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31 lines
962 B
31 lines
962 B
diff --git a/src/system.c b/src/system.c |
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index ba4ac2d..ea88cd6 100644 |
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--- a/src/system.c |
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+++ b/src/system.c |
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@@ -231,8 +231,25 @@ sys_compare_links (struct stat *link_data, struct stat *stat_data) |
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int |
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sys_truncate (int fd) |
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{ |
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+ struct stat st; |
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off_t pos = lseek (fd, (off_t) 0, SEEK_CUR); |
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- return pos < 0 ? -1 : ftruncate (fd, pos); |
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+ |
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+ if ( pos < 0) |
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+ return -1; |
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+ |
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+ if ( ftruncate(fd, pos) && errno == EPERM ) { |
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+ /* wrapper around ftruncate: |
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+ * ftruncate may fail to grow the size of a file with some OS and filesystem |
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+ * combinations. Linux and vfat/fat is one example. If this is the case do |
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+ * a write to grow the file to the desired length. |
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+ */ |
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+ if( (fstat( fd, &st ) == -1) || |
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+ (st.st_size >= pos) || |
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+ (lseek( fd, pos - 1, SEEK_SET) == (off_t)-1) || |
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+ (write( fd, "\0", 1) == -1) ) |
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+ return -1; |
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+ } |
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+ return 0; |
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} |
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/* Return nonzero if NAME is the name of a regular file, or if the file
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