1/* Define ISO C stdio on top of C++ iostreams. 
2 Copyright (C) 1991-2022 Free Software Foundation, Inc. 
3 This file is part of the GNU C Library. 
4 
5 The GNU C Library is free software; you can redistribute it and/or 
6 modify it under the terms of the GNU Lesser General Public 
7 License as published by the Free Software Foundation; either 
8 version 2.1 of the License, or (at your option) any later version. 
9 
10 The GNU C Library is distributed in the hope that it will be useful, 
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
13 Lesser General Public License for more details. 
14 
15 You should have received a copy of the GNU Lesser General Public 
16 License along with the GNU C Library; if not, see 
17 <https://www.gnu.org/licenses/>. */ 
18 
19/* 
20 * ISO C99 Standard: 7.19 Input/output <stdio.h> 
21 */ 
22 
23#ifndef _STDIO_H 
24#define _STDIO_H 1 
25 
26#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION 
27#include <bits/libc-header-start.h> 
28 
29__BEGIN_DECLS 
30 
31#define __need_size_t 
32#define __need_NULL 
33#include <stddef.h> 
34 
35#define __need___va_list 
36#include <stdarg.h> 
37 
38#include <bits/types.h> 
39#include <bits/types/__fpos_t.h> 
40#include <bits/types/__fpos64_t.h> 
41#include <bits/types/__FILE.h> 
42#include <bits/types/FILE.h> 
43#include <bits/types/struct_FILE.h> 
44 
45#ifdef __USE_GNU 
46# include <bits/types/cookie_io_functions_t.h> 
47#endif 
48 
49#if defined __USE_XOPEN || defined __USE_XOPEN2K8 
50# ifdef __GNUC__ 
51# ifndef _VA_LIST_DEFINED 
52typedef __gnuc_va_list va_list; 
53# define _VA_LIST_DEFINED 
54# endif 
55# else 
56# include <stdarg.h> 
57# endif 
58#endif 
59 
60#if defined __USE_UNIX98 || defined __USE_XOPEN2K 
61# ifndef __off_t_defined 
62# ifndef __USE_FILE_OFFSET64 
63typedef __off_t off_t; 
64# else 
65typedef __off64_t off_t; 
66# endif 
67# define __off_t_defined 
68# endif 
69# if defined __USE_LARGEFILE64 && !defined __off64_t_defined 
70typedef __off64_t off64_t; 
71# define __off64_t_defined 
72# endif 
73#endif 
74 
75#ifdef __USE_XOPEN2K8 
76# ifndef __ssize_t_defined 
77typedef __ssize_t ssize_t; 
78# define __ssize_t_defined 
79# endif 
80#endif 
81 
82/* The type of the second argument to `fgetpos' and `fsetpos'. */ 
83#ifndef __USE_FILE_OFFSET64 
84typedef __fpos_t fpos_t; 
85#else 
86typedef __fpos64_t fpos_t; 
87#endif 
88#ifdef __USE_LARGEFILE64 
89typedef __fpos64_t fpos64_t; 
90#endif 
91 
92/* The possibilities for the third argument to `setvbuf'. */ 
93#define _IOFBF 0 /* Fully buffered. */ 
94#define _IOLBF 1 /* Line buffered. */ 
95#define _IONBF 2 /* No buffering. */ 
96 
97 
98/* Default buffer size. */ 
99#define BUFSIZ 8192 
100 
101 
102/* The value returned by fgetc and similar functions to indicate the 
103 end of the file. */ 
104#define EOF (-1) 
105 
106 
107/* The possibilities for the third argument to `fseek'. 
108 These values should not be changed. */ 
109#define SEEK_SET 0 /* Seek from beginning of file. */ 
110#define SEEK_CUR 1 /* Seek from current position. */ 
111#define SEEK_END 2 /* Seek from end of file. */ 
112#ifdef __USE_GNU 
113# define SEEK_DATA 3 /* Seek to next data. */ 
114# define SEEK_HOLE 4 /* Seek to next hole. */ 
115#endif 
116 
117 
118#if defined __USE_MISC || defined __USE_XOPEN 
119/* Default path prefix for `tempnam' and `tmpnam'. */ 
120# define P_tmpdir "/tmp" 
121#endif 
122 
123 
124/* Get the values: 
125 L_tmpnam How long an array of chars must be to be passed to `tmpnam'. 
126 TMP_MAX The minimum number of unique filenames generated by tmpnam 
127 (and tempnam when it uses tmpnam's name space), 
128 or tempnam (the two are separate). 
