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strspn

From natekohl.net
< c‎ | string‎ | byte
Defined in header <string.h>
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.

Contents

[edit] Parameters

dest - pointer to the null-terminated byte string to be analyzed
src - pointer to the null-terminated byte string that contains the characters to search for

[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 <string.h>
#include <stdio.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

  • 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]
(C95)
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]