Blame src/driver/pe_driver_ctx.c

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/***************************************************************/
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/*  perk: PE Resource Kit                                      */
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/*  Copyright (C) 2015--2021  Z. Gilboa                        */
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/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */
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/***************************************************************/
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#define ARGV_DRIVER
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#include <perk/perk.h>
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#include <perk/perk_output.h>
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#include "perk_version.h"
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#include "perk_driver_impl.h"
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#include "argv/argv.h"
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/* package info */
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static const struct pe_source_version pe_src_version = {
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	PERK_TAG_VER_MAJOR,
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	PERK_TAG_VER_MINOR,
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	PERK_TAG_VER_PATCH,
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	PERK_GIT_VERSION
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};
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/* default fd context */
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static const struct pe_fd_ctx pe_default_fdctx = {
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	.fdin  = STDIN_FILENO,
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	.fdout = STDOUT_FILENO,
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	.fderr = STDERR_FILENO,
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	.fdcwd = AT_FDCWD,
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	.fddst = AT_FDCWD,
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	.fdlog = (-1),
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};
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struct pe_driver_ctx_alloc {
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	struct argv_meta *		meta;
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	struct pe_driver_ctx_impl	ctx;
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	uint64_t			guard;
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	const char *			units[];
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};
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static uint32_t pe_argv_flags(uint32_t flags)
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{
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	uint32_t ret = ARGV_CLONE_VECTOR;
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	if (flags & PERK_DRIVER_VERBOSITY_NONE)
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		ret |= ARGV_VERBOSITY_NONE;
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	if (flags & PERK_DRIVER_VERBOSITY_ERRORS)
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		ret |= ARGV_VERBOSITY_ERRORS;
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	if (flags & PERK_DRIVER_VERBOSITY_STATUS)
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		ret |= ARGV_VERBOSITY_STATUS;
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	return ret;
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}
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static int pe_driver_usage(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	char header[512];
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	snprintf(header,sizeof(header),
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		"Usage: %s [options] <file>...\n" "Options:\n",
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		program);
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	argv_usage(fdout,header,optv,arg);
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	argv_free(meta);
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	return PERK_USAGE;
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}
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static struct pe_driver_ctx_impl * pe_driver_ctx_alloc(
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	struct argv_meta *		meta,
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	const struct pe_fd_ctx *	fdctx,
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	const struct pe_common_ctx *	cctx,
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	size_t				nunits)
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{
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	struct pe_driver_ctx_alloc *	ictx;
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	size_t				size;
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	struct argv_entry *		entry;
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	const char **			units;
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	int				elements;
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	size =  sizeof(struct pe_driver_ctx_alloc);
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	size += (nunits+1)*sizeof(const char *);
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	if (!(ictx = calloc(1,size)))
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		return 0;
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	memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx));
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	memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
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	elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf);
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	ictx->ctx.errinfp  = &ictx->ctx.erriptr[0];
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	ictx->ctx.erricap  = &ictx->ctx.erriptr[--elements];
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	ictx->meta = meta;
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	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
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		if (!entry->fopt)
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			*units++ = entry->arg;
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	ictx->ctx.ctx.units = ictx->units;
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	ictx->ctx.ctx.errv  = ictx->ctx.errinfp;
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	return &ictx->ctx;
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}
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static int pe_get_driver_ctx_fail(struct argv_meta * meta)
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{
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	argv_free(meta);
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	return -1;
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}
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int pe_get_driver_ctx(
