diff options
Diffstat (limited to 'paxinc.c')
| -rw-r--r-- | paxinc.c | 50 |
1 files changed, 50 insertions, 0 deletions
@@ -198,3 +198,53 @@ const char *root_rel_path(const char *path) return path; } + +void pax_usage( + const char *header, + const char *args, + const char *parse_flags, + const struct option long_opts[], + const char * const opts_help[], + int status) +{ + const char a_arg[] = "<arg>"; + size_t a_arg_len = strlen(a_arg) + 2; + size_t i; + int optlen; + + printf("* %s\n\n" + "Usage: %s [options] %s\n\n", header, argv0, args); + printf("Options: -[%s]\n", parse_flags); + + /* Prescan the --long opt length to auto-align. */ + optlen = 0; + for (i = 0; long_opts[i].name; ++i) { + int l = strlen(long_opts[i].name); + if (long_opts[i].has_arg == a_argument) + l += a_arg_len; + optlen = max(l, optlen); + } + /* Use some reasonable min width. */ + optlen = max(20, optlen); + + for (i = 0; long_opts[i].name; ++i) { + /* First output the short flag if it has one. */ + if (long_opts[i].val > '~') + printf(" "); + else + printf(" -%c, ", long_opts[i].val); + + /* Then the long flag. */ + if (long_opts[i].has_arg == no_argument) + printf("--%-*s", optlen, long_opts[i].name); + else + printf("--%s %s %*s", long_opts[i].name, a_arg, + (int)(optlen - strlen(long_opts[i].name) - a_arg_len), ""); + + /* Finally the help text. */ + printf("* %s\n", opts_help[i]); + } + + printf("\nFor more information, see the %s(1) manpage.\n", argv0); + exit(status); +} |