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netcdf-c/libdispatch/ncs3sdk.cpp
Dennis Heimbigner 9b7202bf06 Explicitly disallow variable length type compression 
re: https://github.com/Unidata/netcdf-c/issues/2189

Compression of a variable whose type is variable length
fails for all current filters. This is because at some point,
the compression buffer will contain pointers to data instead
of the actual data. Compression of pointers of course is meaningless.

The PR changes the behavior of nc_def_var_filter so that it will
fail with error NC_EFILTER if an attempt is made to add a filter
to a variable whose type is variable-length.

A variable is variable-length if it is of type string or VLEN
or transitively (via a compound type) contains a string or VLEN.

Also added a test case for this.

## Misc Changes
1. Turn off a number of debugging statements
2022-02-19 16:47:31 -07:00

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/*
* Copyright 2018, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
/* WARNING: changes to this file may need to be propagated to libsrc/s3sdk.cpp */
#define NOOP
#define DEBUG
#include "awsincludes.h"
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <streambuf>
#include "netcdf.h"
#include "ncrc.h"
#include "ncs3sdk.h"
#undef NCTRACING
#ifdef NCTRACING
#define NCTRACE(level,fmt,...) nctrace((level),__func__,fmt,##__VA_ARGS__)
#define NCTRACEMORE(level,fmt,...) nctracemore((level),fmt,##__VA_ARGS__)
#define NCUNTRACE(e) ncuntrace(__func__,THROW(e),NULL)
#define NCUNTRACEX(e,fmt,...) ncuntrace(__func__,THROW(e),fmt,##__VA_ARGS__)
#else
#define NCTRACE(level,fmt,...)
#define NCTRACEMORE(level,fmt,...)
#define NCUNTRACE(e) (e)
#define NCUNTRACEX(e,fmt,...) (e)
#endif
#ifdef __CYGWIN__
extern char* strdup(const char*);
#endif
#define size64_t unsigned long long
static int ncs3_initialized = 0;
static int ncs3_finalized = 0;
static Aws::SDKOptions ncs3options;
/* Forward */
static Aws::S3::Model::BucketLocationConstraint s3findregion(const char* name);
static int s3objectinfo1(const Aws::S3::Model::Object& s3_object, char** fullkeyp, size64_t* lenp);
static int s3objectsinfo(Aws::Vector<Aws::S3::Model::Object> list, size_t*, char*** keysp, size64_t** lenp);
static int s3commonprefixes(Aws::Vector<Aws::S3::Model::CommonPrefix> list, char*** keysp);
static void freestringenvv(char** ss);
static int makes3key(const char* pathkey, const char** keyp);
static int makes3keydir(const char* prefix, char** prefixdirp);
static char** mergekeysets(size_t nkeys1, char** keys1, size_t nkeys2, char** keys2);
static const char*
dumps3info(NCS3INFO* info)
{
static char text[8192];
snprintf(text,sizeof(text),"host=%s region=%s bucket=%s rootkey=%s profile=%s",
(info->host?info->host:"null"),
(info->region?info->region:"null"),
(info->bucket?info->bucket:"null"),
(info->rootkey?info->rootkey:"null"),
(info->profile?info->profile:"null"));
return text;
}
EXTERNL int
NC_s3sdkinitialize(void)
{
if(!ncs3_initialized) {
ncs3_initialized = 1;
ncs3_finalized = 0;
NCTRACE(11,NULL);
Aws::InitAPI(ncs3options);
}
return NCUNTRACE(NC_NOERR);
}
EXTERNL int
NC_s3sdkfinalize(void)
{
if(!ncs3_finalized) {
ncs3_initialized = 0;
ncs3_finalized = 1;
NCTRACE(11,NULL);
Aws::ShutdownAPI(ncs3options);
}
return NCUNTRACE(NC_NOERR);
}
static char*
makeerrmsg(const Aws::Client::AWSError<Aws::S3::S3Errors> err, const char* key="")
{
char* errmsg;
size_t len;
len = strlen(err.GetExceptionName().c_str()) + strlen(err.GetMessage().c_str()) + strlen(key) + 10;
if((errmsg = (char*)malloc(len+1))==NULL)
return NULL;
snprintf(errmsg,len,"%s %s key=%s",
err.GetExceptionName().c_str(),
err.GetMessage().c_str(),
key);
return errmsg;
}
static Aws::Client::ClientConfiguration
s3sdkcreateconfig(NCS3INFO* info)
{
int stat = NC_NOERR;
NCTRACE(11,"info=%s", dumps3info(info));
Aws::Client::ClientConfiguration config;
if(info->profile)
