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sortix--sortix/sh/sh.cpp
2015-10-28 20:13:37 +01:00

2186 lines
50 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
sh.cpp
Command language interpreter.
*******************************************************************************/
#include <sys/wait.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <inttypes.h>
#include <ioleast.h>
#include <libgen.h>
#include <limits.h>
#include <locale.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
// Sortix libc doesn't have its own proper <limits.h> at this time.
#if defined(__sortix__)
#include <sortix/limits.h>
#endif
#include "editline.h"
#include "showline.h"
#include "util.h"
const char* builtin_commands[] =
{
"cd",
"exit",
"unset",
"clearenv",
(const char*) NULL,
};
int status = 0;
bool foreground_shell;
static bool is_proper_absolute_path(const char* path)
{
if ( path[0] == '\0' )
return false;
if ( path[0] != '/' )
return false;
while ( path[0] )
{
if ( path[0] == '/' )
path++;
else if ( path[0] == '.' &&
(path[1] == '\0' || path[1] == '/') )
return false;
else if ( path[0] == '.' &&
path[1] == '.' &&
(path[2] == '\0' || path[2] == '/') )
return false;
else
{
while ( *path && *path != '/' )
path++;
}
}
return true;
}
void update_env()
{
char str[3 * sizeof(size_t)];
struct winsize ws;
if ( tcgetwinsize(0, &ws) == 0 )
{
snprintf(str, sizeof(str), "%zu", ws.ws_col);
setenv("COLUMNS", str, 1);
snprintf(str, sizeof(str), "%zu", ws.ws_row);
setenv("LINES", str, 1);
}
}
bool matches_simple_pattern(const char* string, const char* pattern)
{
size_t wildcard_index = strcspn(pattern, "*");
if ( !pattern[wildcard_index] )
return strcmp(string, pattern) == 0;
if ( pattern[0] == '*' && string[0] == '.' )
return false;
size_t string_length = strlen(string);
size_t pattern_length = strlen(pattern);
size_t pattern_last = pattern_length - (wildcard_index + 1);
return strncmp(string, pattern, wildcard_index) == 0 &&
strcmp(string + string_length - pattern_last,
pattern + wildcard_index + 1) == 0;
}
void array_shrink_free(void*** array_ptr,
size_t* used_ptr,
size_t* length_ptr,
size_t new_used)
{
void** array;
memcpy(&array, array_ptr, sizeof(array)); // Strict aliasing.
for ( size_t i = new_used; i < *used_ptr; i++ )
{
void* value;
memcpy(&value, array + i, sizeof(value)); // Strict aliasing.
free(value);
}
*used_ptr = new_used;
(void) length_ptr;
}
char* token_finalize(const char* token)
{
struct stringbuf buf;
stringbuf_begin(&buf);
bool escape = false;
bool single_quote = false;
bool double_quote = false;
for ( size_t i = 0; token[i]; i++ )
{
if ( !escape && !single_quote && token[i] == '\\' )
{
escape = true;
}
else if ( !escape && !double_quote && token[i] == '\'' )
{
single_quote = !single_quote;
}
else if ( !escape && !single_quote && token[i] == '"' )
{
double_quote = !double_quote;
}
else if ( escape && token[i] == '\n' )
{
escape = false;
}
else
{
stringbuf_append_c(&buf, token[i]);
escape = false;
}
}
return stringbuf_finish(&buf);
}
bool is_identifier_char(char c)
{
return ('a' <= c && c <= 'z') ||
('A' <= c && c <= 'Z') ||
('0' <= c && c <= '9') ||
c == '_';
}
char* token_expand_variables(const char* token)
{
struct stringbuf buf;
stringbuf_begin(&buf);
bool escape = false;
bool single_quote = false;
bool double_quote = false;
for ( size_t i = 0; token[i]; i++ )
{
if ( !escape && !single_quote && token[i] == '\\' )
{
stringbuf_append_c(&buf, '\\');
escape = true;
}
else if ( !escape && !double_quote && token[i] == '\'' )
{
stringbuf_append_c(&buf, '\'');
single_quote = !single_quote;
}
else if ( !escape && !single_quote && token[i] == '"' )
{
stringbuf_append_c(&buf, '"');
double_quote = !double_quote;
}
else if ( !escape && !single_quote && token[i] == '$' && token[i + 1] )
{
i++;
const char* value;
if ( token[i] == '{' )
{
i++;
size_t length = 0;
while ( token[i + length] && token[i + length] != '}' )
length++;
char* variable = strndup(token + i, length);
if ( !variable )
return free(buf.string), (char*) NULL;
value = getenv(variable);
free(variable);
i += length;
if ( token[i] == '}' )
i++;
i--;
}
else if ( is_identifier_char(token[i]) )
{
size_t length = 1;
while ( is_identifier_char(token[i + length]) )
length++;
char* variable = strndup(token + i, length);
if ( !variable )
return free(buf.string), (char*) NULL;
value = getenv(variable);
free(variable);
i += length - 1;
}
else
{
char variable[2] = { token[i], '\0' };
value = getenv(variable);
}
for ( size_t n = 0; value && value[n]; n++ )
{
if ( double_quote && might_need_shell_quote(value[i]) )
stringbuf_append_c(&buf, '\\');
stringbuf_append_c(&buf, value[n]);
}
}
else
{
stringbuf_append_c(&buf, token[i]);
escape = false;
}
}
return stringbuf_finish(&buf);
}
bool token_split(void*** out,
size_t* out_used,
size_t* out_length,
const char* token)
{
size_t old_used = *out_used;
size_t index = 0;
while ( true )
{
while ( token[index] && isspace((unsigned char) token[index]) )
index++;
if ( !token[index] )
break;
struct stringbuf buf;
stringbuf_begin(&buf);
bool escape = false;
bool single_quote = false;
bool double_quote = false;
for ( ; token[index]; index++ )
{
if ( !escape && !single_quote && token[index] == '\\' )
{
stringbuf_append_c(&buf, '\\');
escape = true;
}
else if ( !escape && !double_quote && token[index] == '\'' )
{
stringbuf_append_c(&buf, '\'');
single_quote = !single_quote;
}
else if ( !escape && !single_quote && token[index] == '"' )
{
stringbuf_append_c(&buf, '"');
double_quote = !double_quote;
}
else if ( !(escape || single_quote || double_quote) &&
isspace((unsigned char) token[index]) )
{
break;
}
else if ( escape && token[index] == '\n' )
{
escape = false;
}
else
{
stringbuf_append_c(&buf, token[index]);
escape = false;
}
}
char* value = stringbuf_finish(&buf);
if ( !value )
{
array_shrink_free(out, out_used, out_length, old_used);
return false;
}
if ( !array_add(out, out_used, out_length, value) )
{
array_shrink_free(out, out_used, out_length, old_used);
return false;
}
}
return true;
}
bool token_expand_variables_split(void*** out,
size_t* out_used,
size_t* out_length,
const char* token)
{
char* expanded = token_expand_variables(token);
if ( !expanded )
return false;
bool result = token_split(out, out_used, out_length, expanded);
free(expanded);
return result;
}
static int strcoll_indirect(const void* a_ptr, const void* b_ptr)
{
const char* a = *(const char* const*) a_ptr;
const char* b = *(const char* const*) b_ptr;
return strcoll(a, b);
}
bool token_expand_wildcards(void*** out,
size_t* out_used,
size_t* out_length,
const char* token)
{
size_t old_used = *out_used;
size_t index = 0;
size_t num_escaped_wildcards = 0; // We don't properly support them yet.
