lib/params.c

   1 /*
   2  *      The PCI Library -- Parameters
   3  *
   4  *      Copyright (c) 2008 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 #include "internal.h"
  14
  15 char *
  16 pci_get_param(struct pci_access *acc, char *param)
  17 {
  18   struct pci_param *p;
  19
  20   for (p=acc->params; p; p=p->next)
  21     if (!strcmp(p->param, param))
  22       return p->value;
  23   return NULL;
  24 }
  25
  26 void
  27 pci_define_param(struct pci_access *acc, char *param, char *value, char *help)
  28 {
  29   struct pci_param *p = pci_malloc(acc, sizeof(*p));
  30
  31   p->next = acc->params;
  32   acc->params = p;
  33   p->param = param;
  34   p->value = value;
  35   p->value_malloced = 0;
  36   p->help = help;
  37 }
  38
  39 int
  40 pci_set_param_internal(struct pci_access *acc, char *param, char *value, int copy)
  41 {
  42   struct pci_param *p;
  43
  44   for (p=acc->params; p; p=p->next)
  45     if (!strcmp(p->param, param))
  46       {
  47         if (p->value_malloced)
  48           pci_mfree(p->value);
  49         p->value_malloced = copy;
  50         if (copy)
  51           p->value = pci_strdup(acc, value);
  52         else
  53           p->value = value;
  54         return 0;
  55       }
  56   return -1;
  57 }
  58
  59 int
  60 pci_set_param(struct pci_access *acc, char *param, char *value)
  61 {
  62   return pci_set_param_internal(acc, param, value, 1);
  63 }
  64
  65 void
  66 pci_free_params(struct pci_access *acc)
  67 {
  68   struct pci_param *p;
  69
  70   while (p = acc->params)
  71     {
  72       acc->params = p->next;
  73       if (p->value_malloced)
  74         pci_mfree(p->value);
  75       pci_mfree(p);
  76     }
  77 }
  78
  79 struct pci_param *
  80 pci_walk_params(struct pci_access *acc, struct pci_param *prev)
  81 {
  82   /* So far, the params form a simple linked list, but this can change in the future */
  83   if (!prev)
  84     return acc->params;
  85   else
  86     return prev->next;
  87 }