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68 lines
1.5 KiB
68 lines
1.5 KiB
/* |
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* Copyright 2011, 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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#include <fcntl.h> |
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#include <sys/ioctl.h> |
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#include <sys/mount.h> /* for BLKGETSIZE */ |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <cutils/properties.h> |
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static int only_one_char(char *buf, int len, char c) |
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{ |
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int i, ret; |
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ret = 1; |
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for (i=0; i<len; i++) { |
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if (buf[i] != c) { |
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ret = 0; |
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break; |
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} |
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} |
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return ret; |
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} |
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int partition_wiped(char *source) |
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{ |
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char buf[4096]; |
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int fd, ret; |
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if ((fd = open(source, O_RDONLY)) < 0) { |
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return 0; |
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} |
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ret = read(fd, buf, sizeof(buf)); |
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close(fd); |
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if (ret != sizeof(buf)) { |
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return 0; |
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} |
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/* Check for all zeros */ |
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if (only_one_char(buf, sizeof(buf), 0)) { |
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return 1; |
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} |
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/* Check for all ones */ |
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if (only_one_char(buf, sizeof(buf), 0xff)) { |
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return 1; |
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} |
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return 0; |
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} |
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