Standard library header <stdio.h>

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Standard Library headers

`<assert.h>`
`<complex.h>`(C99)
`<ctype.h>`
`<errno.h>`
`<fenv.h>`(C99)
`<float.h>`
`<inttypes.h>`(C99)
`<iso646.h>`(C95)
`<limits.h>`
`<locale.h>`
`<math.h>`

`<setjmp.h>`
`<signal.h>`
`<stdalign.h>`(C11*)
`<stdarg.h>`
`<stdatomic.h>`(C11)
`<stdbit.h>`(C23)
`<stdbool.h>`(C99*)
`<stdckdint.h>`(C23)
`<stddef.h>`
`<stdint.h>`(C99)
`<stdio.h>`

`<stdlib.h>`
`<stdmchar.h>`(C29)
`<stdnoreturn.h>`(C11*)
`<string.h>`
`<tgmath.h>`(C99)
`<threads.h>`(C11)
`<time.h>`
`<uchar.h>`(C11)
`<wchar.h>`(C95)
`<wctype.h>`(C95)

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This header is part ofinput/output library, providing generic file operation support and supplies I/O functions that work with narrow characters.

This section is incomplete
Reason: 7.23 Input/output <stdio.h>; copy/share subset ofc/io

[edit]Synopsis

#define __STDC_VERSION_STDIO_H__ 202311L typedef/* see description */FILE;typedef/* see description */size_t;typedef/* see description */FILE;typedef/* see description */fpos_t; #define NULL         /* see description */#define _IOFBF       /* see description */#define _IOLBF       /* see description */#define _IONBF       /* see description */#define BUFSIZ       /* see description */#define EOF          /* see description */#define FOPEN_MAX    /* see description */#define FILENAME_MAX /* see description */#define L_tmpnam     /* see description */#define SEEK_CUR     /* see description */#define SEEK_END     /* see description */#define SEEK_SET     /* see description */#define TMP_MAX      /* see description */ #define stdin        /* see description */#define stdout       /* see description */#define stderr       /* see description */ #define _PRINTF_NAN_LEN_MAX /* see description */ intremove(constchar* filename);intrename(constchar* old,constchar* new);FILE*tmpfile(void);char*tmpnam(char* s);intfclose(FILE* stream);intfflush(FILE* stream);FILE*fopen(constchar*restrict filename,constchar*restrict mode);FILE*freopen(constchar*restrict filename,constchar*restrict mode,FILE*restrict stream);voidsetbuf(FILE*restrict stream,char*restrict buf);intsetvbuf(FILE*restrict stream,char*restrict buf,int mode,size_t size);intprintf(constchar*restrict format, ...);intscanf(constchar*restrict format, ...);intsnprintf(char*restrict s,size_t n,constchar*restrict format, ...);intsprintf(char*restrict s,constchar*restrict format, ...);intsscanf(constchar*restrict s,constchar*restrict format, ...);intvfprintf(FILE*restrict stream,constchar*restrict format, va_list arg);intvfscanf(FILE*restrict stream,constchar*restrict format, va_list arg);intvprintf(constchar*restrict format, va_list arg);intvscanf(constchar*restrict format, va_list arg);intvsnprintf(char*restrict s,size_t n,constchar*restrict format, va_list arg);intvsprintf(char*restrict s,constchar*restrict format, va_list arg);intvsscanf(constchar*restrict s,constchar*restrict format, va_list arg);intfgetc(FILE* stream);char*fgets(char*restrict s,int n,FILE*restrict stream);intfputc(int c,FILE* stream);intfputs(constchar*restrict s,FILE*restrict stream);intgetc(FILE* stream);intgetchar(void);intputc(int c,FILE* stream);intputchar(int c);intputs(constchar* s);intungetc(int c,FILE* stream);size_tfread(void*restrict ptr,size_t size,size_t nmemb,FILE*restrict stream);size_tfwrite(constvoid*restrict ptr,size_t size,size_t nmemb,FILE*restrict stream);intfgetpos(FILE*restrict stream,fpos_t*restrict pos);intfseek(FILE* stream,longint offset,int whence);intfsetpos(FILE* stream,constfpos_t* pos);longintftell(FILE* stream);voidrewind(FILE* stream);voidclearerr(FILE* stream);intfeof(FILE* stream);intferror(FILE* stream);voidperror(constchar* s);intfprintf(FILE*restrict stream,constchar*restrict format, ...);intfscanf(FILE*restrict stream,constchar*restrict format, ...);

Only if the implementation defines__STDC_LIB_EXT1__ and additionally the usercode defines__STDC_WANT_LIB_EXT1__ before any inclusion of<stdio.h>:

#if defined(__STDC_WANT_LIB_EXT1__) #define L_tmpnam_s /* see description */#define TMP_MAX_S  /* see description */ typedef/* see description */ errno_t;typedef/* see description */ rsize_t; errno_t tmpfile_s(FILE*restrict*restrict streamptr);errno_t tmpnam_s(char* s, rsize_t maxsize);errno_t fopen_s(FILE*restrict*restrict streamptr,constchar*restrict filename,constchar*restrict mode);errno_t freopen_s(FILE*restrict*restrict newstreamptr,constchar*restrict filename,constchar*restrict mode,FILE*restrict stream);int fprintf_s(FILE*restrict stream,constchar*restrict format, ...);int fscanf_s(FILE*restrict stream,constchar*restrict format, ...);int printf_s(constchar*restrict format, ...);int scanf_s(constchar*restrict format, ...);int snprintf_s(char*restrict s, rsize_t n,constchar*restrict format, ...);int sprintf_s(char*restrict s, rsize_t n,constchar*restrict format, ...);int sscanf_s(constchar*restrict s,constchar*restrict format, ...);int vfprintf_s(FILE*restrict stream,constchar*restrict format, va_list arg);int vfscanf_s(FILE*restrict stream,constchar*restrict format, va_list arg);int vprintf_s(constchar*restrict format, va_list arg);int vscanf_s(constchar*restrict format, va_list arg);int vsnprintf_s(char*restrict s, rsize_t n,constchar*restrict format, va_list arg);int vsprintf_s(char*restrict s, rsize_t n,constchar*restrict format, va_list arg);int vsscanf_s(constchar*restrict s,constchar*restrict format, va_list arg);char* gets_s(char* s, rsize_t n);#endif