created skeleton.

2 files changed, 1084 insertions, 0 deletions

diff --git a/src/internal/argv/argv.h b/src/internal/argv/argv.h
new file mode 100644
index 0000000..4f037fb
--- /dev/null
+++ b/src/internal/argv/argv.h
@@ -0,0 +1,1053 @@
+/****************************************************************************/
+/*  argv.h: a thread-safe argument vector parser and usage screen generator */
+/*  Copyright (C) 2015--2016  Z. Gilboa                                     */
+/*  Released under the Standard MIT License; see COPYING.SOFORT.            */
+/*  This file is (also) part of sofort: portable software project template. */
+/****************************************************************************/
+
+#ifndef ARGV_H
+#define ARGV_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define ARGV_VERBOSITY_NONE		0x00
+#define ARGV_VERBOSITY_ERRORS		0x01
+#define ARGV_VERBOSITY_STATUS		0x02
+#define ARGV_CLONE_VECTOR		0x80
+
+#ifndef ARGV_TAB_WIDTH
+#define ARGV_TAB_WIDTH			8
+#endif
+
+/*******************************************/
+/*                                         */
+/* support of hybrid options               */
+/* -------------------------               */
+/* hybrid options are very similar to      */
+/* long options, yet are prefixed by       */
+/* a single dash rather than two           */
+/* (i.e. -std, -isystem).                  */
+/* hybrid options are supported by this    */
+/* driver for compatibility with legacy    */
+/* tools; note, however, that the use      */
+/* of hybrid options should be strongly    */
+/* discouraged due to the limitations      */
+/* they impose on short options (for       */
+/* example, a driver implementing -std     */
+/* may not provide -s as a short option    */
+/* that takes an arbitrary value).         */
+/*                                         */
+/* SPACE: -hybrid VALUE (i.e. -MF file)    */
+/* EQUAL: -hybrid=VALUE (i.e. -std=c99)    */
+/* COMMA: -hybrid,VALUE (i.e. -Wl,<arg>)   */
+/* ONLY:  -opt accepted, --opt rejected    */
+/* JOINED: -optVALUE                       */
+/*                                         */
+/*******************************************/
+
+
+#define ARGV_OPTION_HYBRID_NONE		0x00
+#define ARGV_OPTION_HYBRID_ONLY		0x01
+#define ARGV_OPTION_HYBRID_SPACE	0x02
+#define ARGV_OPTION_HYBRID_EQUAL	0x04
+#define ARGV_OPTION_HYBRID_COMMA	0x08
+#define ARGV_OPTION_HYBRID_JOINED	0x10
+#define ARGV_OPTION_HYBRID_CIRCUS	(ARGV_OPTION_HYBRID_SPACE \
+					| ARGV_OPTION_HYBRID_JOINED)
+#define ARGV_OPTION_HYBRID_DUAL		(ARGV_OPTION_HYBRID_SPACE \
+					| ARGV_OPTION_HYBRID_EQUAL)
+#define ARGV_OPTION_HYBRID_SWITCH	(ARGV_OPTION_HYBRID_SPACE \
+					| ARGV_OPTION_HYBRID_EQUAL \
+					| ARGV_OPTION_HYBRID_COMMA \
+					| ARGV_OPTION_HYBRID_JOINED)
+
+enum argv_optarg {
+	ARGV_OPTARG_NONE,
+	ARGV_OPTARG_REQUIRED,
+	ARGV_OPTARG_OPTIONAL,
+};
+
+enum argv_mode {
+	ARGV_MODE_SCAN,
+	ARGV_MODE_COPY,
+};
+
+enum argv_error {
+	ARGV_ERROR_OK,
+	ARGV_ERROR_INTERNAL,
+	ARGV_ERROR_SHORT_OPTION,
+	ARGV_ERROR_LONG_OPTION,
+	ARGV_ERROR_OPTARG_NONE,
+	ARGV_ERROR_OPTARG_REQUIRED,
+	ARGV_ERROR_OPTARG_PARADIGM,
+	ARGV_ERROR_HYBRID_NONE,
+	ARGV_ERROR_HYBRID_ONLY,
+	ARGV_ERROR_HYBRID_SPACE,
+	ARGV_ERROR_HYBRID_EQUAL,
+	ARGV_ERROR_HYBRID_COMMA,
+};
+
+struct argv_option {
+	const char *		long_name;
+	const char		short_name;
+	int			tag;
+	enum argv_optarg	optarg;