stringbuf buf;
stringbuf_begin(&buf);
bool escape = false;
bool single_quote = false;
bool double_quote = false;
for ( ; token[index]; index++ )
{
if ( !escape && !single_quote && token[index] == '\\' )
{
escape = true;
}
else if ( !escape && !double_quote && token[index] == '\'' )
{
single_quote = !single_quote;
}
else if ( !escape && !single_quote && token[index] == '"' )
{
double_quote = !double_quote;
}
else if ( !(escape || single_quote || double_quote) &&
token[index] == '*' )
{
break;
}
else
{
if ( token[index] == '*' )
num_escaped_wildcards++;
stringbuf_append_c(&buf, token[index]);
escape = false;
}
}
if ( token[index] != '*' || num_escaped_wildcards )
{
free(stringbuf_finish(&buf));
just_return_input:
char* value = strdup(token);
if ( !value )
return false;
if ( !array_add(out, out_used, out_length, value) )
return free(value), false;
return true;
}
char* before = stringbuf_finish(&buf);
if ( !before )
return false;
stringbuf_begin(&buf);
index++;
for ( ; token[index]; index++ )
{
if ( !escape && !single_quote && token[index] == '\\' )
{
escape = true;
}
else if ( !escape && !double_quote && token[index] == '\'' )
{
single_quote = !single_quote;
}
else if ( !escape && !single_quote && token[index] == '"' )
{
double_quote = !double_quote;
}
else if ( !(escape || single_quote || double_quote) &&
token[index] == '*' )
{
break;
}
else
{
if ( token[index] == '*' )
num_escaped_wildcards++;
stringbuf_append_c(&buf, token[index]);
escape = false;
}
}
if ( token[index] == '*' )
{
// TODO: We don't support double use of wildcards yet.
free(stringbuf_finish(&buf));
free(before);
goto just_return_input;
}
char* after = stringbuf_finish(&buf);
if ( !after )
return free(before), false;
char* pattern;
if ( asprintf(&pattern, "%s*%s", before, after) < 0 )
return free(after), free(before), false;
free(after);
free(before);
size_t wildcard_pos = strcspn(pattern, "*");
bool found_slash = false;
size_t last_slash = 0;
for ( size_t n = 0; n < wildcard_pos; n++ )
if ( pattern[n] == '/' )
last_slash = n, found_slash = true;
size_t match_from = found_slash ? last_slash + 1 : 0;
size_t pattern_prefix = 0;
DIR* dir = NULL;
if ( !found_slash )
{
if ( !(dir = opendir(".")) )
{
free(pattern);
goto just_return_input;
}
}
else
{
char* dirpath = strdup(pattern);
if ( !dirpath )
{
free(pattern);
goto just_return_input;
}
dirpath[last_slash] = '\0';
pattern_prefix = last_slash + 1;
dir = opendir(dirpath);
free(dirpath);
if ( !dir )
{
free(pattern);
goto just_return_input;
}
}
size_t num_inserted = 0;
while ( struct dirent* entry = readdir(dir) )
{
if ( !matches_simple_pattern(entry->d_name, pattern + match_from) )
continue;
stringbuf_begin(&buf);
for ( size_t i = 0; i < pattern_prefix; i++ )
{
if ( pattern[i] == '\n' )
{
stringbuf_append_c(&buf, '\'');
stringbuf_append_c(&buf, '\n');
stringbuf_append_c(&buf, '\'');
}
else
{
if ( might_need_shell_quote(pattern[i]) )
stringbuf_append_c(&buf, '\\');
stringbuf_append_c(&buf, pattern[i]);
}
}
for ( size_t i = 0; entry->d_name[i]; i++ )
{
if ( entry->d_name[i] == '\n' )
{
stringbuf_append_c(&buf, '\'');
stringbuf_append_c(&buf, '\n');
stringbuf_append_c(&buf, '\'');
}
else
{
if ( might_need_shell_quote(entry->d_name[i]) )
stringbuf_append_c(&buf, '\\');
stringbuf_append_c(&buf, entry->d_name[i]);
}
}
char* name = stringbuf_finish(&buf);
if ( !name )
{
free(pattern);
closedir(dir);
array_shrink_free(out, out_used, out_length, old_used);
return false;
}
if ( !array_add(out, out_used, out_length, name) )
{
free(name);
free(pattern);
closedir(dir);
array_shrink_free(out, out_used, out_length, old_used);
return false;
}
num_inserted++;
}
closedir(dir);
free(pattern);
if ( num_inserted == 0 )
goto just_return_input;
char** out_tokens;
memcpy(&out_tokens, out, sizeof(out_tokens));
char** sort_from = out_tokens + old_used;
size_t sort_count = *out_used - old_used;
qsort(sort_from, sort_count, sizeof(char*), strcoll_indirect);
return true;
}
enum sh_tokenize_result
{
SH_TOKENIZE_RESULT_OK,
SH_TOKENIZE_RESULT_PARTIAL,
SH_TOKENIZE_RESULT_INVALID,
SH_TOKENIZE_RESULT_ERROR,
};
bool can_continue_operator(const char* op, char c)
{
if ( !op )
return false;
if ( op[0] == '<' && op[1] == '<' && op[2] == '\0' )
return c == '-';
if ( op[0] == '|' && op[1] == '\0' )
return c == '|';
if ( op[0] == '&' && op[1] == '\0' )
return c == '&';
if ( op[0] == ';' && op[1] == '\0' )
return c == ';';
if ( op[0] == '<' && op[1] == '\0' )
return c == '<' || c == '&' || c == '>';
if ( op[0] == '>' && op[1] == '\0' )
return c == '>' || c == '&' || c == '|';
if ( op[0] == '\0' )
