strspn strcspn
#ifndef __HAVE_ARCH_STRSPN /** * strspn - Calculate the length of the initial substring of @s which only contain letters in @accept * @s: The string to be searched * @accept: The string to search for */ size_t strspn(const char *s, const char *accept) { const char *p; const char *a; size_t count = 0; for (p = s; *p != '\0'; ++p) { for (a = accept; *a != '\0'; ++a) { if (*p == *a) break; } if (*a == '\0') return count; ++count; } return count; EXPORT_SYMBOL(strspn); #endif
strcspn
#ifndef __HAVE_ARCH_STRCSPN /** * strcspn - Calculate the length of the initial substring of @s which does not contain letters in @reject * @s: The string to be searched * @reject: The string to avoid */ size_t strcspn(const char *s, const char *reject) { const char *p; const char *r; size_t count = 0; for (p = s; *p != '\0'; ++p) { for (r = reject; *r != '\0'; ++r) { if (*p == *r) return count; } ++count; } return count; } EXPORT_SYMBOL(strcspn); #endif