+	int			flags;
+	const char *		paradigm;
+	const char *		argname;
+	const char *		description;
+};
+
+struct argv_entry {
+	const char *	arg;
+	int		tag;
+	bool		fopt;
+	bool		fval;
+	bool		fnoscan;
+	enum argv_error errcode;
+};
+
+struct argv_meta {
+	char **			argv;
+	struct argv_entry *	entries;
+};
+
+struct argv_meta_impl {
+	char **			argv;
+	char *			strbuf;
+	struct argv_meta	meta;
+};
+
+struct argv_ctx {
+	int				flags;
+	int				mode;
+	int				nentries;
+	int				unitidx;
+	int				erridx;
+	enum argv_error 		errcode;
+	const char *			errch;
+	const struct argv_option *	erropt;
+	const char *			program;
+};
+
+#ifdef ARGV_DRIVER
+
+static const char * argv_program_name(const char *);
+
+static void argv_usage(
+	FILE *,
+	const char *	header,
+	const struct	argv_option[],
+	const char *	mode);
+
+static struct argv_meta * argv_get(
+	char **,
+	const struct argv_option[],
+	int flags);
+
+static void argv_free(struct argv_meta *);
+
+
+
+
+/*------------------------------------*/
+/* implementation of static functions */
+/*------------------------------------*/
+
+static const struct argv_option * argv_short_option(
+	const char *			ch,
+	const struct argv_option	options[],
+	struct argv_entry *		entry)
+{
+	const struct argv_option *	option;
+
+	for (option=options; option->long_name || option->short_name; option++) {
+		if (option->short_name == *ch) {
+			entry->tag	= option->tag;
+			entry->fopt	= true;
+			return option;
+		}
+	}
+
+	return 0;
+}
+
+static const struct argv_option * argv_long_option(
+	const char *			ch,
+	const struct argv_option	options[],
+	struct argv_entry *		entry)
+{
+	const struct argv_option *	option;
+	const char *			arg;
+	size_t				len;
+
+	for (option=options; option->long_name || option->short_name; option++) {
+		len = option->long_name ? strlen(option->long_name) : 0;
+
+		if (len && !(strncmp(option->long_name,ch,len))) {
+			arg = ch + len;
+
+			if (!*arg
+				|| (*arg == '=')
+				|| (option->flags & ARGV_OPTION_HYBRID_JOINED)
+				|| ((option->flags & ARGV_OPTION_HYBRID_COMMA)
+					&& (*arg == ','))) {
+				entry->tag	= option->tag;
+				entry->fopt	= true;
+				return option;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static inline bool is_short_option(const char * arg)
+{
+	return (arg[0]=='-') && arg[1] && (arg[1]!='-');
+}
+
+static inline bool is_long_option(const char * arg)
+{
+	return (arg[0]=='-') && (arg[1]=='-') && arg[2];
+}
+
+static inline bool is_last_option(const char * arg)
+{
+	return (arg[0]=='-') && (arg[1]=='-') && !arg[2];
+}
+
+static inline bool is_hybrid_option(
+	const char *			arg,
+	const struct argv_option	options[])
+{
+	const struct argv_option *	option;
+	struct argv_entry		entry;
+
+	if (!is_short_option(arg))
+		return false;
+
+	if (!(option = argv_long_option(++arg,options,&entry)))
+		return false;
+
+	if (!(option->flags & ARGV_OPTION_HYBRID_SWITCH))
+		if (argv_short_option(arg,options,&entry))
+			return false;
+
+	return true;
+}
+
+static inline bool is_arg_in_paradigm(const char * arg, const char * paradigm)
+{
+	size_t		len;
+	const char *	ch;
+
+	for (ch=paradigm,len=strlen(arg); ch; ) {
+		if (!strncmp(arg,ch,len)) {
+			if (!*(ch += len))
+				return true;
+			else if (*ch == '|')
+				return true;
+		}
+
+		if ((ch = strchr(ch,'|')))
+			ch++;
+	}
+
+	return false;
+}
+
+static inline const struct argv_option * option_from_tag(