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	char **				argv,
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	char **				envp,
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	uint32_t			flags,
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	const struct pe_fd_ctx *	fdctx,
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	struct pe_driver_ctx ** 	pctx)
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{
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	struct pe_driver_ctx_impl *	ctx;
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	struct pe_common_ctx		cctx;
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	const struct argv_option *	optv[PERK_OPTV_ELEMENTS];
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	struct argv_meta *		meta;
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	struct argv_entry *		entry;
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	size_t				nunits;
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	const char *			program;
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	const char *			pretty;
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	(void)envp;
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	if (!fdctx)
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		fdctx = &pe_default_fdctx;
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	argv_optv_init(pe_default_options,optv);
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	if (!(meta = argv_get(
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			argv,optv,
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			pe_argv_flags(flags),
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			fdctx->fderr)))
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		return -1;
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	pretty	= 0;
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	nunits	= 0;
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	program = argv_program_name(argv[0]);
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	memset(&cctx,0,sizeof(cctx));
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	cctx.drvflags = flags;
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	if (!argv[1] && (flags & PERK_DRIVER_VERBOSITY_USAGE))
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		return pe_driver_usage(
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			fdctx->fderr,
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			program,
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			0,optv,meta);
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	/* get options, count units */
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	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {
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		if (entry->fopt) {
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			switch (entry->tag) {
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				case TAG_HELP:
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					if (flags & PERK_DRIVER_VERBOSITY_USAGE)
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						return pe_driver_usage(
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							fdctx->fdout,
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							program,entry->arg,
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							optv,meta);
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					break;
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				case TAG_VERSION:
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					cctx.drvflags |= PERK_DRIVER_VERSION;
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					break;
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				case TAG_PRETTY:
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					pretty = entry->arg;
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					break;
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				case TAG_CATEGORY:
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					cctx.fmtflags |= PERK_OUTPUT_IMAGE_CATEGORY;
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					break;
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				case TAG_SECTIONS:
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					cctx.fmtflags |= PERK_OUTPUT_IMAGE_SECTIONS;
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					break;
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				case TAG_SYMBOLS:
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					cctx.fmtflags |= PERK_OUTPUT_IMAGE_SYMBOLS;
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					break;
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				case TAG_STRINGS:
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					cctx.fmtflags |= PERK_OUTPUT_IMAGE_STRINGS;
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					break;
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				case TAG_EXPSYMS:
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					cctx.fmtflags |= PERK_OUTPUT_EXPORT_SYMS;
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					break;
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				case TAG_IMPLIBS:
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					cctx.fmtflags |= PERK_OUTPUT_IMPORT_LIBS;
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					break;
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				case TAG_IMPSYMS:
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					cctx.fmtflags |= PERK_OUTPUT_IMPORT_SYMS;
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					break;
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				case TAG_DSOLIBS:
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					cctx.fmtflags |= PERK_OUTPUT_MDSO_LIBS;
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					break;
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				case TAG_DSOSYMS:
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					cctx.fmtflags |= PERK_OUTPUT_MDSO_SYMS;
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					break;
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				case TAG_HDRDUMP:
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					if (!entry->arg) {
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						cctx.hdrdump = 0;
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						cctx.hdrdump = ~cctx.hdrdump;
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					} else if (!strcmp(entry->arg,"dos")) {
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						cctx.hdrdump  = PERK_HDRDUMP_IMAGE_DOS_HEADER;
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					} else if (!strcmp(entry->arg,"image.dos")) {
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						cctx.hdrdump  = PERK_HDRDUMP_IMAGE_DOS_HEADER;
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					} else if (!strcmp(entry->arg,"coff")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_IMAGE_HEADER;
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						cctx.hdrdump |= PERK_HDRDUMP_COFF_OBJECT_HEADER;
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						cctx.hdrdump |= PERK_HDRDUMP_COFF_OPT_HEADER;
