1/* SPDX-License-Identifier: GPL-2.0+ */
2/* utils.h
3 * originally written by: Kirk Reiser.
4 *
5 ** Copyright (C) 2002 Kirk Reiser.
6 * Copyright (C) 2003 David Borowski.
7 */
8
9#include <stdio.h>
10
11#define MAXKEYS 512
12#define MAXKEYVAL 160
13#define HASHSIZE 101
14#define is_shift -3
15#define is_spk -2
16#define is_input -1
17
18struct st_key {
19 char *name;
20 struct st_key *next;
21 int value, shift;
22};
23
24struct st_key key_table[MAXKEYS];
25struct st_key *extra_keys = key_table+HASHSIZE;
26char *def_name, *def_val;
27FILE *infile;
28int lc;
29
30char filename[256];
31
32static inline void open_input(const char *dir_name, const char *name)
33{
34 if (dir_name)
35 snprintf(s: filename, maxlen: sizeof(filename), format: "%s/%s", dir_name, name);
36 else
37 snprintf(s: filename, maxlen: sizeof(filename), format: "%s", name);
38 infile = fopen(filename: filename, modes: "r");
39 if (infile == 0) {
40 fprintf(stderr, format: "can't open %s\n", filename);
41 exit(status: 1);
42 }
43 lc = 0;
44}
45
46static inline int oops(const char *msg, const char *info)
47{
48 if (info == NULL)
49 info = "";
50 fprintf(stderr, format: "error: file %s line %d\n", filename, lc);
51 fprintf(stderr, format: "%s %s\n", msg, info);
52 exit(status: 1);
53}
54
55static inline struct st_key *hash_name(char *name)
56{
57 unsigned char *pn = (unsigned char *)name;
58 int hash = 0;
59
60 while (*pn) {
61 hash = (hash * 17) & 0xfffffff;
62 if (isupper(*pn))
63 *pn = tolower(*pn);
64 hash += (int)*pn;
65 pn++;
66 }
67 hash %= HASHSIZE;
68 return &key_table[hash];
69}
70
71static inline struct st_key *find_key(char *name)
72{
73 struct st_key *this = hash_name(name);
74
75 while (this) {
76 if (this->name && !strcmp(s1: name, s2: this->name))
77 return this;
78 this = this->next;
79 }
80 return this;
81}
82
83static inline struct st_key *add_key(char *name, int value, int shift)
84{
85 struct st_key *this = hash_name(name);
86
87 if (extra_keys-key_table >= MAXKEYS)
88 oops(msg: "out of key table space, enlarge MAXKEYS", NULL);
89 if (this->name != NULL) {
90 while (this->next) {
91 if (!strcmp(s1: name, s2: this->name))
92 oops(msg: "attempt to add duplicate key", info: name);
93 this = this->next;
94 }
95 this->next = extra_keys++;
96 this = this->next;
97 }
98 this->name = strdup(s: name);
99 this->value = value;
100 this->shift = shift;
101 return this;
102}
103

source code of linux/drivers/accessibility/speakup/utils.h