#if 0
config = new Aws::Client::ClientConfiguration(info->profile);
else
config = new Aws::Client::ClientConfiguration();
#else
config.profileName = info->profile;
#endif
config.scheme = Aws::Http::Scheme::HTTPS;
config.connectTimeoutMs = 300000;
config.requestTimeoutMs = 600000;
if(info->region) config.region = info->region;
if(info->host) config.endpointOverride = info->host;
config.enableEndpointDiscovery = true;
config.followRedirects = Aws::Client::FollowRedirectsPolicy::ALWAYS;
NCUNTRACE(NC_NOERR);
return config;
}
EXTERNL void*
NC_s3sdkcreateclient(NCS3INFO* info)
{
NCTRACE(11,NULL);
Aws::Client::ClientConfiguration config = s3sdkcreateconfig(info);
Aws::S3::S3Client *s3client;
if(info->profile == NULL || strcmp(info->profile,"none")==0) {
Aws::Auth::AWSCredentials creds;
creds.SetAWSAccessKeyId(Aws::String(""));
creds.SetAWSSecretKey(Aws::String(""));
s3client = new Aws::S3::S3Client(creds,config,
Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::RequestDependent,
false);
} else {
s3client = new Aws::S3::S3Client(config,
Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::RequestDependent,
false);
}
// delete config;
NCUNTRACE(NC_NOERR);
return (void*)s3client;
}
EXTERNL int
NC_s3sdkbucketexists(void* s3client0, const char* bucket, int* existsp, char** errmsgp)
{
int stat = NC_NOERR;
int exists = 0;
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
NCTRACE(11,"bucket=%s",bucket);
if(errmsgp) *errmsgp = NULL;
auto result = s3client->ListBuckets();
if(!result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(result.GetError());
stat = NC_ES3;
} else {
Aws::Vector<Aws::S3::Model::Bucket> bucket_list = result.GetResult().GetBuckets();
for(auto const &awsbucket : bucket_list) {
auto name = awsbucket.GetName();
if(name == bucket) {exists = 1; break;}
}
}
if(existsp) *existsp = exists;
return NCUNTRACEX(stat,"exists=%d",*existsp);
}
EXTERNL int
NC_s3sdkbucketcreate(void* s3client0, const char* region, const char* bucket, char** errmsgp)
{
int stat = NC_NOERR;
NCTRACE(11,"region=%s bucket=%s",region,bucket);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
if(errmsgp) *errmsgp = NULL;
const Aws::S3::Model::BucketLocationConstraint &awsregion = s3findregion(region);
if(awsregion == Aws::S3::Model::BucketLocationConstraint::NOT_SET)
return NC_EURL;
/* Set up the request */
Aws::S3::Model::CreateBucketRequest create_request;
create_request.SetBucket(bucket);
if(region) {
/* Specify the region as a location constraint */
Aws::S3::Model::CreateBucketConfiguration bucket_config;
bucket_config.SetLocationConstraint(awsregion);
create_request.SetCreateBucketConfiguration(bucket_config);
}
#ifdef NOOP
/* Create the bucket */
auto create_result = s3client->CreateBucket(create_request);
if(!create_result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(create_result.GetError());
stat = NC_ES3;;
}
#else
fprintf(stderr,"create bucket: %s\n",bucket); fflush(stderr);
#endif
return NCUNTRACE(stat);
}
EXTERNL int
NC_s3sdkbucketdelete(void* s3client0, NCS3INFO* info, char** errmsgp)
{
int stat = NC_NOERR;
NCTRACE(11,"info=%s%s",dumps3info(info));
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
if(errmsgp) *errmsgp = NULL;
const Aws::S3::Model::BucketLocationConstraint &awsregion = s3findregion(info->region);
if(awsregion == Aws::S3::Model::BucketLocationConstraint::NOT_SET)
return NC_EURL;
/* Set up the request */
Aws::S3::Model::DeleteBucketRequest request;
request.SetBucket(info->bucket);
#ifdef NOOP
/* Delete the bucket */
auto result = s3client->DeleteBucket(request);
if(!result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(result.GetError());
stat = NC_ES3;;
}
#else
fprintf(stderr,"delete bucket: %s\n",bucket); fflush(stderr);
#endif
return NCUNTRACE(stat);
}
/**************************************************/
/* Object API */
/*
@return NC_NOERR if key points to a content-bearing object.