+	const struct argv_option	options[],
+	int				tag)
+{
+	const struct argv_option *	option;
+
+	for (option=options; option->short_name || option->long_name; option++)
+		if (option->tag == tag)
+			return option;
+	return 0;
+}
+
+static void argv_scan(
+	char **				argv,
+	const struct argv_option	options[],
+	struct argv_ctx *		ctx,
+	struct argv_meta *		meta)
+{
+	char **				parg;
+	const char *			ch;
+	const char *			val;
+	const struct argv_option *	option;
+	struct argv_entry		entry;
+	struct argv_entry *		mentry;
+	enum argv_error			ferr;
+	bool				fval;
+	bool				fnext;
+	bool				fshort;
+	bool				fhybrid;
+	bool				fnoscan;
+
+	parg	= &argv[1];
+	ch	= *parg;
+	ferr	= ARGV_ERROR_OK;
+	fshort	= false;
+	fnoscan	= false;
+	fval	= false;
+	mentry	= meta ? meta->entries : 0;
+
+	ctx->unitidx = 0;
+	ctx->erridx  = 0;
+
+	while (ch && (ferr == ARGV_ERROR_OK)) {
+		option  = 0;
+		fhybrid = false;
+
+		if (fnoscan)
+			fval = true;
+
+		else if (is_last_option(ch))
+			fnoscan = true;
+
+		else if (!fshort && is_hybrid_option(ch,options))
+			fhybrid = true;
+
+		if (!fnoscan && !fhybrid && (fshort || is_short_option(ch))) {
+			if (!fshort)
+				ch++;
+
+			if ((option = argv_short_option(ch,options,&entry))) {
+				if (ch[1]) {
+					ch++;
+					fnext	= false;
+					fshort	= (option->optarg == ARGV_OPTARG_NONE);
+				} else {
+					parg++;
+					ch	= *parg;
+					fnext	= true;
+					fshort	= false;
+				}
+
+				if (option->optarg == ARGV_OPTARG_NONE) {
+					if (!fnext && ch && (*ch == '-'))
+						ferr = ARGV_ERROR_OPTARG_NONE;
+					else
+						fval = false;
+				} else if (!fnext)
+					fval = true;
+				else if (option->optarg == ARGV_OPTARG_REQUIRED) {
+					if (ch && is_short_option(ch))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (ch && is_long_option(ch))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (ch && is_last_option(ch))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (ch)
+						fval = true;
+					else
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+				} else {
+					/* ARGV_OPTARG_OPTIONAL */
+					if (ch && is_short_option(ch))
+						fval = false;
+					else if (ch && is_long_option(ch))
+						fval = false;
+					else if (ch && is_last_option(ch))
+						fval = false;
+					else
+						fval = ch;
+				}
+			} else
+				ferr = ARGV_ERROR_SHORT_OPTION;
+
+		} else if (!fnoscan && (fhybrid || is_long_option(ch))) {
+			ch += (fhybrid ? 1 : 2);
+
+			if ((option = argv_long_option(ch,options,&entry))) {
+				val = ch + strlen(option->long_name);
+
+				/* val[0] is either '=' (or ',') or '\0' */
+				if (!val[0]) {
+					parg++;
+					ch = *parg;
+				}
+
+				if (fhybrid && !(option->flags & ARGV_OPTION_HYBRID_SWITCH))
+					ferr = ARGV_ERROR_HYBRID_NONE;
+				else if (option->optarg == ARGV_OPTARG_NONE) {
+					if (val[0]) {
+						ferr = ARGV_ERROR_OPTARG_NONE;
+						ctx->errch = val + 1;
+					} else
+						fval = false;
+				} else if (!fhybrid && (option->flags & ARGV_OPTION_HYBRID_ONLY))
+					ferr = ARGV_ERROR_HYBRID_ONLY;
+				else if (val[0] && (option->flags & ARGV_OPTION_HYBRID_JOINED)) {
+					fval = true;
+					ch   = val;
+				} else if (fhybrid && !val[0] && !(option->flags & ARGV_OPTION_HYBRID_SPACE))
+					ferr = ARGV_ERROR_HYBRID_SPACE;
+				else if (fhybrid && (val[0]=='=') && !(option->flags & ARGV_OPTION_HYBRID_EQUAL))
+					ferr = ARGV_ERROR_HYBRID_EQUAL;
