hush: improve parse_stream: does not require parsing context struct;
cleans up on syntax errors (we used to leak memory in this case); much simplified interface to the rest of hush. function old new delta parse_stream 1204 1447 +243 done_word 658 669 +11 static_get 22 28 +6 builtin_source 84 89 +5 parse_and_run_file 27 30 +3 parse_and_run_string 31 27 -4 builtin_eval 55 50 -5 hush_main 991 985 -6 free_pipe_list 39 31 -8 free_pipe 210 189 -21 expand_variables 2242 2199 -43 parse_and_run_stream 289 153 -136 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 5/7 up/down: 268/-223) Total: 45 bytes
This commit is contained in:
Denis Vlasenko
parent
240c255d8b
commit
b6e6556b31
486
shell/hush.c
486
shell/hush.c
@ -217,24 +217,24 @@ void xxfree(void *ptr);
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void *xxmalloc(int lineno, size_t size)
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{
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void *ptr = xmalloc((size + 0xff) & ~0xff);
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fprintf(stderr, "line %d: malloc %p\n", lineno, ptr);
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fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
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return ptr;
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}
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void *xxrealloc(int lineno, void *ptr, size_t size)
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{
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ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
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fprintf(stderr, "line %d: realloc %p\n", lineno, ptr);
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fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
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return ptr;
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}
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char *xxstrdup(int lineno, const char *str)
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{
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char *ptr = xstrdup(str);
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fprintf(stderr, "line %d: strdup %p\n", lineno, ptr);
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fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
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return ptr;
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}
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void xxfree(void *ptr)
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{
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fprintf(stderr, "free %p\n", ptr);
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fdprintf(2, "free %p\n", ptr);
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free(ptr);
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}
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#define xmalloc(s) xxmalloc(__LINE__, s)
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@ -244,12 +244,13 @@ void xxfree(void *ptr)
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#endif
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#define ERR_PTR ((void*)(long)1)
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static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
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#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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#define SPECIAL_VAR_SYMBOL 3
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#define PARSEFLAG_EXIT_FROM_LOOP 1
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typedef enum redir_type {
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REDIRECT_INPUT = 1,
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@ -1209,8 +1210,10 @@ static void arith_set_local_var(const char *name, const char *val, int flags)
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static int static_get(struct in_str *i)
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{
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int ch = *i->p++;
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if (ch == '\0') return EOF;
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if (ch != '\0')
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return ch;
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i->p--;
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return EOF;
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}
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static int static_peek(struct in_str *i)
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@ -2147,18 +2150,18 @@ static void restore_redirects(int squirrel[])
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#define free_pipe_list(head, indent) free_pipe_list(head)
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#define free_pipe(pi, indent) free_pipe(pi)
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#endif
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static int free_pipe_list(struct pipe *head, int indent);
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static void free_pipe_list(struct pipe *head, int indent);
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/* return code is the exit status of the pipe */
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static int free_pipe(struct pipe *pi, int indent)
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static void free_pipe(struct pipe *pi, int indent)
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{
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char **p;
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struct command *command;
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struct redir_struct *r, *rnext;
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int a, i, ret_code = 0;
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int a, i;
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if (pi->stopped_cmds > 0)
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return ret_code;
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return;
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debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
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for (i = 0; i < pi->num_cmds; i++) {
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command = &pi->cmds[i];
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@ -2169,12 +2172,13 @@ static int free_pipe(struct pipe *pi, int indent)
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}
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free_strings(command->argv);
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command->argv = NULL;
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} else if (command->group) {
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}
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/* not "else if": on syntax error, we may have both! */
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if (command->group) {
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debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
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ret_code = free_pipe_list(command->group, indent+3);
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free_pipe_list(command->group, indent+3);
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debug_printf_clean("%s end group\n", indenter(indent));
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} else {
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debug_printf_clean("%s (nil)\n", indenter(indent));
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command->group = NULL;
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}
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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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@ -2199,25 +2203,22 @@ static int free_pipe(struct pipe *pi, int indent)
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free(pi->cmdtext);
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pi->cmdtext = NULL;
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#endif
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return ret_code;
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}
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static int free_pipe_list(struct pipe *head, int indent)
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static void free_pipe_list(struct pipe *head, int indent)
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{
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int rcode = 0; /* if list has no members */
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struct pipe *pi, *next;
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for (pi = head; pi; pi = next) {
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#if HAS_KEYWORDS
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debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
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#endif
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rcode = free_pipe(pi, indent);
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free_pipe(pi, indent);
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debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
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next = pi->next;
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/*pi->next = NULL;*/
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free(pi);
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}
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return rcode;
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}
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@ -3412,7 +3413,6 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
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new_p = new_pipe();
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ctx->pipe->next = new_p;
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ctx->pipe = new_p;
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ctx->command = NULL; /* needed! */
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/* RES_THEN, RES_DO etc are "sticky" -
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* they remain set for commands inside if/while.
