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cflow.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1982-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * break [n]
 * continue [n]
 * return [n]
 * exit [n]
 *
 *   David Korn
 *   AT&T Labs
 *   dgk@research.att.com
 *
 */

#include    "defs.h"
#include    <ast.h>
#include    <error.h>
#include    <ctype.h>
#include    "shnodes.h"
#include    "builtins.h"

/*
 * return and exit
 */
#if 0
    /* for the dictionary generator */
    int     b_exit(int n, register char *argv[],void *extra){}
#endif
int   b_return(register int n, register char *argv[],void *extra)
{
      register char *arg;
      register Shell_t *shp = (Shell_t*)extra;
      struct checkpt *pp = (struct checkpt*)shp->jmplist;
      const char *options = (**argv=='r'?sh_optreturn:sh_optexit);
      while((n = optget(argv,options))) switch(n)
      {
          case ':':
            if(!strmatch(argv[opt_info.index],"[+-]+([0-9])"))
                  errormsg(SH_DICT,2, "%s", opt_info.arg);
            goto done;
          case '?':
            errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg);
            return(2);
      }
done:
      if(error_info.errors)
            errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
      pp->mode = (**argv=='e'?SH_JMPEXIT:SH_JMPFUN);
      argv += opt_info.index;
      n = (((arg= *argv)?(int)strtol(arg, (char**)0, 10):shp->oldexit)&SH_EXITMASK);
      /* return outside of function, dotscript and profile is exit */
      if(shp->fn_depth==0 && shp->dot_depth==0 && !sh_isstate(SH_PROFILE))
            pp->mode = SH_JMPEXIT;
      sh_exit(shp->savexit=n);
      return(1);
}


/*
 * break and continue
 */
#if 0
    /* for the dictionary generator */
    int     b_continue(int n, register char *argv[],void *extra){}
#endif
int   b_break(register int n, register char *argv[],void *extra)
{
      char *arg;
      register int cont= **argv=='c';
      register Shell_t *shp = (Shell_t*)extra;
      while((n = optget(argv,cont?sh_optcont:sh_optbreak))) switch(n)
      {
          case ':':
            errormsg(SH_DICT,2, "%s", opt_info.arg);
            break;
          case '?':
            errormsg(SH_DICT,ERROR_usage(0), "%s", opt_info.arg);
            return(2);
      }
      if(error_info.errors)
            errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
      argv += opt_info.index;
      n=1;
      if(arg= *argv)
      {
            n = strtol(arg,&arg,10);
            if(n<=0 || *arg)
                  errormsg(SH_DICT,ERROR_exit(1),e_nolabels,*argv);
      }
      if(shp->st.loopcnt)
      {
            shp->st.execbrk = shp->st.breakcnt = n;
            if(shp->st.breakcnt > shp->st.loopcnt)
                  shp->st.breakcnt = shp->st.loopcnt;
            if(cont)
                  shp->st.breakcnt = -shp->st.breakcnt;
      }
      return(0);
}


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