Blame src/driver/pe_driver_ctx.c

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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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#include <perk/perk.h>
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#include <perk/perk_output.h>
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#include "argv/argv.h"
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enum app_tags {
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	TAG_HELP,
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	TAG_VERSION,
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	TAG_OUTPUT,
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	TAG_PRETTY,
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	TAG_EXPSYMS,
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	TAG_IMPLIBS,
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	TAG_IMPSYMS,
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};
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static const struct argv_option options[] = {
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	{"version",	'v',TAG_VERSION,ARGV_OPTARG_NONE,	0,0,
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								"show version information"},
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	{"help",	'h',TAG_HELP,	ARGV_OPTARG_OPTIONAL,	"short|long",0,
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								"show usage information "
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								"[listing %s options only]"},
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	{"output",	'o',TAG_OUTPUT,	ARGV_OPTARG_REQUIRED,	0,"<file>",
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								"write output to %s"},
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	{"pretty",	'p',TAG_PRETTY,	ARGV_OPTARG_REQUIRED,	"yaml",0,
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								"format output for parsing by %s"},
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	{"expsyms",	'e',TAG_EXPSYMS,ARGV_OPTARG_NONE,	0,0,
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								"print exported symbols" },
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	{"implibs",	'i',TAG_IMPLIBS,ARGV_OPTARG_NONE,	0,0,
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								"list direct dependency libraries"},
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	{"impsyms",	'I',TAG_IMPSYMS,ARGV_OPTARG_NONE,	0,0,
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								"list direct dependency libraries "
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								"along with required symbols"},
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	{0}
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};
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struct pe_driver_ctx_impl {
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	struct argv_meta *	meta;
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	struct pe_symbol_ctx	symctx;
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	struct pe_output_ctx	outctx;
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	struct pe_linker_ctx	lnkctx;
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	struct pe_server_ctx	srvctx;
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	struct pe_driver_ctx	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 = 0;
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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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	const char *		program,
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	const char *		arg,
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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(stdout,header,options,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 * pe_driver_ctx_alloc(struct argv_meta * meta, size_t nunits)
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{
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	struct pe_driver_ctx_impl *	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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	size =  sizeof(struct pe_driver_ctx_impl);
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	size += (nunits+1)*sizeof(const char *);
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	if (!(ictx = calloc(size,1)))
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		return 0;
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	ictx->meta		= meta;
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	ictx->ctx.cctx.symctx	= &ictx->symctx;
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	ictx->ctx.cctx.outctx	= &ictx->outctx;
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	ictx->ctx.cctx.lnkctx	= &ictx->lnkctx;
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	ictx->ctx.cctx.srvctx	= &ictx->srvctx;
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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.units = ictx->units;
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	return &ictx->ctx;
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}
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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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	const char **		argv,
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	const char **		envp,
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	uint32_t		flags,
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	struct pe_driver_ctx ** pctx)
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{
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	struct pe_driver_ctx *	ctx;
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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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	uint64_t		dflags;
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	uint64_t		fflags;
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	const char *		program;
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	const char *		output;
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	const char *		pretty;
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	int			fdout;
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	if (!(meta = argv_get(argv,options,pe_argv_flags(flags))))
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		return -1;
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	dflags	= 0;
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	fflags	= 0;
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	output	= 0;
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	pretty	= 0;
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	nunits	= 0;
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	fdout	= 0;
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	program = argv_program_name(argv[0]);
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	if (!argv[1] && (flags & PERK_DRIVER_VERBOSITY_USAGE))
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		return pe_driver_usage(program,0,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(program,entry->arg,meta);
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				case TAG_VERSION:
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					dflags |= PERK_DRIVER_VERSION;
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					break;
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				case TAG_OUTPUT:
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					output = entry->arg;
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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_EXPSYMS:
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					fflags |= PERK_OUTPUT_EXPORT_SYMS;
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					break;
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				case TAG_IMPLIBS:
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					fflags |= PERK_OUTPUT_IMPORT_LIBS;
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					break;
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				case TAG_IMPSYMS:
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					fflags |= PERK_OUTPUT_IMPORT_SYMS;
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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 (output && ((fdout = open(output,
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			O_CREAT|O_TRUNC|O_WRONLY|O_NOCTTY|O_NOFOLLOW,
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			S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0))
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		return pe_get_driver_ctx_fail(meta);
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	if (!(ctx = pe_driver_ctx_alloc(meta,nunits)) && output)
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		close(fdout);
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	if (!ctx)
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		return pe_get_driver_ctx_fail(meta);
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	if (pretty && !strcmp(pretty,"yaml"))
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		fflags |= PERK_PRETTY_YAML;
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	ctx->program		= program;
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	ctx->cctx.drvflags	= dflags;
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	ctx->cctx.fmtflags	= fflags;
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	ctx->cctx.output	= output;
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	ctx->cctx.fdout		= output ? fdout : -1;
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	ctx->cctx.fdin		= -1;
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	ctx->cctx.fderr		= -1;
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	ctx->cctx.fdlog		= -1;
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	ctx->cctx.fdsrc		= AT_FDCWD;
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	ctx->cctx.fddst		= AT_FDCWD;
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	ctx->cctx.fdtmp		= AT_FDCWD;
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	*pctx = ctx;
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	return PERK_OK;
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}
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static void pe_driver_close_fds(struct pe_common_ctx * cctx)
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{
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	if (cctx->status && cctx->output)
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		unlinkat(cctx->fddst,cctx->output,0);
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	if (cctx->fdout >= 0)
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		close(cctx->fdout);
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}
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static void pe_free_driver_ctx_impl(struct pe_driver_ctx_impl * ictx)
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{
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	if (ictx->symctx.append)
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		free(ictx->symctx.append);
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	if (ictx->symctx.exclude)
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		free(ictx->symctx.exclude);
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	pe_driver_close_fds(&ictx->ctx.cctx);
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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_impl *	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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		ictx = (struct pe_driver_ctx_impl *)addr;
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		pe_free_driver_ctx_impl(ictx);
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	}
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}