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* This is used to control execution.
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@ -3428,6 +3428,7 @@ static void done_pipe(struct parse_context *ctx, pipe_style type)
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if (ctx->ctx_res_w == RES_MATCH)
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ctx->ctx_res_w = RES_CASEI;
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#endif
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ctx->command = NULL; /* trick done_command below */
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/* Create the memory for command, roughly:
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* ctx->pipe->cmds = new struct command;
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* ctx->command = &ctx->pipe->cmds[0];
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@ -3542,21 +3543,21 @@ static int reserved_word(o_string *word, struct parse_context *ctx)
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#endif
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if (r->flag == 0) { /* '!' */
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if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
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syntax(NULL);
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syntax("! ! command");
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IF_HAS_KEYWORDS(ctx->ctx_res_w = RES_SNTX;)
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}
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ctx->ctx_inverted = 1;
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return 1;
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}
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if (r->flag & FLAG_START) {
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struct parse_context *new;
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debug_printf("push stack\n");
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new = xmalloc(sizeof(*new));
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*new = *ctx; /* physical copy */
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struct parse_context *old;
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old = xmalloc(sizeof(*old));
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debug_printf_parse("push stack %p\n", old);
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*old = *ctx; /* physical copy */
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initialize_context(ctx);
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ctx->stack = new;
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ctx->stack = old;
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} else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
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syntax(NULL);
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syntax(word->data);
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ctx->ctx_res_w = RES_SNTX;
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return 1;
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}
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@ -3564,8 +3565,8 @@ static int reserved_word(o_string *word, struct parse_context *ctx)
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ctx->old_flag = r->flag;
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if (ctx->old_flag & FLAG_END) {
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struct parse_context *old;
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debug_printf("pop stack\n");
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done_pipe(ctx, PIPE_SEQ);
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debug_printf_parse("pop stack %p\n", ctx->stack);
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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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@ -3577,10 +3578,10 @@ static int reserved_word(o_string *word, struct parse_context *ctx)
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}
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#endif
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//TODO: many, many callers don't check error from done_word()
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/* Word is complete, look at it and update parsing context.
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* Normal return is 0. Syntax errors return 1. */
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* Normal return is 0. Syntax errors return 1.
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* Note: on return, word is reset, but not o_free'd!
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*/
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static int done_word(o_string *word, struct parse_context *ctx)
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{
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struct command *command = ctx->command;
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@ -3610,10 +3611,14 @@ static int done_word(o_string *word, struct parse_context *ctx)
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debug_printf("word stored in rd_filename: '%s'\n", word->data);
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} else {
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/* "{ echo foo; } echo bar" - bad */
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/* NB: bash allows e.g. "if true; then { echo foo; } fi". TODO? */
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/* NB: bash allows e.g.:
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* if true; then { echo foo; } fi
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* while if false; then false; fi do break; done
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* TODO? */
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if (command->group) {
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syntax(NULL);
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debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
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syntax(word->data);
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debug_printf_parse("done_word return 1: syntax error, "
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"groups and arglists don't mix\n");
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return 1;
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}
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#if HAS_KEYWORDS
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@ -3716,8 +3721,7 @@ static int redirect_opt_num(o_string *o)
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return num;
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}
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static int parse_stream(o_string *dest, struct parse_context *ctx,
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struct in_str *input0, int end_trigger);
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static struct pipe *parse_stream(struct in_str *input, int end_trigger);
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#if ENABLE_HUSH_TICK
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static FILE *generate_stream_from_list(struct pipe *head)
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@ -3767,24 +3771,25 @@ static int process_command_subs(o_string *dest,
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struct in_str *input)
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{
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int retcode, ch, eol_cnt;
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o_string result = NULL_O_STRING;
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struct parse_context inner;
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struct pipe *pipe_list;
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FILE *p;
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struct in_str pipe_str;
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/* Recursion to generate command */
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retcode = parse_stream(&result, &inner, input, '\0');
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if (retcode != 0)
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return retcode; /* syntax error or EOF */
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o_free(&result);
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pipe_list = parse_stream(input, '\0');
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if (pipe_list == NULL)
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return 0; /* EOF: empty `cmd`: ``, ` ` etc */
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if (pipe_list == ERR_PTR)
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return 1; /* parse error. can this really happen? */
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p = generate_stream_from_list(inner.list_head);
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p = generate_stream_from_list(pipe_list);
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free_pipe_list(pipe_list, /* indent: */ 0);
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if (p == NULL)
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return 1;
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close_on_exec_on(fileno(p));
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setup_file_in_str(&pipe_str, p);
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/* Now send results of command back into original context */
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setup_file_in_str(&pipe_str, p);
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eol_cnt = 0;
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while ((ch = i_getch(&pipe_str)) != EOF) {
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if (ch == '\n') {
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@ -3805,7 +3810,6 @@ static int process_command_subs(o_string *dest,
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* echo `echo Hi; exec 1>&-; sleep 2`
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*/
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retcode = fclose(p);
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free_pipe_list(inner.list_head, /* indent: */ 0);
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debug_printf("closed FILE from child, retcode=%d\n", retcode);
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return retcode;
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}
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@ -3817,9 +3821,8 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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/* dest contains characters seen prior to ( or {.
