf-8 library.
# Note: len(s) == 1 means there is a NUL (0) after the quote..
d = ord(s[1]) if len(s) >= 2 else 0
elif part.type.id == Id.Format_Time and len(
s) == 0 and word_spid == runtime.NO_SPID:
# Note: No argument means -1 for %(...)T as in Bash Reference
# Manual 4.2 "If no argument is specified, conversion behaves
# as if -1 had been given."
d = -1
else:
if word_spid == runtime.NO_SPID:
# Blame the format string
blame_spid = part.type.span_id
else:
blame_spid = word_spid
self.errfmt.Print_(
'printf expected an integer, got %r' % s,
span_id=blame_spid)
return 1
if typ in 'di':
s = str(d)
elif typ in 'ouxX':
if d < 0:
e_die(
"Can't format negative number %d with %%%s",
d,
typ,
span_id=part.type.span_id)
if typ == 'u':
s = str(d)
elif typ == 'o':
s = mylib.octal(d)
elif typ == 'x':
s = mylib.hex_lower(d)
elif typ == 'X':
s = mylib.hex_upper(d)
elif part.type.id == Id.Format_Time:
# %(...)T
# Initialize timezone:
# `localtime' uses the current timezone information initialized
# by `tzset'. The function `tzset' refers to the environment
# variable `TZ'. When the exported variable `TZ' is present,
# its value should be reflected in the real environment
# variable `TZ' before call of `tzset'.
#
# Note: unlike LANG, TZ doesn't seem to change behavior if it's
# not exported.
#
# TODO: In Oil, provide an API that doesn't rely on libc's
# global state.
tzcell = self.mem.GetCell('TZ')
if tzcell and tzcell.exported and tzcell.val.tag_(
) == value_e.Str:
tzval = cast(value__Str, tzcell.val)
posix.putenv('TZ', tzval.s)
time_.tzset()
# Handle special values:
# User can specify two special values -1 and -2 as in Bash
# Reference Manual 4.2: "Two special argument values may be
# used: -1 represents the current time, and -2 represents the
# time the shell was invoked." from
# https://www.gnu.org/software/bash/manual/html_node/Bash-Builtins.html#index-printf
if d == -1: # the current time
ts = time_.time()
elif d == -2: # the shell start time
ts = self.shell_start_time
else:
ts = d
s = time_.strftime(typ[1:-2], time_.localtime(ts))
if precision >= 0:
s = s[:precision] # truncate
else:
raise AssertionError()
else:
raise AssertionError()
if width >= 0:
if len(flags):
if '-' in flags:
s = s.ljust(width, ' ')
elif '0' in flags:
s = s.rjust(width, '0')
else:
pass
else:
s = s.rjust(width, ' ')
out.append(s)
else:
raise AssertionError()
if backslash_c: # 'printf %b a\cb xx' - \c terminates processing!
break
if arg_index >= num_args:
break
# Otherwise there are more args. So cycle through the loop once more to
# implement the 'arg recycling' behavior.
result = ''.join(out)
if arg.v is not None:
# TODO: get the span_id for arg.v!
v_spid = runtime.NO_SPID
arena = self.parse_ctx.arena
a_parser = self.parse_ctx.MakeArithParser(arg.v)
with alloc.ctx_Location(arena, source.ArgvWord(v_spid)):
try:
anode = a_parser.Parse()
except error.Parse as e:
ui.PrettyPrintError(e, arena) # show parse error
e_usage('Invalid -v expression', span_id=v_spid)
lval = self.arith_ev.EvalArithLhs(anode, v_spid)
if not self.exec_opts.eval_unsafe_arith(
) and lval.tag_() != lvalue_e.Named:
e_usage(
'-v expected a variable name. shopt -s eval_unsafe_arith allows expressions',
span_id=v_spid)
state.SetRef(self.mem, lval, value.Str(result))
else:
mylib.Stdout().write(result)
return 0
def ErrorWord(error_str):
# type: (str) -> compound_word
t = Token(Id.Lit_Chars, runtime.NO_SPID, error_str)
return compound_word([t])
def ErrorWord(fmt, err):
# type: (str, _ErrorWithLocation) -> compound_word
error_str = fmt % err.UserErrorString()
t = Token(Id.Lit_Chars, runtime.NO_SPID, error_str)
return compound_word([t])
def RunCommandSub(self, cs_part):
# type: (command_sub) -> str
if not self.exec_opts.allow_command_sub():
# TODO:
# - Add spid of $(
# - Better hints. Use 'run' for 'if myfunc', and 2 lines like local x;
# x=$(false) fo assignment builtins.
# - Maybe we should have an error message ID that links somewhere?
e_die(
"Command subs not allowed here because status wouldn't be checked (strict_errexit)."
