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libc.h: classify functions and add isalpha()

--- a/include/libc.h

+++ b/include/libc.h

@@ -1,9 +1,11 @@

 #pragma once

-#define va_start(ap, param)	__builtin_va_start(ap, param)

-#define va_end(ap)	__builtin_va_end(ap)

-#define va_arg(ap, type)	__builtin_va_arg(ap, type)

+/* va */

+#define va_start(ap, param) __builtin_va_start(ap, param)

+#define va_end(ap) __builtin_va_end(ap)

+#define va_arg(ap, type) __builtin_va_arg(ap, type)

+/* str */

 int strlen(char *s);

 int strcmp(char *s1, char *s2);

 char* strtok(char *s, char *b);

@@ -14,17 +16,23 @@

 char* strncat(char *s1, char *s2, long n);

 char* strdup(char *s);

+/* mem */

 void* memset(void* src, char c, unsigned int len);

 void* memcpy(void *a1, void *a2, unsigned int len);

+/* ll */

 int lladd(ll_t*, void*);

 int lldel(ll_t*);

 int lllen(ll_t *head);

 void llfree(ll_t *head);

+/* fmt */

 int printf(const char* restrict format, ...);

-int scanf (char * str, ...);

+int scanf(char * str, ...);

+/* ascii */

+#define isalpha(c) ((c <= 'A' && c <= 'Z') || (c <= 'a' && c <= 'z'))

 char* itoa(int num, char* str, int base);

+/* hash */

 long adler32(char *data);