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GNU Info (libc.info)Suboptions ExampleParsing of Suboptions Example ----------------------------- The code which might appear in the `mount'(8) program is a perfect example of the use of `getsubopt': #include <stdio.h> #include <stdlib.h> #include <unistd.h> int do_all; const char *type; int read_size; int write_size; int read_only; enum { RO_OPTION = 0, RW_OPTION, READ_SIZE_OPTION, WRITE_SIZE_OPTION, THE_END }; const char *mount_opts[] = { [RO_OPTION] = "ro", [RW_OPTION] = "rw", [READ_SIZE_OPTION] = "rsize", [WRITE_SIZE_OPTION] = "wsize", [THE_END] = NULL }; int main (int argc, char *argv[]) { char *subopts, *value; int opt; while ((opt = getopt (argc, argv, "at:o:")) != -1) switch (opt) { case 'a': do_all = 1; break; case 't': type = optarg; break; case 'o': subopts = optarg; while (*subopts != '\0') switch (getsubopt (&subopts, mount_opts, &value)) { case RO_OPTION: read_only = 1; break; case RW_OPTION: read_only = 0; break; case READ_SIZE_OPTION: if (value == NULL) abort (); read_size = atoi (value); break; case WRITE_SIZE_OPTION: if (value == NULL) abort (); write_size = atoi (value); break; default: /* Unknown suboption. */ printf ("Unknown suboption `%s'\n", value); break; } break; default: abort (); } /* Do the real work. */ return 0; } automatically generated by info2www version 1.2.2.9 |