The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | // |
| 18 | // Miscellaneous utility functions. |
| 19 | // |
| 20 | #include <utils/misc.h> |
| 21 | |
| 22 | #include <sys/stat.h> |
| 23 | #include <string.h> |
| 24 | #include <errno.h> |
| 25 | #include <assert.h> |
| 26 | #include <stdio.h> |
| 27 | |
| 28 | using namespace android; |
| 29 | |
| 30 | namespace android { |
| 31 | |
| 32 | /* |
| 33 | * Like strdup(), but uses C++ "new" operator instead of malloc. |
| 34 | */ |
| 35 | char* strdupNew(const char* str) |
| 36 | { |
| 37 | char* newStr; |
| 38 | int len; |
| 39 | |
| 40 | if (str == NULL) |
| 41 | return NULL; |
| 42 | |
| 43 | len = strlen(str); |
| 44 | newStr = new char[len+1]; |
| 45 | memcpy(newStr, str, len+1); |
| 46 | |
| 47 | return newStr; |
| 48 | } |
| 49 | |
| 50 | /* |
| 51 | * Concatenate an argument vector. |
| 52 | */ |
| 53 | char* concatArgv(int argc, const char* const argv[]) |
| 54 | { |
| 55 | char* newStr = NULL; |
| 56 | int len, totalLen, posn, idx; |
| 57 | |
| 58 | /* |
| 59 | * First, figure out the total length. |
| 60 | */ |
| 61 | totalLen = idx = 0; |
| 62 | while (1) { |
| 63 | if (idx == argc || argv[idx] == NULL) |
| 64 | break; |
| 65 | if (idx) |
| 66 | totalLen++; // leave a space between args |
| 67 | totalLen += strlen(argv[idx]); |
| 68 | idx++; |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Alloc the string. |
| 73 | */ |
| 74 | newStr = new char[totalLen +1]; |
| 75 | if (newStr == NULL) |
| 76 | return NULL; |
| 77 | |
| 78 | /* |
| 79 | * Finally, allocate the string and copy data over. |
| 80 | */ |
| 81 | idx = posn = 0; |
| 82 | while (1) { |
| 83 | if (idx == argc || argv[idx] == NULL) |
| 84 | break; |
| 85 | if (idx) |
| 86 | newStr[posn++] = ' '; |
| 87 | |
| 88 | len = strlen(argv[idx]); |
| 89 | memcpy(&newStr[posn], argv[idx], len); |
| 90 | posn += len; |
| 91 | |
| 92 | idx++; |
| 93 | } |
| 94 | |
| 95 | assert(posn == totalLen); |
| 96 | newStr[posn] = '\0'; |
| 97 | |
| 98 | return newStr; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Count the #of args in an argument vector. Don't count the final NULL. |
| 103 | */ |
| 104 | int countArgv(const char* const argv[]) |
| 105 | { |
| 106 | int count = 0; |
| 107 | |
| 108 | while (argv[count] != NULL) |
| 109 | count++; |
| 110 | |
| 111 | return count; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | #include <stdio.h> |
| 116 | /* |
| 117 | * Get a file's type. |
| 118 | */ |
| 119 | FileType getFileType(const char* fileName) |
| 120 | { |
| 121 | struct stat sb; |
| 122 | |
| 123 | if (stat(fileName, &sb) < 0) { |
| 124 | if (errno == ENOENT || errno == ENOTDIR) |
| 125 | return kFileTypeNonexistent; |
| 126 | else { |
| 127 | fprintf(stderr, "getFileType got errno=%d on '%s'\n", |
| 128 | errno, fileName); |
| 129 | return kFileTypeUnknown; |
| 130 | } |
| 131 | } else { |
| 132 | if (S_ISREG(sb.st_mode)) |
| 133 | return kFileTypeRegular; |
| 134 | else if (S_ISDIR(sb.st_mode)) |
| 135 | return kFileTypeDirectory; |
| 136 | else if (S_ISCHR(sb.st_mode)) |
| 137 | return kFileTypeCharDev; |
| 138 | else if (S_ISBLK(sb.st_mode)) |
| 139 | return kFileTypeBlockDev; |
| 140 | else if (S_ISFIFO(sb.st_mode)) |
| 141 | return kFileTypeFifo; |
| 142 | #ifdef HAVE_SYMLINKS |
| 143 | else if (S_ISLNK(sb.st_mode)) |
| 144 | return kFileTypeSymlink; |
| 145 | else if (S_ISSOCK(sb.st_mode)) |
| 146 | return kFileTypeSocket; |
| 147 | #endif |
| 148 | else |
| 149 | return kFileTypeUnknown; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Get a file's modification date. |
| 155 | */ |
| 156 | time_t getFileModDate(const char* fileName) |
| 157 | { |
| 158 | struct stat sb; |
| 159 | |
| 160 | if (stat(fileName, &sb) < 0) |
| 161 | return (time_t) -1; |
| 162 | |
| 163 | return sb.st_mtime; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Round up to the next highest power of 2. |
| 168 | * |
| 169 | * Found on http://graphics.stanford.edu/~seander/bithacks.html. |
| 170 | */ |
| 171 | unsigned int roundUpPower2(unsigned int val) |
| 172 | { |
| 173 | val--; |
| 174 | val |= val >> 1; |
| 175 | val |= val >> 2; |
| 176 | val |= val >> 4; |
| 177 | val |= val >> 8; |
| 178 | val |= val >> 16; |
| 179 | val++; |
| 180 | |
| 181 | return val; |
| 182 | } |
| 183 | |
| 184 | }; // namespace android |
| 185 | |