return c == '|' || c == '&' || c == ';' || c == '>' || c == '<' ||
c == '(' || c == ')';
return false;
}
enum sh_tokenize_result sh_tokenize(const char* command,
char*** tokens_ptr,
size_t* tokens_used_ptr,
size_t* tokens_length_ptr)
{
enum sh_tokenize_result result = SH_TOKENIZE_RESULT_OK;
char** tokens = NULL;
size_t tokens_used = 0;
size_t tokens_length = 0;
size_t command_index = 0;
while ( true )
{
if ( command[command_index] == '\0' )
break;
if ( isspace((unsigned char) command[command_index]) )
{
command_index++;
continue;
}
if ( command[command_index] == '#' )
{
while ( command[command_index] != '\0' &&
command[command_index] != '\n' )
command_index++;
continue;
}
struct stringbuf buf;
stringbuf_begin(&buf);
bool escaped = false;
bool single_quote = false;
bool double_quote = false;
bool stop = false;
bool making_operator = false;
while ( true )
{
if ( command[command_index] == '\0' )
{
if ( escaped || single_quote || double_quote )
result = SH_TOKENIZE_RESULT_PARTIAL;
stop = true;
break;
}
else if ( making_operator )
{
if ( can_continue_operator(buf.string, command[command_index]) )
{
stringbuf_append_c(&buf, command[command_index]);
command_index++;
}
else
{
break;
}
}
else if ( buf.string && buf.length == 0 &&
can_continue_operator("", command[command_index]) )
{
stringbuf_append_c(&buf, command[command_index]);
making_operator = true;
command_index++;
}
else if ( !escaped && !single_quote && command[command_index] == '\\' )
{
stringbuf_append_c(&buf, '\\');
escaped = true;
command_index++;
}
else if ( !escaped && !double_quote && command[command_index] == '\'' )
{
stringbuf_append_c(&buf, '\'');
single_quote = !single_quote;
command_index++;
}
else if ( !escaped && !single_quote && command[command_index] == '"' )
{
stringbuf_append_c(&buf, '"');
double_quote = !double_quote;
command_index++;
}
else if ( !(escaped || single_quote || double_quote) &&
(isspace((unsigned char) command[command_index]) ||
can_continue_operator("", command[command_index])) )
{
break;
}
else if ( escaped && command[command_index] == '\n' )
{
if ( buf.string && buf.length && buf.string[buf.length - 1] == '\\' )
buf.string[--buf.length] = '\0';
command_index++;
escaped = false;
}
else
{
stringbuf_append_c(&buf, command[command_index]);
command_index++;
escaped = false;
}
}
char* token = stringbuf_finish(&buf);
if ( !token )
{
result = SH_TOKENIZE_RESULT_ERROR;
break;
}
if ( !array_add((void***) &tokens,
&tokens_used,
&tokens_length,
token) )
{
free(token);
result = SH_TOKENIZE_RESULT_ERROR;
break;
}
if ( stop )
break;
}
*tokens_ptr = tokens;
*tokens_used_ptr = tokens_used;
*tokens_length_ptr = tokens_length;
return result;
}
bool is_shell_input_ready(const char* input)
{
char** tokens = NULL;
size_t tokens_used = 0;
size_t tokens_length = 0;
enum sh_tokenize_result tokenize_result =
sh_tokenize(input, &tokens, &tokens_used, &tokens_length);
bool result = tokenize_result == SH_TOKENIZE_RESULT_OK;
for ( size_t i = 0; i < tokens_used; i++ )
free(tokens[i]);
free(tokens);
return result;
}
int lexical_chdir(char* path)
{
assert(path[0] == '/');
int fd = open("/", O_RDONLY | O_DIRECTORY);
if ( fd < 0 )
return -1;
size_t input_index = 1;
size_t output_index = 1;
while ( path[input_index] )
{
if ( path[input_index] == '/' )
{
if ( output_index && path[output_index-1] != '/' )
path[output_index++] = path[input_index];
input_index++;
continue;
}
char* elem = path + input_index;
size_t elem_length = strcspn(elem, "/");
char lc = elem[elem_length];
elem[elem_length] = '\0';
if ( !strcmp(elem, ".") )
{
elem[elem_length] = lc;
input_index += elem_length;
continue;
}
if ( !strcmp(elem, "..") )
{
elem[elem_length] = lc;
input_index += elem_length;
if ( 2 <= output_index && path[output_index-1] == '/' )
output_index--;
while ( 2 <= output_index && path[output_index-1] != '/' )
output_index--;
if ( 2 <= output_index && path[output_index-1] == '/' )
output_index--;
lc = path[output_index];
path[output_index] = '\0';
int new_fd = open(path, O_RDONLY | O_DIRECTORY);
close(fd);
if ( new_fd < 0 )
return -1;
fd = new_fd;
path[output_index] = lc;
continue;
}
if ( 0 <= fd )
{
int new_fd = openat(fd, elem, O_RDONLY | O_DIRECTORY);
if ( new_fd < 0 )
close(fd);
fd = new_fd;
}
for ( size_t i = 0; i < elem_length; i++ )
path[output_index++] = path[input_index++];
elem[elem_length] = lc;
}
path[output_index] = '\0';
if ( 2 <= output_index && path[output_index-1] == '/' )
path[--output_index] = '\0';
int fchdir_ret = fchdir(fd);
close(fd);
if ( fchdir_ret < 0 )
return -1;
unsetenv("PWD");
setenv("PWD", path, 1);