+				else if (fhybrid && (val[0]==',') && !(option->flags & ARGV_OPTION_HYBRID_COMMA))
+					ferr = ARGV_ERROR_HYBRID_COMMA;
+				else if (!fhybrid && (val[0]==','))
+					ferr = ARGV_ERROR_HYBRID_COMMA;
+				else if (val[0] && !val[1])
+					ferr = ARGV_ERROR_OPTARG_REQUIRED;
+				else if (val[0] && val[1]) {
+					fval = true;
+					ch   = ++val;
+				} else if (option->optarg == ARGV_OPTARG_REQUIRED) {
+					if (!val[0] && !*parg)
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (*parg && is_short_option(*parg))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (*parg && is_long_option(*parg))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else if (*parg && is_last_option(*parg))
+						ferr = ARGV_ERROR_OPTARG_REQUIRED;
+					else
+						fval = true;
+				} else {
+					/* ARGV_OPTARG_OPTIONAL */
+					fval = val[0];
+				}
+			} else
+				ferr = ARGV_ERROR_LONG_OPTION;
+		}
+
+		if (ferr == ARGV_ERROR_OK)
+			if (option && fval && option->paradigm)
+				if (!is_arg_in_paradigm(ch,option->paradigm))
+					ferr = ARGV_ERROR_OPTARG_PARADIGM;
+
+		if (ferr == ARGV_ERROR_OK)
+			if (!option && !ctx->unitidx)
+				ctx->unitidx = parg - argv;
+
+		if (ferr != ARGV_ERROR_OK) {
+			ctx->errcode = ferr;
+			ctx->errch   = ctx->errch ? ctx->errch : ch;
+			ctx->erropt  = option;
+			ctx->erridx  = parg - argv;
+			return;
+		} else if (ctx->mode == ARGV_MODE_SCAN) {
+			if (!fnoscan)
+				ctx->nentries++;
+			else if (fval)
+				ctx->nentries++;
+
+			if (fval || !option) {
+				parg++;
+				ch = *parg;
+			}
+		} else if (ctx->mode == ARGV_MODE_COPY) {
+			if (fnoscan) {
+				if (fval) {
+					mentry->arg	= ch;
+					mentry->fnoscan = true;
+					mentry++;
+				}
+
+				parg++;
+				ch = *parg;
+			} else if (option) {
+				mentry->arg	= fval ? ch : 0;
+				mentry->tag	= option->tag;
+				mentry->fopt	= true;
+				mentry->fval	= fval;
+				mentry++;
+
+				if (fval) {
+					parg++;
+					ch = *parg;
+				}
+			} else {
+				mentry->arg = ch;
+				mentry++;
+				parg++;
+				ch = *parg;
+			}
+		}
+	}
+}
+
+static const char * argv_program_name(const char * program_path)
+{
+	const char * ch;
+
+	if (program_path) {
+		if ((ch = strrchr(program_path,'/')))
+			return *(++ch) ? ch : 0;
+
+		if ((ch = strrchr(program_path,'\\')))
+			return *(++ch) ? ch : 0;
+	}
+
+	return program_path;
+}
+
+static void argv_show_error(struct argv_ctx * ctx)
+{
+	fprintf(stderr,"%s: error: ",ctx->program);
+
+	switch (ctx->errcode) {
+		case ARGV_ERROR_SHORT_OPTION:
+			fprintf(stderr,"'-%c' is not a valid short option\n",*ctx->errch);
+			break;
+
+		case ARGV_ERROR_LONG_OPTION:
+			fprintf(stderr,"'--%s' is not a valid long option\n",ctx->errch);
+			break;
+
+		case ARGV_ERROR_OPTARG_NONE:
+			fprintf(stderr,"'%s' is not a valid option value for [%s%c%s%s%s] "
+					"(option values may not be specified)\n",
+				ctx->errch,
+				ctx->erropt->short_name ? "-" : "",
+				ctx->erropt->short_name,
+				ctx->erropt->short_name ? "," : "",
+				ctx->erropt->long_name ? "--" : "",
+				ctx->erropt->long_name);
+			break;
+
+		case ARGV_ERROR_OPTARG_REQUIRED:
+			fprintf(stderr,"option [%s%c%s%s%s] requires %s %s%s%s\n",
+				ctx->erropt->short_name ? "-" : "",
+				ctx->erropt->short_name,
+				ctx->erropt->short_name ? "," : "",
+				ctx->erropt->long_name ? "--" : "",
+				ctx->erropt->long_name,
+				ctx->erropt->paradigm ? "one of the following values:" : "a value",
