hush: preparatory patch for NOMMU-safe { list } handling.
function old new delta o_addblock - 58 +58 o_addstr_with_NUL - 27 +27 builtin_exit 47 49 +2 run_list 2020 2018 -2 o_addstrauto 27 - -27 parse_stream 1508 1461 -47 o_addstr 58 - -58 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 1/2 up/down: 87/-134) Total: -47 bytes
This commit is contained in:
Denis Vlasenko
parent
42e78b978f
commit
9aa7d6fdc5
291
shell/hush.c
291
shell/hush.c
@ -73,10 +73,18 @@
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#if ENABLE_HUSH_CASE
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#include <fnmatch.h>
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#endif
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#include "math.h"
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#define HUSH_VER_STR "0.92"
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#ifdef WANT_TO_TEST_NOMMU
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# undef BB_MMU
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# undef USE_FOR_NOMMU
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# undef USE_FOR_MMU
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# define BB_MMU 0
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# define USE_FOR_NOMMU(...) __VA_ARGS__
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# define USE_FOR_MMU(...)
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#endif
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#define HUSH_VER_STR "0.93"
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#if defined SINGLE_APPLET_MAIN
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/* STANDALONE does not make sense, and won't compile */
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@ -298,6 +306,45 @@ typedef enum reserved_style {
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RES_SNTX
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} reserved_style;
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typedef struct o_string {
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char *data;
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int length; /* position where data is appended */
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int maxlen;
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/* Protect newly added chars against globbing
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* (by prepending \ to *, ?, [, \) */
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smallint o_escape;
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smallint o_glob;
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smallint nonnull;
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smallint has_empty_slot;
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smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
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} o_string;
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enum {
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MAYBE_ASSIGNMENT = 0,
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DEFINITELY_ASSIGNMENT = 1,
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NOT_ASSIGNMENT = 2,
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WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */
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};
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/* Used for initialization: o_string foo = NULL_O_STRING; */
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#define NULL_O_STRING { NULL }
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/* I can almost use ordinary FILE*. Is open_memstream() universally
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* available? Where is it documented? */
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typedef struct in_str {
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const char *p;
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/* eof_flag=1: last char in ->p is really an EOF */
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char eof_flag; /* meaningless if ->p == NULL */
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char peek_buf[2];
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#if ENABLE_HUSH_INTERACTIVE
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smallint promptme;
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smallint promptmode; /* 0: PS1, 1: PS2 */
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#endif
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FILE *file;
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int (*get) (struct in_str *);
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int (*peek) (struct in_str *);
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} in_str;
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#define i_getch(input) ((input)->get(input))
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#define i_peek(input) ((input)->peek(input))
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struct redir_struct {
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struct redir_struct *next;
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char *rd_filename; /* filename */
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@ -311,8 +358,11 @@ struct command {
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int assignment_cnt; /* how many argv[i] are assignments? */
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smallint is_stopped; /* is the command currently running? */
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smallint grp_type; /* GRP_xxx */
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struct pipe *group; /* if non-NULL, this "prog" is {} group,
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* subshell, or a compound statement */
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struct pipe *group; /* if non-NULL, this "command" is { list },
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* ( list ), or a compound statement */
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#if !BB_MMU
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char *group_as_string;
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#endif
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char **argv; /* command name and arguments */
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struct redir_struct *redirects; /* I/O redirections */
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};
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@ -354,6 +404,9 @@ struct parse_context {
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struct command *command;
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/* last redirect in command->redirects list */
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struct redir_struct *pending_redirect;
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#if !BB_MMU
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o_string as_string;
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#endif
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#if HAS_KEYWORDS
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smallint ctx_res_w;
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smallint ctx_inverted; /* "! cmd | cmd" */
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@ -389,45 +442,6 @@ struct variable {
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smallint flg_read_only;
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};
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typedef struct o_string {
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char *data;
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int length; /* position where data is appended */
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int maxlen;
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/* Protect newly added chars against globbing
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* (by prepending \ to *, ?, [, \) */
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smallint o_escape;
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smallint o_glob;
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smallint nonnull;
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smallint has_empty_slot;
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smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
