STDIO.H(7) Miscellaneous Information Manual STDIO.H(7)

NAME

stdio.h — standard buffered input/output

SYNOPSIS

#include <stdio.h>

DESCRIPTION

The <stdio.h> header defines the following macro names as positive integral constant expressions:

BUFSIZ: Size of <stdio.h> buffers.
FILENAME_MAX: Maximum size in bytes of the longest filename string that the implementation guarantees can be opened.
FOPEN_MAX: Number of streams which the implementation guarantees can be open simultaneously. The value will be at least eight.
_IOFBF: Input/output fully buffered.
_IOLBF: Input/output line buffered.
_IONBF: Input/output unbuffered.
L_ctermid: Maximum size of character array to hold ctermid () output.
L_cuserid: Maximum size of character array to hold cuserid () output. (LEGACY)
L_tmpnam: Maximum size of character array to hold tmpnam () output.
SEEK_CUR: Seek relative to current position.
SEEK_END: Seek relative to end-of-file.
SEEK_SET: Seek relative to start-of-file.
TMP_MAX: Minimum number of unique filenames generated by tmpnam (). Maximum number of times an application can call tmpnam () reliably. The value of TMP_MAX will be at least 10,000.

The following macro name is defined as a negative integral constant expression:

EOF: End-of-file return value.

The following macro name is defined as a null pointer constant:

NULL: Null pointer.

The following macro name is defined as a string constant:

P_tmpdir: default directory prefix for tempnam ().

The following macro names are defined as expressions of type pointer to FILE:

stderr: Standard error output stream.
stdin: Standard input stream.
stdout: Standard output stream.

The following data types are defined through typedef:

FILE: A structure containing information about a file.
fpos_t: Type containing all information needed to specify uniquely every position within a file.
va_list: As described in <stdarg.h> .
size_t: As described in <stddef.h> .

The following are declared as functions and may also be defined as macros. Function prototypes must be provided for use with an ISO C compiler. void clearerr(FILE *); char *ctermid(char *); char *cuserid(char *);(LEGACY) int fclose(FILE *); FILE *fdopen(int, const char *); int feof(FILE *); int ferror(FILE *); int fflush(FILE *); int fgetc(FILE *); int fgetpos(FILE *, fpos_t *); char *fgets(char *, int, FILE *); int fileno(FILE *); void flockfile(FILE *); FILE *fopen(const char *, const char *); int fprintf(FILE *, const char *, ...); int fputc(int, FILE *); int fputs(const char *, FILE *); size_t fread(void *, size_t, size_t, FILE *); FILE *freopen(const char *, const char *, FILE *); int fscanf(FILE *, const char *, ...); int fseek(FILE *, long int, int); int fseeko(FILE *, off_t, int); int fsetpos(FILE *, const fpos_t *); long int ftell(FILE *); off_t ftello(FILE *); int ftrylockfile(FILE *); void funlockfile(FILE *); size_t fwrite(const void *, size_t, size_t, FILE *); int getc(FILE *); int getchar(void); int getc_unlocked(FILE *); int getchar_unlocked(void); int getopt(int, char * const[], const char); (LEGACY) char *gets(char *); int getw(FILE *); int pclose(FILE *); void perror(const char *); FILE *popen(const char *, const char *); int printf(const char *, ...); int putc(int, FILE *); int putchar(int); int putc_unlocked(int, FILE *); int putchar_unlocked(int); int puts(const char *); int putw(int, FILE *); int remove(const char *); int rename(const char *, const char *); void rewind(FILE *); int scanf(const char *, ...); void setbuf(FILE *, char *); int setvbuf(FILE *, char *, int, size_t); int snprintf(char *, size_t, const char *, ...); int sprintf(char *, const char *, ...); int sscanf(const char *, const char *, int ...); char *tempnam(const char *, const char *); FILE *tmpfile(void); char *tmpnam(char *); int ungetc(int, FILE *); int vfprintf(FILE *, const char *, va_list); int vprintf(const char *, va_list); int vsnprintf(char *, size_t, const char *, va_list); int vsprintf(char *, const char *, va_list);

The following external variables are defined: extern char *optarg; ) extern int opterr; ) extern int optind; ) (LEGACY) extern int optopt; )

Inclusion of the <stdio.h> header may also make visible all symbols from <stddef.h>.

APPLICATION USAGE

None.

FUTURE DIRECTIONS