return 0;
}
int perform_chdir(const char* path)
{
if ( !path[0] )
return errno = ENOENT, -1;
char* lexical_path = NULL;
if ( path[0] == '/' )
lexical_path = strdup(path);
else
{
char* current_pwd = get_current_dir_name();
if ( current_pwd )
{
assert(current_pwd[0] == '/');
asprintf(&lexical_path, "%s/%s", current_pwd, path);
free(current_pwd);
}
else if ( getenv("PWD") )
{
asprintf(&lexical_path, "/%s/%s", getenv("PWD"), path);
}
}
if ( lexical_path )
{
int ret = lexical_chdir(lexical_path);
free(lexical_path);
if ( ret == 0 )
return 0;
}
return chdir(path);
}
bool is_variable_assignment_token(const char* token)
{
size_t i = 0;
while ( is_identifier_char(token[i]) )
i++;
return i != 0 && token[i] == '=';
}
struct execute_result
{
pid_t pid;
int internal_status;
bool failure;
bool critical;
bool internal;
bool exited;
};
struct execute_result execute(const char* const* tokens,
size_t tokens_count,
bool interactive,
int pipein,
int pipeout,
pid_t pgid)
{
char** varsv;
size_t varsc;
size_t varsv_allocated;
char** expandv;
size_t expandc;
size_t expandv_allocated;
char** argv;
size_t argc;
size_t argv_allocated;
bool internal;
bool failure = false;
bool critical = false;
bool do_exit = false;
bool set_pipein = false;
bool set_pipeout = false;
bool had_not_varassign = false;
pid_t childpid;
update_env();
char statusstr[sizeof(int) * 3];
snprintf(statusstr, sizeof(statusstr), "%i", status);
setenv("?", statusstr, 1);
varsv = NULL;
varsc = 0;
varsv_allocated = 0;
expandv = NULL;
expandc = 0;
expandv_allocated = 0;
for ( size_t i = 0; !failure && i < tokens_count; i++ )
{
if ( !had_not_varassign && is_variable_assignment_token(tokens[i]))
{
char* value = token_expand_variables(tokens[i]);
if ( !value )
{
error(0, errno, "variable expansion");
failure = true;
critical = true;
break;
}
if ( !array_add((void***) &varsv,
&varsc,
&varsv_allocated,
value) )
{
free(value);
error(0, errno, "variable expansion");
failure = true;
critical = true;
break;
}
}
else
{
had_not_varassign = true;
if ( !token_expand_variables_split((void***) &expandv,
&expandc,
&expandv_allocated,
tokens[i]) )
{
error(0, errno, "variable expansion");
failure = true;
critical = true;
break;
}
}
}
argv = NULL;
argc = 0;
argv_allocated = 0;
for ( size_t i = 0; !failure && i < expandc; i++ )
{
if ( !strcmp(expandv[i], "<") ||
!strcmp(expandv[i], ">") ||
/*!strcmp(expandv[i], "<<") ||*/
!strcmp(expandv[i], ">>") )
{
const char* type = expandv[i++];
if ( i == expandc )
{
error(0, errno, "%s: expected argument", type);
failure = true;
critical = true;
break;
}
char** targets = NULL;
size_t targets_used = 0;
size_t targets_length = 0;
if ( !token_expand_wildcards((void***) &targets,
&targets_used,
&targets_length,
expandv[i]) )
{
error(0, errno, "wildcard expansion");
failure = true;
critical = true;
break;
}
if ( targets_used != 1 )
{
error(0, 0, "%s: ambiguous redirect: %s", type, expandv[i]);
for ( size_t i = 0; i < targets_used; i++ )
free(targets[i]);
free(targets);
failure = true;
break;
}
char* target = token_finalize(targets[0]);
free(targets[0]);
free(targets);
if ( !target )
{
error(0, errno, "token finalization");
failure = true;
break;
}
int fd = -1;
if ( !strcmp(type, "<") )
fd = open(target, O_RDONLY | O_CLOEXEC);
else if ( !strcmp(type, ">") )
fd = open(target, O_WRONLY | O_CREATE | O_TRUNC | O_CLOEXEC, 0666);
else if ( !strcmp(type, ">>") )
fd = open(target, O_WRONLY | O_CREATE | O_APPEND | O_CLOEXEC, 0666);
if ( fd < 0 )
{
error(0, errno, "%s", target);
free(target);
failure = true;
break;
}
if ( !strcmp(type, "<") )
{
pipein = fd;
set_pipein = true;
}
else if ( !strcmp(type, ">") || !strcmp(type, ">>") )
{
pipeout = fd;
set_pipeout = true;
}
free(target);
}
else
{
if ( !token_expand_wildcards((void***) &argv,
&argc,
&argv_allocated,
expandv[i]) )
{
error(0, errno, "wildcard expansion");
failure = true;
critical = true;
break;
}
}
}
for ( size_t i = 0; i < expandc; i++ )
free(expandv[i]);
free(expandv);
if ( !array_add((void***) &argv, &argc, &argv_allocated, (char*) NULL) )
{
failure = true;
critical = true;
}
else
{
argc--; // Don't count the NULL.
}
for ( size_t i = 0; i < varsc; i++ )
{
char* var = token_finalize(varsv[i]);
if ( !var )
{
error(0, errno, "token finalization");
failure = true;
break;
}
free(varsv[i]);
varsv[i] = var;
}
for ( size_t i = 0; i < argc; i++ )
{
char* arg = token_finalize(argv[i]);
if ( !arg )
{
error(0, errno, "token finalization");
failure = true;
break;
}
free(argv[i]);
argv[i] = arg;
}
// TODO: Builtins should be run in a child process if & or |.
