X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=parse.c;h=ad2b1e3c76cf9a3691a7466598de6823b8064b20;hp=ca78f904dd0bd7ef97897fa10446e73ad6fb3279;hb=d091d099aa867596745f2fa0d58631a14a746520;hpb=15ca150e8dbfd68aa5beb479fcb3f07447417a04

diff --git a/parse.c b/parse.c
index ca78f904..ad2b1e3c 100644
--- a/parse.c
+++ b/parse.c
@@ -8,9 +8,14 @@
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
+#include <stdlib.h>
 
 #include "parse.h"
 #include "debug.h"
+#include "options.h"
+
+static struct fio_option *fio_options;
+extern unsigned int fio_get_kb_base(void *);
 
 static int vp_cmp(const void *p1, const void *p2)
 {
@@ -38,35 +43,63 @@ static void posval_sort(struct fio_option *o, struct value_pair *vpmap)
 	qsort(vpmap, entries, sizeof(struct value_pair), vp_cmp);
 }
 
-static void show_option_range(struct fio_option *o)
+static void show_option_range(struct fio_option *o, FILE *out)
 {
 	if (!o->minval && !o->maxval)
 		return;
 
-	printf("%20s: min=%d, max=%d\n", "range", o->minval, o->maxval);
+	fprintf(out, "%20s: min=%d", "range", o->minval);
+	if (o->maxval)
+		fprintf(out, ", max=%d", o->maxval);
+	fprintf(out, "\n");
 }
 
 static void show_option_values(struct fio_option *o)
 {
-	int i = 0;
+	int i;
 
-	do {
+	for (i = 0; i < PARSE_MAX_VP; i++) {
 		const struct value_pair *vp = &o->posval[i];
 
 		if (!vp->ival)
-			break;
+			continue;
 
 		printf("%20s: %-10s", i == 0 ? "valid values" : "", vp->ival);
 		if (vp->help)
 			printf(" %s", vp->help);
 		printf("\n");
-		i++;
-	} while (i < PARSE_MAX_VP);
+	}
 
 	if (i)
 		printf("\n");
 }
 
+static void show_option_help(struct fio_option *o, FILE *out)
+{
+	const char *typehelp[] = {
+		"invalid",
+		"string (opt=bla)",
+		"string with possible k/m/g postfix (opt=4k)",
+		"string with time postfix (opt=10s)",
+		"string (opt=bla)",
+		"string with dual range (opt=1k-4k,4k-8k)",
+		"integer value (opt=100)",
+		"boolean value (opt=1)",
+		"no argument (opt)",
+		"deprecated",
+	};
+
+	if (o->alias)
+		fprintf(out, "%20s: %s\n", "alias", o->alias);
+
+	fprintf(out, "%20s: %s\n", "type", typehelp[o->type]);
+	fprintf(out, "%20s: %s\n", "default", o->def ? o->def : "no default");
+	if (o->prof_name)
+		fprintf(out, "%20s: only for profile '%s'\n", "valid", o->prof_name);
+	show_option_range(o, stdout);
+	show_option_values(o);
+}
+
 static unsigned long get_mult_time(char c)
 {
 	switch (c) {
@@ -84,57 +117,81 @@ static unsigned long get_mult_time(char c)
 	}
 }
 
-static unsigned long get_mult_bytes(char c)
+static unsigned long long get_mult_bytes(char c, void *data)
 {
+	unsigned int kb_base = fio_get_kb_base(data);
+	unsigned long long ret = 1;
+
 	switch (c) {
-	case 'k':
-	case 'K':
-		return 1024;
-	case 'm':
-	case 'M':
-		return 1024 * 1024;
+	default:
+		break;
+	case 'p':
+	case 'P':
+		ret *= (unsigned long long) kb_base;
+	case 't':
+	case 'T':
+		ret *= (unsigned long long) kb_base;
 	case 'g':
 	case 'G':
-		return 1024 * 1024 * 1024;
-	case 'e':
-	case 'E':
-		return 1024 * 1024 * 1024 * 1024UL;
-	default:
-		return 1;
+		ret *= (unsigned long long) kb_base;
+	case 'm':
+	case 'M':
+		ret *= (unsigned long long) kb_base;
+	case 'k':
+	case 'K':
+		ret *= (unsigned long long) kb_base;
+		break;
 	}
+
+	return ret;
 }
 
