1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1982-2008 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 <ctype.h> 37 #include "shnodes.h" 38 #include "builtins.h" 39 40 /* 41 * return and exit 42 */ 43 #if 0 44 /* for the dictionary generator */ 45 int b_exit(int n, register char *argv[],void *extra){} 46 #endif 47 int b_return(register int n, register char *argv[],void *extra) 48 { 49 register char *arg; 50 register Shell_t *shp = ((Shbltin_t*)extra)->shp; 51 struct checkpt *pp = (struct checkpt*)shp->jmplist; 52 const char *options = (**argv=='r'?sh_optreturn:sh_optexit); 53 while((n = optget(argv,options))) switch(n) 54 { 55 case ':': 56 if(!strmatch(argv[opt_info.index],"[+-]+([0-9])")) 57 errormsg(SH_DICT,2, "%s", opt_info.arg); 58 goto done; 59 case '?': 60 errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg); 61 return(2); 62 } 63 done: 64 if(error_info.errors) 65 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0)); 66 pp->mode = (**argv=='e'?SH_JMPEXIT:SH_JMPFUN); 67 argv += opt_info.index; 68 n = (((arg= *argv)?(int)strtol(arg, (char**)0, 10):shp->oldexit)&SH_EXITMASK); 69 /* return outside of function, dotscript and profile is exit */ 70 if(shp->fn_depth==0 && shp->dot_depth==0 && !sh_isstate(SH_PROFILE)) 71 pp->mode = SH_JMPEXIT; 72 sh_exit(shp->savexit=n); 73 return(1); 74 } 75 76 77 /* 78 * break and continue 79 */ 80 #if 0 81 /* for the dictionary generator */ 82 int b_continue(int n, register char *argv[],void *extra){} 83 #endif 84 int b_break(register int n, register char *argv[],void *extra) 85 { 86 char *arg; 87 register int cont= **argv=='c'; 88 register Shell_t *shp = ((Shbltin_t*)extra)->shp; 89 while((n = optget(argv,cont?sh_optcont:sh_optbreak))) switch(n) 90 { 91 case ':': 92 errormsg(SH_DICT,2, "%s", opt_info.arg); 93 break; 94 case '?': 95 errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg); 96 return(2); 97 } 98 if(error_info.errors) 99 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0)); 100 argv += opt_info.index; 101 n=1; 102 if(arg= *argv) 103 { 104 n = strtol(arg,&arg,10); 105 if(n<=0 || *arg) 106 errormsg(SH_DICT,ERROR_exit(1),e_nolabels,*argv); 107 } 108 if(shp->st.loopcnt) 109 { 110 shp->st.execbrk = shp->st.breakcnt = n; 111 if(shp->st.breakcnt > shp->st.loopcnt) 112 shp->st.breakcnt = shp->st.loopcnt; 113 if(cont) 114 shp->st.breakcnt = -shp->st.breakcnt; 115 } 116 return(0); 117 } 118 119