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/*
* dvipage: DVI Previewer Program for Suns
*
* Neil Hunt (hunt@spar.slb.com)
*
* This program is based, in part, upon the program dvisun,
* distributed by the UnixTeX group, extensively modified by
* Neil Hunt at the Schlumberger Palo Alto Research Laboratories
* of Schlumberger Technologies, Inc.
*
* Copyright (c) 1988 Schlumberger Technologies, Inc 1988.
* Anyone can use this software in any manner they choose,
* including modification and redistribution, provided they make
* no charge for it, and these conditions remain unchanged.
*
* This program is distributed as is, with all faults (if any), and
* without any warranty. No author or distributor accepts responsibility
* to anyone for the consequences of using it, or for whether it serves any
* particular purpose at all, or any other reason.
*
* $Log: args.c,v $
* Revision 1.1 88/11/28 18:39:09 hunt
* Initial revision
*
* Stripped from dvipage.c 1.4.
*/
#include <stdio.h>
#include <sys/param.h> /* For MAXPATHLEN */
#include <suntool/sunview.h>
#include "dvipage.h"
static char * a_arg_ptr = NULL;
static int a_arg_index = 0;
static bool a_escape_seen;
char * a_prog_name = "Anonymous";
/*
* a_next:
* Returns the next flag in the command line,
* or A_ARG if it is not a flag,
* or A_END if there are no more args.
*/
char
a_next(argc, argv)
int argc;
char **argv;
{
char opt;
/*
* Checks.
*/
if(argv == NULL || argc < 1)
{
fprintf(stderr, "a_next: bad arguments\n");
exit(2);
}
/*
* Get program name on first call.
*/
if(a_arg_index == 0)
{
a_prog_name = argv[0];
a_arg_index = 1;
}
/*
* If there is part of the previous word left, then return it.
*/
if(a_arg_ptr && *a_arg_ptr)
return *a_arg_ptr++;
/*
* Return A_END after the end of the list.
*/
if(a_arg_index >= argc)
return A_END;
/*
* Look at the next word.
*/
a_arg_ptr = argv[a_arg_index++];
/*
* If we have seen the escape "--",
* or if the first char of the word * is not a '-',
* or if this is an isolated "-",
* then return ARG.
*/
if(a_escape_seen || a_arg_ptr[0] != '-' || a_arg_ptr[1] == '\0')
return A_ARG;
/*
* Look at the next char.
*/
a_arg_ptr++;
opt = *a_arg_ptr++;
/*
* If the next char is '-', then this is the escape.
* start over...
*/
if(opt == '-')
{
a_escape_seen = TRUE;
return a_next(argc, argv);
}
/*
* Otherwise, return this option.
*/
return opt;
}
/*
* a_arg:
* Returns the next argument in the command line,
* or NULL if there are no more args.
*/
char *
a_arg(argc, argv)
int argc;
char **argv;
{
char *arg;
/*
* Checks.
*/
if(argv == NULL || argc < 1)
{
fprintf(stderr, "a_arg: bad arguments\n");
exit(2);
}
/*
* Get program name on first call.
*/
if(a_arg_index == 0)
{
a_prog_name = argv[0];
a_arg_index = 1;
}
/*
* If there is part of the previous word left, then return it.
*/
if(a_arg_ptr && *a_arg_ptr)
{
arg = a_arg_ptr;
a_arg_ptr = NULL;
return arg;
}
/*
* Return NULL after the end of the list.
*/
if(a_arg_index >= argc)
return NULL;
/*
* Return the next word.
*/
return argv[a_arg_index++];
}
/*
* a_number:
* Interpret the next word or part word as a number.
*/
double
a_number(argc, argv)
int argc;
char **argv;
{
char *arg;
if((arg = a_arg(argc, argv)) == NULL)
return 0.0;
else
return atof(arg);
}
/*
* a_integer:
* Interpret the next word or part word as an integer.
*/
int
a_integer(argc, argv)
int argc;
char **argv;
{
char *arg;
if((arg = a_arg(argc, argv)) == NULL)
return 0;
else
return atoi(arg);
}
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