strchr - cppreference.com (original) (raw)

1. Finds the first occurrence of ch (after conversion to char as if by (char)ch) in the null-terminated byte string pointed to by str (each character interpreted as unsigned char). The terminating null character is considered to be a part of the string and can be found when searching for '\0'.

2. Type-generic function equivalent to (1). Let T be an unqualified character object type.

• If str is of type const T*, the return type is const char*.
• Otherwise, if str is of type T*, the return type is char*.
• Otherwise, the behavior is undefined.

If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if (strchr) or a function pointer is used), the actual function declaration (1) becomes visible.

The behavior is undefined if str is not a pointer to a null-terminated byte string.

[edit] Parameters

[edit] Return value

Pointer to the found character in str, or null pointer if no such character is found.

[edit] Example

#include <stdio.h> #include <string.h>   int main(void) { const char str = "Try not. Do, or do not. There is no try."; char target = 'T'; const char result = str;   while((result = strchr(result, target)) != NULL) { printf("Found '%c' starting at '%s'\n", target, result); ++result; // Increment result, otherwise we'll find target at the same location } }

Output:

Found 'T' starting at 'Try not. Do, or do not. There is no try.' Found 'T' starting at 'There is no try.'

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• 7.24.5.2 The strchr function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.24.5.2 The strchr function (p: TBD)

• C11 standard (ISO/IEC 9899:2011):

• 7.24.5.2 The strchr function (p: 367-368)

• C99 standard (ISO/IEC 9899:1999):

• 7.21.5.2 The strchr function (p: 330)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.11.5.2 The strchr function

[edit] See also

| | searches an array for the first occurrence of a character (function) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | finds the last occurrence of a character (function) [edit] | | | finds the first location of any character in one string, in another string (function) [edit] | | |