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					} else if (!strcmp(entry->arg,"coff.image")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_IMAGE_HEADER;
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					} else if (!strcmp(entry->arg,"coff.obj")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_OBJECT_HEADER;
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					} else if (!strcmp(entry->arg,"coff.object")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_OBJECT_HEADER;
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					} else if (!strcmp(entry->arg,"coff.opt")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_OPT_HEADER;
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					} else if (!strcmp(entry->arg,"coff.optional")) {
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						cctx.hdrdump  = PERK_HDRDUMP_COFF_OPT_HEADER;
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					} else if (!strcmp(entry->arg,"sectbl")) {
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						cctx.hdrdump  = PERK_HDRDUMP_SECTION_TABLE;
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					} else if (!strcmp(entry->arg,"section.table")) {
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						cctx.hdrdump  = PERK_HDRDUMP_SECTION_TABLE;
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					} else if (!strcmp(entry->arg,"exphdr")) {
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						cctx.hdrdump  = PERK_HDRDUMP_EXPORT_HEADER;
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					} else if (!strcmp(entry->arg,"export.header")) {
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						cctx.hdrdump  = PERK_HDRDUMP_EXPORT_HEADER;
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					} else if (!strcmp(entry->arg,"imptbl")) {
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						cctx.hdrdump  = PERK_HDRDUMP_IMPORT_TABLE;
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					} else if (!strcmp(entry->arg,"import.table")) {
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						cctx.hdrdump  = PERK_HDRDUMP_IMPORT_TABLE;
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					}
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					break;
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			}
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		} else
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			nunits++;
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	}
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	if (pretty && !strcmp(pretty,"yaml"))
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		cctx.fmtflags |= PERK_PRETTY_YAML;
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	else if (pretty && !strcmp(pretty,"dlltool"))
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		cctx.fmtflags |= PERK_PRETTY_DLLTOOL;
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	if (!(ctx = pe_driver_ctx_alloc(meta,fdctx,&cctx,nunits)))
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		return pe_get_driver_ctx_fail(meta);
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	ctx->ctx.program	= program;
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	ctx->ctx.cctx		= &ctx->cctx;
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	*pctx = &ctx->ctx;
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	return PERK_OK;
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}
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static void pe_free_driver_ctx_impl(struct pe_driver_ctx_alloc * ictx)
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{
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	argv_free(ictx->meta);
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	free(ictx);
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}
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void pe_free_driver_ctx(struct pe_driver_ctx * ctx)
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{
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	struct pe_driver_ctx_alloc *	ictx;
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	uintptr_t			addr;
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	if (ctx) {
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		addr = (uintptr_t)ctx - offsetof(struct pe_driver_ctx_impl,ctx);
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		addr = addr - offsetof(struct pe_driver_ctx_alloc,ctx);
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		ictx = (struct pe_driver_ctx_alloc *)addr;
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		pe_free_driver_ctx_impl(ictx);
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	}
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}
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const struct pe_source_version * pe_source_version(void)
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{
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	return &pe_src_version;
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}
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int pe_get_driver_fdctx(
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	const struct pe_driver_ctx *	dctx,
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	struct pe_fd_ctx *		fdctx)
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{
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	struct pe_driver_ctx_impl *	ictx;
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	ictx = pe_get_driver_ictx(dctx);
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	fdctx->fdin  = ictx->fdctx.fdin;
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	fdctx->fdout = ictx->fdctx.fdout;
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	fdctx->fderr = ictx->fdctx.fderr;
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	fdctx->fdlog = ictx->fdctx.fdlog;
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	fdctx->fdcwd = ictx->fdctx.fdcwd;
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	fdctx->fddst = ictx->fdctx.fddst;
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	return 0;
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}
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int pe_set_driver_fdctx(
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	struct pe_driver_ctx *	dctx,
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	const struct pe_fd_ctx *	fdctx)
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{
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	struct pe_driver_ctx_impl *	ictx;
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	ictx = pe_get_driver_ictx(dctx);
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	ictx->fdctx.fdin  = fdctx->fdin;
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	ictx->fdctx.fdout = fdctx->fdout;
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	ictx->fdctx.fderr = fdctx->fderr;
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	ictx->fdctx.fdlog = fdctx->fdlog;
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	ictx->fdctx.fdcwd = fdctx->fdcwd;
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	ictx->fdctx.fddst = fdctx->fddst;
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	return 0;
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}