X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fopt%2Fopt.c;h=d376a598da932445de592c8f12e2466d4bc431bd;hp=de56299cc34a6259bd45650867e5b856d11116fc;hb=4f20b75c6133425f2b8c369bb1ecfbd7d3410353;hpb=0191b7a74144ea8193961235f45715e715d4d8eb

diff --git a/ccan/opt/opt.c b/ccan/opt/opt.c
index de56299c..d376a598 100644
--- a/ccan/opt/opt.c
+++ b/ccan/opt/opt.c
@@ -1,10 +1,9 @@
+/* Licensed under GPLv2+ - see LICENSE file for details */
 #include <ccan/opt/opt.h>
 #include <string.h>
 #include <errno.h>
-#include <getopt.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <err.h>
 #include <assert.h>
 #include <stdarg.h>
 #include <stdint.h>
@@ -13,11 +12,14 @@
 struct opt_table *opt_table;
 unsigned int opt_count, opt_num_short, opt_num_short_arg, opt_num_long;
 const char *opt_argv0;
+struct opt_alloc opt_alloc = {
+	malloc, realloc, free
+};
 
 /* Returns string after first '-'. */
 static const char *first_name(const char *names, unsigned *len)
 {
-	*len = strcspn(names + 1, "/= ");
+	*len = strcspn(names + 1, "|= ");
 	return names + 1;
 }
 
@@ -53,7 +55,7 @@ static const char *next_opt(const char *p, unsigned *i, unsigned *len)
 	return NULL;
 }
 
-static const char *first_lopt(unsigned *i, unsigned *len)
+const char *first_lopt(unsigned *i, unsigned *len)
 {
 	const char *p;
 	for (p = first_opt(i, len); p; p = next_opt(p, i, len)) {
@@ -67,7 +69,7 @@ static const char *first_lopt(unsigned *i, unsigned *len)
 	return p;
 }
 
-static const char *next_lopt(const char *p, unsigned *i, unsigned *len)
+const char *next_lopt(const char *p, unsigned *i, unsigned *len)
 {
 	for (p = next_opt(p, i, len); p; p = next_opt(p, i, len)) {
 		if (p[0] == '-') {
@@ -102,55 +104,57 @@ const char *next_sopt(const char *p, unsigned *i)
 	return p;
 }
 
+/* Avoids dependency on err.h or ccan/err */
+#ifndef failmsg
+#define failmsg(fmt, ...) \
+	do { fprintf(stderr, fmt, __VA_ARGS__); exit(1); } while(0)
+#endif
+
 static void check_opt(const struct opt_table *entry)
 {
 	const char *p;
 	unsigned len;
 
-	if (entry->type != OPT_HASARG && entry->type != OPT_NOARG)
-		errx(1, "Option %s: unknown entry type %u",
-		     entry->names, entry->type);
+	if (entry->type != OPT_HASARG && entry->type != OPT_NOARG
+	    && entry->type != (OPT_EARLY|OPT_HASARG)
+	    && entry->type != (OPT_EARLY|OPT_NOARG))
+		failmsg("Option %s: unknown entry type %u",
+			entry->names, entry->type);
 
 	if (!entry->desc)
-		errx(1, "Option %s: description cannot be NULL", entry->names);
+		failmsg("Option %s: description cannot be NULL", entry->names);
 
 
 	if (entry->names[0] != '-')
-		errx(1, "Option %s: does not begin with '-'", entry->names);
+		failmsg("Option %s: does not begin with '-'", entry->names);
 
 	for (p = first_name(entry->names, &len); p; p = next_name(p, &len)) {
 		if (*p == '-') {
 			if (len == 1)
-				errx(1, "Option %s: invalid long option '--'",
-				     entry->names);
+				failmsg("Option %s: invalid long option '--'",
+					entry->names);
 			opt_num_long++;
 		} else {
 			if (len != 1)
-				errx(1, "Option %s: invalid short option"
-				     " '%.*s'", entry->names, len+1, p-1);
-			if (*p == ':')
-				errx(1, "Option %s: invalid short option '-:'",
-				     entry->names);
+				failmsg("Option %s: invalid short option"
+					" '%.*s'", entry->names, len+1, p-1);
 			opt_num_short++;
-			if (entry->type == OPT_HASARG) {
+			if (entry->type == OPT_HASARG)
 				opt_num_short_arg++;
-				if (*p == '?')
-					errx(1, "Option %s: '-?' cannot take"
-					     " an argument", entry->names);
-			}
 		}
 		/* Don't document args unless there are some. */
 		if (entry->type == OPT_NOARG) {
 			if (p[len] == ' ' || p[len] == '=')
-				errx(1, "Option %s: does not take arguments"
-				     "'%s'", entry->names, p+len+1);
+				failmsg("Option %s: does not take arguments"
+					" '%s'", entry->names, p+len+1);
 		}
 	}
 }
 
 static void add_opt(const struct opt_table *entry)
 {
-	opt_table = realloc(opt_table, sizeof(opt_table[0]) * (opt_count+1));
+	opt_table = opt_alloc.realloc(opt_table,
+				      sizeof(opt_table[0]) * (opt_count+1));
 	opt_table[opt_count++] = *entry;
 }
 