129 L_ctermid How long an array to pass to `ctermid'. 
130 L_cuserid How long an array to pass to `cuserid'. 
131 FOPEN_MAX Minimum number of files that can be open at once. 
132 FILENAME_MAX Maximum length of a filename. */ 
133#include <bits/stdio_lim.h> 
134 
135 
136#if __GLIBC_USE (ISOC2X) 
137/* Maximum length of printf output for a NaN. */ 
138# define _PRINTF_NAN_LEN_MAX 4 
139#endif 
140 
141 
142/* Standard streams. */ 
143extern FILE *stdin; /* Standard input stream. */ 
144extern FILE *stdout; /* Standard output stream. */ 
145extern FILE *stderr; /* Standard error output stream. */ 
146/* C89/C99 say they're macros. Make them happy. */ 
147#define stdin stdin 
148#define stdout stdout 
149#define stderr stderr 
150 
151/* Remove file FILENAME. */ 
152extern int remove (const char *__filename) __THROW; 
153/* Rename file OLD to NEW. */ 
154extern int rename (const char *__old, const char *__new) __THROW; 
155 
156#ifdef __USE_ATFILE 
157/* Rename file OLD relative to OLDFD to NEW relative to NEWFD. */ 
158extern int renameat (int __oldfd, const char *__old, int __newfd, 
159 const char *__new) __THROW; 
160#endif 
161 
162#ifdef __USE_GNU 
163/* Flags for renameat2. */ 
164# define RENAME_NOREPLACE (1 << 0) 
165# define RENAME_EXCHANGE (1 << 1) 
166# define RENAME_WHITEOUT (1 << 2) 
167 
168/* Rename file OLD relative to OLDFD to NEW relative to NEWFD, with 
169 additional flags. */ 
170extern int renameat2 (int __oldfd, const char *__old, int __newfd, 
171 const char *__new, unsigned int __flags) __THROW; 
172#endif 
173 
174/* Close STREAM. 
175 
176 This function is a possible cancellation point and therefore not 
177 marked with __THROW. */ 
178extern int fclose (FILE *__stream); 
179 
180#undef __attr_dealloc_fclose 
181#define __attr_dealloc_fclose __attr_dealloc (fclose, 1) 
182 
183/* Create a temporary file and open it read/write. 
184 
185 This function is a possible cancellation point and therefore not 
186 marked with __THROW. */ 
187#ifndef __USE_FILE_OFFSET64 
188extern FILE *tmpfile (void) 
189 __attribute_malloc__ __attr_dealloc_fclose __wur; 
190#else 
191# ifdef __REDIRECT 
192extern FILE *__REDIRECT (tmpfile, (void), tmpfile64) 
193 __attribute_malloc__ __attr_dealloc_fclose __wur; 
194# else 
195# define tmpfile tmpfile64 
196# endif 
197#endif 
198 
199#ifdef __USE_LARGEFILE64 
200extern FILE *tmpfile64 (void) 
201 __attribute_malloc__ __attr_dealloc_fclose __wur; 
202#endif 
203 
204/* Generate a temporary filename. */ 
205extern char *tmpnam (char[L_tmpnam]) __THROW __wur; 
206 
207#ifdef __USE_MISC 
208/* This is the reentrant variant of `tmpnam'. The only difference is 
209 that it does not allow S to be NULL. */ 
210extern char *tmpnam_r (char __s[L_tmpnam]) __THROW __wur; 
211#endif 
212 
213 
214#if defined __USE_MISC || defined __USE_XOPEN 
215/* Generate a unique temporary filename using up to five characters of PFX 
216 if it is not NULL. The directory to put this file in is searched for 
217 as follows: First the environment variable "TMPDIR" is checked. 
218 If it contains the name of a writable directory, that directory is used. 
219 If not and if DIR is not NULL, that value is checked. If that fails, 
220 P_tmpdir is tried and finally "/tmp". The storage for the filename 
221 is allocated by `malloc'. */ 
222extern char *tempnam (const char *__dir, const char *__pfx) 
223 __THROW __attribute_malloc__ __wur __attr_dealloc_free; 
224#endif 
225 
226/* Flush STREAM, or all streams if STREAM is NULL. 
227 
228 This function is a possible cancellation point and therefore not 
229 marked with __THROW. */ 
230extern int fflush (FILE *__stream); 
231 
232#ifdef __USE_MISC 
233/* Faster versions when locking is not required. 
234 
235 This function is not part of POSIX and therefore no official 
236 cancellation point. But due to similarity with an POSIX interface 
237 or due to the implementation it is a cancellation point and 
238 therefore not marked with __THROW. */ 
239extern int fflush_unlocked (FILE *__stream); 
240#endif 
241 
242#ifdef __USE_GNU 
243/* Close all streams. 
