char* strstr( const char* str, const char* substr );
(1)/*QChar*/* strstr( /*QChar*/* str, const char* substr );
(2) (since C23)1) Finds the first occurrence of the null-terminated byte string pointed to by substr in the null-terminated byte string pointed to by str. The terminating null characters are not compared.
2)Type-generic function equivalent to
(1). Let
T
be an unqualified character object type.
str is of type const T*, the return type is const char*.str is of type T*, the return type is char*.If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if
(strstr)or a function pointer is used), the actual function declaration
(1)becomes visible.
The behavior is undefined if either str or substr is not a pointer to a null-terminated byte string.
[edit] Parameters str - pointer to the null-terminated byte string to examine substr - pointer to the null-terminated byte string to search for [edit] Return valuePointer to the first character of the found substring in str, or a null pointer if such substring is not found. If substr points to an empty string, str is returned.
[edit] Example#include <stdio.h>
#include <string.h>
void find_str(char const* str, char const* substr)
{
char const* pos = strstr(str, substr);
if (pos)
printf(
"Found the string [%s] in [%s] at position %td\n",
substr, str, pos - str
);
else
printf(
"The string [%s] was not found in [%s]\n",
substr, str
);
}
int main(void)
{
char const* str = "one two three";
find_str(str, "two");
find_str(str, "");
find_str(str, "nine");
find_str(str, "n");
return 0;
}
Output:
Found the string [two] in [one two three] at position 4 Found the string [] in [one two three] at position 0 The string [nine] was not found in [one two three] Found the string [n] in [one two three] at position 1[edit] References
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