)
node = cs_part.child
# Hack for weird $(<file) construct
if node.tag_() == command_e.Simple:
simple = cast(command__Simple, node)
# Detect '< file'
if (len(simple.words) == 0 and len(simple.redirects) == 1
and simple.redirects[0].op.id == Id.Redir_Less):
# change it to __cat < file
# note: cmd_eval.py _Dispatch works around lack of spid
tok = Token(Id.Lit_Chars, runtime.NO_SPID, '__cat')
cat_word = compound_word([tok])
# MUTATE the command.Simple node. This will only be done the first
# time in the parent process.
simple.words.append(cat_word)
p = self._MakeProcess(node,
inherit_errexit=self.exec_opts.inherit_errexit())
r, w = posix.pipe()
p.AddStateChange(process.StdoutToPipe(r, w))
_ = p.Start()
#log('Command sub started %d', pid)
chunks = [] # type: List[str]
posix.close(w) # not going to write
while True:
byte_str = posix.read(r, 4096)
if len(byte_str) == 0:
break
chunks.append(byte_str)
posix.close(r)
status = p.Wait(self.waiter)
# OSH has the concept of aborting in the middle of a WORD. We're not
# waiting until the command is over!
if self.exec_opts.command_sub_errexit():
if status != 0:
raise error.ErrExit('Command sub exited with status %d (%s)' %
(status, ui.CommandType(node)),
span_id=cs_part.left_token.span_id,
status=status)
else:
# Set a flag so we check errexit at the same time as bash. Example:
#
# a=$(false)
# echo foo # no matter what comes here, the flag is reset
#
# Set ONLY until this command node has finished executing.
# HACK: move this
self.cmd_ev.check_command_sub_status = True
self.mem.SetLastStatus(status)
# Runtime errors test case: # $("echo foo > $@")
# Why rstrip()?
# https://unix.stackexchange.com/questions/17747/why-does-shell-command-substitution-gobble-up-a-trailing-newline-char
return ''.join(chunks).rstrip('\n')
def _Format(self, parts, varargs, spids, out):
# type: (List[printf_part_t], List[str], List[int], List[str]) -> int
"""Hairy printf formatting logic."""
arg_index = 0
num_args = len(varargs)
backslash_c = False
while True: # loop over arguments
for part in parts: # loop over parsed format string
UP_part = part
if part.tag_() == printf_part_e.Literal:
part = cast(printf_part__Literal, UP_part)
token = part.token
if token.id == Id.Format_EscapedPercent:
s = '%'
else:
s = word_compile.EvalCStringToken(token)
out.append(s)
elif part.tag_() == printf_part_e.Percent:
# Note: This case is very long, but hard to refactor because of the
# error cases and "recycling" of args! (arg_index, return 1, etc.)
part = cast(printf_part__Percent, UP_part)
# TODO: These calculations are independent of the data, so could be
# cached
flags = [] # type: List[str]
if len(part.flags) > 0:
for flag_token in part.flags:
flags.append(flag_token.val)
width = -1 # nonexistent
if part.width:
if part.width.id in (Id.Format_Num, Id.Format_Zero):
width_str = part.width.val
width_spid = part.width.span_id
elif part.width.id == Id.Format_Star:
if arg_index < num_args:
width_str = varargs[arg_index]
width_spid = spids[arg_index]
arg_index += 1
else:
width_str = '' # invalid
width_spid = runtime.NO_SPID
else:
raise AssertionError()
try:
width = int(width_str)
except ValueError:
if width_spid == runtime.NO_SPID:
width_spid = part.width.span_id
self.errfmt.Print_("printf got invalid width %r" %
width_str,
span_id=width_spid)
return 1
precision = -1 # nonexistent
if part.precision:
if part.precision.id == Id.Format_Dot:
precision_str = '0'
precision_spid = part.precision.span_id
elif part.precision.id in (Id.Format_Num,
Id.Format_Zero):
precision_str = part.precision.val
precision_spid = part.precision.span_id
elif part.precision.id == Id.Format_Star:
if arg_index < num_args:
precision_str = varargs[arg_index]
precision_spid = spids[arg_index]
arg_index += 1
else:
precision_str = ''
precision_spid = runtime.NO_SPID
else:
raise AssertionError()
try:
precision = int(precision_str)
except ValueError:
if precision_spid == runtime.NO_SPID:
precision_spid = part.precision.span_id
self.errfmt.Print_(
'printf got invalid precision %r' %
precision_str,
span_id=precision_spid)
return 1
if arg_index < num_args:
s = varargs[arg_index]
word_spid = spids[arg_index]
arg_index += 1
has_arg = True
else:
s = ''
word_spid = runtime.NO_SPID
has_arg = False
typ = part.type.val
if typ == 's':
if precision >= 0:
s = s[:precision] # truncate
elif typ == 'q':
# TODO: most shells give \' for single quote, while OSH gives $'\''
# this could matter when SSH'ing
s = qsn.maybe_shell_encode(s)
elif typ == 'b':
