1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1982-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * David Korn <dgk@research.att.com> *
18 * *
19 ***********************************************************************/
20 #pragma prototyped
21 /*
22 * break [n]
23 * continue [n]
24 * return [n]
25 * exit [n]
26 *
27 * David Korn
28 * AT&T Labs
29 * dgk@research.att.com
30 *
31 */
32
33 #include "defs.h"
34 #include <ast.h>
35 #include <error.h>
36 #include "shnodes.h"
37 #include "builtins.h"
38
39 /*
40 * return and exit
41 */
42 #if 0
43 /* for the dictionary generator */
44 int b_exit(int n, register char *argv[],void *extra){}
45 #endif
b_return(register int n,register char * argv[],void * extra)46 int b_return(register int n, register char *argv[],void *extra)
47 {
48 register char *arg;
49 register Shell_t *shp = ((Shbltin_t*)extra)->shp;
50 struct checkpt *pp = (struct checkpt*)shp->jmplist;
51 const char *options = (**argv=='r'?sh_optreturn:sh_optexit);
52 while((n = optget(argv,options))) switch(n)
53 {
54 case ':':
55 if(!strmatch(argv[opt_info.index],"[+-]+([0-9])"))
56 errormsg(SH_DICT,2, "%s", opt_info.arg);
57 goto done;
58 case '?':
59 errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg);
60 return(2);
61 }
62 done:
63 if(error_info.errors)
64 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
65 pp->mode = (**argv=='e'?SH_JMPEXIT:SH_JMPFUN);
66 argv += opt_info.index;
67 n = (((arg= *argv)?(int)strtol(arg, (char**)0, 10)&SH_EXITMASK:shp->oldexit));
68 /* return outside of function, dotscript and profile is exit */
69 if(shp->fn_depth==0 && shp->dot_depth==0 && !sh_isstate(SH_PROFILE))
70 pp->mode = SH_JMPEXIT;
71 sh_exit(shp->savexit=n);
72 return(1);
73 }
74
75
76 /*
77 * break and continue
78 */
79 #if 0
80 /* for the dictionary generator */
81 int b_continue(int n, register char *argv[],void *extra){}
82 #endif
b_break(register int n,register char * argv[],void * extra)83 int b_break(register int n, register char *argv[],void *extra)
84 {
85 char *arg;
86 register int cont= **argv=='c';
87 register Shell_t *shp = ((Shbltin_t*)extra)->shp;
88 while((n = optget(argv,cont?sh_optcont:sh_optbreak))) switch(n)
89 {
90 case ':':
91 errormsg(SH_DICT,2, "%s", opt_info.arg);
92 break;
93 case '?':
94 errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg);
95 return(2);
96 }
97 if(error_info.errors)
98 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
99 argv += opt_info.index;
100 n=1;
101 if(arg= *argv)
102 {
103 n = strtol(arg,&arg,10);
104 if(n<=0 || *arg)
105 errormsg(SH_DICT,ERROR_exit(1),e_nolabels,*argv);
106 }
107 if(shp->st.loopcnt)
108 {
109 shp->st.execbrk = shp->st.breakcnt = n;
110 if(shp->st.breakcnt > shp->st.loopcnt)
111 shp->st.breakcnt = shp->st.loopcnt;
112 if(cont)
113 shp->st.breakcnt = -shp->st.breakcnt;
114 }
115 return(0);
116 }
117
118