Returns the length of the maximum initial segment of the null-terminated byte string pointed to by dest, that consists of only the characters not 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.
The length of the maximum initial segment that contains only characters not found in the null-terminated byte string pointed to by src
The function name stands for "complementary span" because the function searches for characters not found in src, that is the complement of src.
#include <string.h>
#include <stdio.h>
int main(void)
{
const char *string = "abcde312$#@";
const char *invalid = "*$#";
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);
}
Output:
'abcde312$#@' contains invalid chars starting at position 8[edit] References
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