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greg |
2.1 |
#ifndef lint |
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greg |
2.7 |
static const char RCSid[] = "$Id: expandarg.c,v 2.6 2003/05/13 17:58:32 greg Exp $"; |
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greg |
2.1 |
#endif |
| 4 |
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/* |
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* Get additional command arguments from file or environment. |
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greg |
2.4 |
* |
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greg |
2.7 |
* External symbols declared in rtio.h |
| 8 |
greg |
2.4 |
*/ |
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| 10 |
greg |
2.5 |
#include "copyright.h" |
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greg |
2.1 |
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greg |
2.7 |
#include "rtio.h" |
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#include "rtmisc.h" |
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| 16 |
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#include <errno.h> |
| 17 |
greg |
2.1 |
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#define MAXARGEXP 512 /* maximum argument expansion */ |
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| 20 |
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/* set the following to suit, -1 to disable */ |
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int envexpchr = '$'; /* environment expansion character */ |
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greg |
2.3 |
int filexpchr = '@'; /* file expansion character */ |
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greg |
2.1 |
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greg |
2.4 |
int |
| 26 |
greg |
2.1 |
expandarg(acp, avp, n) /* expand list at argument n */ |
| 27 |
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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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greg |
2.2 |
if (n >= *acp) |
| 36 |
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return(0); |
| 37 |
greg |
2.1 |
errno = 0; |
| 38 |
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if ((*avp)[n][0] == filexpchr) { /* file name */ |
| 39 |
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ace = wordfile(ave, (*avp)[n]+1); |
| 40 |
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if (ace < 0) |
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return(-1); /* no such file */ |
| 42 |
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} else if ((*avp)[n][0] == envexpchr) { /* env. variable */ |
| 43 |
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ace = wordstring(ave, getenv((*avp)[n]+1)); |
| 44 |
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if (ace < 0) |
| 45 |
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return(-1); /* no such variable */ |
| 46 |
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} else /* regular argument */ |
| 47 |
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return(0); |
| 48 |
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/* allocate new pointer list */ |
| 49 |
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newav = (char **)bmalloc((*acp+ace)*sizeof(char *)); |
| 50 |
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if (newav == NULL) |
| 51 |
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return(-1); |
| 52 |
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/* copy preceeding arguments */ |
| 53 |
greg |
2.6 |
bcopy((void *)*avp, (void *)newav, n*sizeof(char *)); |
| 54 |
greg |
2.1 |
/* copy expanded argument */ |
| 55 |
greg |
2.6 |
bcopy((void *)ave, (void *)(newav+n), ace*sizeof(char *)); |
| 56 |
greg |
2.1 |
/* copy trailing arguments + NULL */ |
| 57 |
greg |
2.6 |
bcopy((void *)(*avp+n+1), (void *)(newav+n+ace), (*acp-n)*sizeof(char *)); |
| 58 |
greg |
2.1 |
/* free old list */ |
| 59 |
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bfree((char *)*avp, (*acp+1)*sizeof(char *)); |
| 60 |
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/* assign new list */ |
| 61 |
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*acp += ace-1; |
| 62 |
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*avp = newav; |
| 63 |
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return(1); /* return success */ |
| 64 |
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} |
