diff --git a/readopt.c b/readopt.c
index 2ec2129..8776a4e 100644
--- a/readopt.c
+++ b/readopt.c
@@ -26,9 +26,6 @@ static void permute_val(struct readopt_parser *rp, struct readopt_view_strings *
 static void incr_between(const char **start, const char **stop, struct readopt_view_strings *curr, struct readopt_view_strings *exclude);
 static void permute_rest(const char **target, struct readopt_view_strings start);
 
-static void format_usage_opts(struct readopt_format_context *ctx, struct readopt_opt *opts);
-static void format_usage_opers(struct readopt_format_context *ctx, struct readopt_oper *opers);
-
 int
 readopt_parse(struct readopt_parser *rp)
 {
@@ -419,226 +416,3 @@ readopt_select_lower(struct readopt_bounds bounds)
 {
 	return bounds.inf ? readopt_select_upper(bounds) : bounds.val[0] < bounds.val[1] ? bounds.val[0] : bounds.val[1];
 }
-
-char *
-readopt_keyval(char *s)
-{
-	while (*s != '=') ++s;
-	*s = '\0';
-	return ++s;
-}
-
-int
-readopt_put_error(enum readopt_error e, struct readopt_write_context *ctx)
-{
-	const char *s;
-	switch (e) {
-	case READOPT_ERROR_SUCCESS:   s = "Success"; break;
-	case READOPT_ERROR_NOVAL:     s = "Option did not receive its required value"; break;
-	case READOPT_ERROR_NOTREQ:    s = "No value required for option"; break;
-	case READOPT_ERROR_NOTOPT:    s = "Specified option does not exist"; break;
-	case READOPT_ERROR_RANGEOPT:  s = "Option(s) are not within the defined limits"; break;
-	case READOPT_ERROR_RANGEOPER: s = "Operand(s) are not within the defined limits"; break;
-	default:                       return 0;
-	}
-
-	readopt_write_string(ctx, s);
-	return 1;
-}
-
-void
-readopt_put_usage(struct readopt_parser *rp, struct readopt_format_context *ctx)
-{
-	assert(ctx->fmt == READOPT_FORMAT_MDOC || ctx->fmt == READOPT_FORMAT_PLAIN);
-	ctx->esc.needles = "-";
-	ctx->esc.pre = '\\';
-	format_usage_opts(ctx, rp->opts);
-	format_usage_opers(ctx, rp->opers);
-}
-
-static void
-format_usage_opts(struct readopt_format_context *ctx, struct readopt_opt *opts)
-{
-	int nxvalid = readopt_validate_opt(opts);
-	for (size_t i = 0; nxvalid; i++) {
-		nxvalid = readopt_validate_opt(opts + i + 1);
-		size_t lower = readopt_select_lower(opts[i].cont.oper.bounds);
-		size_t upper = readopt_select_upper(opts[i].cont.oper.bounds);
-		int inf = opts[i].cont.oper.bounds.inf;
-		size_t nforms = sizeof opts[i].names / sizeof *opts[i].names;
-
-		for (size_t j = 0; j < (upper ? upper : !!inf); j++) {
-			readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, '.');
-			if (j >= lower) {
-				readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, "Op ");
-				readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, '[');
-			}
-
-			for (size_t k = 0; k < nforms; k++) {
-				int grp = 0;
-				if (opts[i].names[k]) {
-					for (size_t l = 0; opts[i].names[k][l]; l++) {
-						if (!grp) {
-							readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, "Fl \\&");
-
-							if (k == READOPT_FORM_SHORT) {
-								readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, '-');
-							}
-
-							if (k == READOPT_FORM_LONG) {
-								readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, "\\-");
-								readopt_cond_write_string(READOPT_FORMAT_PLAIN, ctx, "--");
-							}
-						}
-
-						readopt_cond_write_esc_string(READOPT_FORMAT_MDOC, ctx, opts[i].names[k][l]);
-						readopt_cond_write_string(READOPT_FORMAT_PLAIN, ctx, opts[i].names[k][l]);
-
-						if (k == READOPT_FORM_SHORT) {
-							grp = 1;
-							if (!opts[i].names[k][l + 1]) {
-								readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, ' ');
-								readopt_write_string(ctx->wr, ", ");
-							}
-							continue;
-						} else if (k + 1 < nforms || opts[i].names[k][l + 1]) {
-							readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, ' ');
-							readopt_write_string(ctx->wr, ", ");
-						} else {
-							if (opts[i].cont.req){
-								readopt_write_char(ctx->wr, ' ');
-								readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, "Ar ");
-								if (opts[i].cont.oper.name) {
-									readopt_cond_write_esc_string(READOPT_FORMAT_MDOC, ctx, opts[i].cont.oper.name);
-									readopt_cond_write_string(READOPT_FORMAT_PLAIN, ctx, opts[i].cont.oper.name);
-								} else {
-									readopt_write_string(ctx->wr, "value");
-								}
-
-								if (inf) {
-									readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, ' ');
-									readopt_write_string(ctx->wr, "...");
-								}
-							}
-						}
-					}
-				}
-			}
-
-			if (j >= lower) {
-				readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, ']');
-			}
-
-			readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, '\n');
-			readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, ' ');
