Returns the length of the maximum initial segment of the null-terminated byte string pointed to bydest, that consists of only the charactersnot found in the null-terminated byte string pointed to bysrc.

The behavior is undefined if eitherdest orsrc 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 not found in the null-terminated byte string pointed to bysrc

[edit]Notes

The function name stands for "complementary span" because the function searches for characters not found insrc, that is the complement ofsrc.

[edit]Example

#include <string.h>#include <stdio.h> int main(void){constchar*string="abcde312$#@";constchar*invalid="*$#"; size_t valid_len= strcspn(string, invalid);if(valid_len!=strlen(string))printf("'%s' contains invalid chars starting at position %zu\n",               string, valid_len);}

'abcde312$#@' contains invalid chars starting at position 8

[edit]References

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