 /*
  * convert string into decimal value, noting any size suffix
  */
-int str_to_decimal(const char *str, long long *val, int kilo)
+int str_to_decimal(const char *str, long long *val, int kilo, void *data)
 {
-	int len;
+	int len, base;
 
 	len = strlen(str);
 	if (!len)
 		return 1;
 
-	*val = strtoll(str, NULL, 10);
+	if (strstr(str, "0x") || strstr(str, "0X"))
+		base = 16;
+	else
+		base = 10;
+
+	*val = strtoll(str, NULL, base);
 	if (*val == LONG_MAX && errno == ERANGE)
 		return 1;
 
-	if (kilo)
-		*val *= get_mult_bytes(str[len - 1]);
-	else
+	if (kilo) {
+		const char *p;
+		/*
+		 * if the last char is 'b' or 'B', the user likely used
+		 * "1gb" instead of just "1g". If the second to last is also
+		 * a letter, adjust.
+		 */
+		p = str + len - 1;
+		if ((*p == 'b' || *p == 'B') && isalpha(*(p - 1)))
+			--p;
+
+		*val *= get_mult_bytes(*p, data);
+	} else
 		*val *= get_mult_time(str[len - 1]);
 
 	return 0;
 }
 
-static int check_str_bytes(const char *p, long long *val)
+static int check_str_bytes(const char *p, long long *val, void *data)
 {
-	return str_to_decimal(p, val, 1);
+	return str_to_decimal(p, val, 1, data);
 }
 
 static int check_str_time(const char *p, long long *val)
 {
-	return str_to_decimal(p, val, 0);
+	return str_to_decimal(p, val, 0, NULL);
 }
 
 void strip_blank_front(char **p)
@@ -149,7 +206,7 @@ void strip_blank_front(char **p)
 
 void strip_blank_end(char *p)
 {
-	char *s;
+	char *start = p, *s;
 
 	s = strchr(p, ';');
 	if (s)
@@ -161,13 +218,13 @@ void strip_blank_end(char *p)
 		p = s;
 
 	s = p + strlen(p);
-	while ((isspace(*s) || iscntrl(*s)) && (s > p))
+	while ((isspace(*s) || iscntrl(*s)) && (s > start))
 		s--;
 
 	*(s + 1) = '\0';
 }
 
-static int check_range_bytes(const char *str, long *val)
+static int check_range_bytes(const char *str, long *val, void *data)
 {
 	char suffix;
 
@@ -175,7 +232,7 @@ static int check_range_bytes(const char *str, long *val)
 		return 1;
 
 	if (sscanf(str, "%lu%c", val, &suffix) == 2) {
-		*val *= get_mult_bytes(suffix);
+		*val *= get_mult_bytes(suffix, data);
 		return 0;
 	}
 
@@ -200,25 +257,13 @@ static int check_int(const char *p, int *val)
 	return 1;
 }
 
-static struct fio_option *find_option(struct fio_option *options,
-				      const char *opt)
-{
-	struct fio_option *o;
-
-	for (o = &options[0]; o->name; o++) {
-		if (!strcmp(o->name, opt))
-			return o;
-		else if (o->alias && !strcmp(o->alias, opt))
-			return o;
-	}
-
-	return NULL;
-}
-
-#define val_store(ptr, val, off, data)			\
+#define val_store(ptr, val, off, or, data)		\
 	do {						\
 		ptr = td_var((data), (off));		\
-		*ptr = (val);				\
+		if ((or))				\
+			*ptr |= (val);			\
+		else					\
+			*ptr = (val);			\
 	} while (0)
 
 static int __handle_option(struct fio_option *o, const char *ptr, void *data,
@@ -233,35 +278,44 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 	dprint(FD_PARSE, "__handle_option=%s, type=%d, ptr=%s\n", o->name,
 							o->type, ptr);
 
