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+ BASH PATCH REPORT
+ =================
+
+Bash-Release: 4.2
+Patch-ID: bash42-012
+
+Bug-Reported-by: Rui Santos <rsantos@grupopie.com>
+Bug-Reference-ID: <4E04C6D0.2020507@grupopie.com>
+Bug-Reference-URL: http://lists.gnu.org/archive/html/bug-bash/2011-06/msg00079.html
+
+Bug-Description:
+
+When calling the parser to recursively parse a command substitution within
+an arithmetic expansion, the shell overwrote the saved shell input line and
+associated state, resulting in a garbled command.
+
+Patch (apply with `patch -p0'):
+
+*** ../bash-4.2-patched/parse.y 2011-02-26 19:19:05.000000000 -0500
+--- parse.y 2011-06-24 20:08:22.000000000 -0400
+***************
+*** 3843,3846 ****
+--- 3849,3853 ----
+ {
+ sh_parser_state_t ps;
++ sh_input_line_state_t ls;
+ int orig_ind, nc, sflags;
+ char *ret, *s, *ep, *ostring;
+***************
+*** 3850,3857 ****
+--- 3857,3866 ----
+ ostring = string;
+
++ /*itrace("xparse_dolparen: size = %d shell_input_line = `%s'", shell_input_line_size, shell_input_line);*/
+ sflags = SEVAL_NONINT|SEVAL_NOHIST|SEVAL_NOFREE;
+ if (flags & SX_NOLONGJMP)
+ sflags |= SEVAL_NOLONGJMP;
+ save_parser_state (&ps);
++ save_input_line_state (&ls);
+
+ /*(*/
+***************
+*** 3862,3865 ****
+--- 3871,3876 ----
+ restore_parser_state (&ps);
+ reset_parser ();
++ /* reset_parser clears shell_input_line and associated variables */
++ restore_input_line_state (&ls);
+ if (interactive)
+ token_to_read = 0;
+***************
+*** 5909,5912 ****
+--- 5920,5929 ----
+ ps->echo_input_at_read = echo_input_at_read;
+
++ ps->token = token;
++ ps->token_buffer_size = token_buffer_size;
++ /* Force reallocation on next call to read_token_word */
++ token = 0;
++ token_buffer_size = 0;
++
+ return (ps);
+ }
+***************
+*** 5950,5953 ****
+--- 5967,6006 ----
+ expand_aliases = ps->expand_aliases;
+ echo_input_at_read = ps->echo_input_at_read;
++
++ FREE (token);
++ token = ps->token;
++ token_buffer_size = ps->token_buffer_size;
++ }
++
++ sh_input_line_state_t *
++ save_input_line_state (ls)
++ sh_input_line_state_t *ls;
++ {
++ if (ls == 0)
++ ls = (sh_input_line_state_t *)xmalloc (sizeof (sh_input_line_state_t));
++ if (ls == 0)
++ return ((sh_input_line_state_t *)NULL);
++
++ ls->input_line = shell_input_line;
++ ls->input_line_size = shell_input_line_size;
++ ls->input_line_len = shell_input_line_len;
++ ls->input_line_index = shell_input_line_index;
++
++ /* force reallocation */
++ shell_input_line = 0;
++ shell_input_line_size = shell_input_line_len = shell_input_line_index = 0;
++ }
++
++ void
++ restore_input_line_state (ls)
++ sh_input_line_state_t *ls;
++ {
++ FREE (shell_input_line);
++ shell_input_line = ls->input_line;
++ shell_input_line_size = ls->input_line_size;
++ shell_input_line_len = ls->input_line_len;
++ shell_input_line_index = ls->input_line_index;
++
++ set_line_mbstate ();
+ }
+
+*** ../bash-4.2-patched/shell.h 2011-01-06 22:16:55.000000000 -0500
+--- shell.h 2011-06-24 19:12:25.000000000 -0400
+***************
+*** 137,140 ****
+--- 139,145 ----
+ int *token_state;
+
++ char *token;
++ int token_buffer_size;
++
+ /* input line state -- line number saved elsewhere */
+ int input_line_terminator;
+***************
+*** 167,171 ****
+--- 172,186 ----
+ } sh_parser_state_t;
+
++ typedef struct _sh_input_line_state_t {
++ char *input_line;
++ int input_line_index;
++ int input_line_size;
++ int input_line_len;
++ } sh_input_line_state_t;
++
+ /* Let's try declaring these here. */
+ extern sh_parser_state_t *save_parser_state __P((sh_parser_state_t *));
+ extern void restore_parser_state __P((sh_parser_state_t *));
++
++ extern sh_input_line_state_t *save_input_line_state __P((sh_input_line_state_t *));
++ extern void restore_input_line_state __P((sh_input_line_state_t *));
+*** ../bash-4.2-patched/patchlevel.h Sat Jun 12 20:14:48 2010
+--- patchlevel.h Thu Feb 24 21:41:34 2011
+***************
+*** 26,30 ****
+ looks for to find the patch level (for the sccs version string). */
+
+! #define PATCHLEVEL 11
+
+ #endif /* _PATCHLEVEL_H_ */
+--- 26,30 ----
+ looks for to find the patch level (for the sccs version string). */
+
+! #define PATCHLEVEL 12
+
+ #endif /* _PATCHLEVEL_H_ */