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