-	if (!ptr && o->type != FIO_OPT_STR_SET) {
+	if (!ptr && o->type != FIO_OPT_STR_SET && o->type != FIO_OPT_STR) {
 		fprintf(stderr, "Option %s requires an argument\n", o->name);
 		return 1;
 	}
 
 	switch (o->type) {
-	case FIO_OPT_STR: {
+	case FIO_OPT_STR:
+	case FIO_OPT_STR_MULTI: {
 		fio_opt_str_fn *fn = o->cb;
 		const struct value_pair *vp;
 		struct value_pair posval[PARSE_MAX_VP];
-		int i;
+		int i, all_skipped = 1;
 
 		posval_sort(o, posval);
 
+		ret = 1;
 		for (i = 0; i < PARSE_MAX_VP; i++) {
 			vp = &posval[i];
 			if (!vp->ival || vp->ival[0] == '\0')
-				break;
-			ret = 1;
+				continue;
+			all_skipped = 0;
 			if (!strncmp(vp->ival, ptr, strlen(vp->ival))) {
 				ret = 0;
-				if (!o->off1)
-					break;
-				val_store(ilp, vp->oval, o->off1, data);
-				break;
+				if (o->roff1) {
+					if (vp->or)
+						*(unsigned int *) o->roff1 |= vp->oval;
+					else
+						*(unsigned int *) o->roff1 = vp->oval;
+				} else {
+					if (!o->off1)
+						continue;
+					val_store(ilp, vp->oval, o->off1, vp->or, data);
+				}
+				continue;
 			}
 		}
 
-		if (ret)
+		if (ret && !all_skipped)
 			show_option_values(o);
 		else if (fn)
 			ret = fn(data, ptr);
@@ -269,14 +323,14 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 	}
 	case FIO_OPT_STR_VAL_TIME:
 		is_time = 1;
-	case FIO_OPT_STR_VAL:
-	case FIO_OPT_STR_VAL_INT: {
+	case FIO_OPT_INT:
+	case FIO_OPT_STR_VAL: {
 		fio_opt_str_val_fn *fn = o->cb;
 
 		if (is_time)
 			ret = check_str_time(ptr, &ull);
 		else
-			ret = check_str_bytes(ptr, &ull);
+			ret = check_str_bytes(ptr, &ull, data);
 
 		if (ret)
 			break;
@@ -295,16 +349,32 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 		if (fn)
 			ret = fn(data, &ull);
 		else {
-			if (o->type == FIO_OPT_STR_VAL_INT) {
-				if (first)
-					val_store(ilp, ull, o->off1, data);
-				if (!more && o->off2)
-					val_store(ilp, ull, o->off2, data);
+			if (o->type == FIO_OPT_INT) {
+				if (first) {
+					if (o->roff1)
+						*(unsigned int *) o->roff1 = ull;
+					else
+						val_store(ilp, ull, o->off1, 0, data);
+				}
+				if (!more) {
+					if (o->roff2)
+						*(unsigned int *) o->roff2 = ull;
+					else if (o->off2)
+						val_store(ilp, ull, o->off2, 0, data);
+				}
 			} else {
-				if (first)
-					val_store(ullp, ull, o->off1, data);
-				if (!more && o->off2)
-					val_store(ullp, ull, o->off2, data);
+				if (first) {
+					if (o->roff1)
+						*(unsigned long long *) o->roff1 = ull;
+					else
+						val_store(ullp, ull, o->off1, 0, data);
+				}
+				if (!more) {
+					if (o->roff2)
+						*(unsigned long long *) o->roff2 =  ull;
+					else if (o->off2)
+						val_store(ullp, ull, o->off2, 0, data);
+				}
 			}
 		}
 		break;
@@ -312,7 +382,11 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 	case FIO_OPT_STR_STORE: {
 		fio_opt_str_fn *fn = o->cb;
 
