strspn - cppreference.com (original) (raw)

| | | | | ----------------------------------------------------------------------------------- | | | | size_t strspn( const char* dest, const char* src ); | | |

Returns the length of the maximum initial segment (span) of the null-terminated byte string pointed to by dest, that consists of only the characters found in the null-terminated byte string pointed to by src.

The behavior is undefined if either dest or src is not a pointer to a null-terminated byte string.

[edit] Parameters

[edit] Return value

The length of the maximum initial segment that contains only characters from the null-terminated byte string pointed to by src.

[edit] Example

#include <stdio.h> #include <string.h>   int main(void) { const char* string = "abcde312$#@"; const char* low_alpha = "qwertyuiopasdfghjklzxcvbnm";   size_t spnsz = strspn(string, low_alpha); printf("After skipping initial lowercase letters from '%s'\n" "The remainder is '%s'\n", string, string + spnsz); }

Output:

After skipping initial lowercase letters from 'abcde312$#@' The remainder is '312$#@'

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• 7.24.5.6 The strspn function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.24.5.6 The strspn function (p: TBD)

• C11 standard (ISO/IEC 9899:2011):

• 7.24.5.6 The strspn function (p: 369)

• C99 standard (ISO/IEC 9899:1999):

• 7.21.5.6 The strspn function (p: 332)

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

• 4.11.5.6 The strspn function

[edit] See also

| | returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function) [edit] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | returns the length of the maximum initial segment that consists of only the wide characters found in another wide string (function) [edit] | | | finds the first location of any character in one string, in another string (function) [edit] | | |