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* Typically it's empty, but for function defs,
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* it contains function name (without '()'). */
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int rcode;
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struct pipe *pipe_list;
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int endch;
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struct parse_context sub;
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struct command *command = ctx->command;
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debug_printf_parse("parse_group entered\n");
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@ -3845,12 +3848,16 @@ 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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rcode = parse_stream(dest, &sub, input, endch);
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if (rcode == 0) {
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command->group = sub.list_head;
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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: parse_stream returned %p\n", pipe_list);
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return 1;
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}
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debug_printf_parse("parse_group return %d\n", rcode);
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return rcode;
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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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}
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@ -4211,17 +4218,18 @@ static int parse_stream_dquoted(o_string *dest, struct in_str *input, int dquote
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goto again;
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}
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/* Initalize ctx (i.e. caller does not need to do that).
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* Scan input, call done_word() whenever full IFS delimited word was seen.
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* Call done_pipe if '\n' was seen (and end_trigger != NULL).
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* Return code is 0 if end_trigger char is met,
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* -1 on EOF (but if end_trigger == NULL then return 0),
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* 1 for syntax error
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* Net result is a list of pipes in ctx->list_head.
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/*
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* Scan input until EOF or end_trigger char.
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* Return a list of pipes to execute, or NULL on EOF
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* or if end_trigger character is met.
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* On syntax error, exit is shell is not interactive,
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* reset parsing machinery and start parsing anew,
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* or return ERR_PTR.
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*/
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static int parse_stream(o_string *dest, struct parse_context *ctx,
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struct in_str *input, int end_trigger)
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static struct pipe *parse_stream(struct in_str *input, int end_trigger)
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{
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struct parse_context ctx;
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o_string dest = NULL_O_STRING;
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int ch, m;
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int redir_fd;
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redir_type redir_style;
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@ -4232,18 +4240,22 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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* A single-quote triggers a bypass of the main loop until its mate is
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* found. When recursing, quote state is passed in via dest->o_escape. */
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debug_printf_parse("parse_stream entered, end_trigger='%c' "
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"dest->o_assignment:%d\n", end_trigger ? : 'X'
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, dest->o_assignment);
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debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
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end_trigger ? : 'X');
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dest->o_assignment = MAYBE_ASSIGNMENT;
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initialize_context(ctx);
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is_in_dquote = dest->o_escape;
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reset:
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#if ENABLE_HUSH_INTERACTIVE
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input->promptmode = 0; /* PS1 */
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#endif
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/* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */
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initialize_context(&ctx);
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is_in_dquote = 0;
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while (1) {
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if (is_in_dquote) {
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if (parse_stream_dquoted(dest, input, '"'))
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return 1; /* propagate parse error */
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/* If we're here, we reached closing '"' */
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if (parse_stream_dquoted(&dest, input, '"')) {
