created skeleton.

7 files changed, 1457 insertions, 0 deletions

diff --git a/src/driver/slbt_driver_ctx.c b/src/driver/slbt_driver_ctx.c
new file mode 100644
index 0000000..9888e46
--- /dev/null
+++ b/src/driver/slbt_driver_ctx.c
@@ -0,0 +1,181 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016  Z. Gilboa                                  */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define ARGV_DRIVER
+
+#include <slibtool/slibtool.h>
+#include "slibtool_driver_impl.h"
+#include "argv/argv.h"
+
+struct slbt_driver_ctx_alloc {
+	struct argv_meta *		meta;
+	struct slbt_driver_ctx_impl	ctx;
+	uint64_t			guard;
+	const char *			units[];
+};
+
+static uint32_t slbt_argv_flags(uint32_t flags)
+{
+	uint32_t ret = 0;
+
+	if (flags & SLBT_DRIVER_VERBOSITY_NONE)
+		ret |= ARGV_VERBOSITY_NONE;
+
+	if (flags & SLBT_DRIVER_VERBOSITY_ERRORS)
+		ret |= ARGV_VERBOSITY_ERRORS;
+
+	if (flags & SLBT_DRIVER_VERBOSITY_STATUS)
+		ret |= ARGV_VERBOSITY_STATUS;
+
+	return ret;
+}
+
+static int slbt_driver_usage(
+	const char *			program,
+	const char *			arg,
+	const struct argv_option *	options,
+	struct argv_meta *		meta)
+{
+	char header[512];
+
+	snprintf(header,sizeof(header),
+		"Usage: %s [options] <file>...\n" "Options:\n",
+		program);
+
+	argv_usage(stdout,header,options,arg);
+	argv_free(meta);
+
+	return SLBT_USAGE;
+}
+
+static struct slbt_driver_ctx_impl * slbt_driver_ctx_alloc(
+	struct argv_meta *		meta,
+	const struct slbt_common_ctx *	cctx,
+	size_t				nunits)
+{
+	struct slbt_driver_ctx_alloc *	ictx;
+	size_t				size;
+	struct argv_entry *		entry;
+	const char **			units;
+
+	size =  sizeof(struct slbt_driver_ctx_alloc);
+	size += (nunits+1)*sizeof(const char *);
+
+	if (!(ictx = calloc(1,size)))
+		return 0;
+
+	if (cctx)
+		memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
+
+	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
+		if (!entry->fopt)
+			*units++ = entry->arg;
+
+	ictx->meta = meta;
+	ictx->ctx.ctx.units = ictx->units;
+	return &ictx->ctx;
+}
+
+static int slbt_get_driver_ctx_fail(struct argv_meta * meta)
+{
+	argv_free(meta);
+	return -1;
+}
+
+int slbt_get_driver_ctx(
+	char **				argv,
+	char **				envp,
+	uint32_t			flags,
+	struct slbt_driver_ctx **	pctx)
+{
+	struct slbt_driver_ctx_impl *	ctx;
+	struct slbt_common_ctx		cctx;
+	const struct argv_option *	options;
+	struct argv_meta *		meta;
+	struct argv_entry *		entry;
+	size_t				nunits;
+	const char *			program;
+
+	options = slbt_default_options;
+
+	if (!(meta = argv_get(argv,options,slbt_argv_flags(flags))))
+		return -1;
+
+	nunits	= 0;
+	program = argv_program_name(argv[0]);
+	memset(&cctx,0,sizeof(cctx));
+
+	if (!argv[1] && (flags & SLBT_DRIVER_VERBOSITY_USAGE))
+		return slbt_driver_usage(program,0,options,meta);
+
+	/* get options, count units */
+	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {
+		if (entry->fopt) {
+			switch (entry->tag) {
+				case TAG_HELP:
+					if (flags & SLBT_DRIVER_VERBOSITY_USAGE)
+						return slbt_driver_usage(program,entry->arg,options,meta);
+
+				case TAG_VERSION:
