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// stdio.h
struct FILE;
extern static stdin *FILE,
stdout *FILE,
stderr *FILE;
extern fn printf(fmt *const u8, ...) int;
extern fn fprintf(fp *FILE, fmt *const u8, ...) int;
extern fn sprintf(*u8, fmt *const u8, ...) int;
extern fn snprintf(*u8, usize, fmt *const u8, ...) int;
extern fn fopen(path *const u8, mode *const u8) *FILE;
extern fn fclose(*FILE) int;
extern fn fgetc(*FILE) int;
extern fn fputc(int, *FILE) int;
def EOF = -1;
// stdlib.h
extern fn abort() void;
extern fn exit(c int) void;
extern fn perror(s *const u8) void;
extern fn malloc(n usize) *void;
extern fn calloc(n usize, m usize) *void;
extern fn realloc(p *void, n usize) *void;
extern fn free(p *void) void;
// string.h
extern fn strlen(s *const u8) usize;
extern fn strcmp(a *const u8, b *const u8) int;
extern fn memcpy(*void, *const void, usize) *void;
extern fn strcpy(*u8, *const u8) *u8;
//ctype.h
extern fn tolower(int) int;
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