int internal_status = status;
if ( failure )
{
internal = true;
internal_status = 1;
}
else if ( argc == 0 )
{
internal = true;
for ( size_t i = 0; i < varsc; i++ )
{
char* key = varsv[i];
char* eq = strchr(key, '=');
if ( !eq )
continue;
*eq = '\0';
char* value = eq + 1;
int ret = setenv(key, value, 1);
*eq = '=';
if ( ret < 0 )
{
error(0, errno, "setenv");
internal_status = 1;
}
}
}
else if ( strcmp(argv[0], "cd") == 0 )
{
internal = true;
const char* newdir = argv[1];
if ( !newdir )
newdir = getenv_safe("HOME", "/");
internal_status = 0;
if ( perform_chdir(newdir) < 0 )
{
error(0, errno, "cd: %s", newdir);
internal_status = 1;
}
}
else if ( strcmp(argv[0], "exit") == 0 )
{
internal = true;
int exitcode = argv[1] ? atoi(argv[1]) : 0;
exitcode = (unsigned char) exitcode;
do_exit = true;
internal_status = exitcode;
}
else if ( strcmp(argv[0], "unset") == 0 )
{
internal = true;
unsetenv(argv[1] ? argv[1] : "");
internal_status = 0;
}
else if ( strcmp(argv[0], "clearenv") == 0 )
{
internal = true;
clearenv();
internal_status = 0;
}
else
{
internal = false;
}
if ( (childpid = internal ? getpid() : fork()) < 0 )
{
error(0, errno, "fork");
internal_status = 1;
failure = true;
internal = true;
childpid = getpid();
}
if ( childpid )
{
if ( set_pipein )
close(pipein);
if ( set_pipeout )
close(pipeout);
for ( size_t i = 0; i < varsc; i++ )
free(varsv[i]);
free(varsv);
for ( size_t i = 0; i < argc; i++ )
free(argv[i]);
free(argv);
if ( internal )
{
struct execute_result result;
memset(&result, 0, sizeof(result));
result.internal_status = internal_status;
result.failure = failure;
result.critical = critical;
result.internal = true;
result.exited = do_exit;
return result;
}
setpgid(childpid, pgid != -1 ? pgid : childpid);
// TODO: This is an inefficient manner to avoid a race condition where
// a pipeline foo | bar is running in its own process group and
// foo is the process group leader that sets itself as the
// foreground process group, but bar dies prior to foo's tcsetpgrp
// call, because then the shell would run tcsetpgrp to take back
// control, and only then would foo do its tcsetpgrp call.
while ( foreground_shell && pgid == -1 && tcgetpgrp(0) != childpid )
sched_yield();
struct execute_result result;
memset(&result, 0, sizeof(result));
result.pid = childpid;
result.internal = false;
return result;
}
setpgid(0, pgid != -1 ? pgid : 0);
if ( foreground_shell && pgid == -1 )
{
sigset_t oldset, sigttou;
sigemptyset(&sigttou);
sigaddset(&sigttou, SIGTTOU);
sigprocmask(SIG_BLOCK, &sigttou, &oldset);
tcsetpgrp(0, getpgid(0));
sigprocmask(SIG_SETMASK, &oldset, NULL);
}
if ( pipein != 0 )
dup2(pipein, 0);
if ( pipeout != 1 )
dup2(pipeout, 1);
for ( size_t i = 0; i < varsc; i++ )
{
char* key = varsv[i];
char* eq = strchr(key, '=');
if ( !eq )
continue;
*eq = '\0';
char* value = eq + 1;
int ret = setenv(key, value, 1);
*eq = '=';
if ( ret < 0 )
{
error(0, errno, "setenv");
status = 1;
}
}
execvp(argv[0], argv);
if ( interactive && errno == ENOENT )
{
int errno_saved = errno;
execlp("command-not-found", "command-not-found", argv[0], NULL);
errno = errno_saved;
}
error(127, errno, "%s", argv[0]);
__builtin_unreachable();
}
int run_tokens(const char* const* tokens,
size_t tokens_count,
bool interactive,
bool exit_on_error,
bool* script_exited)
{
size_t cmdnext = 0;
size_t cmdstart;
size_t cmdend;
int pipein = 0;
int pipeout = 1;
int pipeinnext = 0;
const char* execmode;
pid_t pgid = -1;
bool short_circuited_and = false;
bool short_circuited_or = false;
// Collect any pending zombie processes.
while ( 0 < waitpid(-1, NULL, WNOHANG) );
readcmd:
cmdstart = cmdnext;
if ( cmdstart == tokens_count )
return status;
for ( cmdend = cmdstart; cmdend < tokens_count; cmdend++ )
{
const char* token = tokens[cmdend];
if ( strcmp(token, ";") == 0 ||
strcmp(token, "&") == 0 ||
strcmp(token, "&&") == 0 ||
strcmp(token, "|") == 0 ||
strcmp(token, "||") == 0 ||
false )
break;
}
if ( cmdend < tokens_count )
{
execmode = tokens[cmdend];
cmdnext = cmdend + 1;
}
else
{
execmode = ";";
cmdnext = cmdend;
}
if ( short_circuited_or )
{
if ( !strcmp(execmode, ";") ||
!strcmp(execmode, "&") )
{
short_circuited_and = false;
short_circuited_or = false;
}
goto readcmd;
}
if ( short_circuited_and )
{
if ( !strcmp(execmode, ";") ||
!strcmp(execmode, "&") ||
!strcmp(execmode, "||") )
short_circuited_and = false;
goto readcmd;
}
if ( strcmp(execmode, "|") == 0 )
{
int pipes[2];
if ( pipe2(pipes, O_CLOEXEC) < 0 )
{
error(0, errno, "pipe");
if ( !interactive || exit_on_error )
*script_exited = true;
return status = 1;
}
else
{
if ( pipeout != 1 )
close(pipeout);
pipeout = pipes[1];
if ( pipeinnext != 0 )
close(pipeinnext);
pipeinnext = pipes[0];
}
}
struct execute_result result =
execute(tokens + cmdstart,
cmdend - cmdstart,
interactive,
pipein,
pipeout,
pgid);
if ( !result.internal && pgid == -1 )
pgid = result.pid;
if ( pipein != 0 )
{
close(pipein);
pipein = 0;
}
if ( pipeout != 1 )
{
close(pipeout);
pipeout = 1;
}
if ( pipeinnext != 0 )
{
pipein = pipeinnext;
pipeinnext = 0;
}
if ( result.critical )
{
if ( !interactive || exit_on_error )
*script_exited = true;
return status = result.internal_status;
}
if ( result.exited )
{
*script_exited = true;
return status = result.internal_status;
}
if ( strcmp(execmode, "&") == 0 )
{
// TODO: We probably shouldn't have made the progress group foreground
// as that may have side effects if a process checks for this
// behavior and then unexpectedly the shell takes back support
// without the usual ^Z mechanism.
