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41d7c77d6a
the historical mess of having different definitions for C and C++ comes from the historical C definition as (void *)0 and the fact that (void *)0 can't be used in C++ because it does not convert to other pointer types implicitly. however, using plain 0 in C++ exposed bugs in C++ programs that call variadic functions with NULL as an argument and (wrongly; this is UB) expect it to arrive as a null pointer. on 64-bit machines, the high bits end up containing junk. glibc dodges the issue by using a GCC extension __null to define NULL; this is observably non-conforming because a conforming application could observe the definition of NULL via stringizing and see that it is neither an integer constant expression with value zero nor such an expression cast to void. switching to 0L eliminates the issue and provides compatibility with broken applications, since on all musl targets, long and pointers have the same size, representation, and argument-passing convention. we could maintain separate C and C++ definitions of NULL (i.e. just use 0L on C++ and use (void *)0 on C) but after careful analysis, it seems extremely difficult for a C program to even determine whether NULL has integer or pointer type, much less depend in subtle, unintentional ways, on whether it does. C89 seems to have no way to make the distinction. on C99, the fact that (int)(void *)0 is not an integer constant expression, along with subtle VLA/sizeof semantics, can be used to make the distinction, but many compilers are non-conforming and give the wrong result to this test anyway. on C11, _Generic can trivially make the distinction, but it seems unlikely that code targetting C11 would be so backwards in caring which definition of NULL an implementation uses. as such, the simplest path of using the same definition for NULL in both C and C++ was chosen. the #undef directive was also removed so that the compiler can catch and give a warning or error on redefinition if buggy programs have defined their own versions of NULL prior to inclusion of standard headers.
199 lines
5.0 KiB
C
199 lines
5.0 KiB
C
#ifndef _STDIO_H
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#define _STDIO_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <features.h>
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#define __NEED_FILE
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#define __NEED_va_list
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#define __NEED_size_t
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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#define __NEED_ssize_t
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#define __NEED_off_t
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#endif
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#include <bits/alltypes.h>
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#define NULL 0L
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#undef EOF
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#define EOF (-1)
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#undef SEEK_SET
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#undef SEEK_CUR
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#undef SEEK_END
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#define SEEK_SET 0
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#define SEEK_CUR 1
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#define SEEK_END 2
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#define _IOFBF 0
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#define _IOLBF 1
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#define _IONBF 2
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#define BUFSIZ 1024
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#define FILENAME_MAX 4095
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#define FOPEN_MAX 1000
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#define TMP_MAX 10000
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#define L_tmpnam 20
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typedef union {
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char __opaque[16];
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double __align;
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} fpos_t;
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extern FILE *const stdin;
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extern FILE *const stdout;
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extern FILE *const stderr;
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#define stdin (stdin)
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#define stdout (stdout)
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#define stderr (stderr)
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FILE *fopen(const char *__restrict, const char *__restrict);
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FILE *freopen(const char *__restrict, const char *__restrict, FILE *__restrict);
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int fclose(FILE *);
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int remove(const char *);
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int rename(const char *, const char *);
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int feof(FILE *);
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int ferror(FILE *);
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int fflush(FILE *);
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void clearerr(FILE *);
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int fseek(FILE *, long, int);
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long ftell(FILE *);
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void rewind(FILE *);
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int fgetpos(FILE *__restrict, fpos_t *__restrict);
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int fsetpos(FILE *, const fpos_t *);
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size_t fread(void *__restrict, size_t, size_t, FILE *__restrict);
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size_t fwrite(const void *__restrict, size_t, size_t, FILE *__restrict);
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int fgetc(FILE *);
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int getc(FILE *);
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int getchar(void);
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int ungetc(int, FILE *);
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int fputc(int, FILE *);
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int putc(int, FILE *);
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int putchar(int);
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char *fgets(char *__restrict, int, FILE *__restrict);
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#if __STDC_VERSION__ < 201112L
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char *gets(char *);
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#endif
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int fputs(const char *__restrict, FILE *__restrict);
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int puts(const char *);
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int printf(const char *__restrict, ...);
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int fprintf(FILE *__restrict, const char *__restrict, ...);
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int sprintf(char *__restrict, const char *__restrict, ...);
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int snprintf(char *__restrict, size_t, const char *__restrict, ...);
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int vprintf(const char *__restrict, va_list);
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int vfprintf(FILE *__restrict, const char *__restrict, va_list);
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int vsprintf(char *__restrict, const char *__restrict, va_list);
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int vsnprintf(char *__restrict, size_t, const char *__restrict, va_list);
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int scanf(const char *__restrict, ...);
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int fscanf(FILE *__restrict, const char *__restrict, ...);
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int sscanf(const char *__restrict, const char *__restrict, ...);
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int vscanf(const char *__restrict, va_list);
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int vfscanf(FILE *__restrict, const char *__restrict, va_list);
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int vsscanf(const char *__restrict, const char *__restrict, va_list);
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void perror(const char *);
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int setvbuf(FILE *__restrict, char *__restrict, int, size_t);
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void setbuf(FILE *__restrict, char *__restrict);
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char *tmpnam(char *);
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FILE *tmpfile(void);
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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FILE *fmemopen(void *__restrict, size_t, const char *__restrict);
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FILE *open_memstream(char **, size_t *);
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FILE *fdopen(int, const char *);
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FILE *popen(const char *, const char *);
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int pclose(FILE *);
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int fileno(FILE *);
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int fseeko(FILE *, off_t, int);
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off_t ftello(FILE *);
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int dprintf(int, const char *__restrict, ...);
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int vdprintf(int, const char *__restrict, va_list);
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void flockfile(FILE *);
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int ftrylockfile(FILE *);
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void funlockfile(FILE *);
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int getc_unlocked(FILE *);
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int getchar_unlocked(void);
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int putc_unlocked(int, FILE *);
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int putchar_unlocked(int);
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ssize_t getdelim(char **__restrict, size_t *__restrict, int, FILE *__restrict);
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ssize_t getline(char **__restrict, size_t *__restrict, FILE *__restrict);
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int renameat(int, const char *, int, const char *);
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char *ctermid(char *);
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#define L_ctermid 20
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#endif
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#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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#define P_tmpdir "/tmp"
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char *tempnam(const char *, const char *);
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#endif
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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#define L_cuserid 20
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char *cuserid(char *);
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void setlinebuf(FILE *);
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void setbuffer(FILE *, char *, size_t);
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int fgetc_unlocked(FILE *);
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int fputc_unlocked(int, FILE *);
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int fflush_unlocked(FILE *);
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size_t fread_unlocked(void *, size_t, size_t, FILE *);
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size_t fwrite_unlocked(const void *, size_t, size_t, FILE *);
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void clearerr_unlocked(FILE *);
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int feof_unlocked(FILE *);
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int ferror_unlocked(FILE *);
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int fileno_unlocked(FILE *);
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int getw(FILE *);
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int putw(int, FILE *);
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char *fgetln(FILE *, size_t *);
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int asprintf(char **, const char *, ...);
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int vasprintf(char **, const char *, va_list);
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#endif
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#ifdef _GNU_SOURCE
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char *fgets_unlocked(char *, int, FILE *);
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int fputs_unlocked(const char *, FILE *);
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#endif
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#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
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#define tmpfile64 tmpfile
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#define fopen64 fopen
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#define freopen64 freopen
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#define fseeko64 fseeko
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#define ftello64 ftello
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#define fgetpos64 fgetpos
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#define fsetpos64 fsetpos
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#define fpos64_t fpos_t
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#define off64_t off_t
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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