FUNCTION: str_search DESCRIPTION: takes two C strings: a "source string" s[] and a "pattern string" and determines if the given pattern is a substring of s. If the pattern is a substring of s, the index into s where the first match occurs is returned (note that the pattern may occur multiple times in s). Otherwise, -1 is returned (note that a match could start at index 0, so we can't use 0 for "false"). Estimated Difficulty: LEVEL 3 Examples: source string s pattern return-value "abcd" "ab" "abcd" "aa" -1 "abc bc d" "bc" 1 "abcd" "bcd" "abcd" "bcd" "abracadabra" "dab" 6. "abc" "abc" "abc" "abcd" NOTES: every string is a substring of itself if the pattern is longer than the source string, of course there can be no match. - remember there may be multiple matches - you want the index of the first match. You may use the strlen library function (but you don't really need it) but all other library functions RULES:
FUNCTION: str_search DESCRIPTION: takes two C strings: a "source string" s[] and a "pattern string" and determines if the given pattern is a substring of s. If the pattern is a substring of s, the index into s where the first match occurs is returned (note that the pattern may occur multiple times in s). Otherwise, -1 is returned (note that a match could start at index 0, so we can't use 0 for "false"). Estimated Difficulty: LEVEL 3 Examples: source string s pattern return-value "abcd" "ab" "abcd" "aa" -1 "abc bc d" "bc" 1 "abcd" "bcd" "abcd" "bcd" "abracadabra" "dab" 6. "abc" "abc" "abc" "abcd" NOTES: every string is a substring of itself if the pattern is longer than the source string, of course there can be no match. - remember there may be multiple matches - you want the index of the first match. You may use the strlen library function (but you don't really need it) but all other library functions RULES:
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Write a str search function in C language.
![* FUNCTION:
str_search
takes two C strings: a "source string" s[] and
a "pattern string" and determines if the given
DESCRIPTION:
pattern is a substring of s.
If the pattern is a substring of s, the index into s where
the first match occurs is returned (note that the
pattern may occur multiple times in s).
Otherwise, -1 is returned (note that a match could
start at index 0, so we can't use e for "false").
Estimated Difficulty: LEVEL 3
Examples:
source string s
pattern
return-value
"ab"
"aa"
"abcd"
"abcd"
-1
"abc bc d"
"bc"
1.
"abcd"
"bcd"
1
"abcd"
"bcd"
1
"abracadabra"
"dab"
"abc"
"abc"
"abc"
"abcd"
-1
NOTES:
every string is a substring of itself
if the pattern is longer than the source string,
of course there can be no match.
remember there may be multiple matches
you want
the index of the first match.
You may use the strlen library function (but you don't
really need it) but all other library functions
RULES:
operating on strings are off limits!
*/
int str_search(char *s, char *pattern);](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F672bf286-8abe-4b07-9ca1-0d5b2612956c%2F063503c1-049f-481a-b17b-40e9051f9f06%2F5yca8qj_processed.png&w=3840&q=75)
Transcribed Image Text:* FUNCTION:
str_search
takes two C strings: a "source string" s[] and
a "pattern string" and determines if the given
DESCRIPTION:
pattern is a substring of s.
If the pattern is a substring of s, the index into s where
the first match occurs is returned (note that the
pattern may occur multiple times in s).
Otherwise, -1 is returned (note that a match could
start at index 0, so we can't use e for "false").
Estimated Difficulty: LEVEL 3
Examples:
source string s
pattern
return-value
"ab"
"aa"
"abcd"
"abcd"
-1
"abc bc d"
"bc"
1.
"abcd"
"bcd"
1
"abcd"
"bcd"
1
"abracadabra"
"dab"
"abc"
"abc"
"abc"
"abcd"
-1
NOTES:
every string is a substring of itself
if the pattern is longer than the source string,
of course there can be no match.
remember there may be multiple matches
you want
the index of the first match.
You may use the strlen library function (but you don't
really need it) but all other library functions
RULES:
operating on strings are off limits!
*/
int str_search(char *s, char *pattern);
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