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/**
* @file common.c
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief common internal definitions for libyang
*
* Copyright (c) 2018 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#define _XOPEN_SOURCE
#define _DEFAULT_SOURCE
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
#include "tree_schema.h"
const char *const ly_stmt_list[] = {
[YANG_ACTION] = "action",
[YANG_ANYDATA] = "anydata",
[YANG_ANYXML] = "anyxml",
[YANG_ARGUMENT] = "argument",
[YANG_AUGMENT] = "augment",
[YANG_BASE] = "base",
[YANG_BELONGS_TO] = "belongs-to",
[YANG_BIT] = "bit",
[YANG_CASE] = "case",
[YANG_CHOICE] = "choice",
[YANG_CONFIG] = "config",
[YANG_CONTACT] = "contact",
[YANG_CONTAINER] = "container",
[YANG_CUSTOM] = "<extension-instance>",
[YANG_DEFAULT] = "default",
[YANG_DESCRIPTION] = "description",
[YANG_DEVIATE] = "deviate",
[YANG_DEVIATION] = "deviation",
[YANG_ENUM] = "enum",
[YANG_ERROR_APP_TAG] = "error-app-tag",
[YANG_ERROR_MESSAGE] = "error-message",
[YANG_EXTENSION] = "extension",
[YANG_FEATURE] = "feature",
[YANG_FRACTION_DIGITS] = "fraction-digits",
[YANG_GROUPING] = "grouping",
[YANG_IDENTITY] = "identitiy",
[YANG_IF_FEATURE] = "if-feature",
[YANG_IMPORT] = "import",
[YANG_INCLUDE] = "include",
[YANG_INPUT] = "input",
[YANG_KEY] = "key",
[YANG_LEAF] = "leaf",
[YANG_LEAF_LIST] = "leaf-list",
[YANG_LENGTH] = "length",
[YANG_LIST] = "list",
[YANG_MANDATORY] = "mandatory",
[YANG_MAX_ELEMENTS] = "max-elements",
[YANG_MIN_ELEMENTS] = "min-elements",
[YANG_MODIFIER] = "modifier",
[YANG_MODULE] = "module",
[YANG_MUST] = "must",
[YANG_NAMESPACE] = "namespace",
[YANG_NOTIFICATION] = "notification",
[YANG_ORDERED_BY] = "ordered-by",
[YANG_ORGANIZATION] = "organization",
[YANG_OUTPUT] = "output",
[YANG_PATH] = "path",
[YANG_PATTERN] = "pattern",
[YANG_POSITION] = "position",
[YANG_PREFIX] = "prefix",
[YANG_PRESENCE] = "presence",
[YANG_RANGE] = "range",
[YANG_REFERENCE] = "reference",
[YANG_REFINE] = "refine",
[YANG_REQUIRE_INSTANCE] = "require-instance",
[YANG_REVISION] = "revision",
[YANG_REVISION_DATE] = "revision-date",
[YANG_RPC] = "rpc",
[YANG_STATUS] = "status",
[YANG_SUBMODULE] = "submodule",
[YANG_TYPE] = "type",
[YANG_TYPEDEF] = "typedef",
[YANG_UNIQUE] = "unique",
[YANG_UNITS] = "units",
[YANG_USES] = "uses",
[YANG_VALUE] = "value",
[YANG_WHEN] = "when",
[YANG_YANG_VERSION] = "yang-version",
[YANG_YIN_ELEMENT] = "yin-element",
[YANG_SEMICOLON] = ";",
[YANG_LEFT_BRACE] = "{",
[YANG_RIGHT_BRACE] = "}",
};
const char *const lyext_substmt_list[] = {
[LYEXT_SUBSTMT_ARGUMENT] = "argument",
[LYEXT_SUBSTMT_BASE] = "base",
[LYEXT_SUBSTMT_BELONGSTO] = "belongs-to",
[LYEXT_SUBSTMT_CONTACT] = "contact",
[LYEXT_SUBSTMT_DEFAULT] = "default",
[LYEXT_SUBSTMT_DESCRIPTION] = "description",
[LYEXT_SUBSTMT_ERRTAG] = "error-app-tag",
[LYEXT_SUBSTMT_ERRMSG] = "error-message",
[LYEXT_SUBSTMT_KEY] = "key",
[LYEXT_SUBSTMT_NAMESPACE] = "namespace",
[LYEXT_SUBSTMT_ORGANIZATION] = "organization",
[LYEXT_SUBSTMT_PATH] = "path",
[LYEXT_SUBSTMT_PREFIX] = "prefix",
[LYEXT_SUBSTMT_PRESENCE] = "presence",
[LYEXT_SUBSTMT_REFERENCE] = "reference",
[LYEXT_SUBSTMT_REVISIONDATE] = "revision-date",
[LYEXT_SUBSTMT_UNITS] = "units",
[LYEXT_SUBSTMT_VALUE] = "value",
[LYEXT_SUBSTMT_VERSION] = "yang-version",
[LYEXT_SUBSTMT_MODIFIER] = "modifier",
[LYEXT_SUBSTMT_REQINSTANCE] = "require-instance",
[LYEXT_SUBSTMT_YINELEM] = "yin-element",
[LYEXT_SUBSTMT_CONFIG] = "config",
[LYEXT_SUBSTMT_MANDATORY] = "mandatory",
[LYEXT_SUBSTMT_ORDEREDBY] = "ordered-by",
[LYEXT_SUBSTMT_STATUS] = "status",
[LYEXT_SUBSTMT_FRACDIGITS] = "fraction-digits",
[LYEXT_SUBSTMT_MAX] = "max-elements",
