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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-02-03 16:41:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-02-03 16:41:28 +0000 |
commit | 13ff49d906592afcec0c170572411693c8e26d13 (patch) | |
tree | 361e13367ebb2e709a262417905d9c3ea346f545 /nuttx/lib | |
parent | 16166e4a5ea25f9c01784a11162de92156b5b872 (diff) | |
download | px4-nuttx-13ff49d906592afcec0c170572411693c8e26d13.tar.gz px4-nuttx-13ff49d906592afcec0c170572411693c8e26d13.tar.bz2 px4-nuttx-13ff49d906592afcec0c170572411693c8e26d13.zip |
Add strcasestr()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4364 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/lib')
-rw-r--r-- | nuttx/lib/string/Make.defs | 2 | ||||
-rw-r--r-- | nuttx/lib/string/lib_strcasestr.c | 134 |
2 files changed, 135 insertions, 1 deletions
diff --git a/nuttx/lib/string/Make.defs b/nuttx/lib/string/Make.defs index d3f1eed3a..246b05381 100644 --- a/nuttx/lib/string/Make.defs +++ b/nuttx/lib/string/Make.defs @@ -38,6 +38,6 @@ STRING_SRCS = lib_checkbase.c lib_isbasedigit.c lib_memset.c lib_memcpy.c \ lib_strcat.c lib_strchr.c lib_strcpy.c lib_strcmp.c lib_strcspn.c \ lib_strdup.c lib_strerror.c lib_strlen.c lib_strnlen.c \ lib_strncasecmp.c lib_strncat.c lib_strncmp.c lib_strncpy.c \ - lib_strndup.c lib_strpbrk.c lib_strrchr.c lib_strspn.c \ + lib_strndup.c lib_strcasestr.c lib_strpbrk.c lib_strrchr.c lib_strspn.c \ lib_strstr.c lib_strtok.c lib_strtokr.c lib_strtol.c lib_strtoll.c \ lib_strtoul.c lib_strtoull.c lib_strtod.c diff --git a/nuttx/lib/string/lib_strcasestr.c b/nuttx/lib/string/lib_strcasestr.c new file mode 100644 index 000000000..23f0ab57e --- /dev/null +++ b/nuttx/lib/string/lib_strcasestr.c @@ -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> + +#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; +} + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +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 */ + + len = strlen(substr); + ch = *substr; + + if (!ch) + { + /* We'll say that an empty substring matches at the beginning of + * the string + */ + + return (char*)str; + } + + /* Search for the substring */ + + 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. + */ + + return NULL; + } + + /* Check if this is the beginning of a matching substring (ignoring case) */ + + if (strncasecmp(candidate, substr, len) == 0) + { + /* Yes.. return the pointer to the first occurrence of the matching + * substring. + */ + + return (char*)candidate; + } + + /* No, find the next candidate after this one */ + + candidate++; + } + + /* Won't get here, but some compilers might complain */ + + return NULL; +} + |