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goto parse_error;
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}
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/* We reached closing '"' */
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is_in_dquote = 0;
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}
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m = CHAR_IFS;
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@ -4256,15 +4268,15 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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}
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}
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debug_printf_parse(": ch=%c (%d) m=%d escape=%d\n",
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ch, ch, m, dest->o_escape);
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ch, ch, m, dest.o_escape);
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if (m == CHAR_ORDINARY) {
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o_addQchr(dest, ch);
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if ((dest->o_assignment == MAYBE_ASSIGNMENT
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|| dest->o_assignment == WORD_IS_KEYWORD)
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o_addQchr(&dest, ch);
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if ((dest.o_assignment == MAYBE_ASSIGNMENT
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|| dest.o_assignment == WORD_IS_KEYWORD)
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&& ch == '='
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&& is_assignment(dest->data)
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&& is_assignment(dest.data)
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) {
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dest->o_assignment = DEFINITELY_ASSIGNMENT;
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dest.o_assignment = DEFINITELY_ASSIGNMENT;
|
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}
|
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continue;
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}
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@ -4272,25 +4284,40 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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/* m is SPECIAL ($,`), IFS, or ORDINARY_IF_QUOTED (*,#) */
|
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|
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if (m == CHAR_IFS) {
|
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if (ch == EOF)
|
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goto ret_EOF;
|
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if (done_word(dest, ctx)) {
|
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debug_printf_parse("parse_stream return 1: done_word!=0\n");
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return 1;
|
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if (ch == EOF) {
|
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struct pipe *pi;
|
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if (done_word(&dest, &ctx)) {
|
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goto parse_error;
|
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}
|
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o_free(&dest);
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done_pipe(&ctx, PIPE_SEQ);
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/* If we got nothing... */
|
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pi = ctx.list_head;
|
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if (pi->num_cmds == 0
|
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&& pi->res_word == RES_NONE
|
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) {
|
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free_pipe_list(pi, 0);
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pi = NULL;
|
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}
|
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debug_printf_parse("parse_stream return %p\n", pi);
|
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return pi;
|
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}
|
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if (done_word(&dest, &ctx)) {
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goto parse_error;
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}
|
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if (ch == '\n') {
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#if ENABLE_HUSH_CASE
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/* "case ... in <newline> word) ..." -
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* newlines are ignored (but ';' wouldn't be) */
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if (ctx->command->argv == NULL
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&& ctx->ctx_res_w == RES_MATCH
|
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if (ctx.command->argv == NULL
|
||||
&& ctx.ctx_res_w == RES_MATCH
|
||||
) {
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
/* Treat newline as a command separator. */
|
||||
done_pipe(ctx, PIPE_SEQ);
|
||||
dest->o_assignment = MAYBE_ASSIGNMENT;
|
||||
done_pipe(&ctx, PIPE_SEQ);
|
||||
dest.o_assignment = MAYBE_ASSIGNMENT;
|
||||
ch = ';';
|
||||
/* note: if (m == CHAR_IFS) continue;
|
||||
* will still trigger for us */
|
||||
@ -4298,15 +4325,20 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
}
|
||||
if (end_trigger && end_trigger == ch) {
|
||||
//TODO: disallow "{ cmd }" without semicolon
|
||||
done_word(dest, ctx);
|
||||
done_pipe(ctx, PIPE_SEQ);
|
||||
dest->o_assignment = MAYBE_ASSIGNMENT;
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
done_pipe(&ctx, PIPE_SEQ);
|
||||
dest.o_assignment = MAYBE_ASSIGNMENT;
|
||||
/* Do we sit outside of any if's, loops or case's? */
|
||||
if (!HAS_KEYWORDS
|
||||
IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0))
|
||||
IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
|
||||
) {
|
||||
debug_printf_parse("parse_stream return 0: end_trigger char found\n");
|
||||
return 0;
|
||||
debug_printf_parse("parse_stream return %p: "
|
||||
"end_trigger char found\n",
|
