lib/librte_eal/common/rte_option.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Intel Corporation.
   3  */
   4
   5 #include <getopt.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8
   9 #include <rte_eal.h>
  10 #include <rte_option.h>
  11
  12 #include "eal_private.h"
  13 #include "eal_internal_cfg.h" /* Necessary for eal_options.h */
  14 #include "eal_options.h"
  15
  16 TAILQ_HEAD(rte_option_list, rte_option);
  17
  18 struct rte_option_list rte_option_list =
  19         TAILQ_HEAD_INITIALIZER(rte_option_list);
  20
  21 int
  22 rte_option_parse(const char *opt)
  23 {
  24         struct rte_option *option;
  25
  26         if (strlen(opt) <= 2 ||
  27             strncmp(opt, "--", 2))
  28                 return -1;
  29
  30         /* Check if the option is registered */
  31         TAILQ_FOREACH(option, &rte_option_list, next) {
  32                 if (strcmp(&opt[2], option->name) == 0) {
  33                         option->enabled = 1;
  34                         return 0;
  35                 }
  36         }
  37
  38         return -1;
  39 }
  40
  41 int
  42 rte_option_register(struct rte_option *opt)
  43 {
  44         struct rte_option *option;
  45         const struct option *gopt;
  46
  47         gopt = &eal_long_options[0];
  48         while (gopt->name != NULL) {
  49                 if (strcmp(gopt->name, opt->name) == 0) {
  50                         RTE_LOG(ERR, EAL, "Option %s is already a common EAL option.\n",
  51                                         opt->name);
  52                         return -1;
  53                 }
  54                 gopt++;
  55         }
  56
  57         TAILQ_FOREACH(option, &rte_option_list, next) {
  58                 if (strcmp(opt->name, option->name) == 0) {
  59                         RTE_LOG(ERR, EAL, "Option %s has already been registered.\n",
  60                                         opt->name);
  61                         return -1;
  62                 }
  63         }
  64
  65         TAILQ_INSERT_HEAD(&rte_option_list, opt, next);
  66         return 0;
  67 }
  68
  69 void
  70 rte_option_init(void)
  71 {
  72         struct rte_option *option;
  73
  74         TAILQ_FOREACH(option, &rte_option_list, next) {
  75                 if (option->enabled)
  76                         option->cb();
  77         }
  78 }
  79
  80 void
  81 rte_option_usage(void)
  82 {
  83         struct rte_option *option;
  84         int opt_count = 0;
  85
  86         TAILQ_FOREACH(option, &rte_option_list, next)
  87                 opt_count += 1;
  88         if (opt_count == 0)
  89                 return;
  90
  91         printf("EAL dynamic options:\n");
  92         TAILQ_FOREACH(option, &rte_option_list, next)
  93                 printf("  --%-*s %s\n", 17, option->name, option->usage);
  94         printf("\n");
  95 }