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 __rte_experimental
  42 int
  43 rte_option_register(struct rte_option *opt)
  44 {
  45         struct rte_option *option;
  46         const struct option *gopt;
  47
  48         gopt = &eal_long_options[0];
  49         while (gopt->name != NULL) {
  50                 if (strcmp(gopt->name, opt->name) == 0) {
  51                         RTE_LOG(ERR, EAL, "Option %s is already a common EAL option.\n",
  52                                         opt->name);
  53                         return -1;
  54                 }
  55                 gopt++;
  56         }
  57
  58         TAILQ_FOREACH(option, &rte_option_list, next) {
  59                 if (strcmp(opt->name, option->name) == 0) {
  60                         RTE_LOG(ERR, EAL, "Option %s has already been registered.\n",
  61                                         opt->name);
  62                         return -1;
  63                 }
  64         }
  65
  66         TAILQ_INSERT_HEAD(&rte_option_list, opt, next);
  67         return 0;
  68 }
  69
  70 void
  71 rte_option_init(void)
  72 {
  73         struct rte_option *option;
  74
  75         TAILQ_FOREACH(option, &rte_option_list, next) {
  76                 if (option->enabled)
  77                         option->cb();
  78         }
  79 }
  80
  81 void
  82 rte_option_usage(void)
  83 {
  84         struct rte_option *option;
  85         int opt_count = 0;
  86
  87         TAILQ_FOREACH(option, &rte_option_list, next)
  88                 opt_count += 1;
  89         if (opt_count == 0)
  90                 return;
  91
  92         printf("EAL dynamic options:\n");
  93         TAILQ_FOREACH(option, &rte_option_list, next)
  94                 printf("  --%-*s %s\n", 17, option->name, option->usage);
  95         printf("\n");
  96 }