||||
ctx.list_head);
|
||||
o_free(&dest);
|
||||
return ctx.list_head;
|
||||
}
|
||||
}
|
||||
if (m == CHAR_IFS)
|
||||
@ -4314,15 +4346,15 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
|
||||
/* m is SPECIAL (e.g. $,`) or ORDINARY_IF_QUOTED (*,#) */
|
||||
|
||||
if (dest->o_assignment == MAYBE_ASSIGNMENT) {
|
||||
if (dest.o_assignment == MAYBE_ASSIGNMENT) {
|
||||
/* ch is a special char and thus this word
|
||||
* cannot be an assignment */
|
||||
dest->o_assignment = NOT_ASSIGNMENT;
|
||||
dest.o_assignment = NOT_ASSIGNMENT;
|
||||
}
|
||||
|
||||
switch (ch) {
|
||||
case '#':
|
||||
if (dest->length == 0) {
|
||||
if (dest.length == 0) {
|
||||
while (1) {
|
||||
ch = i_peek(input);
|
||||
if (ch == EOF || ch == '\n')
|
||||
@ -4330,61 +4362,61 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
i_getch(input);
|
||||
}
|
||||
} else {
|
||||
o_addQchr(dest, ch);
|
||||
o_addQchr(&dest, ch);
|
||||
}
|
||||
break;
|
||||
case '\\':
|
||||
if (next == EOF) {
|
||||
syntax("\\<eof>");
|
||||
debug_printf_parse("parse_stream return 1: \\<eof>\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
}
|
||||
o_addchr(dest, '\\');
|
||||
o_addchr(dest, i_getch(input));
|
||||
o_addchr(&dest, '\\');
|
||||
o_addchr(&dest, i_getch(input));
|
||||
break;
|
||||
case '$':
|
||||
if (handle_dollar(dest, input) != 0) {
|
||||
debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n");
|
||||
return 1;
|
||||
if (handle_dollar(&dest, input) != 0) {
|
||||
debug_printf_parse("parse_stream parse error: handle_dollar returned non-0\n");
|
||||
goto parse_error;
|
||||
}
|
||||
break;
|
||||
case '\'':
|
||||
dest->nonnull = 1;
|
||||
dest.nonnull = 1;
|
||||
while (1) {
|
||||
ch = i_getch(input);
|
||||
if (ch == EOF) {
|
||||
syntax("unterminated '");
|
||||
debug_printf_parse("parse_stream return 1: unterminated '\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
}
|
||||
if (ch == '\'')
|
||||
break;
|
||||
if (dest->o_assignment == NOT_ASSIGNMENT)
|
||||
o_addqchr(dest, ch);
|
||||
if (dest.o_assignment == NOT_ASSIGNMENT)
|
||||
o_addqchr(&dest, ch);
|
||||
else
|
||||
o_addchr(dest, ch);
|
||||
o_addchr(&dest, ch);
|
||||
}
|
||||
break;
|
||||
case '"':
|
||||
dest->nonnull = 1;
|
||||
dest.nonnull = 1;
|
||||
is_in_dquote ^= 1; /* invert */
|
||||
if (dest->o_assignment == NOT_ASSIGNMENT)
|
||||
dest->o_escape ^= 1;
|
||||
if (dest.o_assignment == NOT_ASSIGNMENT)
|
||||
dest.o_escape ^= 1;
|
||||
break;
|
||||
#if ENABLE_HUSH_TICK
|
||||
case '`': {
|
||||
//int pos = dest->length;
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
o_addchr(dest, '`');
|
||||
add_till_backquote(dest, input);
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
|
||||
//int pos = dest.length;
|
||||
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
||||
o_addchr(&dest, '`');
|
||||
add_till_backquote(&dest, input);
|
||||
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
||||
//debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
case '>':
|
||||
redir_fd = redirect_opt_num(dest);
|
||||
done_word(dest, ctx);
|
||||
redir_fd = redirect_opt_num(&dest);
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
redir_style = REDIRECT_OVERWRITE;
|
||||
if (next == '>') {
|
||||
redir_style = REDIRECT_APPEND;
|
||||
@ -4393,15 +4425,16 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
#if 0
|
||||
else if (next == '(') {
|
||||
syntax(">(process) not supported");
|
||||
debug_printf_parse("parse_stream return 1: >(process) not supported\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
}
|
||||
#endif
|
||||
setup_redirect(ctx, redir_fd, redir_style, input);
|
||||
setup_redirect(&ctx, redir_fd, redir_style, input);
|
||||
break;
|
||||
case '<':
|
||||
redir_fd = redirect_opt_num(dest);
|
||||
done_word(dest, ctx);
|
||||
redir_fd = redirect_opt_num(&dest);
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
redir_style = REDIRECT_INPUT;
|
||||
if (next == '<') {
|
||||
redir_style = REDIRECT_HEREIS;
|
||||
@ -4413,18 +4446,19 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
#if 0
|
||||
else if (next == '(') {
|
||||
syntax("<(process) not supported");
|
||||
debug_printf_parse("parse_stream return 1: <(process) not supported\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
}
|
||||
#endif
|
||||
setup_redirect(ctx, redir_fd, redir_style, input);
|
||||
setup_redirect(&ctx, redir_fd, redir_style, input);
|
||||
break;
|
||||
case ';':
|
||||
#if ENABLE_HUSH_CASE
|
||||
case_semi:
|
||||
#endif
|
||||
done_word(dest, ctx);
|
||||
done_pipe(ctx, PIPE_SEQ);
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
done_pipe(&ctx, PIPE_SEQ);
|
||||
#if ENABLE_HUSH_CASE
|
||||
/* Eat multiple semicolons, detect
|
||||
* whether it means something special */
|
||||
@ -4433,9 +4467,9 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
if (ch != ';')
|
||||
break;
|
||||
i_getch(input);
|
||||
if (ctx->ctx_res_w == RES_CASEI) {
|
||||
ctx->ctx_dsemicolon = 1;
|
||||
ctx->ctx_res_w = RES_MATCH;
|
||||
if (ctx.ctx_res_w == RES_CASEI) {
|
||||
ctx.ctx_dsemicolon = 1;
|
||||
ctx.ctx_res_w = RES_MATCH;
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -4443,51 +4477,55 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
new_cmd:
|
||||
/* We just finished a cmd. New one may start
|
||||
* with an assignment */
|
||||
dest->o_assignment = MAYBE_ASSIGNMENT;
|
||||
dest.o_assignment = MAYBE_ASSIGNMENT;
|
||||
break;
|
||||
case '&':
|
||||
done_word(dest, ctx);
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
if (next == '&') {
|
||||
i_getch(input);
|
||||
done_pipe(ctx, PIPE_AND);
|
||||
done_pipe(&ctx, PIPE_AND);
|
||||
} else {
|
||||
done_pipe(ctx, PIPE_BG);
|
||||
done_pipe(&ctx, PIPE_BG);
|
||||
}
|
||||
goto new_cmd;
|
||||
case '|':
|
||||
done_word(dest, ctx);
|
||||
if (done_word(&dest, &ctx)) {
|
||||
goto parse_error;
|
||||
}
|
||||
#if ENABLE_HUSH_CASE
|
||||
if (ctx->ctx_res_w == RES_MATCH)
|
||||
if (ctx.ctx_res_w == RES_MATCH)
|
||||
break; /* we are in case's "word | word)" */
|
||||
#endif
|
||||
if (next == '|') { /* || */
|
||||
i_getch(input);
|
||||
done_pipe(ctx, PIPE_OR);
|
||||
done_pipe(&ctx, PIPE_OR);
|
||||
} else {
|
||||
/* we could pick up a file descriptor choice here
|
||||
* with redirect_opt_num(), but bash doesn't do it.
