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#ifndef lint
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static const char RCSid[] = "$Id: expandarg.c,v 2.6 2003/05/13 17:58:32 greg Exp $";
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#endif
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/*
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* Get additional command arguments from file or environment.
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*
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* External symbols declared in rtio.h
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*/
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#include "copyright.h"
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#include "rtio.h"
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#include "rtmisc.h"
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#include <errno.h>
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#define MAXARGEXP 512 /* maximum argument expansion */
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/* set the following to suit, -1 to disable */
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int envexpchr = '$'; /* environment expansion character */
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int filexpchr = '@'; /* file expansion character */
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int
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expandarg(acp, avp, n) /* expand list at argument n */
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int *acp;
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register char ***avp;
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int n;
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{
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int ace;
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char *ave[MAXARGEXP];
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char **newav;
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/* check argument */
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if (n >= *acp)
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return(0);
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errno = 0;
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if ((*avp)[n][0] == filexpchr) { /* file name */
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ace = wordfile(ave, (*avp)[n]+1);
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if (ace < 0)
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return(-1); /* no such file */
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} else if ((*avp)[n][0] == envexpchr) { /* env. variable */
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ace = wordstring(ave, getenv((*avp)[n]+1));
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if (ace < 0)
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return(-1); /* no such variable */
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} else /* regular argument */
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return(0);
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/* allocate new pointer list */
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newav = (char **)bmalloc((*acp+ace)*sizeof(char *));
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if (newav == NULL)
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return(-1);
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/* copy preceeding arguments */
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bcopy((void *)*avp, (void *)newav, n*sizeof(char *));
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/* copy expanded argument */
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bcopy((void *)ave, (void *)(newav+n), ace*sizeof(char *));
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/* copy trailing arguments + NULL */
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bcopy((void *)(*avp+n+1), (void *)(newav+n+ace), (*acp-n)*sizeof(char *));
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/* free old list */
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bfree((char *)*avp, (*acp+1)*sizeof(char *));
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/* assign new list */
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*acp += ace-1;
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*avp = newav;
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return(1); /* return success */
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}
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