-		cp = td_var(data, o->off1);
+		if (o->roff1)
+			cp = (char **) o->roff1;
+		else
+			cp = td_var(data, o->off1);
+
 		*cp = strdup(ptr);
 		if (fn) {
 			ret = fn(data, ptr);
@@ -343,8 +417,8 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 		p1 = tmp;
 
 		ret = 1;
-		if (!check_range_bytes(p1, &ul1) &&
-		    !check_range_bytes(p2, &ul2)) {
+		if (!check_range_bytes(p1, &ul1, data) &&
+		    !check_range_bytes(p2, &ul2, data)) {
 			ret = 0;
 			if (ul1 > ul2) {
 				unsigned long foo = ul1;
@@ -354,18 +428,26 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 			}
 
 			if (first) {
-				val_store(ilp, ul1, o->off1, data);
-				val_store(ilp, ul2, o->off2, data);
+				if (o->roff1)
+					*(unsigned int *) o->roff1 = ul1;
+				else
+					val_store(ilp, ul1, o->off1, 0, data);
+				if (o->roff2)
+					*(unsigned int *) o->roff2 = ul2;
+				else
+					val_store(ilp, ul2, o->off2, 0, data);
 			}
-			if (o->off3 && o->off4) {
-				val_store(ilp, ul1, o->off3, data);
-				val_store(ilp, ul2, o->off4, data);
+			if (o->roff3 && o->roff4) {
+				*(unsigned int *) o->roff3 = ul1;
+				*(unsigned int *) o->roff4 = ul2;
+			} else if (o->off3 && o->off4) {
+				val_store(ilp, ul1, o->off3, 0, data);
+				val_store(ilp, ul2, o->off4, 0, data);
 			}
 		}
 
 		break;
 	}
-	case FIO_OPT_INT:
 	case FIO_OPT_BOOL: {
 		fio_opt_int_fn *fn = o->cb;
 
@@ -390,10 +472,18 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 		if (fn)
 			ret = fn(data, &il);
 		else {
-			if (first)
-				val_store(ilp, il, o->off1, data);
-			if (!more && o->off2)
-				val_store(ilp, il, o->off2, data);
+			if (first) {
+				if (o->roff1)
+					*(unsigned int *)o->roff1 = il;
+				else
+					val_store(ilp, il, o->off1, 0, data);
+			}
+			if (!more) {
+				if (o->roff2)
+					*(unsigned int *) o->roff2 = il;
+				else if (o->off2)
+					val_store(ilp, il, o->off2, 0, data);
+			}
 		}
 		break;
 	}
@@ -403,10 +493,18 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 		if (fn)
 			ret = fn(data);
 		else {
-			if (first)
-				val_store(ilp, 1, o->off1, data);
-			if (!more && o->off2)
-				val_store(ilp, 1, o->off2, data);
+			if (first) {
+				if (o->roff1)
+					*(unsigned int *) o->roff1 = 1;
+				else
+					val_store(ilp, 1, o->off1, 0, data);
+			}
+			if (!more) {
+				if (o->roff2)
+					*(unsigned int *) o->roff2 = 1;
+				else if (o->off2)
+					val_store(ilp, 1, o->off2, 0, data);
+			}
 		}
 		break;
 	}
@@ -418,45 +516,128 @@ static int __handle_option(struct fio_option *o, const char *ptr, void *data,
 		ret = 1;
 	}
 
+	if (ret)
+		return ret;
+
+	if (o->verify) {
+		ret = o->verify(o, data);
+		if (ret) {
+			fprintf(stderr,"Correct format for offending option\n");
+			fprintf(stderr, "%20s: %s\n", o->name, o->help);
+			show_option_help(o, stderr);
+		}
+	}
+
 	return ret;
 }
 
-static int handle_option(struct fio_option *o, const char *ptr, void *data)
+static int handle_option(struct fio_option *o, const char *__ptr, void *data)
 {
-	const char *ptr2 = NULL;
-	int r1, r2;
+	char *o_ptr, *ptr, *ptr2;
+	int ret, done;
+
+	dprint(FD_PARSE, "handle_option=%s, ptr=%s\n", o->name, __ptr);
 
