| 1 |
greg |
2.1 |
#ifndef lint
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| 2 |
greg |
2.10 |
static const char RCSid[] = "$Id: expandarg.c,v 2.9 2008/05/17 02:49:41 greg Exp $";
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| 3 |
greg |
2.1 |
#endif
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| 4 |
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/*
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| 5 |
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* Get additional command arguments from file or environment.
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| 6 |
greg |
2.4 |
*
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| 7 |
greg |
2.7 |
* External symbols declared in rtio.h
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| 8 |
greg |
2.4 |
*/
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| 9 |
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| 10 |
greg |
2.5 |
#include "copyright.h"
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| 11 |
greg |
2.1 |
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| 12 |
schorsch |
2.8 |
#include <errno.h>
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| 13 |
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#include <string.h>
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| 14 |
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| 15 |
greg |
2.7 |
#include "rtio.h"
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| 16 |
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#include "rtmisc.h"
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| 17 |
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| 18 |
greg |
2.1 |
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| 19 |
greg |
2.9 |
#define MAXARGEXP 4096 /* maximum argument expansion */
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| 20 |
greg |
2.1 |
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| 21 |
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/* set the following to suit, -1 to disable */
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| 22 |
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int envexpchr = '$'; /* environment expansion character */
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| 23 |
greg |
2.3 |
int filexpchr = '@'; /* file expansion character */
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| 24 |
greg |
2.1 |
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| 25 |
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| 26 |
greg |
2.4 |
int
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| 27 |
greg |
2.10 |
expandarg( /* expand list at argument n */
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| 28 |
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int *acp,
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| 29 |
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char ***avp,
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| 30 |
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int n
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| 31 |
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)
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| 32 |
greg |
2.1 |
{
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| 33 |
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int ace;
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| 34 |
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char *ave[MAXARGEXP];
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| 35 |
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char **newav;
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| 36 |
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/* check argument */
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| 37 |
greg |
2.2 |
if (n >= *acp)
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| 38 |
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return(0);
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| 39 |
greg |
2.1 |
errno = 0;
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| 40 |
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if ((*avp)[n][0] == filexpchr) { /* file name */
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| 41 |
greg |
2.10 |
ace = wordfile(ave, MAXARGEXP, (*avp)[n]+1);
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| 42 |
greg |
2.1 |
if (ace < 0)
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| 43 |
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return(-1); /* no such file */
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| 44 |
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} else if ((*avp)[n][0] == envexpchr) { /* env. variable */
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| 45 |
greg |
2.10 |
ace = wordstring(ave, MAXARGEXP, getenv((*avp)[n]+1));
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| 46 |
greg |
2.1 |
if (ace < 0)
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| 47 |
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return(-1); /* no such variable */
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| 48 |
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} else /* regular argument */
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| 49 |
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return(0);
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| 50 |
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/* allocate new pointer list */
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| 51 |
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newav = (char **)bmalloc((*acp+ace)*sizeof(char *));
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| 52 |
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if (newav == NULL)
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| 53 |
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return(-1);
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| 54 |
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/* copy preceeding arguments */
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| 55 |
schorsch |
2.8 |
memcpy((void *)newav, (void *)*avp, n*sizeof(char *));
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| 56 |
greg |
2.1 |
/* copy expanded argument */
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| 57 |
schorsch |
2.8 |
memcpy((void *)(newav+n), (void *)ave, ace*sizeof(char *));
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| 58 |
greg |
2.1 |
/* copy trailing arguments + NULL */
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| 59 |
schorsch |
2.8 |
memcpy((void *)(newav+n+ace), (void *)(*avp+n+1), (*acp-n)*sizeof(char *));
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| 60 |
greg |
2.1 |
/* free old list */
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| 61 |
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bfree((char *)*avp, (*acp+1)*sizeof(char *));
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| 62 |
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/* assign new list */
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| 63 |
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*acp += ace-1;
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| 64 |
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*avp = newav;
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| 65 |
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return(1); /* return success */
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| 66 |
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}
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