@return NC_EEMPTY if object at key has no content.
@return NC_EXXX return true error
*/
EXTERNL int
NC_s3sdkinfo(void* s3client0, const char* bucket, const char* pathkey, size64_t* lenp, char** errmsgp)
{
int stat = NC_NOERR;
const char* key = NULL;
NCTRACE(11,"bucket=%s pathkey=%s",bucket,pathkey);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::HeadObjectRequest head_request;
if(*pathkey != '/') return NC_EINTERNAL;
/* extract the true s3 key*/
if((stat = makes3key(pathkey,&key))) return NCUNTRACE(stat);
if(errmsgp) *errmsgp = NULL;
head_request.SetBucket(bucket);
head_request.SetKey(key);
auto head_outcome = s3client->HeadObject(head_request);
if(head_outcome.IsSuccess()) {
long long l = head_outcome.GetResult().GetContentLength();
if(lenp) *lenp = (size64_t)l;
} else {
if(lenp) *lenp = 0;
/* Distinquish not-found from other errors */
switch (head_outcome.GetError().GetErrorType()) {
case Aws::S3::S3Errors::RESOURCE_NOT_FOUND:
stat = NC_EEMPTY;
break;
case Aws::S3::S3Errors::ACCESS_DENIED:
stat = NC_EACCESS;
/* fall thru */
default:
if(!stat) stat = NC_ES3;
if(errmsgp) *errmsgp = makeerrmsg(head_outcome.GetError(),key);
break;
}
}
return NCUNTRACEX(stat,"len=%d",(int)(lenp?*lenp:-1));
}
/*
@return NC_NOERR if success
@return NC_EXXX if fail
*/
EXTERNL int
NC_s3sdkread(void* s3client0, const char* bucket, const char* pathkey, size64_t start, size64_t count, void* content, char** errmsgp)
{
int stat = NC_NOERR;
char range[1024];
const char* key = NULL;
size64_t rangeend;
NCTRACE(11,"bucket=%s pathkey=%s start=%llu count=%llu content=%p",bucket,pathkey,start,count,content);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::GetObjectRequest object_request;
if(count == 0) return NCUNTRACE(stat);
if(*pathkey != '/') return NC_EINTERNAL;
if((stat = makes3key(pathkey,&key))) return NCUNTRACE(stat);
object_request.SetBucket(bucket);
object_request.SetKey(key);
rangeend = (start+count)-1;
snprintf(range,sizeof(range),"bytes=%llu-%llu",start,rangeend);
object_request.SetRange(range);
auto get_object_result = s3client->GetObject(object_request);
if(!get_object_result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(get_object_result.GetError(),key);
stat = NC_ES3;
} else {
/* Get the whole result */
Aws::IOStream &result = get_object_result.GetResultWithOwnership().GetBody();
std::string str((std::istreambuf_iterator<char>(result)),std::istreambuf_iterator<char>());
/* Verify actual result size */
size_t slen = str.size();
if(slen > count) return NC_ES3;
const char* s = str.c_str();
if(content)
memcpy(content,s,slen);
}
return NCUNTRACE(stat);
}
/*
For S3, I can see no way to do a byterange write;
so we are effectively writing the whole object
*/
EXTERNL int
NC_s3sdkwriteobject(void* s3client0, const char* bucket, const char* pathkey, size64_t count, const void* content, char** errmsgp)
{
int stat = NC_NOERR;
const char* key = NULL;
NCTRACE(11,"bucket=%s pathkey=%s count=%lld content=%p",bucket,pathkey,count,content);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::PutObjectRequest put_request;
if(*pathkey != '/') return NCUNTRACE(NC_EINTERNAL);
if((stat = makes3key(pathkey,&key))) return NCUNTRACE(stat);
if(errmsgp) *errmsgp = NULL;
put_request.SetBucket(bucket);
put_request.SetKey(key);
put_request.SetContentLength((long long)count);
std::shared_ptr<Aws::IOStream> data = std::shared_ptr<Aws::IOStream>(new Aws::StringStream());
data->rdbuf()->pubsetbuf((char*)content,count);
put_request.SetBody(data);
auto put_result = s3client->PutObject(put_request);
if(!put_result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(put_result.GetError(),key);
stat = NC_ES3;
}
return NCUNTRACE(stat);
}
EXTERNL int
NC_s3sdkclose(void* s3client0, NCS3INFO* info, int deleteit, char** errmsgp)
{
int stat = NC_NOERR;
NCTRACE(11,"info=%s rootkey=%s deleteit=%d",dumps3info(info),deleteit);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
if(deleteit) {
/* Delete the root key; ok it if does not exist */
switch (stat = NC_s3sdkdeletekey(s3client0,info->bucket,info->rootkey,errmsgp)) {
case NC_NOERR: break;
case NC_EEMPTY: case NC_ENOTFOUND: stat = NC_NOERR; break;
default: break;
}
}
delete s3client;
return NCUNTRACE(stat);
}
/*
Return a list of names of legal objects immediately below a specified key.