sigset_t oldset, sigttou;
sigemptyset(&sigttou);
sigaddset(&sigttou, SIGTTOU);
sigprocmask(SIG_BLOCK, &sigttou, &oldset);
tcsetpgrp(0, getpgid(0));
sigprocmask(SIG_SETMASK, &oldset, NULL);
pgid = -1;
status = 0;
goto readcmd;
}
if ( strcmp(execmode, "|") == 0 )
goto readcmd;
if ( result.internal )
{
status = result.internal_status;
}
else
{
int exitstatus;
if ( waitpid(result.pid, &exitstatus, 0) < 0 )
{
error(0, errno, "waitpid");
if ( !interactive || exit_on_error )
*script_exited = true;
status = 1;
return status;
}
sigset_t oldset, sigttou;
sigemptyset(&sigttou);
sigaddset(&sigttou, SIGTTOU);
sigprocmask(SIG_BLOCK, &sigttou, &oldset);
tcsetpgrp(0, getpgid(0));
sigprocmask(SIG_SETMASK, &oldset, NULL);
if ( WIFSIGNALED(exitstatus) && WTERMSIG(exitstatus) == SIGINT )
printf("^C\n");
else if ( WIFSIGNALED(exitstatus) && WTERMSIG(exitstatus) != SIGPIPE )
printf("%s\n", strsignal(WTERMSIG(exitstatus)));
status = WEXITSTATUS(exitstatus);
}
pgid = -1;
if ( !strcmp(execmode, "&&") )
{
if ( status != 0 )
short_circuited_and = true;
}
else if ( !strcmp(execmode, "||") )
{
if ( status == 0 )
short_circuited_or = true;
}
else if ( exit_on_error && status != 0 )
{
*script_exited = true;
return status;
}
goto readcmd;
}
int run_command(char* command,
bool interactive,
bool exit_on_error,
bool* script_exited)
{
int result;
char** tokens = NULL;
size_t tokens_used = 0;
size_t tokens_length = 0;
enum sh_tokenize_result tokenize_result =
sh_tokenize(command, &tokens, &tokens_used, &tokens_length);
if ( tokenize_result == SH_TOKENIZE_RESULT_OK )
{
result = run_tokens(tokens, tokens_used, interactive, exit_on_error,
script_exited);
}
else
{
if ( !interactive )
*script_exited = true;
result = 255;
}
for ( size_t i = 0; i < tokens_used; i++ )
free(tokens[i]);
free(tokens);
return result;
}
bool does_line_editing_need_another_line(void*, const char* line)
{
return !is_shell_input_ready(line);
}
bool is_outermost_shell()
{
const char* shlvl_str = getenv("SHLVL");
if ( !shlvl_str )
return true;
return atol(shlvl_str) <= 1;
}
void on_trap_eof(void* edit_state_ptr)
{
if ( is_outermost_shell() )
return;
struct edit_line* edit_state = (struct edit_line*) edit_state_ptr;
edit_line_type_codepoint(edit_state, L'e');
edit_line_type_codepoint(edit_state, L'x');
edit_line_type_codepoint(edit_state, L'i');
edit_line_type_codepoint(edit_state, L't');
}
bool is_usual_char_for_completion(char c)
{
return !isspace((unsigned char) c) &&
c != ';' && c != '&' && c != '|' &&
c != '<' && c != '>' && c != '#' && c != '$';
}
size_t do_complete(char*** completions_ptr,
size_t* used_before_ptr,
size_t* used_after_ptr,
void*,
const char* partial,
size_t complete_at)
{
size_t used_before = 0;
size_t used_after = 0;
while ( complete_at - used_before &&
is_usual_char_for_completion(partial[complete_at - (used_before+1)]) )
used_before++;
#if 0
while ( partial[complete_at + used_after] &&
is_usual_char_for_completion(partial[complete_at + used_after]) )
used_after++;
#endif
enum complete_type
{
COMPLETE_TYPE_FILE,
COMPLETE_TYPE_EXECUTABLE,
COMPLETE_TYPE_DIRECTORY,
COMPLETE_TYPE_PROGRAM,
COMPLETE_TYPE_VARIABLE,
};
enum complete_type complete_type = COMPLETE_TYPE_FILE;
if ( complete_at - used_before && partial[complete_at - used_before-1] == '$' )
{
complete_type = COMPLETE_TYPE_VARIABLE;
used_before++;
}
else
{
size_t type_offset = complete_at - used_before;
while ( type_offset && isspace((unsigned char) partial[type_offset-1]) )
type_offset--;
if ( 2 <= type_offset &&
strncmp(partial + type_offset - 2, "cd", 2) == 0 &&
(type_offset == 2 || !is_usual_char_for_completion(partial[type_offset-2-1])) )
complete_type = COMPLETE_TYPE_DIRECTORY;
else if ( !type_offset ||
partial[type_offset-1] == ';' ||
partial[type_offset-1] == '&' ||
partial[type_offset-1] == '|' )
{
if ( memchr(partial + complete_at - used_before, '/', used_before) )
complete_type = COMPLETE_TYPE_EXECUTABLE;
else
complete_type = COMPLETE_TYPE_PROGRAM;
}
}
char** completions = NULL;
size_t completions_count = 0;
size_t completions_length = 0;
if ( complete_type == COMPLETE_TYPE_PROGRAM ) do
{
for ( size_t i = 0; builtin_commands[i]; i++ )
{
const char* builtin = builtin_commands[i];
if ( strncmp(builtin, partial + complete_at - used_before, used_before) != 0 )
continue;
// TODO: Add allocation check!
array_add((void***) &completions,
&completions_count,
&completions_length,
strdup(builtin + used_before));
}
char* path = strdup_safe(getenv("PATH"));
if ( !path )
{
complete_type = COMPLETE_TYPE_FILE;
break;
}
char* path_input = path;
char* component;
while ( (component = strsep(&path_input, ":")) )
{
if ( DIR* dir = opendir(component) )
{
while ( struct dirent* entry = readdir(dir) )
{
if ( strncmp(entry->d_name, partial + complete_at - used_before, used_before) != 0 )
continue;
if ( used_before == 0 && entry->d_name[0] == '.' )
continue;
// TODO: Add allocation check!
