| 1 | /* xmemdup.c -- Duplicate a memory buffer, using xmalloc. |
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| 2 | This trivial function is in the public domain. |
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| 3 | Jeff Garzik, September 1999. */ |
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| 4 | |
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| 5 | /* |
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| 6 | |
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| 7 | @deftypefn Replacement void* xmemdup (void *@var{input}, @ |
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| 8 | size_t @var{copy_size}, size_t @var{alloc_size}) |
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| 9 | |
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| 10 | Duplicates a region of memory without fail. First, @var{alloc_size} bytes |
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| 11 | are allocated, then @var{copy_size} bytes from @var{input} are copied into |
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| 12 | it, and the new memory is returned. If fewer bytes are copied than were |
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| 13 | allocated, the remaining memory is zeroed. |
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| 14 | |
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| 15 | @end deftypefn |
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| 16 | |
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| 17 | */ |
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| 18 | |
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| 19 | #ifdef HAVE_CONFIG_H |
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| 20 | #include "config.h" |
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| 21 | #endif |
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| 22 | #include "ansidecl.h" |
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| 23 | #include "libiberty.h" |
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| 24 | |
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| 25 | #include <sys/types.h> /* For size_t. */ |
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| 26 | #ifdef HAVE_STRING_H |
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| 27 | #include <string.h> |
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| 28 | #else |
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| 29 | # ifdef HAVE_STRINGS_H |
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| 30 | # include <strings.h> |
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| 31 | # endif |
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| 32 | #endif |
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| 33 | |
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| 34 | void * |
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| 35 | xmemdup (const void *input, size_t copy_size, size_t alloc_size) |
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| 36 | { |
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| 37 | void *output = xmalloc (alloc_size); |
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| 38 | if (alloc_size > copy_size) |
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| 39 | memset (s: (char *) output + copy_size, c: 0, n: alloc_size - copy_size); |
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| 40 | return (void *) memcpy (dest: output, src: input, n: copy_size); |
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| 41 | } |
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| 42 | |
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