95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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* args.c --
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*
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* Procedures to assist in command-line argument processing.
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*
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* *********************************************************************
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* * Copyright (C) 1985, 1990 Regents of the University of California. *
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* * Permission to use, copy, modify, and distribute this *
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* * software and its documentation for any purpose and without *
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* * fee is hereby granted, provided that the above copyright *
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* * notice appear in all copies. The University of California *
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* * makes no representations about the suitability of this *
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* * software for any purpose. It is provided "as is" without *
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* * express or implied warranty. Export of this software outside *
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* * of the United States of America may require an export license. *
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* *********************************************************************
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*/
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#ifndef lint
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static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/utils/args.c,v 1.1.1.1 2008/02/03 20:43:50 tim Exp $";
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#endif /* not lint */
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#include <stdio.h>
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#include <ctype.h>
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#include "utils/magic.h"
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#include "utils/utils.h"
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/* C99 compat */
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#include "textio/textio.h"
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/*
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* ----------------------------------------------------------------------------
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*
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* ArgStr --
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*
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* Process a single argument that is supposed to have a string value.
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* A string argument can appear in three ways:
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*
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* -avalue (a single element of argv)
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* -a value (two elements of argv)
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* "-a value" (a single element of argv, space-separated)
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*
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* All three forms are recognized.
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*
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* Results:
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* Returns a pointer to the value, or NULL if there wasn't one.
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*
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* Side effects:
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* Complains if there was no value.
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* Leaves *pargc and *pargv updated if the string was in the
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* next element of argv.
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*
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* ----------------------------------------------------------------------------
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*/
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char *
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ArgStr(
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int *pargc,
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char ***pargv,
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const char *argType) /* For error messages: what the following
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* string is supposed to be interpreted as.
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*/
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{
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char **argv = *pargv;
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char *result;
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char *argptr;
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argptr = argv[0];
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argptr++;
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if (*argptr == '\0')
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{
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TxError("Bad argument %s\n", argv[0]);
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return NULL;
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}
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argptr++;
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if (*argptr != '\0')
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{
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while (isspace(*argptr) && (*argptr != '\0'))
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argptr++;
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return argptr;
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}
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if ((*pargc)-- > 0)
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{
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result = *++argv;
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*pargv = argv;
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return (result);
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}
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TxError("-%c requires a following %s\n", argv[0][1], argType);
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return NULL;
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}
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