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greg |
2.1 |
#ifndef lint |
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greg |
2.9 |
static const char RCSid[] = "$Id: expandarg.c,v 2.8 2003/06/30 14:59:11 schorsch Exp $"; |
3 |
greg |
2.1 |
#endif |
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/* |
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* Get additional command arguments from file or environment. |
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greg |
2.4 |
* |
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greg |
2.7 |
* External symbols declared in rtio.h |
8 |
greg |
2.4 |
*/ |
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10 |
greg |
2.5 |
#include "copyright.h" |
11 |
greg |
2.1 |
|
12 |
schorsch |
2.8 |
#include <errno.h> |
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#include <string.h> |
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greg |
2.7 |
#include "rtio.h" |
16 |
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#include "rtmisc.h" |
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18 |
greg |
2.1 |
|
19 |
greg |
2.9 |
#define MAXARGEXP 4096 /* maximum argument expansion */ |
20 |
greg |
2.1 |
|
21 |
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/* set the following to suit, -1 to disable */ |
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int envexpchr = '$'; /* 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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25 |
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greg |
2.4 |
int |
27 |
greg |
2.1 |
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; |
33 |
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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) |
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 |
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ace = wordfile(ave, (*avp)[n]+1); |
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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 |
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ace = wordstring(ave, getenv((*avp)[n]+1)); |
45 |
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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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} |