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,
32 #if defined (HAVE_UNISTD_H)
39 extern char *this_command_name;
41 static int check_loop_level ();
43 /* The depth of while's and until's. */
46 /* Non-zero when a "break" instruction is encountered. */
49 /* Non-zero when we have encountered a continue instruction. */
52 /* Set up to break x levels, where x defaults to 1, but can be specified
53 as the first argument. */
60 if (check_loop_level () == 0)
61 return (EXECUTION_FAILURE);
63 newbreak = get_numeric_arg (list, 1);
67 builtin_error ("loop count must be > 0");
68 breaking = loop_level;
69 return (EXECUTION_FAILURE);
72 if (newbreak > loop_level)
73 newbreak = loop_level;
77 return (EXECUTION_SUCCESS);
81 $FUNCTION continue_builtin
82 $SHORT_DOC continue [n]
83 Resume the next iteration of the enclosing FOR, WHILE or UNTIL loop.
84 If N is specified, resume at the N-th enclosing loop.
87 /* Set up to continue x levels, where x defaults to 1, but can be specified
88 as the first argument. */
90 continue_builtin (list)
95 if (check_loop_level () == 0)
96 return (EXECUTION_FAILURE);
98 newcont = get_numeric_arg (list, 1);
102 builtin_error ("loop count must be > 0");
103 breaking = loop_level;
104 return (EXECUTION_FAILURE);
107 if (newcont > loop_level)
108 newcont = loop_level;
110 continuing = newcont;
112 return (EXECUTION_SUCCESS);
115 /* Return non-zero if a break or continue command would be okay.
116 Print an error message if break or continue is meaningless here. */
120 #if defined (BREAK_COMPLAINS)
122 builtin_error ("only meaningful in a `for', `while', or `until' loop");
123 #endif /* BREAK_COMPLAINS */