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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| /**************************************************************************** | ||
| * lib/string/lib_strstr.c | ||
| * | ||
| * Copyright (C) 2012 Gregory Nutt. All rights reserved. | ||
| * Author: Gregory Nutt <gnutt@nuttx.org> | ||
| * | ||
| * Redistribution and use str source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions str binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer str | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * 3. Neither the name NuttX nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software | ||
| * without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
|
|
||
| #include <nuttx/config.h> | ||
|
|
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| #include <string.h> | ||
| #include <ctype.h> | ||
|
|
||
| /**************************************************************************** | ||
| * Private Functions | ||
| ****************************************************************************/ | ||
|
|
||
| static FAR char *strcasechr(FAR const char *s, int uc) | ||
| { | ||
| register char ch; | ||
|
|
||
| if (s) | ||
| { | ||
| for (; *s; s++) | ||
| { | ||
| ch = *s; | ||
| if (toupper(ch) == uc) | ||
| { | ||
| return (FAR char*)s; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return NULL; | ||
| } | ||
|
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||
| /**************************************************************************** | ||
| * Global Functions | ||
| ****************************************************************************/ | ||
|
|
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| FAR char *strcasestr(FAR const char *str, FAR const char *substr) | ||
| { | ||
| const char *candidate; /* Candidate in str with matching start character */ | ||
| char ch; /* First character of the substring */ | ||
| int len; /* The length of the substring */ | ||
|
|
||
| /* Special case the empty substring */ | ||
|
|
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| len = strlen(substr); | ||
| ch = *substr; | ||
|
|
||
| if (!ch) | ||
| { | ||
| /* We'll say that an empty substring matches at the beginning of | ||
| * the string | ||
| */ | ||
|
|
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| return (char*)str; | ||
| } | ||
|
|
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| /* Search for the substring */ | ||
|
|
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| candidate = str; | ||
| ch = toupper(ch); | ||
|
|
||
| for (;;) | ||
| { | ||
| /* strcasechr() will return a pointer to the next occurrence of the | ||
| * character ch in the string (ignoring case) | ||
| */ | ||
|
|
||
| candidate = strcasechr(candidate, ch); | ||
| if (!candidate || strlen(candidate) < len) | ||
| { | ||
| /* First character of the substring does not appear in the string | ||
| * or the remainder of the string is not long enough to contain the | ||
| * substring. | ||
| */ | ||
|
|
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| return NULL; | ||
| } | ||
|
|
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| /* Check if this is the beginning of a matching substring (ignoring case) */ | ||
|
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| if (strncasecmp(candidate, substr, len) == 0) | ||
| { | ||
| /* Yes.. return the pointer to the first occurrence of the matching | ||
| * substring. | ||
| */ | ||
|
|
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| return (char*)candidate; | ||
| } | ||
|
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| /* No, find the next candidate after this one */ | ||
|
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| candidate++; | ||
| } | ||
|
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| /* Won't get here, but some compilers might complain */ | ||
|
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| return NULL; | ||
| } | ||
|
|