1 /*
2 * The PCI Library -- Parameters
3 *
4 * Copyright (c) 2008--2023 Martin Mares <[email protected]>
5 *
6 * Can be freely distributed and used under the terms of the GNU GPL v2+.
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14
15 #include "internal.h"
16
17 char *
pci_get_param(struct pci_access * acc,char * param)18 pci_get_param(struct pci_access *acc, char *param)
19 {
20 struct pci_param *p;
21
22 for (p=acc->params; p; p=p->next)
23 if (!strcmp(p->param, param))
24 return p->value;
25 return NULL;
26 }
27
28 struct pci_param *
pci_define_param(struct pci_access * acc,char * param,char * value,char * help)29 pci_define_param(struct pci_access *acc, char *param, char *value, char *help)
30 {
31 struct pci_param *p, **pp;
32
33 for (pp=&acc->params; p = *pp; pp=&p->next)
34 {
35 int cmp = strcmp(p->param, param);
36 if (!cmp)
37 {
38 if (strcmp(p->value, value) || strcmp(p->help, help))
39 acc->error("Parameter %s re-defined differently", param);
40 return p;
41 }
42 if (cmp > 0)
43 break;
44 }
45
46 p = pci_malloc(acc, sizeof(*p));
47 p->next = *pp;
48 *pp = p;
49 p->param = param;
50 p->value = value;
51 p->value_malloced = 0;
52 p->help = help;
53 return p;
54 }
55
56 int
pci_set_param_internal(struct pci_access * acc,char * param,char * value,int copy)57 pci_set_param_internal(struct pci_access *acc, char *param, char *value, int copy)
58 {
59 struct pci_param *p;
60
61 for (p=acc->params; p; p=p->next)
62 if (!strcmp(p->param, param))
63 {
64 if (p->value_malloced)
65 pci_mfree(p->value);
66 p->value_malloced = copy;
67 if (copy)
68 p->value = pci_strdup(acc, value);
69 else
70 p->value = value;
71 return 0;
72 }
73 return -1;
74 }
75
76 int
pci_set_param(struct pci_access * acc,char * param,char * value)77 pci_set_param(struct pci_access *acc, char *param, char *value)
78 {
79 return pci_set_param_internal(acc, param, value, 1);
80 }
81
82 void
pci_free_params(struct pci_access * acc)83 pci_free_params(struct pci_access *acc)
84 {
85 struct pci_param *p;
86
87 while (p = acc->params)
88 {
89 acc->params = p->next;
90 if (p->value_malloced)
91 pci_mfree(p->value);
92 pci_mfree(p);
93 }
94 }
95
96 struct pci_param *
pci_walk_params(struct pci_access * acc,struct pci_param * prev)97 pci_walk_params(struct pci_access *acc, struct pci_param *prev)
98 {
99 /* So far, the params form a simple linked list, but this can change in the future */
100 if (!prev)
101 return acc->params;
102 else
103 return prev->next;
104 }
105