In theory, the returned list should be sorted in lexical order,
but it possible that it is not.
*/
EXTERNL int
NC_s3sdkgetkeys(void* s3client0, const char* bucket, const char* prefixkey0, size_t* nkeysp, char*** keysp, char** errmsgp)
{
int stat = NC_NOERR;
size_t nkeys = 0;
const char* prefix = NULL;
char* prefixdir = NULL;
char** realkeys = NULL;
char** commonkeys = NULL;
char** allkeys = NULL;
NCTRACE(11,"bucket=%s prefixkey0=%s",bucket,prefixkey0);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::ListObjectsV2Request objects_request;
if(*prefixkey0 != '/') return NCUNTRACE(NC_EINTERNAL);
/* Make sure that the prefix ends with '/' */
if((stat = makes3keydir(prefixkey0,&prefixdir))) return NCUNTRACE(stat);
/* remove leading '/' */
if((stat = makes3key(prefixdir,&prefix))) return NCUNTRACE(stat);
if(errmsgp) *errmsgp = NULL;
objects_request.SetBucket(bucket);
objects_request.SetPrefix(prefix);
objects_request.SetDelimiter("/"); /* Force return of common prefixes */
auto objects_outcome = s3client->ListObjectsV2(objects_request);
if(objects_outcome.IsSuccess()) {
size_t nrealkeys = 0;
size_t ncommonkeys = 0;
Aws::Vector<Aws::S3::Model::Object> object_list =
objects_outcome.GetResult().GetContents();
nrealkeys = (size_t)object_list.size();
stat = s3objectsinfo(object_list,NULL,&realkeys,NULL);
/* Add common prefixes */
Aws::Vector<Aws::S3::Model::CommonPrefix> common_list =
objects_outcome.GetResult().GetCommonPrefixes();
ncommonkeys = (size_t)common_list.size();
stat = s3commonprefixes(common_list,&commonkeys);
/* merge the two lists */
if((allkeys=mergekeysets(nrealkeys, realkeys, ncommonkeys, commonkeys))==NULL)
stat = NC_ENOMEM;
if(stat == NC_NOERR) {
if(nkeysp) {*nkeysp = nrealkeys + ncommonkeys;}
if(keysp) {*keysp = allkeys; allkeys = NULL;}
}
freestringenvv(allkeys);
freestringenvv(realkeys);
freestringenvv(commonkeys);
} else {
if(errmsgp) *errmsgp = makeerrmsg(objects_outcome.GetError());
stat = NC_ES3;
}
if(prefixdir) free(prefixdir);
return NCUNTRACEX(stat,"nkeys=%u",(unsigned)*nkeysp);
}
/*
Return a list of full keys of legal objects immediately below a specified key.
Not necessarily sorted.
