Standard library header <stdio.h>

 

C

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Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

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Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Symbol index

 

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)

 

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

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 */
 
int remove(const char* filename);
int rename(const char* old, const char* new);
FILE* tmpfile(void);
char* tmpnam(char* s);
int fclose(FILE* stream);
int fflush(FILE* stream);
FILE* fopen(const char* restrict filename, const char* restrict mode);
FILE* freopen(const char* restrict filename, const char* restrict mode,
FILE* restrict stream);
void setbuf(FILE* restrict stream, char* restrict buf);
int setvbuf(FILE* restrict stream, char* restrict buf, int mode, size_t size);
int printf(const char* restrict format, ...);
int scanf(const char* restrict format, ...);
int snprintf(char* restrict s, size_t n, const char* restrict format, ...);
int sprintf(char* restrict s, const char* restrict format, ...);
int sscanf(const char* restrict s, const char* restrict format, ...);
int vfprintf(FILE* restrict stream, const char* restrict format, va_list arg);
int vfscanf(FILE* restrict stream, const char* restrict format, va_list arg);
int vprintf(const char* restrict format, va_list arg);
int vscanf(const char* restrict format, va_list arg);
int vsnprintf(char* restrict s, size_t n, const char* restrict format, va_list arg);
int vsprintf(char* restrict s, const char* restrict format, va_list arg);
int vsscanf(const char* restrict s, const char* restrict format, va_list arg);
int fgetc(FILE* stream);
char* fgets(char* restrict s, int n, FILE* restrict stream);
int fputc(int c, FILE* stream);
int fputs(const char* restrict s, FILE* restrict stream);
int getc(FILE* stream);
int getchar(void);
int putc(int c, FILE* stream);
int putchar(int c);
int puts(const char* s);
int ungetc(int c, FILE* stream);
size_t fread(void* restrict ptr, size_t size, size_t nmemb,
FILE* restrict stream);
size_t fwrite(const void* restrict ptr, size_t size, size_t nmemb,
FILE* restrict stream);
int fgetpos(FILE* restrict stream, fpos_t* restrict pos);
int fseek(FILE* stream, long int offset, int whence);
int fsetpos(FILE* stream, const fpos_t* pos);
long int ftell(FILE* stream);
void rewind(FILE* stream);
void clearerr(FILE* stream);
int feof(FILE* stream);
int ferror(FILE* stream);
void perror(const char* s);
int fprintf(FILE* restrict stream, const char* restrict format, ...);
int fscanf(FILE* restrict stream, const char* restrict format, ...);

Only if the implementation defines __STDC_LIB_EXT1__ and additionally the user code 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,
const char* restrict filename, const char* restrict mode);
errno_t freopen_s(FILE* restrict* restrict newstreamptr,
const char* restrict filename, const char* restrict mode,
FILE* restrict stream);
int fprintf_s(FILE* restrict stream, const char* restrict format, ...);
int fscanf_s(FILE* restrict stream, const char* restrict format, ...);
int printf_s(const char* restrict format, ...);
int scanf_s(const char* restrict format, ...);
int snprintf_s(char* restrict s, rsize_t n, const char* restrict format, ...);
int sprintf_s(char* restrict s, rsize_t n, const char* restrict format, ...);
int sscanf_s(const char* restrict s, const char* restrict format, ...);
int vfprintf_s(FILE* restrict stream, const char* restrict format, va_list arg);
int vfscanf_s(FILE* restrict stream, const char* restrict format, va_list arg);
int vprintf_s(const char* restrict format, va_list arg);
int vscanf_s(const char* restrict format, va_list arg);
int vsnprintf_s(char* restrict s, rsize_t n, const char* restrict format, va_list arg);
int vsprintf_s(char* restrict s, rsize_t n, const char* restrict format, va_list arg);
int vsscanf_s(const char* restrict s, const char* restrict format, va_list arg);
char* gets_s(char* s, rsize_t n);
#endif