-		}
-	}
-}
-
-static void
-format_usage_opers(struct readopt_format_context *ctx, struct readopt_oper *opers)
-{
-	int nxvalid = readopt_validate_oper(opers);
-	for (size_t i = 0; nxvalid; i++) {
-		nxvalid = readopt_validate_oper(opers + i + 1);
-		size_t lower = readopt_select_lower(opers[i].bounds);
-		size_t upper = readopt_select_upper(opers[i].bounds);
-		int inf = opers[i].bounds.inf;
-
-		for (size_t j = 0; j < lower; j++) {
-			readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, ".Ar \\&");
-
-			readopt_cond_write_esc_string(READOPT_FORMAT_MDOC, ctx, opers[i].name);
-			readopt_cond_write_string(READOPT_FORMAT_PLAIN, ctx, opers[i].name);
-
-			if (inf && j + 1 == lower) {
-				readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, ' ');
-				readopt_write_string(ctx->wr, "...");
-			}
-
-			if (nxvalid) {
-				readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, ' ');
-			}
-
-			readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, '\n');
-		}
-
-		size_t amt = upper ? upper : inf ? lower + 1 : 0;
-		for (size_t j = lower; j < amt; j++) {
-			readopt_cond_write_string(READOPT_FORMAT_MDOC, ctx, ".Op Ar \\&");
-			readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, '[');
-
-			readopt_cond_write_esc_string(READOPT_FORMAT_MDOC, ctx, opers[i].name);
-			readopt_cond_write_string(READOPT_FORMAT_PLAIN, ctx, opers[i].name);
-
-			if (inf && j + 1 == amt) {
-				readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, ' ');
-				readopt_write_string(ctx->wr, "...");
-			}
-
-			readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, ']');
-
-			if (nxvalid) {
-				readopt_cond_write_char(READOPT_FORMAT_PLAIN, ctx, ' ');
-			}
-
-			readopt_cond_write_char(READOPT_FORMAT_MDOC, ctx, '\n');
-		}
-	}
-}
-
-void
-readopt_cond_write_esc_string(enum readopt_format desired, struct readopt_format_context *ctx, const char *string)
-{
-	if (ctx->fmt == desired) readopt_write_esc_string(ctx, string);
-}
-
-void
-readopt_cond_write_string(enum readopt_format desired, struct readopt_format_context *ctx, const char *string)
-{
-	if (ctx->fmt == desired) readopt_write_string(ctx->wr, string);
-}
-
-void
-readopt_cond_write_char(enum readopt_format desired, struct readopt_format_context *ctx, char ch)
-{
-	if (ctx->fmt == desired) readopt_write_char(ctx->wr, ch);
-}
-
-void
-readopt_write_esc_string(struct readopt_format_context *ctx, const char *string)
-{
-	char *s = (char *)string;
-	for (; *s; ++s) {
-		if (strchr(ctx->esc.needles, *s) && *s) {
-			readopt_write_char(ctx->wr, ctx->esc.pre);
-		}
-		readopt_write_char(ctx->wr, *s);
-	}
-}
-
-void
-readopt_write_string(struct readopt_write_context *ctx, const char *string)
-{
-	ctx->src.len = strlen(string);
-	ctx->src.payload = string;
-	readopt_write_stream(ctx);
-}
-
-void
-readopt_write_char(struct readopt_write_context *ctx, char ch)
-{
-	ctx->src.len = sizeof (ch);
-	ctx->src.payload = &ch;
-	readopt_write_stream(ctx);
-}
-
-void
-readopt_write_stream(struct readopt_write_context *ctx)
-{
-	while (ctx->callback && (ctx->src.len > ctx->dest.size || !ctx->dest.stream))
-		if (!ctx->callback(ctx))
-			return;
-
-	ctx->written += fwrite(ctx->src.payload, ctx->src.len, 1, ctx->dest.stream);
-}
diff --git a/readopt.h b/readopt.h
index 8bd183c..fc0cf05 100644
--- a/readopt.h
+++ b/readopt.h
@@ -115,18 +115,3 @@ int readopt_validate_within(struct readopt_oper *oper);
 size_t readopt_select_upper(struct readopt_bounds bounds);
 /* get the lower limit (this does not always return the minimum, if e.g. .val is {0, 1} and inf != 0, then 1 will be considered the lower limit as well as the upper limit) */
 size_t readopt_select_lower(struct readopt_bounds bounds);
-/* pass a string like "thing=value" and get "value" back */
-char *readopt_keyval(char *s);
-
-/* write the passed error as a string via ctx */
-int readopt_put_error(enum readopt_error error, struct readopt_write_context *ctx);
-/* write the usage string, either as plaintext or mdoc format */
-void readopt_put_usage(struct readopt_parser *rp, struct readopt_format_context *ctx);
-
-void readopt_write_stream(struct readopt_write_context *ctx);
-void readopt_write_string(struct readopt_write_context *ctx, const char *string);
-void readopt_write_char(struct readopt_write_context *ctx, char ch);
-void readopt_cond_write_string(enum readopt_format desired, struct readopt_format_context *ctx, const char *string);
-void readopt_cond_write_char(enum readopt_format desired, struct readopt_format_context *ctx, char ch);
-void readopt_write_esc_string(struct readopt_format_context *ctx, const char *string);
-void readopt_cond_write_esc_string(enum readopt_format desired, struct readopt_format_context *ctx, const char *string);