1 files changed, 104 insertions, 0 deletions
diff --git a/lib/params.c b/lib/params.c
new file mode 100644
index 0000000..9b4c2e2
--- /dev/null
+++ b/lib/params.c
@@ -0,0 +1,104 @@
+/*
+ *	The PCI Library -- Parameters
+ *
+ *	Copyright (c) 2008--2023 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL v2+.
+ *
+ *	SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "internal.h"
+
+char *
+pci_get_param(struct pci_access *acc, char *param)
+{
+  struct pci_param *p;
+
+  for (p=acc->params; p; p=p->next)
+    if (!strcmp(p->param, param))
+      return p->value;
+  return NULL;
+}
+
+struct pci_param *
+pci_define_param(struct pci_access *acc, char *param, char *value, char *help)
+{
+  struct pci_param *p, **pp;
+
+  for (pp=&acc->params; p = *pp; pp=&p->next)
+    {
+      int cmp = strcmp(p->param, param);
+      if (!cmp)
+	{
+	  if (strcmp(p->value, value) || strcmp(p->help, help))
+	    acc->error("Parameter %s re-defined differently", param);
+	  return p;
+	}
+      if (cmp > 0)
+	break;
+    }
+
+  p = pci_malloc(acc, sizeof(*p));
+  p->next = *pp;
+  *pp = p;
+  p->param = param;
+  p->value = value;
+  p->value_malloced = 0;
+  p->help = help;
+  return p;
+}
+
+int
+pci_set_param_internal(struct pci_access *acc, char *param, char *value, int copy)
+{
+  struct pci_param *p;
+
+  for (p=acc->params; p; p=p->next)
+    if (!strcmp(p->param, param))
+      {
+	if (p->value_malloced)
+	  pci_mfree(p->value);
+	p->value_malloced = copy;
+	if (copy)
+	  p->value = pci_strdup(acc, value);
+	else
+	  p->value = value;
+	return 0;
+      }
+  return -1;
+}
+
+int
+pci_set_param(struct pci_access *acc, char *param, char *value)
+{
+  return pci_set_param_internal(acc, param, value, 1);
+}
+
+void
+pci_free_params(struct pci_access *acc)
+{
+  struct pci_param *p;
+
+  while (p = acc->params)
+    {
+      acc->params = p->next;
+      if (p->value_malloced)
+	pci_mfree(p->value);
+      pci_mfree(p);
+    }
+}
+
+struct pci_param *
+pci_walk_params(struct pci_access *acc, struct pci_param *prev)
+{
+  /* So far, the params form a simple linked list, but this can change in the future */
+  if (!prev)
+    return acc->params;
+  else
+    return prev->next;
+}