#define PNAME "agedu"
+#define lenof(x) (sizeof((x))/sizeof(*(x)))
+
void fatal(const char *fmt, ...)
{
va_list ap;
}
}
+/*
+ * Largely frivolous way to define all my command-line options. I
+ * present here a parametric macro which declares a series of
+ * _logical_ option identifiers, and for each one declares zero or
+ * more short option characters and zero or more long option
+ * words. Then I repeatedly invoke that macro with its arguments
+ * defined to be various other macros, which allows me to
+ * variously:
+ *
+ * - define an enum allocating a distinct integer value to each
+ * logical option id
+ * - define a string consisting of precisely all the short option
+ * characters
+ * - define a string array consisting of all the long option
+ * strings
+ * - define (with help from auxiliary enums) integer arrays
+ * parallel to both of the above giving the logical option id
+ * for each physical short and long option
+ * - define an array indexed by logical option id indicating
+ * whether the option in question takes a value.
+ *
+ * It's not at all clear to me that this trickery is actually
+ * particularly _efficient_ - it still, after all, requires going
+ * linearly through the option list at run time and doing a
+ * strcmp, whereas in an ideal world I'd have liked the lists of
+ * long and short options to be pre-sorted so that a binary search
+ * or some other more efficient lookup was possible. (Not that
+ * asymptotic algorithmic complexity is remotely vital in option
+ * parsing, but if I were doing this in, say, Lisp or something
+ * with an equivalently powerful preprocessor then once I'd had
+ * the idea of preparing the option-parsing data structures at
+ * compile time I would probably have made the effort to prepare
+ * them _properly_. I could have Perl generate me a source file
+ * from some sort of description, I suppose, but that would seem
+ * like overkill. And in any case, it's more of a challenge to
+ * achieve as much as possible by cunning use of cpp and enum than
+ * to just write some sensible and logical code in a Turing-
+ * complete language. I said it was largely frivolous :-)
+ *
+ * This approach does have the virtue that it brings together the
+ * option ids and option spellings into a single combined list and
+ * defines them all in exactly one place. If I want to add a new
+ * option, or a new spelling for an option, I only have to modify
+ * the main OPTIONS macro below and then add code to process the
+ * new logical id.
+ *
+ * (Though, really, even that isn't ideal, since it still involves
+ * modifying the source file in more than one place. In a
+ * _properly_ ideal world, I'd be able to interleave the option
+ * definitions with the code fragments that process them. And then
+ * not bother defining logical identifiers for them at all - those
+ * would be automatically generated, since I wouldn't have any
+ * need to specify them manually in another part of the code.)
+ */
+
+#define OPTIONS(NOVAL, VAL, SHORT, LONG) \
+ NOVAL(HELP) SHORT(h) LONG(help) \
+ NOVAL(VERSION) SHORT(V) LONG(version) \
+ NOVAL(LICENCE) LONG(licence) LONG(license) \
+ NOVAL(SCAN) SHORT(s) LONG(scan) \
+ NOVAL(DUMP) SHORT(d) LONG(dump) \
+ NOVAL(TEXT) SHORT(t) LONG(text) \
+ NOVAL(HTML) SHORT(H) LONG(html) \
+ NOVAL(HTTPD) SHORT(w) LONG(web) LONG(server) LONG(httpd) \
+ NOVAL(PROGRESS) LONG(progress) LONG(scan_progress) \
+ NOVAL(NOPROGRESS) LONG(no_progress) LONG(no_scan_progress) \
+ NOVAL(TTYPROGRESS) LONG(tty_progress) LONG(tty_scan_progress) \
+ LONG(progress_tty) LONG(scan_progress_tty) \
+ NOVAL(CROSSFS) LONG(cross_fs) \
+ NOVAL(NOCROSSFS) LONG(no_cross_fs) \
+ VAL(DATAFILE) SHORT(f) LONG(file) \
+ VAL(MINAGE) SHORT(a) LONG(age) LONG(min_age) LONG(minimum_age) \
+ VAL(AUTH) LONG(auth) LONG(http_auth) LONG(httpd_auth) \
