| 1 |
greg |
2.1 |
#ifndef lint |
| 2 |
greg |
2.11 |
static const char RCSid[] = "$Id: expandarg.c,v 2.10 2016/03/21 19:06:08 greg Exp $"; |
| 3 |
greg |
2.1 |
#endif |
| 4 |
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/* |
| 5 |
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* Get additional command arguments from file or environment. |
| 6 |
greg |
2.4 |
* |
| 7 |
greg |
2.7 |
* External symbols declared in rtio.h |
| 8 |
greg |
2.4 |
*/ |
| 9 |
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| 10 |
greg |
2.5 |
#include "copyright.h" |
| 11 |
greg |
2.1 |
|
| 12 |
schorsch |
2.8 |
#include <errno.h> |
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| 14 |
greg |
2.7 |
#include "rtio.h" |
| 15 |
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#include "rtmisc.h" |
| 16 |
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| 17 |
greg |
2.1 |
|
| 18 |
greg |
2.9 |
#define MAXARGEXP 4096 /* maximum argument expansion */ |
| 19 |
greg |
2.1 |
|
| 20 |
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/* set the following to suit, -1 to disable */ |
| 21 |
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int envexpchr = '$'; /* environment expansion character */ |
| 22 |
greg |
2.3 |
int filexpchr = '@'; /* file expansion character */ |
| 23 |
greg |
2.1 |
|
| 24 |
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| 25 |
greg |
2.4 |
int |
| 26 |
greg |
2.10 |
expandarg( /* expand list at argument n */ |
| 27 |
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int *acp, |
| 28 |
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char ***avp, |
| 29 |
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int n |
| 30 |
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) |
| 31 |
greg |
2.1 |
{ |
| 32 |
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int ace; |
| 33 |
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char *ave[MAXARGEXP]; |
| 34 |
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char **newav; |
| 35 |
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/* check argument */ |
| 36 |
greg |
2.2 |
if (n >= *acp) |
| 37 |
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return(0); |
| 38 |
greg |
2.1 |
errno = 0; |
| 39 |
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if ((*avp)[n][0] == filexpchr) { /* file name */ |
| 40 |
greg |
2.10 |
ace = wordfile(ave, MAXARGEXP, (*avp)[n]+1); |
| 41 |
greg |
2.1 |
if (ace < 0) |
| 42 |
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return(-1); /* no such file */ |
| 43 |
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} else if ((*avp)[n][0] == envexpchr) { /* env. variable */ |
| 44 |
greg |
2.10 |
ace = wordstring(ave, MAXARGEXP, getenv((*avp)[n]+1)); |
| 45 |
greg |
2.1 |
if (ace < 0) |
| 46 |
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return(-1); /* no such variable */ |
| 47 |
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} else /* regular argument */ |
| 48 |
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return(0); |
| 49 |
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/* allocate new pointer list */ |
| 50 |
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newav = (char **)bmalloc((*acp+ace)*sizeof(char *)); |
| 51 |
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if (newav == NULL) |
| 52 |
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return(-1); |
| 53 |
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/* copy preceeding arguments */ |
| 54 |
schorsch |
2.8 |
memcpy((void *)newav, (void *)*avp, n*sizeof(char *)); |
| 55 |
greg |
2.1 |
/* copy expanded argument */ |
| 56 |
schorsch |
2.8 |
memcpy((void *)(newav+n), (void *)ave, ace*sizeof(char *)); |
| 57 |
greg |
2.1 |
/* copy trailing arguments + NULL */ |
| 58 |
schorsch |
2.8 |
memcpy((void *)(newav+n+ace), (void *)(*avp+n+1), (*acp-n)*sizeof(char *)); |
| 59 |
greg |
2.1 |
/* free old list */ |
| 60 |
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bfree((char *)*avp, (*acp+1)*sizeof(char *)); |
| 61 |
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/* assign new list */ |
| 62 |
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*acp += ace-1; |
| 63 |
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*avp = newav; |
| 64 |
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return(1); /* return success */ |
| 65 |
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} |
