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/******************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/******************************************************/
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#define ARGV_DRIVER
#include <tpax/tpax.h>
#include "tpax_version.h"
#include "tpax_driver_impl.h"
#include "argv/argv.h"
/* package info */
static const struct tpax_source_version tpax_src_version = {
TPAX_TAG_VER_MAJOR,
TPAX_TAG_VER_MINOR,
TPAX_TAG_VER_PATCH,
TPAX_GIT_VERSION
};
/* default fd context */
static const struct tpax_fd_ctx tpax_default_fdctx = {
.fdin = STDIN_FILENO,
.fdout = STDOUT_FILENO,
.fderr = STDERR_FILENO,
.fdcwd = AT_FDCWD,
.fddst = AT_FDCWD,
.fdlog = (-1),
};
struct tpax_driver_ctx_alloc {
struct argv_meta * meta;
struct tpax_driver_ctx_impl ctx;
uint64_t guard;
const char * units[];
};
static uint32_t tpax_argv_flags(uint32_t flags)
{
uint32_t ret = ARGV_CLONE_VECTOR;
if (flags & TPAX_DRIVER_VERBOSITY_NONE)
ret |= ARGV_VERBOSITY_NONE;
if (flags & TPAX_DRIVER_VERBOSITY_ERRORS)
ret |= ARGV_VERBOSITY_ERRORS;
if (flags & TPAX_DRIVER_VERBOSITY_STATUS)
ret |= ARGV_VERBOSITY_STATUS;
return ret;
}
static int tpax_driver_usage(
int fdout,
const char * program,
const char * arg,
const struct argv_option ** optv,
struct argv_meta * meta)
{
char header[512];
snprintf(header,sizeof(header),
"Usage: %s [options] <file>...\n" "Options:\n",
program);
argv_usage(fdout,header,optv,arg);
argv_free(meta);
return TPAX_USAGE;
}
static struct tpax_driver_ctx_impl * tpax_driver_ctx_alloc(
struct argv_meta * meta,
const struct tpax_fd_ctx * fdctx,
const struct tpax_common_ctx * cctx,
size_t nunits)
{
struct tpax_driver_ctx_alloc * ictx;
size_t size;
struct argv_entry * entry;
const char ** units;
int elements;
size = sizeof(struct tpax_driver_ctx_alloc);
size += (nunits+1)*sizeof(const char *);
if (!(ictx = calloc(1,size)))
return 0;
memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx));
memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf);
ictx->ctx.errinfp = &ictx->ctx.erriptr[0];
ictx->ctx.erricap = &ictx->ctx.erriptr[--elements];
ictx->meta = meta;
for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
if (!entry->fopt)
*units++ = entry->arg;
ictx->ctx.ctx.units = ictx->units;
ictx->ctx.ctx.errv = ictx->ctx.errinfp;
return &ictx->ctx;
}
static int tpax_get_driver_ctx_fail(struct argv_meta * meta)
{
argv_free(meta);
return -1;
}
int tpax_get_driver_ctx(
char ** argv,
char ** envp,
uint32_t flags,
const struct tpax_fd_ctx * fdctx,
struct tpax_driver_ctx ** pctx)
{
struct tpax_driver_ctx_impl * ctx;
struct tpax_common_ctx cctx;
const struct argv_option * optv[TPAX_OPTV_ELEMENTS];
struct argv_meta * meta;
struct argv_entry * entry;
size_t nunits;
const char * program;
(void)envp;
if (!fdctx)
fdctx = &tpax_default_fdctx;
argv_optv_init(tpax_default_options,optv);
if (!(meta = argv_get(
argv,optv,
tpax_argv_flags(flags),
fdctx->fderr)))
return -1;
nunits = 0;
program = argv_program_name(argv[0]);
memset(&cctx,0,sizeof(cctx));
cctx.drvflags = flags;
if (!argv[1] && (flags & TPAX_DRIVER_VERBOSITY_USAGE))
return tpax_driver_usage(
fdctx->fderr,
program,
0,optv,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 & TPAX_DRIVER_VERBOSITY_USAGE)
return tpax_driver_usage(
fdctx->fdout,
program,entry->arg,
optv,meta);
break;
case TAG_VERSION:
cctx.drvflags |= TPAX_DRIVER_VERSION;
break;
}
} else
nunits++;
}
if (!(ctx = tpax_driver_ctx_alloc(meta,fdctx,&cctx,nunits)))
return tpax_get_driver_ctx_fail(meta);
ctx->ctx.program = program;
ctx->ctx.cctx = &ctx->cctx;
*pctx = &ctx->ctx;
return TPAX_OK;
}
static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx)
{
argv_free(ictx->meta);
free(ictx);
}
void tpax_free_driver_ctx(struct tpax_driver_ctx * ctx)
{
struct tpax_driver_ctx_alloc * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct tpax_driver_ctx_impl,ctx);
addr = addr - offsetof(struct tpax_driver_ctx_alloc,ctx);
ictx = (struct tpax_driver_ctx_alloc *)addr;
tpax_free_driver_ctx_impl(ictx);
}
}
const struct tpax_source_version * tpax_source_version(void)
{
return &tpax_src_version;
}
int tpax_get_driver_fdctx(
const struct tpax_driver_ctx * dctx,
struct tpax_fd_ctx * fdctx)
{
struct tpax_driver_ctx_impl * ictx;
ictx = tpax_get_driver_ictx(dctx);
fdctx->fdin = ictx->fdctx.fdin;
fdctx->fdout = ictx->fdctx.fdout;
fdctx->fderr = ictx->fdctx.fderr;
fdctx->fdlog = ictx->fdctx.fdlog;
fdctx->fdcwd = ictx->fdctx.fdcwd;
fdctx->fddst = ictx->fdctx.fddst;
return 0;
}
int tpax_set_driver_fdctx(
struct tpax_driver_ctx * dctx,
const struct tpax_fd_ctx * fdctx)
{
struct tpax_driver_ctx_impl * ictx;
ictx = tpax_get_driver_ictx(dctx);
ictx->fdctx.fdin = fdctx->fdin;
ictx->fdctx.fdout = fdctx->fdout;
ictx->fdctx.fderr = fdctx->fderr;
ictx->fdctx.fdlog = fdctx->fdlog;
ictx->fdctx.fdcwd = fdctx->fdcwd;
ictx->fdctx.fddst = fdctx->fddst;
return 0;
}
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