[dpdk-dev] [Bug 238] [tree-wide] enhance getopt_long usage

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=238

            Bug ID: 238
           Summary: [tree-wide] enhance getopt_long usage
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: enhancement
          Priority: Low
         Component: other
          Assignee: dev at dpdk.org
          Reporter: david.marchand at redhat.com
  Target Milestone: future

We have quite a couple of the following pattern in the apps and examples
(quoting examples/fips_validation/main.c as a bad example):

        struct option lgopts[] = {
                        {REQ_FILE_PATH_KEYWORD, required_argument, 0, 0},
                        {RSP_FILE_PATH_KEYWORD, required_argument, 0, 0},
                        {FOLDER_KEYWORD, no_argument, 0, 0},
                        {CRYPTODEV_KEYWORD, required_argument, 0, 0},
                        {CRYPTODEV_ID_KEYWORD, required_argument, 0, 0},
                        {CRYPTODEV_ST_KEYWORD, no_argument, 0, 0},
                        {CRYPTODEV_BK_ID_KEYWORD, required_argument, 0, 0},
                        {CRYPTODEV_BK_DIR_KEY, required_argument, 0, 0},
                        {NULL, 0, 0, 0}
        };

        while ((opt = getopt_long(argc, argvopt, "s:",
                                  lgopts, &option_index)) != EOF) {

                switch (opt) {
                case 0:
                        if (strcmp(lgopts[option_index].name,
                                        REQ_FILE_PATH_KEYWORD) == 0)
                                env.req_path = optarg;
                        else if (strcmp(lgopts[option_index].name,
                                        RSP_FILE_PATH_KEYWORD) == 0)
                                env.rsp_path = optarg;
                        else if (strcmp(lgopts[option_index].name,
                                        FOLDER_KEYWORD) == 0)
                                env.is_path_folder = 1;
                        else if (strcmp(lgopts[option_index].name,
...


We can get rid of all those strcmp by directly binding each longopt with an int
enum.

eal has been using this convention for quite some time, see:
https://git.dpdk.org/dpdk/tree/lib/librte_eal/common/eal_options.h?h=v19.02
https://git.dpdk.org/dpdk/tree/lib/librte_eal/common/eal_common_options.c?h=v19.02

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