array_add((void***) &completions,
&completions_count,
&completions_length,
strdup(entry->d_name + used_before));
}
closedir(dir);
}
}
free(path);
} while ( false );
if ( complete_type == COMPLETE_TYPE_FILE ||
complete_type == COMPLETE_TYPE_EXECUTABLE ||
complete_type == COMPLETE_TYPE_DIRECTORY ) do
{
const char* pattern = partial + complete_at - used_before;
size_t pattern_length = used_before;
char* dirpath_alloc = NULL;
const char* dirpath;
if ( !memchr(pattern, '/', pattern_length) )
dirpath = ".";
else if ( pattern_length && pattern[pattern_length-1] == '/' )
{
dirpath_alloc = strndup(pattern, pattern_length);
if ( !dirpath_alloc )
break;
dirpath = dirpath_alloc;
pattern += pattern_length;
pattern_length = 0;
}
else
{
dirpath_alloc = strndup(pattern, pattern_length);
if ( !dirpath_alloc )
break;
dirpath = dirname(dirpath_alloc);
const char* last_slash = (const char*) memrchr(pattern, '/', pattern_length);
size_t last_slash_offset = (uintptr_t) last_slash - (uintptr_t) pattern;
pattern += last_slash_offset + 1;
pattern_length -= last_slash_offset + 1;
}
used_before = pattern_length;
DIR* dir = opendir(dirpath);
if ( !dir )
{
free(dirpath_alloc);
break;
}
while ( struct dirent* entry = readdir(dir) )
{
if ( strncmp(entry->d_name, pattern, pattern_length) != 0 )
continue;
if ( pattern_length == 0 && entry->d_name[0] == '.' )
continue;
struct stat st;
bool is_directory = entry->d_type == DT_DIR ||
(entry->d_type == DT_UNKNOWN &&
!fstatat(dirfd(dir), entry->d_name, &st, 0) &&
S_ISDIR(st.st_mode));
bool is_executable = complete_type == COMPLETE_TYPE_EXECUTABLE &&
!fstatat(dirfd(dir), entry->d_name, &st, 0) &&
st.st_mode & 0111;
if ( complete_type == COMPLETE_TYPE_DIRECTORY && !is_directory )
continue;
if ( complete_type == COMPLETE_TYPE_EXECUTABLE &&
!(is_directory || is_executable) )
continue;
size_t name_length = strlen(entry->d_name);
char* completion = (char*) malloc(name_length - pattern_length + 1 + 1);
if ( !completion )
continue;
strcpy(completion, entry->d_name + pattern_length);
if ( is_directory )
strcat(completion, "/");
// TODO: Add allocation check!
array_add((void***) &completions,
&completions_count,
&completions_length,
completion);
}
closedir(dir);
free(dirpath_alloc);
} while ( false );
if ( complete_type == COMPLETE_TYPE_VARIABLE ) do
{
const char* pattern = partial + complete_at - used_before + 1;
size_t pattern_length = used_before - 1;
if ( memchr(pattern, '=', pattern_length) )
break;
for ( size_t i = 0; environ[i]; i++ )
{
if ( strncmp(pattern, environ[i], pattern_length) != 0 )
continue;
const char* rest = environ[i] + pattern_length;
size_t equal_offset = strcspn(rest, "=");
if ( rest[equal_offset] != '=' )
continue;
// TODO: Add allocation check!
array_add((void***) &completions,
&completions_count,
&completions_length,
strndup(rest, equal_offset));
}
} while ( false );
*used_before_ptr = used_before;
*used_after_ptr = used_after;
return *completions_ptr = completions, completions_count;
}
struct sh_read_command
{
char* command;
bool abort_condition;
bool eof_condition;
bool error_condition;
};
void read_command_interactive(struct sh_read_command* sh_read_command)
{
update_env();
static struct edit_line edit_state; // static to preserve command history.
edit_state.in_fd = 0;
edit_state.out_fd = 1;
edit_state.check_input_incomplete_context = NULL;
edit_state.check_input_incomplete = does_line_editing_need_another_line;
edit_state.trap_eof_opportunity_context = &edit_state;
edit_state.trap_eof_opportunity = on_trap_eof;
edit_state.complete_context = NULL;
edit_state.complete = do_complete;
char* current_dir = get_current_dir_name();
const char* print_username = getlogin();
if ( !print_username )
print_username = getuid() == 0 ? "root" : "?";
char hostname[HOST_NAME_MAX + 1];
if ( gethostname(hostname, sizeof(hostname)) < 0 )
strlcpy(hostname, "(none)", sizeof(hostname));
const char* print_hostname = hostname;
const char* print_dir = current_dir ? current_dir : "?";
const char* home_dir = getenv_safe("HOME", "");
const char* print_dir_1 = print_dir;
const char* print_dir_2 = "";
size_t home_dir_len = strlen(home_dir);
if ( home_dir_len && strncmp(print_dir, home_dir, home_dir_len) == 0 )
{
print_dir_1 = "~";
print_dir_2 = print_dir + home_dir_len;
}
char* ps1;
asprintf(&ps1, "\e[32m%s@%s \e[36m%s%s #\e[37m ",
print_username,
print_hostname,
print_dir_1,
print_dir_2);
free(current_dir);
edit_state.ps1 = ps1;
edit_state.ps2 = "> ";
edit_line(&edit_state);
free(ps1);
if ( edit_state.abort_editing )
{
sh_read_command->abort_condition = true;
return;
}
if ( edit_state.eof_condition )
{
sh_read_command->eof_condition = true;
return;
}
char* command = edit_line_result(&edit_state);
assert(command);
sh_read_command->command = command;
}
void read_command_non_interactive(struct sh_read_command* sh_read_command,
FILE* fp)
{
int fd = fileno(fp);
size_t command_used = 0;
size_t command_length = 1024;
char* command = (char*) malloc(command_length + 1);
if ( !command )
error(64, errno, "malloc");
command[0] = '\0';
while ( true )
{
char c;
if ( 0 <= fd )
{
ssize_t bytes_read = read(fd, &c, sizeof(c));
if ( bytes_read < 0 )
{
sh_read_command->error_condition = true;
free(command);
return;
}
else if ( bytes_read == 0 )
{
if ( command_used == 0 )
{
sh_read_command->eof_condition = true;
free(command);
return;
}
else
{
c = '\n';
}
}
else
{
assert(bytes_read == 1);
if ( c == '\0' )
continue;
}
}
else
{
int ic = fgetc(fp);
if ( ic == EOF && ferror(fp) )
{
sh_read_command->error_condition = true;
free(command);
return;
}
else if ( ic == EOF )
{
if ( command_used == 0 )
{
sh_read_command->eof_condition = true;
free(command);
return;
}
else
{
c = '\n';
}
}
else
{
c = (char) (unsigned char) ic;
if ( c == '\0' )
continue;
}
}
if ( c == '\n' && is_shell_input_ready(command) )
break;
if ( command_used == command_length )
{
size_t new_length = command_length * 2;
char* new_command = (char*) realloc(command, new_length + 1);
if ( !new_command )
error(64, errno, "realloc");
command = new_command;
command_length = new_length;
}
command[command_used++] = c;
command[command_used] = '\0';
}
sh_read_command->command = command;
}
int run(FILE* fp,
const char* fp_name,
bool interactive,
bool exit_on_error,
bool* script_exited,
int status)
{
// TODO: The interactive read code should cope when the input is not a
// terminal; it should print the prompt and then read normally without
// any line editing features.
