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#ifndef lint |
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static const char RCSid[] = "$Id: expandarg.c,v 2.10 2016/03/21 19:06:08 greg Exp $"; |
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#endif |
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/* |
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* Get additional command arguments from file or environment. |
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* |
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* External symbols declared in rtio.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <errno.h> |
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|
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#include "rtio.h" |
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#include "rtmisc.h" |
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|
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|
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#define MAXARGEXP 4096 /* maximum argument expansion */ |
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|
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/* set the following to suit, -1 to disable */ |
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int envexpchr = '$'; /* environment expansion character */ |
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int filexpchr = '@'; /* file expansion character */ |
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|
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|
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int |
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expandarg( /* expand list at argument n */ |
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int *acp, |
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char ***avp, |
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int n |
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) |
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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, MAXARGEXP, (*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, MAXARGEXP, 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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memcpy((void *)newav, (void *)*avp, n*sizeof(char *)); |
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/* copy expanded argument */ |
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memcpy((void *)(newav+n), (void *)ave, ace*sizeof(char *)); |
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/* copy trailing arguments + NULL */ |
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memcpy((void *)(newav+n+ace), (void *)(*avp+n+1), (*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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} |