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} o_string;
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enum {
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MAYBE_ASSIGNMENT = 0,
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DEFINITELY_ASSIGNMENT = 1,
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NOT_ASSIGNMENT = 2,
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WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */
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};
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/* Used for initialization: o_string foo = NULL_O_STRING; */
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#define NULL_O_STRING { NULL }
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/* I can almost use ordinary FILE*. Is open_memstream() universally
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* available? Where is it documented? */
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typedef struct in_str {
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const char *p;
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/* eof_flag=1: last char in ->p is really an EOF */
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char eof_flag; /* meaningless if ->p == NULL */
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char peek_buf[2];
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#if ENABLE_HUSH_INTERACTIVE
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smallint promptme;
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smallint promptmode; /* 0: PS1, 1: PS2 */
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#endif
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FILE *file;
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int (*get) (struct in_str *);
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int (*peek) (struct in_str *);
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} in_str;
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#define i_getch(input) ((input)->get(input))
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#define i_peek(input) ((input)->peek(input))
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enum {
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BC_BREAK = 1,
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BC_CONTINUE = 2,
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@ -1359,6 +1373,11 @@ static void o_free(o_string *o)
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memset(o, 0, sizeof(*o));
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}
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static ALWAYS_INLINE void o_free_unsafe(o_string *o)
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{
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free(o->data);
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}
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static void o_grow_by(o_string *o, int len)
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{
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if (o->length + len > o->maxlen) {
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@ -1376,7 +1395,7 @@ static void o_addchr(o_string *o, int ch)
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o->data[o->length] = '\0';
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}
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static void o_addstr(o_string *o, const char *str, int len)
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static void o_addblock(o_string *o, const char *str, int len)
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{
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o_grow_by(o, len);
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memcpy(&o->data[o->length], str, len);
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@ -1384,12 +1403,19 @@ static void o_addstr(o_string *o, const char *str, int len)
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o->data[o->length] = '\0';
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}
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static void o_addstrauto(o_string *o, const char *str)
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#if !BB_MMU
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static void o_addstr(o_string *o, const char *str)
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{
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o_addstr(o, str, strlen(str) + 1);
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o_addblock(o, str, strlen(str));
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}
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#endif
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static void o_addstr_with_NUL(o_string *o, const char *str)
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{
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o_addblock(o, str, strlen(str) + 1);
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}
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static void o_addstr_duplicate_backslash(o_string *o, const char *str, int len)
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static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
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{
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while (len) {
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o_addchr(o, *str);
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@ -1438,7 +1464,7 @@ static void o_addQchr(o_string *o, int ch)
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static void o_addQstr(o_string *o, const char *str, int len)
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{
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if (!o->o_escape) {
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o_addstr(o, str, len);
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o_addblock(o, str, len);
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return;
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}
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while (len) {
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@ -1447,7 +1473,7 @@ static void o_addQstr(o_string *o, const char *str, int len)
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int ordinary_cnt = strcspn(str, "*?[\\");
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if (ordinary_cnt > len) /* paranoia */
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ordinary_cnt = len;
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o_addstr(o, str, ordinary_cnt);
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o_addblock(o, str, ordinary_cnt);
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if (ordinary_cnt == len)
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return;
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str += ordinary_cnt;
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@ -1582,7 +1608,7 @@ static int o_glob(o_string *o, int n)
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char **argv = globdata.gl_pathv;
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o->length = pattern - o->data; /* "forget" pattern */
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while (1) {
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o_addstrauto(o, *argv);
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o_addstr_with_NUL(o, *argv);
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n = o_save_ptr_helper(o, n);
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argv++;
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if (!*argv)
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@ -1635,7 +1661,14 @@ static char **o_finalize_list(o_string *o, int n)
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static int process_command_subs(o_string *dest, const char *s);
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#endif
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static char *expand_string_to_string(const char *str);
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static int parse_stream_dquoted(o_string *dest, struct in_str *input, int dquote_end);
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#if BB_MMU
