A common string library function implemented in Linux kernel

Only a subset of the commonly used Strcpy,strcmp,strcat,strchr,strstr,strpbrk... char *strcpy (char *dest, const char *src) {char *tmp = Dest;while ((*dest++ = *src++)! = ' + ')/* nothing */;return tmp;} Char *strncpy (char *dest, const char *SRC, size_t count) {char *tmp = dest;while (count) {if ((*tmp = *src)! = 0) src++;tmp+ +;count--;} return dest;} Char *strcat (char *dest, const char *src) {char *tmp = dest;while (*dest) dest++;while ((*dest++ = *src++)! = ' + '); return t MP;} Char *strncat (char *dest, const char *SRC, size_t count) {char *tmp = dest;if (count) {while (*dest) Dest++;while ((*dest++ = *src++)! = 0) {if (--count = = 0) {*dest = ' + '; break;}}} return TMP;} int strcmp (const char *CS, const char *ct) {signed char __res;while (1) {if ((__res = *cs-*ct++)! = 0 | |!*cs++) break;} return __res;} int strncmp (const char *CS, const char *CT, size_t count) {signed char __res = 0;while (count) {if (__res = *cs-*ct++)! = 0 | | !*cs++) break;count--;} return __res;} Char *strchr (const char *s, int c) {for (; *s! = (char) c; ++s) if (*s = = ') ' Return Null;return (char *) s;}       Char *strrchr (const char *s, int c) {const char *p = s + strlen (s);       do {if (*p = = (char) c) return (char *) p;       } while (--p >= s); return NULL;}  Char *strnchr (const char *s, size_t count, int c) {for (; count--&& *s! = '; ++s ') if (*s = = (char) c) return (char *) S;return NULL;} size_t strlen (const char *s) {const char *sc;for (sc = s; *sc! = '); ++sc)/* Nothing */;return sc-s;} Char *strpbrk (const char *CS, const char *ct) {const char *SC1, *sc2;for (SC1 = cs; *sc1! = '); ++sc1) {for (SC2 = ct; *s C2! = ' + '; ++SC2) {if (*sc1 = = *SC2) return (char *) SC1;}} return NULL;} void *memcpy (void *dest, const void *SRC, size_t count) {char *tmp = dest;const char *s = src;while (count--) *tmp++ = *s++; return dest;} int memcmp (const void *cs, const void *CT, size_t count) {const unsigned char *su1, *su2;int res = 0;for (su1 = cs, su2 = C T 0 < Count; ++SU1, ++SU2, count--) if (res = *SU1-*SU2) ! = 0) Break;return Res;} Char *strstr (const char *S1, const char *s2) {int L1, l2;l2 = strlen (s2), if (!L2) return (char *) S1;L1 = strlen (S1), while (l 1 >= L2) {l1--;if (!memcmp (S1, S2, L2)) return (char *) s1;s1++;} return NULL;}