+ LONG(server_auth) LONG(web_auth) \
+ VAL(INCLUDE) LONG(include) \
+ VAL(INCLUDEPATH) LONG(include_path) \
+ VAL(EXCLUDE) LONG(exclude) \
+ VAL(EXCLUDEPATH) LONG(exclude_path)
+
+#define IGNORE(x)
+#define DEFENUM(x) OPT_ ## x,
+#define ZERO(x) 0,
+#define ONE(x) 1,
+#define STRING(x) #x ,
+#define STRINGNOCOMMA(x) #x
+#define SHORTNEWOPT(x) SHORTtmp_ ## x = OPT_ ## x,
+#define SHORTTHISOPT(x) SHORTtmp2_ ## x, SHORTVAL_ ## x = SHORTtmp2_ ## x - 1,
+#define SHORTOPTVAL(x) SHORTVAL_ ## x,
+#define SHORTTMP(x) SHORTtmp3_ ## x,
+#define LONGNEWOPT(x) LONGtmp_ ## x = OPT_ ## x,
+#define LONGTHISOPT(x) LONGtmp2_ ## x, LONGVAL_ ## x = LONGtmp2_ ## x - 1,
+#define LONGOPTVAL(x) LONGVAL_ ## x,
+#define LONGTMP(x) SHORTtmp3_ ## x,
+
+enum { OPTIONS(DEFENUM,DEFENUM,IGNORE,IGNORE) NOPTIONS };
+enum { OPTIONS(IGNORE,IGNORE,SHORTTMP,IGNORE) NSHORTOPTS };
+enum { OPTIONS(IGNORE,IGNORE,IGNORE,LONGTMP) NLONGOPTS };
+static const int opthasval[NOPTIONS] = {OPTIONS(ZERO,ONE,IGNORE,IGNORE)};
+static const char shortopts[] = {OPTIONS(IGNORE,IGNORE,STRINGNOCOMMA,IGNORE)};
+static const char *const longopts[] = {OPTIONS(IGNORE,IGNORE,IGNORE,STRING)};
+enum { OPTIONS(SHORTNEWOPT,SHORTNEWOPT,SHORTTHISOPT,IGNORE) };
+enum { OPTIONS(LONGNEWOPT,LONGNEWOPT,IGNORE,LONGTHISOPT) };
+static const int shortvals[] = {OPTIONS(IGNORE,IGNORE,SHORTOPTVAL,IGNORE)};
+static const int longvals[] = {OPTIONS(IGNORE,IGNORE,IGNORE,LONGOPTVAL)};
+
int main(int argc, char **argv)
{
int fd, count;
int ninex = 0, inexsize = 0;
int crossfs = 0;
+#ifdef DEBUG_MAD_OPTION_PARSING_MACROS
+ {
+ static const char *const optnames[NOPTIONS] = {
+ OPTIONS(STRING,STRING,IGNORE,IGNORE)
+ };
+ int i;
+ for (i = 0; i < NSHORTOPTS; i++)
+ printf("-%c == %s [%s]\n", shortopts[i], optnames[shortvals[i]],
+ opthasval[shortvals[i]] ? "value" : "no value");
+ for (i = 0; i < NLONGOPTS; i++)
+ printf("--%s == %s [%s]\n", longopts[i], optnames[longvals[i]],
+ opthasval[longvals[i]] ? "value" : "no value");
+ }
+#endif
+
while (--argc > 0) {
char *p = *++argv;
- char *optval;
if (doing_opts && *p == '-') {
+ int wordstart = 1;
+
if (!strcmp(p, "--")) {
doing_opts = 0;
- } else if (p[1] == '-') {
- char *optval = strchr(p, '=');
- if (optval)
- *optval++ = '\0';
- if (!strcmp(p, "--help")) {
- printf("FIXME: usage();\n");
- return 0;
- } else if (!strcmp(p, "--version")) {
- printf("FIXME: version();\n");
- return 0;
- } else if (!strcmp(p, "--licence") ||
- !strcmp(p, "--license")) {
- printf("FIXME: licence();\n");
- return 0;
- } else if (!strcmp(p, "--scan")) {
- mode = SCAN;
- } else if (!strcmp(p, "--dump")) {
- mode = DUMP;
- } else if (!strcmp(p, "--text")) {
- mode = TEXT;
- } else if (!strcmp(p, "--html")) {
- mode = HTML;
- } else if (!strcmp(p, "--httpd") ||
- !strcmp(p, "--server")) {
- mode = HTTPD;
- } else if (!strcmp(p, "--progress") ||
- !strcmp(p, "--scan-progress")) {
- progress = 2;
- } else if (!strcmp(p, "--no-progress") ||
- !strcmp(p, "--no-scan-progress")) {
- progress = 0;
- } else if (!strcmp(p, "--tty-progress") ||
- !strcmp(p, "--tty-scan-progress") ||
- !strcmp(p, "--progress-tty") ||
- !strcmp(p, "--scan-progress-tty")) {
- progress = 1;
- } else if (!strcmp(p, "--crossfs")) {
- crossfs = 1;
- } else if (!strcmp(p, "--no-crossfs")) {
- crossfs = 0;
- } else if (!strcmp(p, "--file") ||
- !strcmp(p, "--auth") ||
- !strcmp(p, "--http-auth") ||
- !strcmp(p, "--httpd-auth") ||
- !strcmp(p, "--server-auth") ||
- !strcmp(p, "--minimum-age") ||
- !strcmp(p, "--min-age") ||
- !strcmp(p, "--age") ||
- !strcmp(p, "--include") ||
- !strcmp(p, "--include-path") ||
- !strcmp(p, "--exclude") ||
- !strcmp(p, "--exclude-path")) {
+ continue;
+ }
+
+ p++;
+ while (*p) {
+ int optid = -1;
+ int i;
+ char *optval;
+
+ if (wordstart && *p == '-') {
/*
- * Long options requiring values.