|
||||
* "echo foo 2| cat" yields "foo 2". */
|
||||
done_command(ctx);
|
||||
done_command(&ctx);
|
||||
}
|
||||
goto new_cmd;
|
||||
case '(':
|
||||
#if ENABLE_HUSH_CASE
|
||||
/* "case... in [(]word)..." - skip '(' */
|
||||
if (ctx->ctx_res_w == RES_MATCH
|
||||
&& ctx->command->argv == NULL /* not (word|(... */
|
||||
&& dest->length == 0 /* not word(... */
|
||||
&& dest->nonnull == 0 /* not ""(... */
|
||||
if (ctx.ctx_res_w == RES_MATCH
|
||||
&& ctx.command->argv == NULL /* not (word|(... */
|
||||
&& dest.length == 0 /* not word(... */
|
||||
&& dest.nonnull == 0 /* not ""(... */
|
||||
) {
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
#if ENABLE_HUSH_FUNCTIONS
|
||||
if (dest->length != 0 /* not just () but word() */
|
||||
&& dest->nonnull == 0 /* not a"b"c() */
|
||||
&& ctx->command->argv == NULL /* it's the first word */
|
||||
if (dest.length != 0 /* not just () but word() */
|
||||
&& dest.nonnull == 0 /* not a"b"c() */
|
||||
&& ctx.command->argv == NULL /* it's the first word */
|
||||
//TODO: "func ( ) {...}" - note spaces - is valid format too in bash
|
||||
&& i_peek(input) == ')'
|
||||
&& !match_reserved_word(dest)
|
||||
&& !match_reserved_word(&dest)
|
||||
) {
|
||||
bb_error_msg("seems like a function definition");
|
||||
i_getch(input);
|
||||
@ -4497,21 +4535,19 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
} while (ch == ' ' || ch == '\n');
|
||||
if (ch != '{') {
|
||||
syntax("was expecting {");
|
||||
debug_printf_parse("parse_stream return 1\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
}
|
||||
ch = 'F'; /* magic value */
|
||||
}
|
||||
#endif
|
||||
case '{':
|
||||
if (parse_group(dest, ctx, input, ch) != 0) {
|
||||
debug_printf_parse("parse_stream return 1: parse_group returned non-0\n");
|
||||
return 1;
|
||||
if (parse_group(&dest, &ctx, input, ch) != 0) {
|
||||
goto parse_error;
|
||||
}
|
||||
goto new_cmd;
|
||||
case ')':
|
||||
#if ENABLE_HUSH_CASE
|
||||
if (ctx->ctx_res_w == RES_MATCH)
|
||||
if (ctx.ctx_res_w == RES_MATCH)
|
||||
goto case_semi;
|
||||
#endif
|
||||
case '}':
|
||||
@ -4519,23 +4555,51 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
|
||||
* if we see {, we call parse_group(..., end_trigger='}')
|
||||
* and it will match } earlier (not here). */
|
||||
syntax("unexpected } or )");
|
||||
debug_printf_parse("parse_stream return 1: unexpected '}'\n");
|
||||
return 1;
|
||||
goto parse_error;
|
||||
default:
|
||||
if (HUSH_DEBUG)
|
||||
bb_error_msg_and_die("BUG: unexpected %c\n", ch);
|
||||
}
|
||||
} /* while (1) */
|
||||
|
||||
/* Non-error returns */
|
||||
ret_EOF:
|
||||
debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL));
|
||||
done_word(dest, ctx);
|
||||
done_pipe(ctx, PIPE_SEQ);
|
||||
if (end_trigger) {
|
||||
return -1; /* EOF found while expecting end_trigger */
|
||||
parse_error:
|
||||
{
|
||||
struct parse_context *pctx, *p2;
|
||||
|
||||
/* Clean up allocated tree.