@@ -158,7 +162,7 @@ void _opt_register(const char *names, enum opt_type type,
 		   char *(*cb)(void *arg),
 		   char *(*cb_arg)(const char *optarg, void *arg),
 		   void (*show)(char buf[OPT_SHOW_LEN], const void *arg),
-		   void *arg, const char *desc)
+		   const void *arg, const char *desc)
 {
 	struct opt_table opt;
 	opt.names = names;
@@ -166,12 +170,30 @@ void _opt_register(const char *names, enum opt_type type,
 	opt.cb = cb;
 	opt.cb_arg = cb_arg;
 	opt.show = show;
-	opt.arg = arg;
+	opt.u.carg = arg;
 	opt.desc = desc;
 	check_opt(&opt);
 	add_opt(&opt);
 }
 
+bool opt_unregister(const char *names)
+{
+	int found = -1, i;
+
+	for (i = 0; i < opt_count; i++) {
+		if (opt_table[i].type == OPT_SUBTABLE)
+			continue;
+		if (strcmp(opt_table[i].names, names) == 0)
+			found = i;
+	}
+	if (found == -1)
+		return false;
+	opt_count--;
+	memmove(&opt_table[found], &opt_table[found+1],
+		(opt_count - found) * sizeof(opt_table[found]));
+	return true;
+}
+
 void opt_register_table(const struct opt_table entry[], const char *desc)
 {
 	unsigned int i, start = opt_count;
@@ -191,154 +213,63 @@ void opt_register_table(const struct opt_table entry[], const char *desc)
 	}
 	/* We store the table length in arg ptr. */
 	if (desc)
-		opt_table[start].arg = (void *)(intptr_t)(opt_count - start);
+		opt_table[start].u.tlen = (opt_count - start);
 }
 
-static char *make_optstring(void)
-{
-	char *str = malloc(1 + opt_num_short + opt_num_short_arg + 1);
-	const char *p;
-	unsigned int i, num = 0;
-
-	/* This tells getopt_long we want a ':' returned for missing arg. */
-	str[num++] = ':';
-	for (p = first_sopt(&i); p; p = next_sopt(p, &i)) {
-		str[num++] = *p;
-		if (opt_table[i].type == OPT_HASARG)
-			str[num++] = ':';
-	}
-	str[num++] = '\0';
-	assert(num == 1 + opt_num_short + opt_num_short_arg + 1);
-	return str;
-}
-
-static struct option *make_options(void)
-{
-	struct option *options = malloc(sizeof(*options) * (opt_num_long + 1));
-	unsigned int i, num = 0, len = 0 /* GCC bogus warning */;
-	const char *p;
-
-	for (p = first_lopt(&i, &len); p; p = next_lopt(p, &i, &len)) {
-		char *buf = malloc(len + 1);
-		memcpy(buf, p, len);
-		buf[len] = 0;
-		options[num].name = buf;
-		options[num].has_arg = (opt_table[i].type == OPT_HASARG);
-		options[num].flag = NULL;
-		options[num].val = 0;
-		num++;
-	}
-	memset(&options[num], 0, sizeof(options[num]));
-	assert(num == opt_num_long);
-	return options;
-}
-
-static struct opt_table *find_short(char shortopt)
+/* Parse your arguments. */
+bool opt_parse(int *argc, char *argv[], void (*errlog)(const char *fmt, ...))
 {
-	unsigned int i;
-	const char *p;
+	int ret;
+	unsigned offset = 0;
 
-	for (p = first_sopt(&i); p; p = next_sopt(p, &i)) {
-		if (*p == shortopt)
-			return &opt_table[i];
-	}
-	abort();
-}
+	/* This helps opt_usage. */
+	opt_argv0 = argv[0];
 
-/* We want the index'th long entry. */
-static struct opt_table *find_long(int index, const char **name)
-{
-	unsigned int i, len;
-	const char *p;
+	while ((ret = parse_one(argc, argv, 0, &offset, errlog, false)) == 1);
 
-	for (p = first_lopt(&i, &len); p; p = next_lopt(p, &i, &len)) {
-		if (index == 0) {
-			*name = p;
-			return &opt_table[i];
-		}
-		index--;
-	}
-	abort();
+	/* parse_one returns 0 on finish, -1 on error */
+	return (ret == 0);
 }
 
