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 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 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