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/**************************************************************/
/* treebnf: a tree oriented bnf library */
/* Copyright (C) 2024 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.TREEBNF. */
/**************************************************************/
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <treebnf/treebnf.h>
#include "treebnf_driver_impl.h"
#include "treebnf_errinfo_impl.h"
#include "treebnf_tmpfile_impl.h"
static int tbnf_free_unit_ctx_impl(struct tbnf_unit_ctx_impl * ctx, int ret)
{
if (ctx) {
tbnf_lib_unmap_raw_input(&ctx->map);
free(ctx);
}
return ret;
}
static int tbnf_stdin_to_tmp(const struct tbnf_driver_ctx * dctx)
{
struct tbnf_driver_ctx_impl * ictx;
int fdtmp;
ssize_t ret;
ssize_t cnt;
char * ch;
char buf[4096];
ictx = tbnf_get_driver_ictx(dctx);
if (ictx->fdtmpin >= 0)
return dup(ictx->fdtmpin);
if ((fdtmp = tbnf_tmpfile()) < 0)
return -1;
if ((ictx->fdtmpin = dup(fdtmp)) < 0) {
close(fdtmp);
return -1;
}
for (;;) {
ret = read(0,buf,sizeof(buf)-1);
while ((ret < 0) && (errno == EINTR))
ret = read(0,buf,sizeof(buf)-1);
if (ret < 0) {
close(fdtmp);
return -1;
} else if (ret == 0) {
return fdtmp;
} else {
ch = buf;
cnt = ret;
for (; cnt; ) {
ret = write(fdtmp,ch,cnt);
while ((ret < 0) && (errno == EINTR))
ret = write(fdtmp,ch,cnt);
if (ret < 0) {
close(fdtmp);
return -1;
}
ch += ret;
cnt -= ret;
}
}
}
}
int tbnf_lib_get_unit_ctx(
const struct tbnf_driver_ctx * dctx,
const char * path,
struct tbnf_unit_ctx ** pctx)
{
struct tbnf_unit_ctx_impl * ctx;
int prot;
int fd;
if (!dctx)
return TBNF_CUSTOM_ERROR(
dctx,TBNF_ERR_NULL_CONTEXT);
else if (!(ctx = calloc(1,sizeof(*ctx))))
return TBNF_BUFFER_ERROR(dctx);
tbnf_driver_set_ectx(
dctx,0,path);
prot = PROT_READ;
if (strcmp(path,"-"))
fd = -1;
else if ((fd = tbnf_stdin_to_tmp(dctx)) < 0)
return tbnf_free_unit_ctx_impl(
ctx,TBNF_FILE_ERROR(dctx));
if (tbnf_lib_map_raw_input(dctx,fd,path,prot,&ctx->map))
return tbnf_free_unit_ctx_impl(
ctx,TBNF_NESTED_ERROR(dctx));
if (fd >= 0)
close(fd);
ctx->path = path;
ctx->uctx.path = &ctx->path;
ctx->uctx.map = &ctx->map;
*pctx = &ctx->uctx;
return 0;
}
void tbnf_lib_free_unit_ctx(struct tbnf_unit_ctx * ctx)
{
struct tbnf_unit_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct tbnf_unit_ctx_impl,uctx);
ictx = (struct tbnf_unit_ctx_impl *)addr;
tbnf_free_unit_ctx_impl(ictx,0);
}
}
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