1 This file is break.def, from which is created break.c.
2 It implements the builtins "break" and "continue" in Bash.
4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 1, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 $FUNCTION break_builtin
27 Exit from within a FOR, WHILE or UNTIL loop. If N is specified,
33 extern char *this_command_name;
35 static int check_loop_level ();
37 /* The depth of while's and until's. */
40 /* Non-zero when a "break" instruction is encountered. */
43 /* Non-zero when we have encountered a continue instruction. */
46 /* Set up to break x levels, where x defaults to 1, but can be specified
47 as the first argument. */
53 if (!check_loop_level ())
54 return (EXECUTION_FAILURE);
56 newbreak = get_numeric_arg (list);
59 return (EXECUTION_FAILURE);
61 if (newbreak > loop_level)
62 newbreak = loop_level;
66 return (EXECUTION_SUCCESS);
70 $FUNCTION continue_builtin
71 $SHORT_DOC continue [n]
72 Resume the next iteration of the enclosing FOR, WHILE or UNTIL loop.
73 If N is specified, resume at the N-th enclosing loop.
76 /* Set up to continue x levels, where x defaults to 1, but can be specified
77 as the first argument. */
78 continue_builtin (list)
83 if (!check_loop_level ())
84 return (EXECUTION_FAILURE);
86 newcont = get_numeric_arg (list);
89 return (EXECUTION_FAILURE);
91 if (newcont > loop_level)
96 return (EXECUTION_SUCCESS);
99 /* Return non-zero if a break or continue command would be okay.
100 Print an error message if break or continue is meaningless here. */
104 #if defined (BREAK_COMPLAINS)
106 builtin_error ("Only meaningful in a `for', `while', or `until' loop");
107 #endif /* BREAK_COMPLAINS */