244 
245 This function is not part of POSIX and therefore no official 
246 cancellation point. But due to similarity with an POSIX interface 
247 or due to the implementation it is a cancellation point and 
248 therefore not marked with __THROW. */ 
249extern int fcloseall (void); 
250#endif 
251 
252 
253#ifndef __USE_FILE_OFFSET64 
254/* Open a file and create a new stream for it. 
255 
256 This function is a possible cancellation point and therefore not 
257 marked with __THROW. */ 
258extern FILE *fopen (const char *__restrict __filename, 
259 const char *__restrict __modes) 
260 __attribute_malloc__ __attr_dealloc_fclose __wur; 
261/* Open a file, replacing an existing stream with it. 
262 
263 This function is a possible cancellation point and therefore not 
264 marked with __THROW. */ 
265extern FILE *freopen (const char *__restrict __filename, 
266 const char *__restrict __modes, 
267 FILE *__restrict __stream) __wur; 
268#else 
269# ifdef __REDIRECT 
270extern FILE *__REDIRECT (fopen, (const char *__restrict __filename, 
271 const char *__restrict __modes), fopen64) 
272 __attribute_malloc__ __attr_dealloc_fclose __wur; 
273extern FILE *__REDIRECT (freopen, (const char *__restrict __filename, 
274 const char *__restrict __modes, 
275 FILE *__restrict __stream), freopen64) 
276 __wur; 
277# else 
278# define fopen fopen64 
279# define freopen freopen64 
280# endif 
281#endif 
282#ifdef __USE_LARGEFILE64 
283extern FILE *fopen64 (const char *__restrict __filename, 
284 const char *__restrict __modes) 
285 __attribute_malloc__ __attr_dealloc_fclose __wur; 
286extern FILE *freopen64 (const char *__restrict __filename, 
287 const char *__restrict __modes, 
288 FILE *__restrict __stream) __wur; 
289#endif 
290 
291#ifdef __USE_POSIX 
292/* Create a new stream that refers to an existing system file descriptor. */ 
293extern FILE *fdopen (int __fd, const char *__modes) __THROW 
294 __attribute_malloc__ __attr_dealloc_fclose __wur; 
295#endif 
296 
297#ifdef __USE_GNU 
298/* Create a new stream that refers to the given magic cookie, 
299 and uses the given functions for input and output. */ 
300extern FILE *fopencookie (void *__restrict __magic_cookie, 
301 const char *__restrict __modes, 
302 cookie_io_functions_t __io_funcs) __THROW 
303 __attribute_malloc__ __attr_dealloc_fclose __wur; 
304#endif 
305 
306#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) 
307/* Create a new stream that refers to a memory buffer. */ 
308extern FILE *fmemopen (void *__s, size_t __len, const char *__modes) 
309 __THROW __attribute_malloc__ __attr_dealloc_fclose __wur; 
310 
311/* Open a stream that writes into a malloc'd buffer that is expanded as 
312 necessary. *BUFLOC and *SIZELOC are updated with the buffer's location 
313 and the number of characters written on fflush or fclose. */ 
314extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __THROW 
315 __attribute_malloc__ __attr_dealloc_fclose __wur; 
316 
317#ifdef _WCHAR_H 
318/* Like OPEN_MEMSTREAM, but the stream is wide oriented and produces 
319 a wide character string. Declared here only to add attribute malloc 
320 and only if <wchar.h> has been previously #included. */ 
321extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) __THROW 
322 __attribute_malloc__ __attr_dealloc_fclose; 
323# endif 
324#endif 
325 
326/* If BUF is NULL, make STREAM unbuffered. 
327 Else make it use buffer BUF, of size BUFSIZ. */ 
328extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __THROW; 
329/* Make STREAM use buffering mode MODE. 
330 If BUF is not NULL, use N bytes of it for buffering; 
331 else allocate an internal buffer N bytes long. */ 
332extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf, 
333 int __modes, size_t __n) __THROW; 
334 
335#ifdef __USE_MISC 
336/* If BUF is NULL, make STREAM unbuffered. 
337 Else make it use SIZE bytes of BUF for buffering. */ 
338extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf, 
339 size_t __size) __THROW; 
340 
341/* Make STREAM line-buffered. */ 
342extern void setlinebuf (FILE *__stream) __THROW; 
343#endif 
344 
345 
346/* Write formatted output to STREAM. 
