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annotate libiberty/memmem.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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rev   line source
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1830386684a0 gcc-9.2.0
anatofuz
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1 /* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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2 This file is part of the GNU C Library.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License along
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15 with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 /*
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19
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20 @deftypefn Supplemental void* memmem (const void *@var{haystack}, @
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21 size_t @var{haystack_len} const void *@var{needle}, size_t @var{needle_len})
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22
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23 Returns a pointer to the first occurrence of @var{needle} (length
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24 @var{needle_len}) in @var{haystack} (length @var{haystack_len}).
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25 Returns @code{NULL} if not found.
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26
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27 @end deftypefn
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28
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29 */
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30
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31 #ifndef _LIBC
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32 # include <config.h>
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33 #endif
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34
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35 #include <stddef.h>
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36 #include <string.h>
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37
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38 #ifndef _LIBC
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39 # define __builtin_expect(expr, val) (expr)
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40 #endif
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41
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42 #undef memmem
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43
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44 /* Return the first occurrence of NEEDLE in HAYSTACK. */
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45 void *
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46 memmem (const void *haystack, size_t haystack_len, const void *needle,
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47 size_t needle_len)
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48 {
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49 const char *begin;
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50 const char *const last_possible
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51 = (const char *) haystack + haystack_len - needle_len;
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52
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53 if (needle_len == 0)
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54 /* The first occurrence of the empty string is deemed to occur at
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55 the beginning of the string. */
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56 return (void *) haystack;
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57
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58 /* Sanity check, otherwise the loop might search through the whole
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59 memory. */
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60 if (__builtin_expect (haystack_len < needle_len, 0))
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61 return NULL;
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62
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63 for (begin = (const char *) haystack; begin <= last_possible; ++begin)
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64 if (begin[0] == ((const char *) needle)[0] &&
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65 !memcmp ((const void *) &begin[1],
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66 (const void *) ((const char *) needle + 1),
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67 needle_len - 1))
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68 return (void *) begin;
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69
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70 return NULL;
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71 }