+				ctx->erropt->paradigm ? "{" : "",
+				ctx->erropt->paradigm ? ctx->erropt->paradigm : "",
+				ctx->erropt->paradigm ? "}" : "");
+			break;
+
+		case ARGV_ERROR_OPTARG_PARADIGM:
+			fprintf(stderr,"'%s' is not a valid option value for [%s%c%s%s%s]={%s}\n",
+				ctx->errch,
+				ctx->erropt->short_name ? "-" : "",
+				ctx->erropt->short_name,
+				ctx->erropt->short_name ? "," : "",
+				ctx->erropt->long_name ? "--" : "",
+				ctx->erropt->long_name,
+				ctx->erropt->paradigm);
+			break;
+
+		case ARGV_ERROR_HYBRID_NONE:
+			fprintf(stderr,"-%s is not a synonym for --%s\n",
+				ctx->erropt->long_name,
+				ctx->erropt->long_name);
+			break;
+
+		case ARGV_ERROR_HYBRID_ONLY:
+			fprintf(stderr,"--%s is not a synonym for -%s\n",
+				ctx->erropt->long_name,
+				ctx->erropt->long_name);
+			break;
+
+		case ARGV_ERROR_HYBRID_SPACE:
+		case ARGV_ERROR_HYBRID_EQUAL:
+		case ARGV_ERROR_HYBRID_COMMA:
+			fprintf(stderr,"-%s: illegal value assignment; valid syntax is "
+					"-%s%sVAL\n",
+				ctx->erropt->long_name,
+				ctx->erropt->long_name,
+				(ctx->erropt->flags & ARGV_OPTION_HYBRID_SPACE)
+					? " " : (ctx->erropt->flags & ARGV_OPTION_HYBRID_EQUAL)
+					? "=" : (ctx->erropt->flags & ARGV_OPTION_HYBRID_COMMA)
+					? "," : "");
+
+			break;
+
+		case ARGV_ERROR_INTERNAL:
+			fputs("internal error",stderr);
+			break;
+
+		default:
+			break;
+	}
+}
+
+static void argv_show_status(
+	const struct argv_option	options[],
+	struct argv_ctx *		ctx,
+	struct argv_meta *		meta)
+{
+	int				argc;
+	char **				argv;
+	struct argv_entry *		entry;
+	const struct argv_option *	option;
+	char				short_name[2] = {0};
+	const char *			space = "";
+
+	fputs("\n\nconcatenated command line:\n",stderr);
+	for (argv=meta->argv; *argv; argv++) {
+		fprintf(stderr,"%s%s",space,*argv);
+		space = " ";
+	}
+
+	fputs("\n\nargument vector:\n",stderr);
+	for (argc=0,argv=meta->argv; *argv; argc++,argv++)
+		fprintf(stderr,"argv[%d]: %s\n",argc,*argv);
+
+	fputs("\n\nparsed entries:\n",stderr);
+	for (entry=meta->entries; entry->arg || entry->fopt; entry++)
+		if (entry->fopt) {
+			option = option_from_tag(options,entry->tag);
+			short_name[0] = option->short_name;
+
+			if (entry->fval)
+				fprintf(stderr,"[-%s,--%s] := %s\n",
+					short_name,option->long_name,entry->arg);
+			else
+				fprintf(stderr,"[-%s,--%s]\n",
+					short_name,option->long_name);
+		} else
+			fprintf(stderr,"<program arg> := %s\n",entry->arg);
+
+	fputs("\n\n",stderr);
+}
+
+static struct argv_meta * argv_free_impl(struct argv_meta_impl * imeta)
+{
+	if (imeta->argv)
+		free(imeta->argv);
+
+	if (imeta->strbuf)
+		free(imeta->strbuf);
+
+	if (imeta->meta.entries)
+		free(imeta->meta.entries);
+
+	free(imeta);
+	return 0;
+}
+
+static struct argv_meta * argv_alloc(char ** argv, struct argv_ctx * ctx)
+{
+	struct argv_meta_impl * imeta;
+	char **			vector;
+	char *			dst;
+	size_t			size;
+	int			argc;
+	int			i;
+
+	if (!(imeta = calloc(1,sizeof(*imeta))))
+		return 0;
+
+	if (ctx->flags & ARGV_CLONE_VECTOR) {
+		for (vector=argv,argc=0,size=0; *vector; vector++) {
+			size += strlen(*vector) + 1;
+			argc++;
+		}
+
+		if (!(imeta->argv = calloc(argc+1,sizeof(char *))))
+			return argv_free_impl(imeta);
+		else if (!(imeta->strbuf = calloc(1,size+1)))
+			return argv_free_impl(imeta);
+
+		for (i=0,dst=imeta->strbuf; i<argc; i++) {
+			strcpy(dst,argv[i]);
+			imeta->argv[i] = dst;