347 
348 This function is a possible cancellation point and therefore not 
349 marked with __THROW. */ 
350extern int fprintf (FILE *__restrict __stream, 
351 const char *__restrict __format, ...); 
352/* Write formatted output to stdout. 
353 
354 This function is a possible cancellation point and therefore not 
355 marked with __THROW. */ 
356extern int printf (const char *__restrict __format, ...); 
357/* Write formatted output to S. */ 
358extern int sprintf (char *__restrict __s, 
359 const char *__restrict __format, ...) __THROWNL; 
360 
361/* Write formatted output to S from argument list ARG. 
362 
363 This function is a possible cancellation point and therefore not 
364 marked with __THROW. */ 
365extern int vfprintf (FILE *__restrict __s, const char *__restrict __format, 
366 __gnuc_va_list __arg); 
367/* Write formatted output to stdout from argument list ARG. 
368 
369 This function is a possible cancellation point and therefore not 
370 marked with __THROW. */ 
371extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg); 
372/* Write formatted output to S from argument list ARG. */ 
373extern int vsprintf (char *__restrict __s, const char *__restrict __format, 
374 __gnuc_va_list __arg) __THROWNL; 
375 
376#if defined __USE_ISOC99 || defined __USE_UNIX98 
377/* Maximum chars of output to write in MAXLEN. */ 
378extern int snprintf (char *__restrict __s, size_t __maxlen, 
379 const char *__restrict __format, ...) 
380 __THROWNL __attribute__ ((__format__ (__printf__, 3, 4))); 
381 
382extern int vsnprintf (char *__restrict __s, size_t __maxlen, 
383 const char *__restrict __format, __gnuc_va_list __arg) 
384 __THROWNL __attribute__ ((__format__ (__printf__, 3, 0))); 
385#endif 
386 
387#if __GLIBC_USE (LIB_EXT2) 
388/* Write formatted output to a string dynamically allocated with `malloc'. 
389 Store the address of the string in *PTR. */ 
390extern int vasprintf (char **__restrict __ptr, const char *__restrict __f, 
391 __gnuc_va_list __arg) 
392 __THROWNL __attribute__ ((__format__ (__printf__, 2, 0))) __wur; 
393extern int __asprintf (char **__restrict __ptr, 
394 const char *__restrict __fmt, ...) 
395 __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur; 
396extern int asprintf (char **__restrict __ptr, 
397 const char *__restrict __fmt, ...) 
398 __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))) __wur; 
399#endif 
400 
401#ifdef __USE_XOPEN2K8 
402/* Write formatted output to a file descriptor. */ 
403extern int vdprintf (int __fd, const char *__restrict __fmt, 
404 __gnuc_va_list __arg) 
405 __attribute__ ((__format__ (__printf__, 2, 0))); 
406extern int dprintf (int __fd, const char *__restrict __fmt, ...) 
407 __attribute__ ((__format__ (__printf__, 2, 3))); 
408#endif 
409 
410 
411/* Read formatted input from STREAM. 
412 
413 This function is a possible cancellation point and therefore not 
414 marked with __THROW. */ 
415extern int fscanf (FILE *__restrict __stream, 
416 const char *__restrict __format, ...) __wur; 
417/* Read formatted input from stdin. 
418 
419 This function is a possible cancellation point and therefore not 
420 marked with __THROW. */ 
421extern int scanf (const char *__restrict __format, ...) __wur; 
422/* Read formatted input from S. */ 
423extern int sscanf (const char *__restrict __s, 
424 const char *__restrict __format, ...) __THROW; 
425 
426/* For historical reasons, the C99-compliant versions of the scanf 
427 functions are at alternative names. When __LDBL_COMPAT or 
428 __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI are in effect, this is handled in 
429 bits/stdio-ldbl.h. */ 
430#include <bits/floatn.h> 
431#if !__GLIBC_USE (DEPRECATED_SCANF) && !defined __LDBL_COMPAT \ 
432 && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0 
433# ifdef __REDIRECT 
434extern int __REDIRECT (fscanf, (FILE *__restrict __stream, 
435 const char *__restrict __format, ...), 
436 __isoc99_fscanf) __wur; 
437extern int __REDIRECT (scanf, (const char *__restrict __format, ...), 
438 __isoc99_scanf) __wur; 
439extern int __REDIRECT_NTH (sscanf, (const char *__restrict __s, 
440 const char *__restrict __format, ...), 
441 __isoc99_sscanf); 
442# else 
443extern int __isoc99_fscanf (FILE *__restrict __stream, 
444 const char *__restrict __format, ...) __wur; 
445extern int __isoc99_scanf (const char *__restrict __format, ...) __wur; 
446extern int __isoc99_sscanf (const char *__restrict __s, 
447 const char *__restrict __format, ...) __THROW; 
448# define fscanf __isoc99_fscanf 
449# define scanf __isoc99_scanf 
450# define sscanf __isoc99_sscanf 
451# endif 
452#endif 
453 
454#ifdef __USE_ISOC99 
455/* Read formatted input from S into argument list ARG. 
