1/* Copyright (c) 1985 Ceriel J.H. Jacobs */
 2
 3#include "options.h"
 4#include "display.h"
 5#include "in_all.h"
 6#include "output.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  char **av = argv + 1;
26  char  *p;
27
28  if ((p = getenv("YAP")) != 0) {
29    (void)parsopt(p);
30  }
31  while (*av && **av == '-') {
32    if (parsopt(*av)) {
33      /*
34       * Error in option
35       */
36      putline(*av);
37      putline(": illegal option\n");
38      return (char **)0;
39    }
40    av++;
41  }
42  if (*av && **av == '+') {
43    /*
44     * Command in command line
45     */
46    startcomm = *av + 1;
47    av++;
48  }
49  return av;
50}
51
52static int
53parsopt(char *s)
54{
55  int i;
56
57  if (*s == '-')
58    s++;
59  if (isdigit(*s)) {
60    /*
61     * pagesize option
62     */
63    i = 0;
64    do {
65      i = i * 10 + *s++ - '0';
66    } while (isdigit(*s));
67    if (i < MINPAGESIZE)
68      i = MINPAGESIZE;
69    pagesize = i;
70  }
71  while (*s) {
72    switch (*s++) {
73      case 'c':
74        cflag++;
75        break;
76      case 'n':
77        nflag++;
78        break;
79      case 'u':
80        uflag++;
81        break;
82      case 'q':
83        qflag++;
84        break;
85      default:
86        return 1;
87    }
88  }
89  return 0;
90}