+ * GNU-style long option.
*/
- if (!optval) {
- if (--argc > 0) {
- optval = *++argv;
- } else {
- fprintf(stderr, "%s: option '%s' requires"
- " an argument\n", PNAME, p);
- return 1;
+ p++;
+ optval = strchr(p, '=');
+ if (optval)
+ *optval++ = '\0';
+
+ for (i = 0; i < NLONGOPTS; i++) {
+ const char *opt = longopts[i], *s = p;
+ int match = 1;
+ /*
+ * The underscores in the option names
+ * defined above may be given by the user
+ * as underscores or dashes, or omitted
+ * entirely.
+ */
+ while (*opt) {
+ if (*opt == '_') {
+ if (*s == '-' || *s == '_')
+ s++;
+ } else {
+ if (*opt != *s) {
+ match = 0;
+ break;
+ }
+ s++;
+ }
+ opt++;
+ }
+ if (match && !*s) {
+ optid = longvals[i];
+ break;
}
}
- if (!strcmp(p, "--file")) {
- filename = optval;
- } else if (!strcmp(p, "--minimum-age") ||
- !strcmp(p, "--min-age") ||
- !strcmp(p, "--age")) {
- minage = optval;
- } else if (!strcmp(p, "--auth") ||
- !strcmp(p, "--http-auth") ||
- !strcmp(p, "--httpd-auth") ||
- !strcmp(p, "--server-auth")) {
- if (!strcmp(optval, "magic"))
- auth = HTTPD_AUTH_MAGIC;
- else if (!strcmp(optval, "basic"))
- auth = HTTPD_AUTH_BASIC;
- else if (!strcmp(optval, "none"))
- auth = HTTPD_AUTH_NONE;
- else if (!strcmp(optval, "default"))
- auth = HTTPD_AUTH_MAGIC | HTTPD_AUTH_BASIC;
- else {
- fprintf(stderr, "%s: unrecognised authentication"
- " type '%s'\n%*s options are 'magic',"
- " 'basic', 'none', 'default'\n",
- PNAME, optval, (int)strlen(PNAME), "");
+
+ if (optid < 0) {
+ fprintf(stderr, "%s: unrecognised option '--%s'\n",
+ PNAME, p);
+ return 1;
+ }
+
+ if (!opthasval[optid]) {
+ if (optval) {
+ fprintf(stderr, "%s: unexpected argument to option"
+ " '--%s'\n", PNAME, p);
return 1;
}
- } else if (!strcmp(p, "--include") ||
- !strcmp(p, "--include-path") ||
- !strcmp(p, "--exclude") ||
- !strcmp(p, "--exclude-path")) {
- if (ninex >= inexsize) {
- inexsize = ninex * 3 / 2 + 16;
- inex = sresize(inex, inexsize,
- struct inclusion_exclusion);
+ } else {
+ if (!optval) {
+ if (--argc > 0) {
+ optval = *++argv;
+ } else {
+ fprintf(stderr, "%s: option '--%s' expects"
+ " an argument\n", PNAME, p);
+ return 1;
+ }
}
- inex[ninex].path = (!strcmp(p, "--include-path") ||
- !strcmp(p, "--exclude-path"));
- inex[ninex].include = (!strcmp(p, "--include") ||
- !strcmp(p, "--include-path"));
- inex[ninex].wildcard = optval;
- ninex++;
}
+
+ p += strlen(p); /* finished with this argument word */
} else {
- fprintf(stderr, "%s: unrecognised option '%s'\n",
- PNAME, p);
- return 1;
- }
- } else {
- p++;
- while (*p) {
+ /*
+ * Short option.