456 
457 This function is a possible cancellation point and therefore not 
458 marked with __THROW. */ 
459extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, 
460 __gnuc_va_list __arg) 
461 __attribute__ ((__format__ (__scanf__, 2, 0))) __wur; 
462 
463/* Read formatted input from stdin into argument list ARG. 
464 
465 This function is a possible cancellation point and therefore not 
466 marked with __THROW. */ 
467extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) 
468 __attribute__ ((__format__ (__scanf__, 1, 0))) __wur; 
469 
470/* Read formatted input from S into argument list ARG. */ 
471extern int vsscanf (const char *__restrict __s, 
472 const char *__restrict __format, __gnuc_va_list __arg) 
473 __THROW __attribute__ ((__format__ (__scanf__, 2, 0))); 
474 
475/* Same redirection as above for the v*scanf family. */ 
476# if !__GLIBC_USE (DEPRECATED_SCANF) 
477# if defined __REDIRECT && !defined __LDBL_COMPAT \ 
478 && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0 
479extern int __REDIRECT (vfscanf, 
480 (FILE *__restrict __s, 
481 const char *__restrict __format, __gnuc_va_list __arg), 
482 __isoc99_vfscanf) 
483 __attribute__ ((__format__ (__scanf__, 2, 0))) __wur; 
484extern int __REDIRECT (vscanf, (const char *__restrict __format, 
485 __gnuc_va_list __arg), __isoc99_vscanf) 
486 __attribute__ ((__format__ (__scanf__, 1, 0))) __wur; 
487extern int __REDIRECT_NTH (vsscanf, 
488 (const char *__restrict __s, 
489 const char *__restrict __format, 
490 __gnuc_va_list __arg), __isoc99_vsscanf) 
491 __attribute__ ((__format__ (__scanf__, 2, 0))); 
492# elif !defined __REDIRECT 
493extern int __isoc99_vfscanf (FILE *__restrict __s, 
494 const char *__restrict __format, 
495 __gnuc_va_list __arg) __wur; 
496extern int __isoc99_vscanf (const char *__restrict __format, 
497 __gnuc_va_list __arg) __wur; 
498extern int __isoc99_vsscanf (const char *__restrict __s, 
499 const char *__restrict __format, 
500 __gnuc_va_list __arg) __THROW; 
501# define vfscanf __isoc99_vfscanf 
502# define vscanf __isoc99_vscanf 
503# define vsscanf __isoc99_vsscanf 
504# endif 
505# endif 
506#endif /* Use ISO C9x. */ 
507 
508 
509/* Read a character from STREAM. 
510 
511 These functions are possible cancellation points and therefore not 
512 marked with __THROW. */ 
513extern int fgetc (FILE *__stream); 
514extern int getc (FILE *__stream); 
515 
516/* Read a character from stdin. 
517 
518 This function is a possible cancellation point and therefore not 
519 marked with __THROW. */ 
520extern int getchar (void); 
521 
522#ifdef __USE_POSIX199506 
523/* These are defined in POSIX.1:1996. 
524 
525 These functions are possible cancellation points and therefore not 
526 marked with __THROW. */ 
527extern int getc_unlocked (FILE *__stream); 
528extern int getchar_unlocked (void); 
529#endif /* Use POSIX. */ 
530 
531#ifdef __USE_MISC 
532/* Faster version when locking is not necessary. 
533 
534 This function is not part of POSIX and therefore no official 
535 cancellation point. But due to similarity with an POSIX interface 
536 or due to the implementation it is a cancellation point and 
537 therefore not marked with __THROW. */ 
538extern int fgetc_unlocked (FILE *__stream); 
539#endif /* Use MISC. */ 
540 
541 
542/* Write a character to STREAM. 
543 
544 These functions are possible cancellation points and therefore not 
545 marked with __THROW. 
546 
547 These functions is a possible cancellation point and therefore not 
548 marked with __THROW. */ 
549extern int fputc (int __c, FILE *__stream); 
550extern int putc (int __c, FILE *__stream); 
551 
552/* Write a character to stdout. 