+			dst += strlen(dst)+1;
+		}
+
+		imeta->meta.argv = imeta->argv;
+	} else
+		imeta->meta.argv = argv;
+
+	if (!(imeta->meta.entries = calloc(
+				ctx->nentries+1,
+				sizeof(struct argv_entry))))
+		return argv_free_impl(imeta);
+	else
+		return &imeta->meta;
+}
+
+static struct argv_meta * argv_get(
+	char *				argv[],
+	const struct argv_option	options[],
+	int				flags)
+{
+	struct argv_meta *	meta;
+	struct argv_ctx		ctx = {flags,ARGV_MODE_SCAN,0,0,0,0,0,0,0};
+
+	argv_scan(argv,options,&ctx,0);
+
+	if (ctx.errcode != ARGV_ERROR_OK) {
+		if (!ctx.program)
+			ctx.program = argv_program_name(argv[0]);
+
+		if (ctx.flags & ARGV_VERBOSITY_ERRORS)
+			argv_show_error(&ctx);
+
+		return 0;
+	}
+
+	if (!(meta = argv_alloc(argv,&ctx)))
+		return 0;
+
+	ctx.mode = ARGV_MODE_COPY;
+	argv_scan(meta->argv,options,&ctx,meta);
+
+	if (ctx.errcode != ARGV_ERROR_OK) {
+		if (!ctx.program)
+			ctx.program = argv[0];
+
+		ctx.errcode = ARGV_ERROR_INTERNAL;
+		argv_show_error(&ctx);
+		argv_free(meta);
+
+		return 0;
+	}
+
+	if (ctx.flags & ARGV_VERBOSITY_STATUS)
+		argv_show_status(options,&ctx,meta);
+
+	return meta;
+}
+
+static void argv_free(struct argv_meta * xmeta)
+{
+	struct argv_meta_impl * imeta;
+	uintptr_t		addr;
+
+	if (xmeta) {
+		addr  = (uintptr_t)xmeta - offsetof(struct argv_meta_impl,meta);
+		imeta = (struct argv_meta_impl *)addr;
+		argv_free_impl(imeta);
+	}
+}
+
+static void argv_usage(
+	FILE *				file,
+	const char *    		header,
+	const struct argv_option	options[],
+	const char *			mode)
+{
+	const struct argv_option *	option;
+	bool				fshort,flong;
+	bool				fnewline;
+	size_t				len,optlen;
+	size_t				paralen,rparalen,mparalen;
+	size_t				desclen,rdesclen;
+
+	char *				para;
+	char *				next_para;
+	char *				desc;
+	char *				next_desc;
+	char *				paradigm;
+	char *				buf;
+	size_t				buflen;
+	const char *			sdescription;
+	const char *			sargname;
+
+	const char			indent[] = "  ";
+	const int			rblen  = sizeof("}") - sizeof(char);
+	const int			rbblen = sizeof("{]") - sizeof(char);
+	const int			brcklen= sizeof("[]") - sizeof(char);
+	const int			solen  = sizeof("-") - sizeof(char);
+	const int			lolen  = sizeof("--") - sizeof(char);
+	const int			slolen = sizeof("-X,--") - sizeof(char);
+
+	fshort = mode ? !strcmp(mode,"short") : 0;
+	flong  = fshort ? 0 : mode && !strcmp(mode,"long");
+
+	if (header)
+		fprintf(stdout,"%s",header);
+
+	optlen  = 0;
+	paralen = 0;
+
+	for (option=options; option->short_name || option->long_name; option++) {
+		if (fshort)
+			len = option->short_name ? sizeof(char) + solen : 0;
+		else if (flong)
+			len = option->long_name ? strlen(option->long_name) + lolen : 0;
+		else
+			len = option->long_name ? strlen(option->long_name) + slolen : 0;
+
+		if (len) {
+			if (len > optlen)
+				optlen = len;
+
+			if (option->argname)
+				len = strlen(option->argname);
+			else if (option->paradigm)
+				len = strlen(option->paradigm) + strlen("{}");
+			else if (option->optarg != ARGV_OPTARG_NONE)
+				len = strlen("<val>");
+
+			if (option->optarg == ARGV_OPTARG_OPTIONAL)
+				len += strlen("[]");
+
+			if (len > paralen)
+				paralen = len;
+		}
+	}
+
+	optlen += ARGV_TAB_WIDTH;
+	optlen &= (~(ARGV_TAB_WIDTH-1));
+
+	paradigm = next_para = buf = 0;
+	fnewline = false;
+	rparalen = 0;
+	mparalen = 0;
+
+	if (paralen) {
+		paralen += (ARGV_TAB_WIDTH);
