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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
// Miscellaneous utility functions.
//
#include <utils/misc.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <stdio.h>
using namespace android;
namespace android {
/*
* Like strdup(), but uses C++ "new" operator instead of malloc.
*/
char* strdupNew(const char* str)
{
char* newStr;
int len;
if (str == NULL)
return NULL;
len = strlen(str);
newStr = new char[len+1];
memcpy(newStr, str, len+1);
return newStr;
}
/*
* Concatenate an argument vector.
*/
char* concatArgv(int argc, const char* const argv[])
{
char* newStr = NULL;
int len, totalLen, posn, idx;
/*
* First, figure out the total length.
*/
totalLen = idx = 0;
while (1) {
if (idx == argc || argv[idx] == NULL)
break;
if (idx)
totalLen++; // leave a space between args
totalLen += strlen(argv[idx]);
idx++;
}
/*
* Alloc the string.
*/
newStr = new char[totalLen +1];
if (newStr == NULL)
return NULL;
/*
* Finally, allocate the string and copy data over.
*/
idx = posn = 0;
while (1) {
if (idx == argc || argv[idx] == NULL)
break;
if (idx)
newStr[posn++] = ' ';
len = strlen(argv[idx]);
memcpy(&newStr[posn], argv[idx], len);
posn += len;
idx++;
}
assert(posn == totalLen);
newStr[posn] = '\0';
return newStr;
}
/*
* Count the #of args in an argument vector. Don't count the final NULL.
*/
int countArgv(const char* const argv[])
{
int count = 0;
while (argv[count] != NULL)
count++;
return count;
}
#include <stdio.h>
/*
* Get a file's type.
*/
FileType getFileType(const char* fileName)
{
struct stat sb;
if (stat(fileName, &sb) < 0) {
if (errno == ENOENT || errno == ENOTDIR)
return kFileTypeNonexistent;
else {
fprintf(stderr, "getFileType got errno=%d on '%s'\n",
errno, fileName);
return kFileTypeUnknown;
}
} else {
if (S_ISREG(sb.st_mode))
return kFileTypeRegular;
else if (S_ISDIR(sb.st_mode))
return kFileTypeDirectory;
else if (S_ISCHR(sb.st_mode))
return kFileTypeCharDev;
else if (S_ISBLK(sb.st_mode))
return kFileTypeBlockDev;
else if (S_ISFIFO(sb.st_mode))
return kFileTypeFifo;
#ifdef HAVE_SYMLINKS
else if (S_ISLNK(sb.st_mode))
return kFileTypeSymlink;
else if (S_ISSOCK(sb.st_mode))
return kFileTypeSocket;
#endif
else
return kFileTypeUnknown;
}
}
/*
* Get a file's modification date.
*/
time_t getFileModDate(const char* fileName)
{
struct stat sb;
if (stat(fileName, &sb) < 0)
return (time_t) -1;
return sb.st_mtime;
}
/*
* Round up to the next highest power of 2.
*
* Found on http://graphics.stanford.edu/~seander/bithacks.html.
*/
unsigned int roundUpPower2(unsigned int val)
{
val--;
val |= val >> 1;
val |= val >> 2;
val |= val >> 4;
val |= val >> 8;
val |= val >> 16;
val++;
return val;
}
}; // namespace android
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