-	dprint(FD_PARSE, "handle_option=%s, ptr=%s\n", o->name, ptr);
+	o_ptr = ptr = NULL;
+	if (__ptr)
+		o_ptr = ptr = strdup(__ptr);
 
 	/*
-	 * See if we have a second set of parameters, hidden after a comma.
-	 * Do this before parsing the first round, to check if we should
+	 * See if we have another set of parameters, hidden after a comma.
+	 * Do this before parsing this round, to check if we should
 	 * copy set 1 options to set 2.
 	 */
-	if (ptr &&
-	    (o->type != FIO_OPT_STR_STORE) &&
-	    (o->type != FIO_OPT_STR)) {
-		ptr2 = strchr(ptr, ',');
-		if (!ptr2)
-			ptr2 = strchr(ptr, ':');
+	done = 0;
+	ret = 1;
+	do {
+		int __ret;
+
+		ptr2 = NULL;
+		if (ptr &&
+		    (o->type != FIO_OPT_STR_STORE) &&
+		    (o->type != FIO_OPT_STR)) {
+			ptr2 = strchr(ptr, ',');
+			if (ptr2 && *(ptr2 + 1) == '\0')
+				*ptr2 = '\0';
+			if (o->type != FIO_OPT_STR_MULTI) {
+				if (!ptr2)
+					ptr2 = strchr(ptr, ':');
+				if (!ptr2)
+					ptr2 = strchr(ptr, '-');
+			}
+		}
+
+		/*
+		 * Don't return early if parsing the first option fails - if
+		 * we are doing multiple arguments, we can allow the first one
+		 * being empty.
+		 */
+		__ret = __handle_option(o, ptr, data, !done, !!ptr2);
+		if (ret)
+			ret = __ret;
+
 		if (!ptr2)
-			ptr2 = strchr(ptr, '-');
+			break;
+
+		ptr = ptr2 + 1;
+		done++;
+	} while (1);
+
+	if (o_ptr)
+		free(o_ptr);
+	return ret;
+}
+
+static struct fio_option *get_option(const char *opt,
+				     struct fio_option *options, char **post)
+{
+	struct fio_option *o;
+	char *ret;
+
+	ret = strchr(opt, '=');
+	if (ret) {
+		*post = ret;
+		*ret = '\0';
+		ret = (char *) opt;
+		(*post)++;
+		strip_blank_end(ret);
+		o = find_option(options, ret);
+	} else {
+		o = find_option(options, opt);
+		*post = NULL;
 	}
 
-	/*
-	 * Don't return early if parsing the first option fails - if
-	 * we are doing multiple arguments, we can allow the first one
-	 * being empty.
-	 */
-	r1 = __handle_option(o, ptr, data, 1, !!ptr2);
+	return o;
+}
 
-	if (!ptr2)
-		return r1;
+static int opt_cmp(const void *p1, const void *p2)
+{
+	struct fio_option *o1, *o2;
+	char *s1, *s2, *foo;
+	int prio1, prio2;
+
+	s1 = strdup(*((char **) p1));
+	s2 = strdup(*((char **) p2));
+
+	o1 = get_option(s1, fio_options, &foo);
+	o2 = get_option(s2, fio_options, &foo);
 
-	ptr2++;
-	r2 = __handle_option(o, ptr2, data, 0, 0);
+	prio1 = prio2 = 0;
+	if (o1)
+		prio1 = o1->prio;
+	if (o2)
+		prio2 = o2->prio;
 
-	return r1 && r2;
+	free(s1);
+	free(s2);
+	return prio2 - prio1;
+}
+
+void sort_options(char **opts, struct fio_option *options, int num_opts)
+{
+	fio_options = options;
+	qsort(opts, num_opts, sizeof(char *), opt_cmp);
+	fio_options = NULL;
 }
 
 int parse_cmd_option(const char *opt, const char *val,
@@ -466,7 +647,7 @@ int parse_cmd_option(const char *opt, const char *val,
 
 	o = find_option(options, opt);
 	if (!o) {
-		fprintf(stderr, "Bad option %s\n", opt);
+		fprintf(stderr, "Bad option <%s>\n", opt);
 		return 1;
 	}
 
