Mercurial > hg > CbC > CbC_gcc
annotate libiberty/memmem.c @ 66:b362627d71ba
bug-fix: modify tail-call-optimization enforcing rules. (calls.c.)
author | Ryoma SHINYA <shinya@firefly.cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 14 Dec 2010 03:58:33 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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1 /* Copyright (C) 1991,92,93,94,96,97,98,2000,2004,2007 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}, size_t @var{haystack_len} const void *@var{needle}, size_t @var{needle_len}) |
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21 |
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22 Returns a pointer to the first occurrence of @var{needle} (length |
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23 @var{needle_len}) in @var{haystack} (length @var{haystack_len}). |
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24 Returns @code{NULL} if not found. |
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25 |
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26 @end deftypefn |
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27 |
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28 */ |
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29 |
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30 #ifndef _LIBC |
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31 # include <config.h> |
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32 #endif |
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33 |
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34 #include <stddef.h> |
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35 #include <string.h> |
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36 |
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37 #ifndef _LIBC |
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38 # define __builtin_expect(expr, val) (expr) |
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39 #endif |
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40 |
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41 #undef memmem |
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42 |
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43 /* Return the first occurrence of NEEDLE in HAYSTACK. */ |
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44 void * |
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45 memmem (const void *haystack, size_t haystack_len, const void *needle, |
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46 size_t needle_len) |
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47 { |
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48 const char *begin; |
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49 const char *const last_possible |
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50 = (const char *) haystack + haystack_len - needle_len; |
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51 |
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52 if (needle_len == 0) |
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53 /* The first occurrence of the empty string is deemed to occur at |
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54 the beginning of the string. */ |
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55 return (void *) haystack; |
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56 |
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57 /* Sanity check, otherwise the loop might search through the whole |
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58 memory. */ |
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59 if (__builtin_expect (haystack_len < needle_len, 0)) |
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60 return NULL; |
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61 |
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62 for (begin = (const char *) haystack; begin <= last_possible; ++begin) |
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63 if (begin[0] == ((const char *) needle)[0] && |
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64 !memcmp ((const void *) &begin[1], |
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65 (const void *) ((const char *) needle + 1), |
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66 needle_len - 1)) |
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67 return (void *) begin; |
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68 |
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69 return NULL; |
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70 } |