*/
EXTERNL int
NC_s3sdksearch(void* s3client0, const char* bucket, const char* prefixkey0, size_t* nkeysp, char*** keysp, char** errmsgp)
{
int stat = NC_NOERR;
size_t nkeys = 0;
const char* prefix = NULL;
char* prefixdir = NULL;
char** keys = NULL;
NCTRACE(11,"bucket=%s prefixkey0=%s",bucket,prefixkey0);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::ListObjectsV2Request objects_request;
if(*prefixkey0 != '/') return NCUNTRACE(NC_EINTERNAL);
/* Make sure that the prefix ends with '/' */
if((stat = makes3keydir(prefixkey0,&prefixdir))) return NCUNTRACE(stat);
/* remove leading '/' */
if((stat = makes3key(prefixdir,&prefix))) return NCUNTRACE(stat);
if(errmsgp) *errmsgp = NULL;
objects_request.SetBucket(bucket);
objects_request.SetPrefix(prefix);
/* Do not use delimiter so we get all full key paths */
auto objects_outcome = s3client->ListObjectsV2(objects_request);
if(objects_outcome.IsSuccess()) {
size_t nkeys = 0;
Aws::Vector<Aws::S3::Model::Object> object_list =
objects_outcome.GetResult().GetContents();
nkeys = (size_t)object_list.size();
if((keys=(char**)calloc(sizeof(char*),(nkeys+1)))==NULL) /* NULL terminate list */
stat = NC_ENOMEM;
if(!stat) {
int i;
i = 0;
for (auto const &s3obj : object_list) {
const char* s;
const Aws::String& name = s3obj.GetKey();
s = name.c_str();
if(s != NULL) {
char* p;
size_t slen = name.length();
p = (char*)malloc(slen+1+1); /* nul plus leading '/' */
if(s[0] != '/') {p[0] = '/'; memcpy(p+1,s,slen); slen++;} else {memcpy(p,s,slen);}
p[slen] = '\0';
keys[i++] = p;
}
}
}
if(stat == NC_NOERR) {
if(nkeysp) {*nkeysp = nkeys;}
if(keysp) {*keysp = keys; keys = NULL;}
}
freestringenvv(keys);
} else {
if(errmsgp) *errmsgp = makeerrmsg(objects_outcome.GetError());
stat = NC_ES3;
}
if(prefixdir) free(prefixdir);
return NCUNTRACEX(stat,"nkeys=%u",(unsigned)*nkeysp);
}
EXTERNL int
NC_s3sdkdeletekey(void* s3client0, const char* bucket, const char* pathkey, char** errmsgp)
{
int stat = NC_NOERR;
const char* key = NULL;
NCTRACE(11,"bucket=%s pathkey=%s",bucket,pathkey);
Aws::S3::S3Client* s3client = (Aws::S3::S3Client*)s3client0;
Aws::S3::Model::DeleteObjectRequest delete_request;
if(*pathkey != '/') return NC_EINTERNAL;
if((stat = makes3key(pathkey,&key))) return NCUNTRACE(stat);
/* Delete this key object */
delete_request.SetBucket(bucket);
delete_request.SetKey(key);
auto delete_result = s3client->DeleteObject(delete_request);
if(!delete_result.IsSuccess()) {
if(errmsgp) *errmsgp = makeerrmsg(delete_result.GetError(),key);
stat = NC_ES3;
}
return NCUNTRACE(stat);
}
/*
Get Info about a single object from a vector
*/
static int
s3objectinfo1(const Aws::S3::Model::Object& s3_object, char** fullkeyp, size64_t* lenp)
{
int stat = NC_NOERR;
char* cstr = NULL;
if(fullkeyp) {
const char* key = NULL;
char* cstr = NULL;
auto s = s3_object.GetKey();
key = s.c_str();
if(key[0] == '/') {
cstr = strdup(key);
} else {
size_t len = strlen(key);
cstr = (char*)malloc(len+1+1);
if(cstr != NULL) {
cstr[0] = '/';
memcpy((void*)(cstr+1),(void*)key,len);
cstr[len+1] = '\0';
}
}
if(cstr == NULL) {
stat = NC_ENOMEM;
} else if(fullkeyp) {
*fullkeyp = cstr;
cstr = NULL;
}
}
if(!stat) {