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#define parse_stream_dquoted(ctx, dest, input, dquote_end) \
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parse_stream_dquoted(dest, input, dquote_end)
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#endif
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static int parse_stream_dquoted(struct parse_context *ctx,
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o_string *dest,
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struct in_str *input,
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int dquote_end);
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/* expand_strvec_to_strvec() takes a list of strings, expands
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* all variable references within and returns a pointer to
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@ -1657,7 +1690,7 @@ static int expand_on_ifs(o_string *output, int n, const char *str)
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if (output->o_escape || !output->o_glob)
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o_addQstr(output, str, word_len);
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else /* protect backslashes against globbing up :) */
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o_addstr_duplicate_backslash(output, str, word_len);
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o_addblock_duplicate_backslash(output, str, word_len);
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str += word_len;
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}
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if (!*str) /* EOL - do not finalize word */
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@ -1701,7 +1734,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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#if ENABLE_SH_MATH_SUPPORT
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char arith_buf[sizeof(arith_t)*3 + 2];
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#endif
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o_addstr(output, arg, p - arg);
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o_addblock(output, arg, p - arg);
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debug_print_list("expand_vars_to_list[1]", output, n);
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arg = ++p;
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p = strchr(p, SPECIAL_VAR_SYMBOL);
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@ -1825,7 +1858,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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o_string dest = NULL_O_STRING;
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setup_string_in_str(&input, arg);
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parse_stream_dquoted(&dest, &input, EOF);
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parse_stream_dquoted(NULL, &dest, &input, EOF);
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//bb_error_msg("'%s' -> '%s'", arg, dest.data);
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exp_str = expand_string_to_string(dest.data);
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//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
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@ -1958,7 +1991,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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debug_print_list("expand_vars_to_list[a]", output, n);
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/* this part is literal, and it was already pre-quoted
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* if needed (much earlier), do not use o_addQstr here! */
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o_addstrauto(output, arg);
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o_addstr_with_NUL(output, arg);
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debug_print_list("expand_vars_to_list[b]", output, n);
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} else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
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&& !(ored_ch & 0x80) /* and all vars were not quoted. */
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@ -2148,6 +2181,10 @@ static void free_pipe(struct pipe *pi, int indent)
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debug_printf_clean("%s end group\n", indenter(indent));
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command->group = NULL;
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}
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#if !BB_MMU
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free(command->group_as_string);
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command->group_as_string = NULL;
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#endif
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for (r = command->redirects; r; r = rnext) {
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debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
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if (r->dup == -1) {
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@ -2215,9 +2252,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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char **argv, int assignment_cnt,
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char **argv_expanded)
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{
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int rcode;
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char **new_env;
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const struct built_in_command *x;
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/* Case when we are here: ... | var=val | ... */
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if (!argv[assignment_cnt])
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@ -2251,12 +2286,17 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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* easier to waste a few CPU cycles than it is to figure out
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* if this is one of those cases.
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*/
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for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
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if (strcmp(argv[0], x->cmd) == 0) {
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debug_printf_exec("running builtin '%s'\n", argv[0]);
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rcode = x->function(argv);
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fflush(NULL);
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_exit(rcode);
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{
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int rcode;
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const struct built_in_command *x;
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for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
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if (strcmp(argv[0], x->cmd) == 0) {
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debug_printf_exec("running builtin '%s'\n",
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argv[0]);
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rcode = x->function(argv);
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fflush(NULL);
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_exit(rcode);
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}
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}
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}
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#endif
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@ -2320,8 +2360,8 @@ static void pseudo_exec(nommu_save_t *nommu_save,
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* since this process is about to exit */
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_exit(rcode);
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#else
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//TODO: re-exec "hush -c command->group_as_a_string"
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bb_error_msg_and_die("nested lists are not supported on NOMMU");
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bb_error_msg_and_die("NOMMU TODO: re-exec '%s'",