if ( !isatty(fileno(fp)) || !foreground_shell )
interactive = false;
while ( true )
{
struct sh_read_command sh_read_command;
memset(&sh_read_command, 0, sizeof(sh_read_command));
if ( interactive )
read_command_interactive(&sh_read_command);
else
read_command_non_interactive(&sh_read_command, fp);
if ( sh_read_command.abort_condition )
continue;
if ( sh_read_command.eof_condition )
{
if ( interactive && is_outermost_shell() )
{
printf("Type exit to close the outermost shell.\n");
continue;
}
break;
}
if ( sh_read_command.error_condition )
{
error(0, errno, "read: %s", fp_name);
return *script_exited = true, 2;
}
status = run_command(sh_read_command.command, interactive,
exit_on_error, script_exited);
free(sh_read_command.command);
if ( *script_exited || (status == 0 && exit_on_error) )
break;
}
return status;
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION...] [SCRIPT [ARGUMENT...]]\n", argv0);
fprintf(fp, " or: %s [OPTION...] -c COMMAND [ARGUMENT...]\n", argv0);
fprintf(fp, " or: %s [OPTION...] -s [ARGUMENT...]\n", argv0);
#if 0
fprintf(fp, " -a, +a set -a\n");
fprintf(fp, " -b, +b set -b\n");
#endif
fprintf(fp, " -c execute the first operand as the command\n");
#if 0
fprintf(fp, " -C, +C set -C\n");
fprintf(fp, " -e, +e set -e\n");
fprintf(fp, " -f, +f set -f\n");
fprintf(fp, " -h, +h set -h\n");
#endif
fprintf(fp, " -i shell is interactive\n");
#if 0
fprintf(fp, " -m, +m set -m\n");
fprintf(fp, " -n, +n set -n\n");
fprintf(fp, " -o OPTION set -o OPTION\n");
fprintf(fp, " +o OPTION set +o OPTION\n");
#endif
fprintf(fp, " -s read commands from the standard input\n");
#if 0
fprintf(fp, " -u, +u set -u\n");
fprintf(fp, " -v, +v set -v\n");
fprintf(fp, " -x, +x set -x\n");
#endif
fprintf(fp, " --help display this help and exit\n");
fprintf(fp, " --version output version information and exit\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
foreground_shell = isatty(0) && tcgetpgrp(0) == getpgid(0);
// TODO: Canonicalize argv[0] if it contains a slash and isn't absolute?
if ( const char* env_pwd = getenv("PWD") )
{
if ( !is_proper_absolute_path(env_pwd) )
{
unsetenv("PWD");
char* real_pwd = get_current_dir_name();
if ( real_pwd )
setenv("PWD", real_pwd, 1);
free(real_pwd);
}
}
bool flag_c_first_operand_is_command = false;
bool flag_e_exit_on_error = false;
bool flag_i_interactive = false;
bool flag_s_stdin = false;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( (arg[0] != '-' && arg[0] != '+') || !arg[1] )
break; // Intentionally not continue and note '+' support.
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[0] == '+' )
{
while ( char c = *++arg ) switch ( c )
{
case 'e': flag_e_exit_on_error = false; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'c': flag_c_first_operand_is_command = true; break;
case 'e': flag_e_exit_on_error = true; break;
case 'i': flag_i_interactive = true; break;
case 's': flag_s_stdin = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
if ( getenv("SHLVL") )
{
long shlvl = atol(getenv("SHLVL"));
if ( shlvl < 1 )
shlvl = 1;
else if ( shlvl < LONG_MAX )
shlvl++;
char shlvl_string[sizeof(long) * 3];
snprintf(shlvl_string, sizeof(shlvl_string), "%li", shlvl);
setenv("SHLVL", shlvl_string, 1);
}
else
{
setenv("SHLVL", "1", 1);
}
char pidstr[3 * sizeof(pid_t)];
char ppidstr[3 * sizeof(pid_t)];
snprintf(pidstr, sizeof(pidstr), "%ji", (intmax_t) getpid());
snprintf(ppidstr, sizeof(ppidstr), "%ji", (intmax_t) getppid());
setenv("SHELL", argv[0], 1);
setenv("$", pidstr, 1);
setenv("PPID", ppidstr, 1);
setenv("?", "0", 1);
setenv("0", argv[0], 1);
bool script_exited = false;
int status = 0;
if ( flag_c_first_operand_is_command )
{
if ( argc <= 1 )
error(2, 0, "option -c expects an operand");
for ( int i = 2; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 2);
setenv(varname, argv[i], 1);
}
const char* command = argv[1];
size_t command_length = strlen(command);
FILE* fp = fmemopen((void*) command, command_length, "r");
if ( !fp )
error(2, errno, "fmemopen");
status = run(fp, "<command-line>", false, flag_e_exit_on_error,
&script_exited, status);
fclose(fp);
if ( script_exited || (status != 0 && flag_e_exit_on_error) )
exit(status);
if ( flag_s_stdin )
{
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error,
&script_exited, status);
if ( script_exited || (status != 0 && flag_e_exit_on_error) )
exit(status);
}
}
else if ( flag_s_stdin )
{
for ( int i = 1; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 1);
setenv(varname, argv[i], 1);
}
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error,
&script_exited, status);
if ( script_exited || (status != 0 && flag_e_exit_on_error) )
exit(status);
}
else if ( 2 <= argc )
{
for ( int i = 1; i < argc; i++ )
{
char varname[sizeof(int) * 3];
snprintf(varname, sizeof(varname), "%i", i - 1);
setenv(varname, argv[i], 1);
}
const char* path = argv[1];
FILE* fp = fopen(path, "r");
if ( !fp )
error(127, errno, "%s", path);
status = run(fp, path, false, flag_e_exit_on_error, &script_exited,
status);
fclose(fp);
if ( script_exited || (status != 0 && flag_e_exit_on_error) )
exit(status);
}
else
{
bool is_interactive = flag_i_interactive || isatty(fileno(stdin));
status = run(stdin, "<stdin>", is_interactive, flag_e_exit_on_error,
&script_exited, status);
if ( script_exited || (status != 0 && flag_e_exit_on_error) )
exit(status);
}
return 0;
}