|
||||
* Samples for finding leaks on syntax error recovery path.
|
||||
* Execute them from interactive shell and watch pmap `pidof hush`.
|
||||
* while if false; then false; fi do break; done (bash accepts it)
|
||||
* while if false; then false; fi; do break; fi
|
||||
*/
|
||||
pctx = &ctx;
|
||||
do {
|
||||
/* Update pipe/command counts,
|
||||
* otherwise freeing may miss some */
|
||||
done_pipe(pctx, PIPE_SEQ);
|
||||
debug_printf_clean("freeing list %p from ctx %p\n",
|
||||
pctx->list_head, pctx);
|
||||
debug_print_tree(pctx->list_head, 0);
|
||||
free_pipe_list(pctx->list_head, 0);
|
||||
debug_printf_clean("freed list %p\n", pctx->list_head);
|
||||
p2 = pctx->stack;
|
||||
if (pctx != &ctx) {
|
||||
free(pctx);
|
||||
}
|
||||
pctx = p2;
|
||||
} while (pctx);
|
||||
/* Free text, clear all dest fields */
|
||||
o_free(&dest);
|
||||
/* If we are not in top-level parse, we return,
|
||||
* our caller will propagate error.
|
||||
*/
|
||||
if (end_trigger != ';')
|
||||
return ERR_PTR;
|
||||
/* Discard cached input, force prompt */
|
||||
input->p = NULL;
|
||||
input->promptme = 1;
|
||||
goto reset;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void set_in_charmap(const char *set, int code)
|
||||
@ -4565,71 +4629,41 @@ static void update_charmap(void)
|
||||
set_in_charmap(G.ifs, CHAR_IFS); /* are ordinary if quoted */
|
||||
}
|
||||
|
||||
/* Most recursion does not come through here, the exception is
|
||||
* from builtin_source() and builtin_eval() */
|
||||
static int parse_and_run_stream(struct in_str *inp, int parse_flag)
|
||||
/* Execiting 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
|
||||
* ';': parse till ';' or newline, execute, repeat till EOF
|
||||
*/
|
||||
static void parse_and_run_stream(struct in_str *inp, int end_trigger)
|
||||
{
|
||||
struct parse_context ctx;
|
||||
o_string temp = NULL_O_STRING;
|
||||
int rcode;
|
||||
while (1) {
|
||||
struct pipe *pipe_list;
|
||||
|
||||
do {
|
||||
update_charmap();
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
inp->promptmode = 0; /* PS1 */
|
||||
#endif
|
||||
/* We will stop & execute after each ';' or '\n'.
|
||||
* Example: "sleep 9999; echo TEST" + ctrl-C:
|
||||
* TEST should be printed */
|
||||
temp.o_assignment = MAYBE_ASSIGNMENT;
|
||||
rcode = parse_stream(&temp, &ctx, inp, ';');
|
||||
debug_printf_parse("rcode %d ctx.old_flag %x\n", rcode, ctx.old_flag);
|
||||
#if HAS_KEYWORDS
|
||||
if (rcode != 1 && ctx.old_flag != 0) {
|
||||
syntax(NULL);
|
||||
}
|
||||
#endif
|
||||
if (rcode != 1 IF_HAS_KEYWORDS(&& ctx.old_flag == 0)) {
|
||||
debug_print_tree(ctx.list_head, 0);
|
||||
|
||||
pipe_list = parse_stream(inp, end_trigger);
|
||||
if (!pipe_list) /* EOF */
|
||||
break;
|
||||
debug_print_tree(pipe_list, 0);
|
||||
debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
|
||||
run_and_free_list(ctx.list_head);
|
||||
} else {
|
||||
/* We arrive here also if rcode == 1 (error in parse_stream) */
|
||||
#if HAS_KEYWORDS
|
||||
if (ctx.old_flag != 0) {
|
||||
free(ctx.stack);
|
||||
o_reset(&temp);
|
||||
run_and_free_list(pipe_list);
|
||||
/* Loop on syntax errors, return on EOF: */
|
||||
}
|
||||
#endif
|
||||
/*temp.nonnull = 0; - o_free does it below */
|
||||
/*temp.o_escape = 0; - o_free does it below */
|
||||
free_pipe_list(ctx.list_head, /* indent: */ 0);
|
||||
/* Discard all unprocessed line input, force prompt on */
|
||||
inp->p = NULL;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
inp->promptme = 1;
|
||||
#endif
|
||||
}
|
||||
o_free(&temp);
|
||||
/* loop on syntax errors, return on EOF: */
|
||||