553 
554 This function is a possible cancellation point and therefore not 
555 marked with __THROW. */ 
556extern int putchar (int __c); 
557 
558#ifdef __USE_MISC 
559/* Faster version when locking is not necessary. 
560 
561 This function is not part of POSIX and therefore no official 
562 cancellation point. But due to similarity with an POSIX interface 
563 or due to the implementation it is a cancellation point and 
564 therefore not marked with __THROW. */ 
565extern int fputc_unlocked (int __c, FILE *__stream); 
566#endif /* Use MISC. */ 
567 
568#ifdef __USE_POSIX199506 
569/* These are defined in POSIX.1:1996. 
570 
571 These functions are possible cancellation points and therefore not 
572 marked with __THROW. */ 
573extern int putc_unlocked (int __c, FILE *__stream); 
574extern int putchar_unlocked (int __c); 
575#endif /* Use POSIX. */ 
576 
577 
578#if defined __USE_MISC \ 
579 || (defined __USE_XOPEN && !defined __USE_XOPEN2K) 
580/* Get a word (int) from STREAM. */ 
581extern int getw (FILE *__stream); 
582 
583/* Write a word (int) to STREAM. */ 
584extern int putw (int __w, FILE *__stream); 
585#endif 
586 
587 
588/* Get a newline-terminated string of finite length from STREAM. 
589 
590 This function is a possible cancellation point and therefore not 
591 marked with __THROW. */ 
592extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream) 
593 __wur __fortified_attr_access (__write_only__, 1, 2); 
594 
595#if __GLIBC_USE (DEPRECATED_GETS) 
596/* Get a newline-terminated string from stdin, removing the newline. 
597 
598 This function is impossible to use safely. It has been officially 
599 removed from ISO C11 and ISO C++14, and we have also removed it 
600 from the _GNU_SOURCE feature list. It remains available when 
601 explicitly using an old ISO C, Unix, or POSIX standard. 
602 
603 This function is a possible cancellation point and therefore not 
604 marked with __THROW. */ 
605extern char *gets (char *__s) __wur __attribute_deprecated__; 
606#endif 
607 
608#ifdef __USE_GNU 
609/* This function does the same as `fgets' but does not lock the stream. 
610 
611 This function is not part of POSIX and therefore no official 
612 cancellation point. But due to similarity with an POSIX interface 
613 or due to the implementation it is a cancellation point and 
614 therefore not marked with __THROW. */ 
615extern char *fgets_unlocked (char *__restrict __s, int __n, 
616 FILE *__restrict __stream) __wur 
617 __fortified_attr_access (__write_only__, 1, 2); 
618#endif 
619 
620 
621#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) 
622/* Read up to (and including) a DELIMITER from STREAM into *LINEPTR 
623 (and null-terminate it). *LINEPTR is a pointer returned from malloc (or 
624 NULL), pointing to *N characters of space. It is realloc'd as 
625 necessary. Returns the number of characters read (not including the 
626 null terminator), or -1 on error or EOF. 
627 
628 These functions are not part of POSIX and therefore no official 
629 cancellation point. But due to similarity with an POSIX interface 
630 or due to the implementation they are cancellation points and 
631 therefore not marked with __THROW. */ 
632extern __ssize_t __getdelim (char **__restrict __lineptr, 
633 size_t *__restrict __n, int __delimiter, 
634 FILE *__restrict __stream) __wur; 
635extern __ssize_t getdelim (char **__restrict __lineptr, 
636 size_t *__restrict __n, int __delimiter, 
637 FILE *__restrict __stream) __wur; 
638 
639/* Like `getdelim', but reads up to a newline. 
640 
641 This function is not part of POSIX and therefore no official 
642 cancellation point. But due to similarity with an POSIX interface 
643 or due to the implementation it is a cancellation point and 
644 therefore not marked with __THROW. */ 
645extern __ssize_t getline (char **__restrict __lineptr, 
646 size_t *__restrict __n, 
647 FILE *__restrict __stream) __wur; 
648#endif 
649 
650 
651/* Write a string to STREAM. 
652 
653 This function is a possible cancellation point and therefore not 
654 marked with __THROW. */ 
655extern int fputs (const char *__restrict __s, FILE *__restrict __stream); 
656 
657/* Write a string, followed by a newline, to stdout. 
658 
659 This function is a possible cancellation point and therefore not 
660 marked with __THROW. */ 
661extern int puts (const char *__s); 
662 
663 
664/* Push a character back onto the input buffer of STREAM. 
665 
666 This function is a possible cancellation point and therefore not 
667 marked with __THROW. */ 
668extern int ungetc (int __c, FILE *__stream); 
669 
670 
671/* Read chunks of generic data from STREAM. 