if(lenp) *lenp = (size64_t)s3_object.GetSize();
}
if(cstr) free(cstr);
return stat;
}
/*
Get Info about a vector of objects; Keys are fixed up to start with a '/'
*/
static int
s3objectsinfo(Aws::Vector<Aws::S3::Model::Object> list, size_t* nkeysp, char*** keysp, size64_t** lenp)
{
int stat = NC_NOERR;
char** keys = NULL;
size_t nkeys;
size64_t *lengths = NULL;
int i;
nkeys = list.size();
if(nkeysp) *nkeysp = nkeys;
if((keys=(char**)calloc(sizeof(char*),(nkeys+1)))==NULL)
stat = NC_ENOMEM;
if(!stat) {
if((lengths=(size64_t*)calloc(sizeof(size64_t),(nkeys)))==NULL)
stat = NC_ENOMEM;
}
if(!stat) {
i = 0;
for (auto const &s3_object : list) {
stat = s3objectinfo1(s3_object,&keys[i],&lengths[i]);
i++;
if(stat) break;
}
}
if(!stat) {
if(keysp) {keys[nkeys] = NULL; *keysp = keys; keys = NULL;}
if(lenp) {*lenp = lengths; lengths = NULL;}
}
if(keys != NULL) freestringenvv(keys);
if(lengths != NULL) free(lengths);
return stat;
}
static int
s3commonprefixes(Aws::Vector<Aws::S3::Model::CommonPrefix> list, char*** keysp)
{
int stat = NC_NOERR;
char** keys = NULL;
size_t nkeys;
int i;
nkeys = list.size();
if((keys=(char**)calloc(sizeof(char*),(nkeys+1)))==NULL)
stat = NC_ENOMEM;
if(!stat) {
i = 0;
for (auto const &s3prefix : list) {
char* p; char* p1;
size_t len;
const Aws::String& prefix = s3prefix.GetPrefix();
len = prefix.length();
if((p = (char*) malloc(len+1+1))==NULL) /* for nul + leading '/' */
stat = NC_ENOMEM;
if(stat == NC_NOERR) {
if(*p == '/') {p1 = p;} else {*p = '/'; p1 = p+1;}
memcpy(p1,prefix.c_str(),len);
p1[len] = '\0';
keys[i++] = p;
}
}
}
if(keysp) {keys[nkeys] = NULL; *keysp = keys; keys = NULL;}
if(keys != NULL) freestringenvv(keys);
return stat;
}
static Aws::S3::Model::BucketLocationConstraint
s3findregion(const char* name)
{
return Aws::S3::Model::BucketLocationConstraintMapper::GetBucketLocationConstraintForName(name);
}
struct MemBuf: std::streambuf {
MemBuf(char* base, size_t size) {
char* p(base);
this->setg(p, p, p + size);
}
};
static void
freestringenvv(char** ss)
{
char** p;
if(ss != NULL) {
for(p=ss;*p;p++)
if(*p) free(*p);
free(ss);
}
}
static int
makes3key(const char* pathkey, const char** keyp)
{
assert(pathkey != NULL && pathkey[0] == '/');
if(keyp) *keyp = pathkey+1;
return NC_NOERR;
}
static int
makes3keydir(const char* prefix, char** prefixdirp)
{
size_t plen = strlen(prefix);
char* prefixdir = (char*)malloc(plen+1+1); /* '/' + nul */
if(prefixdir == NULL) return NC_ENOMEM;
memcpy(prefixdir,prefix,plen);
if(prefixdir[plen-1] != '/') {
prefixdir[plen++] = '/';
}
prefixdir[plen] = '\0';
*prefixdirp = prefixdir; prefixdir = NULL;
return NC_NOERR;
}
static char**
mergekeysets(size_t nkeys1, char** keys1, size_t nkeys2, char** keys2)
{
char** merge = NULL;
char** p1;
char** p2;
merge = (char**)malloc(sizeof(char*)*(nkeys1+nkeys2+1));
if(merge == NULL) return NULL;
if(nkeys1 > 0) {
memcpy(merge,keys1,sizeof(char*)*nkeys1);
/* avoid double free */
memset(keys1,0,sizeof(char*)*nkeys1);
}
if(nkeys2 > 0) {
memcpy(merge+nkeys1,keys2,sizeof(char*)*nkeys2);
/* avoid double free */
memset(keys2,0,sizeof(char*)*nkeys2);
}
merge[nkeys1+nkeys2] = NULL;
return merge;
}
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