@@ -477,28 +658,72 @@ int parse_cmd_option(const char *opt, const char *val,
 	return 1;
 }
 
+/*
+ * Return a copy of the input string with substrings of the form ${VARNAME}
+ * substituted with the value of the environment variable VARNAME.  The
+ * substitution always occurs, even if VARNAME is empty or the corresponding
+ * environment variable undefined.
+ */
+static char *option_dup_subs(const char *opt)
+{
+	char out[OPT_LEN_MAX+1];
+	char in[OPT_LEN_MAX+1];
+	char *outptr = out;
+	char *inptr = in;
+	char *ch1, *ch2, *env;
+	ssize_t nchr = OPT_LEN_MAX;
+	size_t envlen;
+
+	if (strlen(opt) + 1 > OPT_LEN_MAX) {
+		fprintf(stderr, "OPT_LEN_MAX (%d) is too small\n", OPT_LEN_MAX);
+		return NULL;
+	}
+
+	in[OPT_LEN_MAX] = '\0';
+	strncpy(in, opt, OPT_LEN_MAX);
+
+	while (*inptr && nchr > 0) {
+		if (inptr[0] == '$' && inptr[1] == '{') {
+			ch2 = strchr(inptr, '}');
+			if (ch2 && inptr+1 < ch2) {
+				ch1 = inptr+2;
+				inptr = ch2+1;
+				*ch2 = '\0';
+
+				env = getenv(ch1);
+				if (env) {
+					envlen = strlen(env);
+					if (envlen <= nchr) {
+						memcpy(outptr, env, envlen);
+						outptr += envlen;
+						nchr -= envlen;
+					}
+				}
+
+				continue;
+			}
+		}
+
+		*outptr++ = *inptr++;
+		--nchr;
+	}
+
+	*outptr = '\0';
+	return strdup(out);
+}
+
 int parse_option(const char *opt, struct fio_option *options, void *data)
 {
 	struct fio_option *o;
-	char *pre, *post;
-	char *tmp;
-
-	tmp = strdup(opt);
-
-	pre = strchr(tmp, '=');
-	if (pre) {
-		post = pre;
-		*pre = '\0';
-		pre = tmp;
-		post++;
-		o = find_option(options, pre);
-	} else {
-		o = find_option(options, tmp);
-		post = NULL;
-	}
+	char *post, *tmp;
+
+	tmp = option_dup_subs(opt);
+	if (!tmp)
+		return 1;
 
+	o = get_option(tmp, options, &post);
 	if (!o) {
-		fprintf(stderr, "Bad option %s\n", tmp);
+		fprintf(stderr, "Bad option <%s>\n", tmp);
 		free(tmp);
 		return 1;
 	}
@@ -552,29 +777,6 @@ static int string_distance(const char *s1, const char *s2)
 	return i;
 }
 
-static void show_option_help(struct fio_option *o)
-{
-	const char *typehelp[] = {
-		"string (opt=bla)",
-		"string with possible k/m/g postfix (opt=4k)",
-		"string with range and postfix (opt=1k-4k)",
-		"string with time postfix (opt=10s)",
-		"string (opt=bla)",
-		"string with dual range (opt=1k-4k,4k-8k)",
-		"integer value (opt=100)",
-		"boolean value (opt=1)",
-		"no argument (opt)",
-	};
-
-	if (o->alias)
-		printf("%20s: %s\n", "alias", o->alias);
-
-	printf("%20s: %s\n", "type", typehelp[o->type]);
-	printf("%20s: %s\n", "default", o->def ? o->def : "no default");
-	show_option_range(o);
-	show_option_values(o);
-}
-
 static struct fio_option *find_child(struct fio_option *options,
 				     struct fio_option *o)
 {
@@ -635,7 +837,7 @@ static void print_option(struct fio_option *o)
 int show_cmd_help(struct fio_option *options, const char *name)
 {
 	struct fio_option *o, *closest;
-	unsigned int best_dist;
+	unsigned int best_dist = -1U;
 	int found = 0;
 	int show_all = 0;
 