[LYEXT_SUBSTMT_MIN] = "min-elements",
[LYEXT_SUBSTMT_POSITION] = "position",
[LYEXT_SUBSTMT_UNIQUE] = "unique",
[LYEXT_SUBSTMT_IFFEATURE] = "if-feature",
};
const char *const ly_devmod_list[] = {
[LYS_DEV_NOT_SUPPORTED] = "not-supported",
[LYS_DEV_ADD] = "add",
[LYS_DEV_DELETE] = "delete",
[LYS_DEV_REPLACE] = "replace",
};
void *
ly_realloc(void *ptr, size_t size)
{
void *new_mem;
new_mem = realloc(ptr, size);
if (!new_mem) {
free(ptr);
}
return new_mem;
}
LY_ERR
ly_getutf8(const char **input, unsigned int *utf8_char, size_t *bytes_read)
{
unsigned int c, len;
int aux;
int i;
c = (*input)[0];
LY_CHECK_RET(!c, LY_EINVAL);
if (!(c & 0x80)) {
/* one byte character */
len = 1;
if (c < 0x20 && c != 0x9 && c != 0xa && c != 0xd) {
return LY_EINVAL;
}
} else if ((c & 0xe0) == 0xc0) {
/* two bytes character */
len = 2;
aux = (*input)[1];
if ((aux & 0xc0) != 0x80) {
return LY_EINVAL;
}
c = ((c & 0x1f) << 6) | (aux & 0x3f);
if (c < 0x80) {
return LY_EINVAL;
}
} else if ((c & 0xf0) == 0xe0) {
/* three bytes character */
len = 3;
c &= 0x0f;
for (i = 1; i <= 2; i++) {
aux = (*input)[i];
if ((aux & 0xc0) != 0x80) {
return LY_EINVAL;
}
c = (c << 6) | (aux & 0x3f);
}
if (c < 0x800 || (c > 0xd7ff && c < 0xe000) || c > 0xfffd) {
return LY_EINVAL;
}
} else if ((c & 0xf8) == 0xf0) {
/* four bytes character */
len = 4;
c &= 0x07;
for (i = 1; i <= 3; i++) {
aux = (*input)[i];
if ((aux & 0xc0) != 0x80) {
return LY_EINVAL;
}
c = (c << 6) | (aux & 0x3f);
}
if (c < 0x1000 || c > 0x10ffff) {
return LY_EINVAL;
}
} else {
return LY_EINVAL;
}
(*utf8_char) = c;
(*input) += len;
if (bytes_read) {
(*bytes_read) = len;
}
return LY_SUCCESS;
}
size_t
LY_VCODE_INSTREXP_len(const char *str)
{
size_t len = 0;
if (!str) {
return len;
} else if (!str[0]) {
return 1;
}
for (len = 1; len < LY_VCODE_INSTREXP_MAXLEN && str[len]; ++len);
return len;
}
LY_ERR
ly_mmap(struct ly_ctx *ctx, int fd, size_t *length, void **addr)
{
struct stat sb;
long pagesize;
size_t m;
assert(length);
assert(addr);
assert(fd >= 0);
if (fstat(fd, &sb) == -1) {
LOGERR(ctx, LY_ESYS, "Failed to stat the file descriptor (%s) for the mmap().", strerror(errno));
return LY_ESYS;
}
if (!S_ISREG(sb.st_mode)) {
LOGERR(ctx, LY_EINVAL, "File to mmap() is not a regular file.");
return LY_ESYS;
}
if (!sb.st_size) {
*addr = NULL;
return LY_SUCCESS;
}
pagesize = sysconf(_SC_PAGESIZE);
m = sb.st_size % pagesize;
if (m && pagesize - m >= 1) {
/* there will be enough space (at least 1 byte) after the file content mapping to provide zeroed NULL-termination byte */
*length = sb.st_size + 1;
*addr = mmap(NULL, *length, PROT_READ, MAP_PRIVATE, fd, 0);
} else {
/* there will not be enough bytes after the file content mapping for the additional bytes and some of them
* would overflow into another page that would not be zerroed and any access into it would generate SIGBUS.
* Therefore we have to do the following hack with double mapping. First, the required number of bytes
* (including the additinal bytes) is required as anonymous and thus they will be really provided (actually more
* because of using whole pages) and also initialized by zeros. Then, the file is mapped to the same address
* where the anonymous mapping starts. */
*length = sb.st_size + pagesize;
*addr = mmap(NULL, *length, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
*addr = mmap(*addr, sb.st_size, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, 0);
}
if (*addr == MAP_FAILED) {
LOGERR(ctx, LY_ESYS, "mmap() failed (%s).", strerror(errno));
return LY_ESYS;
}
return LY_SUCCESS;
}
LY_ERR
ly_munmap(void *addr, size_t length)
{
if (munmap(addr, length)) {
return LY_ESYS;
}
return LY_SUCCESS;
}