1/* Copyright (c) 1985 Ceriel J.H. Jacobs */
 2
 3#include "in_all.h"
 4#include "options.h"
 5#include "output.h"
 6#include "display.h"
 7#include <ctype.h>
 8
 9int cflag;
10int uflag;
11int nflag;
12int qflag;
13char *startcomm;
14
15static int parsopt(char *s);
16
17/*
18 * Read the options. Return the argv pointer following them if there were
19 * no errors, otherwise return 0.
20 */
21
22char **
23readoptions(char **argv)
24{
25
26	char **av = argv + 1;
27	char *p;
28
29	if ((p = getenv("YAP")) != 0) {
30		(void)parsopt(p);
31	}
32	while (*av && **av == '-') {
33		if (parsopt(*av)) {
34			/*
35			 * Error in option
36			 */
37			putline(*av);
38			putline(": illegal option\n");
39			return (char **)0;
40		}
41		av++;
42	}
43	if (*av && **av == '+') {
44		/*
45		 * Command in command line
46		 */
47		startcomm = *av + 1;
48		av++;
49	}
50	return av;
51}
52
53static int
54parsopt(char *s)
55{
56	int i;
57
58	if (*s == '-')
59		s++;
60	if (isdigit(*s)) {
61		/*
62		 * pagesize option
63		 */
64		i = 0;
65		do {
66			i = i * 10 + *s++ - '0';
67		} while (isdigit(*s));
68		if (i < MINPAGESIZE)
69			i = MINPAGESIZE;
70		pagesize = i;
71	}
72	while (*s) {
73		switch (*s++) {
74		case 'c':
75			cflag++;
76			break;
77		case 'n':
78			nflag++;
79			break;
80		case 'u':
81			uflag++;
82			break;
83		case 'q':
84			qflag++;
85			break;
86		default:
87			return 1;
88		}
89	}
90	return 0;
91}