-/* glibc does this as:
-/tmp/opt-example: invalid option -- 'x'
-/tmp/opt-example: unrecognized option '--long'
-/tmp/opt-example: option '--someflag' doesn't allow an argument
-/tmp/opt-example: option '--s' is ambiguous
-/tmp/opt-example: option requires an argument -- 's'
-*/
-static void parse_fail(void (*errlog)(const char *fmt, ...),
-		       char shortopt, const char *longopt, const char *problem)
+static bool early_parse(int argc, char *argv[],
+			void (*errlog)(const char *fmt, ...),
+			bool ignore_unknown)
 {
-	if (shortopt)
-		errlog("%s: -%c: %s", opt_argv0, shortopt, problem);
-	else
-		errlog("%s: --%.*s: %s", opt_argv0,
-		       strcspn(longopt, "/"), longopt, problem);
-}
+	int ret;
+	unsigned off = 0;
+	char **tmpargv = opt_alloc.alloc(sizeof(argv[0]) * (argc + 1));
 
-/* Parse your arguments. */
-bool opt_parse(int *argc, char *argv[], void (*errlog)(const char *fmt, ...))
-{
-	char *optstring = make_optstring();
-	struct option *options = make_options();
-	int ret, longidx = 0;
-	struct opt_table *e;
+	/* We could avoid a copy and skip instead, but this is simple. */
+	memcpy(tmpargv, argv, sizeof(argv[0]) * (argc + 1));
 
-	/* We will do our own error reporting. */
-	opterr = 0;
+	/* This helps opt_usage. */
 	opt_argv0 = argv[0];
 
-	/* Reset in case we're called more than once. */
-	optopt = 0;
-	optind = 0;
-	while ((ret = getopt_long(*argc, argv, optstring, options, &longidx))
-	       != -1) {
-		char *problem;
-		const char *name = NULL; /* GCC bogus warning */
-
-		/* optopt is 0 if it's an unknown long option, *or* if
-		 * -? is a valid short option. */
-		if (ret == '?') {
-			if (optopt || strncmp(argv[optind-1], "--", 2) == 0) {
-				parse_fail(errlog, optopt, argv[optind-1]+2,
-					   "unrecognized option");
-				break;
-			}
-		} else if (ret == ':') {
-			/* Missing argument: longidx not updated :( */
-			parse_fail(errlog, optopt, argv[optind-1]+2,
-				   "option requires an argument");
-			break;
-		}
+	while ((ret = parse_one(&argc, tmpargv, OPT_EARLY, &off, errlog, ignore_unknown)) == 1);
 
-		if (ret != 0)
-			e = find_short(ret);
-		else
-			e = find_long(longidx, &name);
+	opt_alloc.free(tmpargv);
 
-		if (e->type == OPT_HASARG)
-			problem = e->cb_arg(optarg, e->arg);
-		else
-			problem = e->cb(e->arg);
+	/* parse_one returns 0 on finish, -1 on error */
+	return (ret == 0);
+}
 
-		if (problem) {
-			parse_fail(errlog, ret, name, problem);
-			free(problem);
-			break;
-		}
-	}
-	free(optstring);
-	free(options);
-	if (ret != -1)
-		return false;
+bool opt_early_parse(int argc, char *argv[],
+		     void (*errlog)(const char *fmt, ...))
+{
+	return early_parse(argc, argv, errlog, false);
+}
 
-	/* We hide everything but remaining arguments. */
-	memmove(&argv[1], &argv[optind], sizeof(argv[1]) * (*argc-optind+1));
-	*argc -= optind - 1;
+bool opt_early_parse_incomplete(int argc, char *argv[],
+				void (*errlog)(const char *fmt, ...))
+{
+	return early_parse(argc, argv, errlog, true);
+}
 
-	return ret == -1 ? true : false;
+void opt_free_table(void)
+{
+	opt_alloc.free(opt_table);
+	opt_table = NULL;
+	opt_count = opt_num_short = opt_num_short_arg = opt_num_long = 0;
 }
 
 void opt_log_stderr(const char *fmt, ...)
@@ -364,7 +295,16 @@ void opt_log_stderr_exit(const char *fmt, ...)
 
 char *opt_invalid_argument(const char *arg)
 {
-	char *str = malloc(sizeof("Invalid argument '%s'") + strlen(arg));
+	char *str = opt_alloc.alloc(sizeof("Invalid argument '%s'") + strlen(arg));
 	sprintf(str, "Invalid argument '%s'", arg);
 	return str;
 }
+
+void opt_set_alloc(void *(*allocfn)(size_t size),
+		   void *(*reallocfn)(void *ptr, size_t size),
+		   void (*freefn)(void *ptr))
+{
+	opt_alloc.alloc = allocfn;
+	opt_alloc.realloc = reallocfn;
+	opt_alloc.free = freefn;
+}