# Process just like echo -e, except \c handling is simpler.
c_parts = [] # type: List[str]
lex = match.EchoLexer(s)
while True:
id_, tok_val = lex.Next()
if id_ == Id.Eol_Tok: # Note: This is really a NUL terminator
break
# TODO: add span_id from argv
tok = Token(id_, runtime.NO_SPID, tok_val)
p = word_compile.EvalCStringToken(tok)
# Unusual behavior: '\c' aborts processing!
if p is None:
backslash_c = True
break
c_parts.append(p)
s = ''.join(c_parts)
elif part.type.id == Id.Format_Time or typ in 'diouxX':
# %(...)T and %d share this complex integer conversion logic
try:
d = int(
s
) # note: spaces like ' -42 ' accepted and normalized
except ValueError:
# 'a is interpreted as the ASCII value of 'a'
if len(s) >= 1 and s[0] in '\'"':
# TODO: utf-8 decode s[1:] to be more correct. Probably
# depends on issue #366, a utf-8 library.
# Note: len(s) == 1 means there is a NUL (0) after the quote..
d = ord(s[1]) if len(s) >= 2 else 0
# No argument means -1 for %(...)T as in Bash Reference Manual
# 4.2 "If no argument is specified, conversion behaves as if -1
# had been given."
elif not has_arg and part.type.id == Id.Format_Time:
d = -1
else:
blame_spid = word_spid if has_arg else part.type.span_id
self.errfmt.Print_(
'printf expected an integer, got %r' % s,
span_id=blame_spid)
return 1
if part.type.id == Id.Format_Time:
# Initialize timezone:
# `localtime' uses the current timezone information initialized
# by `tzset'. The function `tzset' refers to the environment
# variable `TZ'. When the exported variable `TZ' is present,
# its value should be reflected in the real environment
# variable `TZ' before call of `tzset'.
#
# Note: unlike LANG, TZ doesn't seem to change behavior if it's
# not exported.
#
# TODO: In Oil, provide an API that doesn't rely on libc's
# global state.
tzcell = self.mem.GetCell('TZ')
if tzcell and tzcell.exported and tzcell.val.tag_(
) == value_e.Str:
tzval = cast(value__Str, tzcell.val)
posix.putenv('TZ', tzval.s)
time_.tzset()
# Handle special values:
# User can specify two special values -1 and -2 as in Bash
# Reference Manual 4.2: "Two special argument values may be
# used: -1 represents the current time, and -2 represents the
# time the shell was invoked." from
# https://www.gnu.org/software/bash/manual/html_node/Bash-Builtins.html#index-printf
if d == -1: # the current time
ts = time_.time()
elif d == -2: # the shell start time
ts = self.shell_start_time
else:
ts = d
s = time_.strftime(typ[1:-2], time_.localtime(ts))
if precision >= 0:
s = s[:precision] # truncate
else: # typ in 'diouxX'
# Disallowed because it depends on 32- or 64- bit
if d < 0 and typ in 'ouxX':
e_die(
"Can't format negative number %d with %%%s",
d,
typ,
span_id=part.type.span_id)
if typ == 'o':
s = mylib.octal(d)
elif typ == 'x':
s = mylib.hex_lower(d)
elif typ == 'X':
s = mylib.hex_upper(d)
else: # diu
s = str(d) # without spaces like ' -42 '
# There are TWO different ways to ZERO PAD, and they differ on
# the negative sign! See spec/builtin-printf
zero_pad = 0 # no zero padding
if width >= 0 and '0' in flags:
zero_pad = 1 # style 1
elif precision > 0 and len(s) < precision:
zero_pad = 2 # style 2
if zero_pad:
negative = (s[0] == '-')
if negative:
digits = s[1:]
sign = '-'
if zero_pad == 1:
# [%06d] -42 becomes [-00042] (6 TOTAL)
n = width - 1
else:
# [%6.6d] -42 becomes [-000042] (1 for '-' + 6)
n = precision
else:
digits = s
sign = ''
if zero_pad == 1:
n = width
else:
n = precision
s = sign + digits.rjust(n, '0')
else:
raise AssertionError()
if width >= 0:
if '-' in flags:
s = s.ljust(width, ' ')
else:
s = s.rjust(width, ' ')
out.append(s)
else:
raise AssertionError()
if backslash_c: # 'printf %b a\cb xx' - \c terminates processing!
break
if arg_index >= num_args:
break
# Otherwise there are more args. So cycle through the loop once more to
# implement the 'arg recycling' behavior.
return 0