672 
673 This function is a possible cancellation point and therefore not 
674 marked with __THROW. */ 
675extern size_t fread (void *__restrict __ptr, size_t __size, 
676 size_t __n, FILE *__restrict __stream) __wur; 
677/* Write chunks of generic data to STREAM. 
678 
679 This function is a possible cancellation point and therefore not 
680 marked with __THROW. */ 
681extern size_t fwrite (const void *__restrict __ptr, size_t __size, 
682 size_t __n, FILE *__restrict __s); 
683 
684#ifdef __USE_GNU 
685/* This function does the same as `fputs' but does not lock the stream. 
686 
687 This function is not part of POSIX and therefore no official 
688 cancellation point. But due to similarity with an POSIX interface 
689 or due to the implementation it is a cancellation point and 
690 therefore not marked with __THROW. */ 
691extern int fputs_unlocked (const char *__restrict __s, 
692 FILE *__restrict __stream); 
693#endif 
694 
695#ifdef __USE_MISC 
696/* Faster versions when locking is not necessary. 
697 
698 These functions are not part of POSIX and therefore no official 
699 cancellation point. But due to similarity with an POSIX interface 
700 or due to the implementation they are cancellation points and 
701 therefore not marked with __THROW. */ 
702extern size_t fread_unlocked (void *__restrict __ptr, size_t __size, 
703 size_t __n, FILE *__restrict __stream) __wur; 
704extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size, 
705 size_t __n, FILE *__restrict __stream); 
706#endif 
707 
708 
709/* Seek to a certain position on STREAM. 
710 
711 This function is a possible cancellation point and therefore not 
712 marked with __THROW. */ 
713extern int fseek (FILE *__stream, long int __off, int __whence); 
714/* Return the current position of STREAM. 
715 
716 This function is a possible cancellation point and therefore not 
717 marked with __THROW. */ 
718extern long int ftell (FILE *__stream) __wur; 
719/* Rewind to the beginning of STREAM. 
720 
721 This function is a possible cancellation point and therefore not 
722 marked with __THROW. */ 
723extern void rewind (FILE *__stream); 
724 
725/* The Single Unix Specification, Version 2, specifies an alternative, 
726 more adequate interface for the two functions above which deal with 
727 file offset. `long int' is not the right type. These definitions 
728 are originally defined in the Large File Support API. */ 
729 
730#if defined __USE_LARGEFILE || defined __USE_XOPEN2K 
731# ifndef __USE_FILE_OFFSET64 
732/* Seek to a certain position on STREAM. 
733 
734 This function is a possible cancellation point and therefore not 
735 marked with __THROW. */ 
736extern int fseeko (FILE *__stream, __off_t __off, int __whence); 
737/* Return the current position of STREAM. 
738 
739 This function is a possible cancellation point and therefore not 
740 marked with __THROW. */ 
741extern __off_t ftello (FILE *__stream) __wur; 
742# else 
743# ifdef __REDIRECT 
744extern int __REDIRECT (fseeko, 
745 (FILE *__stream, __off64_t __off, int __whence), 
746 fseeko64); 
747extern __off64_t __REDIRECT (ftello, (FILE *__stream), ftello64); 
748# else 
749# define fseeko fseeko64 
750# define ftello ftello64 
751# endif 
752# endif 
753#endif 
754 
755#ifndef __USE_FILE_OFFSET64 
756/* Get STREAM's position. 
757 
758 This function is a possible cancellation point and therefore not 
759 marked with __THROW. */ 
760extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos); 
761/* Set STREAM's position. 
762 
763 This function is a possible cancellation point and therefore not 
764 marked with __THROW. */ 
765extern int fsetpos (FILE *__stream, const fpos_t *__pos); 
766#else 
767# ifdef __REDIRECT 
768extern int __REDIRECT (fgetpos, (FILE *__restrict __stream, 
769 fpos_t *__restrict __pos), fgetpos64); 
770extern int __REDIRECT (fsetpos, 
771 (FILE *__stream, const fpos_t *__pos), fsetpos64); 
772# else 
773# define fgetpos fgetpos64 
774# define fsetpos fsetpos64 
775# endif 
776#endif 
777 
778#ifdef __USE_LARGEFILE64 
779extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence); 
780extern __off64_t ftello64 (FILE *__stream) __wur; 
781extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos); 
782extern int fsetpos64 (FILE *__stream, const fpos64_t *__pos); 
783#endif 
784 
785/* Clear the error and EOF indicators for STREAM. */ 
786extern void clearerr (FILE *__stream) __THROW; 
787/* Return the EOF indicator for STREAM. */ 
788extern int feof (FILE *__stream) __THROW __wur; 
789/* Return the error indicator for STREAM. */ 
790extern int ferror (FILE *__stream) __THROW __wur; 
791 
792#ifdef __USE_MISC 
793/* Faster versions when locking is not required. */ 
794extern void clearerr_unlocked (FILE *__stream) __THROW; 
795extern int feof_unlocked (FILE *__stream) __THROW __wur; 
796extern int ferror_unlocked (FILE *__stream) __THROW __wur; 
797#endif 
798 
799 
800/* Print a message describing the meaning of the value of errno. 