} while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int parse_and_run_string(const char *s, int parse_flag)
|
||||
static void parse_and_run_string(const char *s)
|
||||
{
|
||||
struct in_str input;
|
||||
setup_string_in_str(&input, s);
|
||||
return parse_and_run_stream(&input, parse_flag);
|
||||
parse_and_run_stream(&input, '\0');
|
||||
}
|
||||
|
||||
static int parse_and_run_file(FILE *f)
|
||||
static void parse_and_run_file(FILE *f)
|
||||
{
|
||||
int rcode;
|
||||
struct in_str input;
|
||||
setup_file_in_str(&input, f);
|
||||
rcode = parse_and_run_stream(&input, 0 /* parse_flag */);
|
||||
return rcode;
|
||||
parse_and_run_stream(&input, ';');
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_JOB
|
||||
@ -4753,7 +4787,7 @@ int hush_main(int argc, char **argv)
|
||||
optind--;
|
||||
} /* else -c 'script' PAR0 PAR1: $0 is PAR0 */
|
||||
G.global_argc = argc - optind;
|
||||
opt = parse_and_run_string(optarg, 0 /* parse_flag */);
|
||||
parse_and_run_string(optarg);
|
||||
goto final_return;
|
||||
case 'i':
|
||||
/* Well, we cannot just declare interactiveness,
|
||||
@ -4851,14 +4885,14 @@ int hush_main(int argc, char **argv)
|
||||
#endif
|
||||
|
||||
if (argv[optind] == NULL) {
|
||||
opt = parse_and_run_file(stdin);
|
||||
parse_and_run_file(stdin);
|
||||
} else {
|
||||
debug_printf("\nrunning script '%s'\n", argv[optind]);
|
||||
G.global_argv = argv + optind;
|
||||
G.global_argc = argc - optind;
|
||||
input = xfopen_for_read(argv[optind]);
|
||||
fcntl(fileno(input), F_SETFD, FD_CLOEXEC);
|
||||
opt = parse_and_run_file(input);
|
||||
parse_and_run_file(input);
|
||||
}
|
||||
|
||||
final_return:
|
||||
@ -4876,7 +4910,7 @@ int hush_main(int argc, char **argv)
|
||||
free(tmp);
|
||||
}
|
||||
#endif
|
||||
hush_exit(opt ? opt : G.last_return_code);
|
||||
hush_exit(G.last_return_code);
|
||||
}
|
||||
|
||||
|
||||
@ -5000,7 +5034,11 @@ static int builtin_eval(char **argv)
|
||||
|
||||
if (argv[1]) {
|
||||
char *str = expand_strvec_to_string(argv + 1);
|
||||
parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP);
|
||||
/* bash:
|
||||
* eval "echo Hi; done" ("done" is syntax error):
|
||||
* "echo Hi" will not execute too.
|
||||
*/
|
||||
parse_and_run_string(str);
|
||||
free(str);
|
||||
rcode = G.last_return_code;
|
||||
}
|
||||
@ -5011,8 +5049,9 @@ static int builtin_cd(char **argv)
|
||||
{
|
||||
const char *newdir;
|
||||
if (argv[1] == NULL) {
|
||||
// bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
||||
// bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
|
||||
/* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
||||
* bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
|
||||
*/
|
||||
newdir = getenv("HOME") ? : "/";
|
||||
} else
|
||||
newdir = argv[1];
|
||||
@ -5309,7 +5348,6 @@ static int builtin_shift(char **argv)
|
||||
static int builtin_source(char **argv)
|
||||
{
|
||||
FILE *input;
|
||||
int status;
|
||||
|
||||
if (argv[1] == NULL)
|
||||
return EXIT_FAILURE;
|
||||
@ -5326,9 +5364,9 @@ static int builtin_source(char **argv)
|
||||
/* XXX argv and argc are broken; need to save old G.global_argv
|
||||
* (pointer only is OK!) on this stack frame,
|
||||
* set G.global_argv=argv+1, recurse, and restore. */
|
||||
status = parse_and_run_file(input);
|
||||
parse_and_run_file(input);
|
||||
fclose(input);
|
||||
return status;
|
||||
return G.last_return_code;
|
||||
}
|
||||
|
||||
static int builtin_umask(char **argv)
|
||||
|
||||
@ -1,2 +1,2 @@
|
||||
bash 3.2 fails this
|
||||
hush: syntax error
|
||||
hush: syntax error: ! ! command
|
||||
|
||||
Loading…
Reference in New Issue
Block a user