+					cctx.drvflags |= SLBT_DRIVER_VERSION;
+					break;
+			}
+		} else
+			nunits++;
+	}
+
+	if (!(ctx = slbt_driver_ctx_alloc(meta,&cctx,nunits)))
+		return slbt_get_driver_ctx_fail(meta);
+
+	ctx->ctx.program	= program;
+	ctx->ctx.cctx		= &ctx->cctx;
+
+	*pctx = &ctx->ctx;
+	return SLBT_OK;
+}
+
+int slbt_create_driver_ctx(
+	const struct slbt_common_ctx *	cctx,
+	struct slbt_driver_ctx **	pctx)
+{
+	struct argv_meta *		meta;
+	struct slbt_driver_ctx_impl *	ctx;
+	char *				argv[] = {"slibtool_driver",0};
+
+	if (!(meta = argv_get(argv,slbt_default_options,0)))
+		return -1;
+
+	if (!(ctx = slbt_driver_ctx_alloc(meta,cctx,0)))
+		return slbt_get_driver_ctx_fail(0);
+
+	ctx->ctx.cctx = &ctx->cctx;
+	memcpy(&ctx->cctx,cctx,sizeof(*cctx));
+	*pctx = &ctx->ctx;
+	return SLBT_OK;
+}
+
+static void slbt_free_driver_ctx_impl(struct slbt_driver_ctx_alloc * ictx)
+{
+	argv_free(ictx->meta);
+	free(ictx);
+}
+
+void slbt_free_driver_ctx(struct slbt_driver_ctx * ctx)
+{
+	struct slbt_driver_ctx_alloc *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct slbt_driver_ctx_alloc,ctx);
+		addr = addr - offsetof(struct slbt_driver_ctx_impl,ctx);
+		ictx = (struct slbt_driver_ctx_alloc *)addr;
+		slbt_free_driver_ctx_impl(ictx);
+	}
+}
diff --git a/src/driver/slbt_unit_ctx.c b/src/driver/slbt_unit_ctx.c
new file mode 100644
index 0000000..3fab392
--- /dev/null
+++ b/src/driver/slbt_unit_ctx.c
@@ -0,0 +1,62 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016  Z. Gilboa                                  */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include <slibtool/slibtool.h>
+#include "slibtool_driver_impl.h"
+
+static int slbt_free_unit_ctx_impl(struct slbt_unit_ctx_impl * ctx, int status)
+{
+	if (ctx) {
+		slbt_unmap_input(&ctx->map);
+		free(ctx);
+	}
+
+	return status;
+}
+
+int slbt_get_unit_ctx(
+	const struct slbt_driver_ctx *	dctx,
+	const char *			path,
+	struct slbt_unit_ctx **		pctx)
+{
+	struct slbt_unit_ctx_impl *	ctx;
+
+	if (!dctx || !(ctx = calloc(1,sizeof(*ctx))))
+		return -1;
+
+	if (slbt_map_input(-1,path,PROT_READ,&ctx->map))
+		return slbt_free_unit_ctx_impl(ctx,-1);
+
+	memcpy(&ctx->cctx,dctx->cctx,
+		sizeof(ctx->cctx));
+
+	ctx->path	= path;
+
+	ctx->uctx.path	= &ctx->path;
+	ctx->uctx.map	= &ctx->map;
+	ctx->uctx.cctx	= &ctx->cctx;
+
+	*pctx = &ctx->uctx;
+	return 0;
+}
+
+void slbt_free_unit_ctx(struct slbt_unit_ctx * ctx)
+{
+	struct slbt_unit_ctx_impl *	ictx;
+	uintptr_t			addr;
+
+	if (ctx) {
+		addr = (uintptr_t)ctx - offsetof(struct slbt_unit_ctx_impl,uctx);
+		ictx = (struct slbt_unit_ctx_impl *)addr;
+		slbt_free_unit_ctx_impl(ictx,0);
+	}
+}
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
diff --git a/src/logic/slbt_map_input.c b/src/logic/slbt_map_input.c
new file mode 100644
index 0000000..2da2429
--- /dev/null
+++ b/src/logic/slbt_map_input.c
@@ -0,0 +1,51 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016  Z. Gilboa                                  */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <slibtool/slibtool.h>
+
+int slbt_map_input(