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command->group_as_string);
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#endif
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}
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@ -3587,6 +3627,13 @@ static int reserved_word(o_string *word, struct parse_context *ctx)
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old = ctx->stack;
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old->command->group = ctx->list_head;
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old->command->grp_type = GRP_NORMAL;
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#if !BB_MMU
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o_addstr(&old->as_string, ctx->as_string.data);
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o_free_unsafe(&ctx->as_string);
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old->command->group_as_string = xstrdup(old->as_string.data);
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debug_printf_parse("pop, remembering as:'%s'\n",
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old->command->group_as_string);
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#endif
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*ctx = *old; /* physical copy */
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free(old);
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}
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@ -3739,7 +3786,13 @@ static int redirect_opt_num(o_string *o)
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return num;
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}
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static struct pipe *parse_stream(struct in_str *input, int end_trigger);
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#if BB_MMU
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#define parse_stream(pstring, input, end_trigger) \
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parse_stream(input, end_trigger)
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#endif
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static struct pipe *parse_stream(char **pstring,
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struct in_str *input,
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int end_trigger);
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static void parse_and_run_string(const char *s);
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#if ENABLE_HUSH_TICK
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@ -3864,15 +3917,33 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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endch = ')';
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command->grp_type = GRP_SUBSHELL;
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}
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pipe_list = parse_stream(input, endch);
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/* empty ()/{} or parse error? */
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if (!pipe_list || pipe_list == ERR_PTR) {
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syntax(NULL);
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debug_printf_parse("parse_group return 1: "
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"parse_stream returned %p\n", pipe_list);
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return 1;
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{
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#if !BB_MMU
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char *as_string = NULL;
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#endif
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pipe_list = parse_stream(&as_string, input, endch);
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#if !BB_MMU
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if (as_string)
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o_addstr(&ctx->as_string, as_string);
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#endif
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/* empty ()/{} or parse error? */
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if (!pipe_list || pipe_list == ERR_PTR) {
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#if !BB_MMU
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free(as_string);
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#endif
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syntax(NULL);
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debug_printf_parse("parse_group return 1: "
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"parse_stream returned %p\n", pipe_list);
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return 1;
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}
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command->group = pipe_list;
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#if !BB_MMU
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as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
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command->group_as_string = as_string;
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debug_printf_parse("end of group, remembering as:'%s'\n",
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command->group_as_string);
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#endif
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}
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command->group = pipe_list;
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debug_printf_parse("parse_group return 0\n");
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return 0;
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/* command remains "open", available for possible redirects */
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@ -4151,14 +4222,24 @@ static int handle_dollar(o_string *dest, struct in_str *input)
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return 0;
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}
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static int parse_stream_dquoted(o_string *dest,
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struct in_str *input, int dquote_end)
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#if BB_MMU
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#define parse_stream_dquoted(ctx, dest, input, dquote_end) \
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parse_stream_dquoted(dest, input, dquote_end)
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#endif
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static int parse_stream_dquoted(struct parse_context *ctx,
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o_string *dest,
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struct in_str *input,
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int dquote_end)
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{
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int ch;
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int next;
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again:
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx && ch != EOF)
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o_addchr(&ctx->as_string, ch);
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#endif
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if (ch == dquote_end) { /* may be only '"' or EOF */
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dest->nonnull = 1;
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if (dest->o_assignment == NOT_ASSIGNMENT)
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@ -4237,15 +4318,13 @@ static int parse_stream_dquoted(o_string *dest,
|
||||
* reset parsing machinery and start parsing anew,
|
||||
* or return ERR_PTR.
|
||||
*/
|
||||
static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
static struct pipe *parse_stream(char **pstring,
|
||||
struct in_str *input,
|
||||
int end_trigger)
|
||||
{
|
||||
struct parse_context ctx;
|
||||
o_string dest = NULL_O_STRING;
|
||||
int redir_fd;
|
||||
int next;
|
||||
int is_in_dquote;
|
||||
int ch;
|
||||
redir_type redir_style;
|
||||
|
||||
/* Double-quote state is handled in the state variable is_in_dquote.