+ */
char c = *p++;
- switch (c) {
- /* Options requiring arguments. */
- case 'f':
- case 'a':
+ for (i = 0; i < NSHORTOPTS; i++)
+ if (c == shortopts[i]) {
+ optid = shortvals[i];
+ break;
+ }
+
+ if (optid < 0) {
+ fprintf(stderr, "%s: unrecognised option '-%c'\n",
+ PNAME, c);
+ return 1;
+ }
+
+ if (opthasval[optid]) {
if (*p) {
optval = p;
p += strlen(p);
} else if (--argc > 0) {
optval = *++argv;
} else {
- fprintf(stderr, "%s: option '-%c' requires"
+ fprintf(stderr, "%s: option '-%c' expects"
" an argument\n", PNAME, c);
return 1;
}
- switch (c) {
- case 'f': /* data file name */
- filename = optval;
- break;
- case 'a': /* maximum age */
- minage = optval;
- break;
- }
- break;
- case 's':
- mode = SCAN;
- break;
- default:
- fprintf(stderr, "%s: unrecognised option '-%c'\n",
- PNAME, c);
- return 1;
- }
- }
- }
+ } else {
+ optval = NULL;
+ }
+ }
+
+ wordstart = 0;
+
+ /*
+ * Now actually process the option.
+ */
+ switch (optid) {
+ case OPT_HELP:
+ printf("FIXME: usage();\n");
+ return 0;
+ case OPT_VERSION:
+ printf("FIXME: version();\n");
+ return 0;
+ case OPT_LICENCE:
+ printf("FIXME: licence();\n");
+ return 0;
+ case OPT_SCAN:
+ mode = SCAN;
+ break;
+ case OPT_DUMP:
+ mode = DUMP;
+ break;
+ case OPT_TEXT:
+ mode = TEXT;
+ break;
+ case OPT_HTML:
+ mode = HTML;
+ break;
+ case OPT_HTTPD:
+ mode = HTTPD;
+ break;
+ case OPT_PROGRESS:
+ progress = 2;
+ break;
+ case OPT_NOPROGRESS:
+ progress = 0;
+ break;
+ case OPT_TTYPROGRESS:
+ progress = 1;
+ break;
+ case OPT_CROSSFS:
+ crossfs = 1;
+ break;
+ case OPT_NOCROSSFS:
+ crossfs = 0;
+ break;
+ case OPT_DATAFILE:
+ filename = optval;
+ break;
+ case OPT_MINAGE:
+ minage = optval;
+ break;
+ case OPT_AUTH:
+ if (!strcmp(optval, "magic"))
+ auth = HTTPD_AUTH_MAGIC;
+ else if (!strcmp(optval, "basic"))
+ auth = HTTPD_AUTH_BASIC;
+ else if (!strcmp(optval, "none"))
+ auth = HTTPD_AUTH_NONE;
+ else if (!strcmp(optval, "default"))
+ auth = HTTPD_AUTH_MAGIC | HTTPD_AUTH_BASIC;
+ else {
+ fprintf(stderr, "%s: unrecognised authentication"
+ " type '%s'\n%*s options are 'magic',"
+ " 'basic', 'none', 'default'\n",
+ PNAME, optval, (int)strlen(PNAME), "");
+ return 1;
+ }
+ break;
+ case OPT_INCLUDE:
+ case OPT_INCLUDEPATH:
+ case OPT_EXCLUDE:
+ case OPT_EXCLUDEPATH:
+ if (ninex >= inexsize) {
+ inexsize = ninex * 3 / 2 + 16;
+ inex = sresize(inex, inexsize,
+ struct inclusion_exclusion);
+ }
+ inex[ninex].path = (optid == OPT_INCLUDEPATH ||
+ optid == OPT_EXCLUDEPATH);
+ inex[ninex].include = (optid == OPT_INCLUDE ||
+ optid == OPT_INCLUDEPATH);
+ inex[ninex].wildcard = optval;
+ ninex++;
+ break;
+ }
+ }
} else {
if (!rootdir) {
rootdir = p;
~mdw / sgt / agedu / commitdiff