+	int			fd,
+	const char *		path,
+	int			prot,
+	struct slbt_input *	map)
+{
+	struct stat	st;
+	bool		fnew;
+	int		ret;
+
+	if ((fnew = (fd < 0)))
+		fd  = open(path,O_RDONLY | O_CLOEXEC);
+
+	if (fd < 0)
+		return -1;
+
+	if ((ret = fstat(fd,&st) < 0) && fnew)
+		close(fd);
+
+	if (ret < 0)
+		return -1;
+
+	map->size = st.st_size;
+	map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);
+
+	if (fnew)
+		close(fd);
+
+	return (map->addr == MAP_FAILED) ? -1 : 0;
+}
+
+int slbt_unmap_input(struct slbt_input * map)
+{
+	return munmap(map->addr,map->size);
+}
diff --git a/src/skin/slbt_skin_default.c b/src/skin/slbt_skin_default.c
new file mode 100644
index 0000000..644b6b9
--- /dev/null
+++ b/src/skin/slbt_skin_default.c
@@ -0,0 +1,12 @@
+#include "slibtool_driver_impl.h"
+#include "argv/argv.h"
+
+const struct argv_option slbt_default_options[] = {
+	{"version",		'v',TAG_VERSION,ARGV_OPTARG_NONE,0,0,0,
+				"show version information"},
+
+	{"help",		'h',TAG_HELP,ARGV_OPTARG_OPTIONAL,0,"short|long",0,
+				"show usage information [listing %s options only]"},
+
+	{0,0,0,0,0,0,0,0}
+};
diff --git a/src/slibtool.c b/src/slibtool.c
new file mode 100644
index 0000000..6fb3422
--- /dev/null
+++ b/src/slibtool.c
@@ -0,0 +1,67 @@
+/*******************************************************************/
+/*  slibtool: a skinny libtool implementation, written in C        */
+/*  Copyright (C) 2016  Z. Gilboa                                  */
+/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
+/*******************************************************************/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <slibtool/slibtool.h>
+#include "slibtool_version.h"
+#include "slibtool_driver_impl.h"
+
+#ifndef SLBT_DRIVER_FLAGS
+#define SLBT_DRIVER_FLAGS	SLBT_DRIVER_VERBOSITY_ERRORS \
+				| SLBT_DRIVER_VERBOSITY_USAGE
+#endif
+
+static const char vermsg[] = "%s (git://midipix.org/slibtool): commit %s.\n";
+
+static ssize_t slibtool_version(struct slbt_driver_ctx * dctx)
+{
+	return fprintf(stdout,vermsg,dctx->program,SLIBTOOL_GIT_VERSION);
+}
+
+static void slibtool_perform_unit_actions(struct slbt_unit_ctx * uctx)
+{
+}
+
+static int slibtool_exit(struct slbt_driver_ctx * dctx, int nerrors)
+{
+	slbt_free_driver_ctx(dctx);
+	return nerrors ? 2 : 0;
+}
+
+int slibtool_main(int argc, char ** argv, char ** envp)
+{
+	int				ret;
+	struct slbt_driver_ctx *	dctx;
+	struct slbt_unit_ctx *		uctx;
+	const char **			unit;
+
+	if ((ret = slbt_get_driver_ctx(argv,envp,SLBT_DRIVER_FLAGS,&dctx)))
+		return (ret == SLBT_USAGE) ? !--argc : 2;
+
+	if (dctx->cctx->drvflags & SLBT_DRIVER_VERSION)
+		if ((slibtool_version(dctx)) < 0)
+			return slibtool_exit(dctx,2);
+
+	for (unit=dctx->units; *unit; unit++) {
+		if (!(slbt_get_unit_ctx(dctx,*unit,&uctx))) {
+			slibtool_perform_unit_actions(uctx);
+			ret += uctx->nerrors;
+			slbt_free_unit_ctx(uctx);
+		}
+	}
+
+	return slibtool_exit(dctx,ret);
+}
+
+#ifndef SLIBTOOL_IN_A_BOX
+
+int main(int argc, char ** argv, char ** envp)
+{
+	return slibtool_main(argc,argv,envp);
+}
+
+#endif