+		paralen &= (~(ARGV_TAB_WIDTH-1));
+		mparalen = paralen + 2*rbblen;
+
+		if (optlen + paralen > 64)
+			paralen = 32;
+	}
+
+	/* account for '  ','\t', try to fit in 80 or 96 columns */
+	if (optlen+paralen+2+ARGV_TAB_WIDTH < 80-32)
+		desclen = 80 - (optlen+paralen+2+ARGV_TAB_WIDTH);
+	else if (optlen+paralen+2+ARGV_TAB_WIDTH < 96-32)
+		desclen = 96 - (optlen+paralen+2+ARGV_TAB_WIDTH);
+	else
+		desclen = 32;
+
+	buflen   = 0;
+	rdesclen = 1;
+
+	for (option=options; option->short_name || option->long_name; option++) {
+		if (fshort && !option->short_name)
+			continue;
+		else if (flong && !option->long_name)
+			continue;
+
+		if (option->paradigm) {
+			if (option->optarg == ARGV_OPTARG_OPTIONAL)
+				rparalen = strlen(option->paradigm) - 2*rbblen;
+			else
+				rparalen = strlen(option->paradigm) - 2*rblen;
+		}
+
+		sdescription 	= option->description ? option->description : "";
+		sargname	= option->argname ? option->argname : "";
+
+		if (option->paradigm)
+			rdesclen = snprintf(buf,buflen,sdescription,option->paradigm);
+		else
+			rdesclen = snprintf(buf,buflen,sdescription,sargname);
+
+		if (fnewline)
+			(void)0;
+
+		if ((rparalen > paralen) || (rdesclen > desclen)) {
+			if (!fnewline) {
+				(void)0;
+				fnewline = true;
+			}
+		} else
+			fnewline = false;
+
+		if (fshort)
+			fprintf(file,"%s-%-*c",indent,(int)(optlen-solen),option->short_name);
+		else if (flong)
+			fprintf(file,
+				(option->flags & ARGV_OPTION_HYBRID_ONLY)
+					? "%s -%-*s"
+					: "%s--%-*s",
+				indent,(int)(optlen-lolen),option->long_name);
+		else {
+			if (option->short_name && option->long_name)
+				fprintf(file,
+					(option->flags & ARGV_OPTION_HYBRID_ONLY)
+						? "%s-%c, -%-*s"
+						: "%s-%c,--%-*s",
+					indent,option->short_name,
+					(int)(optlen-slolen),option->long_name);
+			else if (option->short_name)
+				 fprintf(file,"%s-%-*c",
+					indent,(int)(optlen-solen),option->short_name);
+			else
+				fprintf(file,
+					(option->flags & ARGV_OPTION_HYBRID_ONLY)
+						? "%s%3s -%-*s"
+						: "%s%3s--%-*s",
+					indent,"",
+					(int)(optlen-slolen),option->long_name);
+		}
+
+		if (rdesclen > buflen) {
+			if (buf) {
+				free(buf);
+				buf = 0;
+			}
+
+			len =  rdesclen + 512;
+			len &= (~511);
+
+			if ((buf = calloc(1,len))) {
+				buflen = len;
+
+				if (option->paradigm)
+					rdesclen = snprintf(buf,buflen,
+							option->description,
+							option->paradigm);
+				else
+					rdesclen = snprintf(buf,buflen,
+							option->description,
+							option->argname);
+			} else {
+				buflen = 0;
+				continue;
+			}
+		}
+
+		if (option->argname) {
+			if (option->optarg == ARGV_OPTARG_OPTIONAL)
+				fprintf(file,"[%s]%-*c",
+					option->argname,
+					(int)(paralen-strlen(option->argname)-brcklen),' ');
+			else
+				fprintf(file,"%s%-*c",
+					option->argname,
+					(int)(paralen-strlen(option->argname)),' ');
+			para = (char *)0;
+		} else if (option->paradigm && (rparalen <= paralen)) {
+			if (option->optarg == ARGV_OPTARG_OPTIONAL)
+				fprintf(file,"[{%s}]%-*c",
+					option->paradigm,
+					(int)(paralen-strlen(option->paradigm)-2*rbblen),' ');
+			else
+				fprintf(file,"{%s}%-*c",
+					option->paradigm,
+					(int)(paralen-strlen(option->paradigm)-rbblen),' ');
+			para = (char *)0;
+		} else if (option->paradigm) {
+			if (!paradigm && !(paradigm = calloc(1,mparalen))) {
+				fputc('\n',file);
+				continue;