801 
802 This function is a possible cancellation point and therefore not 
803 marked with __THROW. */ 
804extern void perror (const char *__s); 
805 
806 
807#ifdef __USE_POSIX 
808/* Return the system file descriptor for STREAM. */ 
809extern int fileno (FILE *__stream) __THROW __wur; 
810#endif /* Use POSIX. */ 
811 
812#ifdef __USE_MISC 
813/* Faster version when locking is not required. */ 
814extern int fileno_unlocked (FILE *__stream) __THROW __wur; 
815#endif 
816 
817 
818#ifdef __USE_POSIX2 
819/* Close a stream opened by popen and return the status of its child. 
820 
821 This function is a possible cancellation point and therefore not 
822 marked with __THROW. */ 
823extern int pclose (FILE *__stream); 
824 
825/* Create a new stream connected to a pipe running the given command. 
826 
827 This function is a possible cancellation point and therefore not 
828 marked with __THROW. */ 
829extern FILE *popen (const char *__command, const char *__modes) 
830 __attribute_malloc__ __attr_dealloc (pclose, 1) __wur; 
831 
832#endif 
833 
834 
835#ifdef __USE_POSIX 
836/* Return the name of the controlling terminal. */ 
837extern char *ctermid (char *__s) __THROW 
838 __attr_access ((__write_only__, 1)); 
839#endif /* Use POSIX. */ 
840 
841 
842#if (defined __USE_XOPEN && !defined __USE_XOPEN2K) || defined __USE_GNU 
843/* Return the name of the current user. */ 
844extern char *cuserid (char *__s) 
845 __attr_access ((__write_only__, 1)); 
846#endif /* Use X/Open, but not issue 6. */ 
847 
848 
849#ifdef __USE_GNU 
850struct obstack; /* See <obstack.h>. */ 
851 
852/* Write formatted output to an obstack. */ 
853extern int obstack_printf (struct obstack *__restrict __obstack, 
854 const char *__restrict __format, ...) 
855 __THROWNL __attribute__ ((__format__ (__printf__, 2, 3))); 
856extern int obstack_vprintf (struct obstack *__restrict __obstack, 
857 const char *__restrict __format, 
858 __gnuc_va_list __args) 
859 __THROWNL __attribute__ ((__format__ (__printf__, 2, 0))); 
860#endif /* Use GNU. */ 
861 
862 
863#ifdef __USE_POSIX199506 
864/* These are defined in POSIX.1:1996. */ 
865 
866/* Acquire ownership of STREAM. */ 
867extern void flockfile (FILE *__stream) __THROW; 
868 
869/* Try to acquire ownership of STREAM but do not block if it is not 
870 possible. */ 
871extern int ftrylockfile (FILE *__stream) __THROW __wur; 
872 
873/* Relinquish the ownership granted for STREAM. */ 
874extern void funlockfile (FILE *__stream) __THROW; 
875#endif /* POSIX */ 
876 
877#if defined __USE_XOPEN && !defined __USE_XOPEN2K && !defined __USE_GNU 
878/* X/Open Issues 1-5 required getopt to be declared in this 
879 header. It was removed in Issue 6. GNU follows Issue 6. */ 
880# include <bits/getopt_posix.h> 
881#endif 
882 
883/* Slow-path routines used by the optimized inline functions in 
884 bits/stdio.h. */ 
885extern int __uflow (FILE *); 
886extern int __overflow (FILE *, int); 
887 
888/* If we are compiling with optimizing read this file. It contains 
889 several optimizing inline functions and macros. */ 
890#ifdef __USE_EXTERN_INLINES 
891# include <bits/stdio.h> 
892#endif 
893#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function 
894# include <bits/stdio2.h> 
895#endif 
896 
897#include <bits/floatn.h> 
898#if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 
899# include <bits/stdio-ldbl.h> 
900#endif 
901 
902__END_DECLS 
903 
904#endif /* <stdio.h> included. */ 
905