|
||||
* A single-quote triggers a bypass of the main loop until its mate is
|
||||
@ -4268,15 +4347,18 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
while (1) {
|
||||
const char *is_ifs;
|
||||
const char *is_special;
|
||||
int ch;
|
||||
int next;
|
||||
int redir_fd;
|
||||
redir_type redir_style;
|
||||
|
||||
if (is_in_dquote) {
|
||||
if (parse_stream_dquoted(&dest, input, '"')) {
|
||||
if (parse_stream_dquoted(&ctx, &dest, input, '"')) {
|
||||
goto parse_error;
|
||||
}
|
||||
/* We reached closing '"' */
|
||||
is_in_dquote = 0;
|
||||
}
|
||||
next = '\0';
|
||||
ch = i_getch(input);
|
||||
debug_printf_parse(": ch=%c (%d) escape=%d\n",
|
||||
ch, ch, dest.o_escape);
|
||||
@ -4287,8 +4369,9 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
}
|
||||
o_free(&dest);
|
||||
done_pipe(&ctx, PIPE_SEQ);
|
||||
/* If we got nothing... */
|
||||
pi = ctx.list_head;
|
||||
/* If we got nothing... */
|
||||
// TODO: test script consisting of just "&"
|
||||
if (pi->num_cmds == 0
|
||||
IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
|
||||
) {
|
||||
@ -4296,12 +4379,18 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
pi = NULL;
|
||||
}
|
||||
debug_printf_parse("parse_stream return %p\n", pi);
|
||||
#if !BB_MMU
|
||||
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
||||
if (pstring)
|
||||
*pstring = ctx.as_string.data;
|
||||
else
|
||||
o_free_unsafe(&ctx.as_string);
|
||||
#endif
|
||||
return pi;
|
||||
}
|
||||
if (ch != '\n') {
|
||||
next = i_peek(input);
|
||||
}
|
||||
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
is_ifs = strchr(G.ifs, ch);
|
||||
is_special = strchr("<>;&|(){}#'" /* special outside of "str" */
|
||||
"\\$\"" USE_HUSH_TICK("`") /* always special */
|
||||
@ -4356,6 +4445,13 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
"end_trigger char found\n",
|
||||
ctx.list_head);
|
||||
o_free(&dest);
|
||||
#if !BB_MMU
|
||||
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
||||
if (pstring)
|
||||
*pstring = ctx.as_string.data;
|
||||
else
|
||||
o_free_unsafe(&ctx.as_string);
|
||||
#endif
|
||||
return ctx.list_head;
|
||||
}
|
||||
}
|
||||
@ -4368,6 +4464,11 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
dest.o_assignment = NOT_ASSIGNMENT;
|
||||
}
|
||||
|
||||
next = '\0';
|
||||
if (ch != '\n') {
|
||||
next = i_peek(input);
|
||||
}
|
||||
|
||||
switch (ch) {
|
||||
case '#':
|
||||
if (dest.length == 0) {
|
||||
@ -4601,6 +4702,9 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
debug_print_tree(pctx->list_head, 0);
|
||||
free_pipe_list(pctx->list_head, 0);
|
||||
debug_printf_clean("freed list %p\n", pctx->list_head);
|
||||
#if !BB_MMU
|
||||
o_free_unsafe(&pctx->as_string);
|
||||
#endif
|
||||
IF_HAS_KEYWORDS(p2 = pctx->stack;)
|
||||
if (pctx != &ctx) {
|
||||
free(pctx);
|
||||
@ -4612,8 +4716,13 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
/* If we are not in top-level parse, we return,
|
||||
* our caller will propagate error.
|
||||
*/
|
||||
if (end_trigger != ';')
|
||||
if (end_trigger != ';') {
|
||||
#if !BB_MMU
|
||||
if (pstring)
|
||||
*pstring = NULL;
|
||||
#endif
|
||||
return ERR_PTR;
|
||||
}
|
||||
/* Discard cached input, force prompt */
|
||||
input->p = NULL;
|
||||
USE_HUSH_INTERACTIVE(input->promptme = 1;)
|
||||
@ -4621,7 +4730,7 @@ static struct pipe *parse_stream(struct in_str *input, int end_trigger)
|
||||
}
|
||||
}
|
||||
|
||||
/* Execiting from string: eval, sh -c '...'
|
||||
/* Executing from string: eval, sh -c '...'
|
||||
* or from file: /etc/profile, . file, sh <script>, sh (intereactive)
|
||||
* end_trigger controls how often we stop parsing
|
||||
* NUL: parse all, execute, return
|
||||
@ -4632,7 +4741,7 @@ static void parse_and_run_stream(struct in_str *inp, int end_trigger)
|
||||
while (1) {
|
||||
struct pipe *pipe_list;
|
||||
|
||||
pipe_list = parse_stream(inp, end_trigger);
|
||||
pipe_list = parse_stream(NULL, inp, end_trigger);
|
||||
if (!pipe_list) /* EOF */
|
||||
break;
|
||||
debug_print_tree(pipe_list, 0);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user