+			} else
+				para = strcpy(paradigm,option->paradigm);
+
+			if (option->optarg == ARGV_OPTARG_OPTIONAL) {
+				fputs("[{",file);
+				rparalen = paralen - rbblen;
+			} else {
+				fputc('{',file);
+				rparalen = paralen - rblen;
+			}
+		} else {
+			fprintf(file,"%-*c",(int)paralen,' ');
+			para = (char *)0;
+		}
+
+
+		if (!para && option->description && rdesclen <= desclen) {
+			fputc('\t',file);
+			fputs(buf,file);
+			desc = (char *)0;
+		} else if (option->description)
+			desc = buf;
+		else
+			desc = (char *)0;
+
+		while (para || desc) {
+			if (para) {
+				next_para = para+rparalen-1;
+
+				for (; (next_para>para) && (*next_para!='|'); )
+					next_para--;
+
+				if (para > paradigm) {
+					if (option->optarg == ARGV_OPTARG_OPTIONAL)
+						fputs("  ",file);
+					else
+						fputc(' ',file);
+				}
+
+				if (*next_para != '|') {
+					fprintf(file,"%s",para);
+					para = (char *)0;
+				} else if (next_para > para) {
+					*next_para = '\0';
+					fprintf(file,"%-*s",(int)rparalen,para);
+					*next_para = '|';
+					para = next_para;
+					rparalen = strlen(para);
+
+					/* 2*rbblen,2*rblen, etc.: account for indentation */
+					if (option->optarg == ARGV_OPTARG_OPTIONAL)
+						rparalen = (rparalen+2*rbblen > paralen)
+								? paralen-rbblen
+								: rparalen;
+					else
+						rparalen = (rparalen+2*rblen > paralen)
+								? paralen-rblen
+								: rparalen;
+				} else {
+					if (option->optarg == ARGV_OPTARG_OPTIONAL)
+						fprintf(file,"%s}]%-*c",para,
+							(int)(paralen-strlen(para)-rbblen),' ');
+					else
+						fprintf(file,"%s}%-*c",para,
+							(int)(paralen-strlen(para)-rblen),' ');
+					para = (char *)0;
+				}
+			} else if (desc > buf)
+				fprintf(file,"%-*c",(int)paralen,' ');
+
+			if (desc) {
+				if (desc > buf)
+					fputs("\t ",file);
+				else
+					fputc('\t',file);
+
+				if ((rdesclen = strlen(desc)+(desc>buf)) <= desclen) {
+					fputs(desc,file);
+					desc = (char *)0;
+				} else {
+					next_desc = desc + desclen - 1;
+
+					for (; (next_desc > desc)
+							&& (*next_desc != ' ')
+							&& (*next_desc != '\n'); )
+						next_desc--;
+
+					if ((*next_desc != ' ') && (*next_desc!='\n')) {
+						fputs(desc,file);
+						desc = (char *)0;
+					} else if (next_desc > desc) {
+						*next_desc = '\0';
+						fputs(desc,file);
+						desc = ++next_desc;
+					} else {
+						fputs(desc,file);
+						desc = (char *)0;
+					}
+				}
+			}
+
+			if (para || desc)
+				fprintf(file,"\n%s%-*c",indent,(int)optlen,' ');
+		}
+
+		fputc('\n',file);
+	}
+
+	if (paradigm)
+		free(paradigm);
+
+	if (buf)
+		free(buf);
+}
+
+#endif
+
+#endif
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
new file mode 100644
index 0000000..d8e3111
--- /dev/null
+++ b/src/internal/slibtool_driver_impl.h
@@ -0,0 +1,31 @@
+#ifndef SOFORT_DRIVER_IMPL_H
+#define SOFORT_DRIVER_IMPL_H
+
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include <slibtool/slibtool.h>
+#include "argv/argv.h"
+
+extern int slibtool_main(int, char **, char **);
+extern const struct argv_option slbt_default_options[];
+
+enum app_tags {
+	TAG_HELP,
+	TAG_VERSION,
+};
+
+struct slbt_driver_ctx_impl {
+	struct slbt_common_ctx	cctx;
+	struct slbt_driver_ctx	ctx;
+};
+
+struct slbt_unit_ctx_impl {
+	const char *		path;
+	struct slbt_input	map;
+	struct slbt_common_ctx	cctx;
+	struct slbt_unit_ctx	uctx;
+};
+
+#endif