@@ -649,6 +851,8 @@ int show_cmd_help(struct fio_option *options, const char *name)
 
 		if (o->type == FIO_OPT_DEPRECATED)
 			continue;
+		if (!exec_profile && o->prof_name)
+			continue;
 
 		if (name) {
 			if (!strcmp(name, o->name) ||
@@ -668,7 +872,7 @@ int show_cmd_help(struct fio_option *options, const char *name)
 		if (show_all || match) {
 			found = 1;
 			if (match)
-				printf("%24s: %s\n", o->name, o->help);
+				printf("%20s: %s\n", o->name, o->help);
 			if (show_all) {
 				if (!o->parent)
 					print_option(o);
@@ -679,17 +883,22 @@ int show_cmd_help(struct fio_option *options, const char *name)
 		if (!match)
 			continue;
 
-		show_option_help(o);
+		show_option_help(o, stdout);
 	}
 
 	if (found)
 		return 0;
 
 	printf("No such command: %s", name);
-	if (closest) {
+
+	/*
+	 * Only print an appropriately close option, one where the edit
+	 * distance isn't too big. Otherwise we get crazy matches.
+	 */
+	if (closest && best_dist < 3) {
 		printf(" - showing closest match\n");
 		printf("%20s: %s\n", closest->name, closest->help);
-		show_option_help(closest);
+		show_option_help(closest, stdout);
 	} else
 		printf("\n");
 
@@ -710,6 +919,32 @@ void fill_default_options(void *data, struct fio_option *options)
 			handle_option(o, o->def, data);
 }
 
+void option_init(struct fio_option *o)
+{
+	if (o->type == FIO_OPT_DEPRECATED)
+		return;
+	if (o->type == FIO_OPT_BOOL) {
+		o->minval = 0;
+		o->maxval = 1;
+	}
+	if (o->type == FIO_OPT_STR_SET && o->def) {
+		fprintf(stderr, "Option %s: string set option with"
+				" default will always be true\n", o->name);
+	}
+	if (!o->cb && (!o->off1 && !o->roff1)) {
+		fprintf(stderr, "Option %s: neither cb nor offset given\n",
+							o->name);
+	}
+	if (o->type == FIO_OPT_STR || o->type == FIO_OPT_STR_STORE ||
+	    o->type == FIO_OPT_STR_MULTI)
+		return;
+	if (o->cb && ((o->off1 || o->off2 || o->off3 || o->off4) ||
+		      (o->roff1 || o->roff2 || o->roff3 || o->roff4))) {
+		fprintf(stderr, "Option %s: both cb and offset given\n",
+							 o->name);
+	}
+}
+
 /*
  * Sanitize the options structure. For now it just sets min/max for bool
  * values and whether both callback and offsets are given.
@@ -720,27 +955,6 @@ void options_init(struct fio_option *options)
 
 	dprint(FD_PARSE, "init options\n");
 
-	for (o = &options[0]; o->name; o++) {
-		if (o->type == FIO_OPT_DEPRECATED)
-			continue;
-		if (o->type == FIO_OPT_BOOL) {
-			o->minval = 0;
-			o->maxval = 1;
-		}
-		if (o->type == FIO_OPT_STR_SET && o->def) {
-			fprintf(stderr, "Option %s: string set option with"
-					" default will always be true\n",
-						o->name);
-		}
-		if (!o->cb && !o->off1) {
-			fprintf(stderr, "Option %s: neither cb nor offset"
-					" given\n", o->name);
-		}
-		if (o->type == FIO_OPT_STR || o->type == FIO_OPT_STR_STORE)
-			continue;
-		if (o->cb && (o->off1 || o->off2 || o->off3 || o->off4)) {
-			fprintf(stderr, "Option %s: both cb and offset given\n",
-								 o->name);
-		}
-	}
+	for (o = &options[0]; o->name; o++)
+		option_init(o);
 }