caca_file

Section: libcaca (3caca)
Updated: Tue Jan 26 2021
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NAME

caca_file - libcaca file IO

SYNOPSIS

Modules

libcaca importers/exporters from/to various

Functions

__extern caca_file_t * caca_file_open (char const *, const char *)
Open a file for reading or writing.
__extern int caca_file_close (caca_file_t *)
Close a file handle.
__extern uint64_t caca_file_tell (caca_file_t *)
Return the position in a file handle.
__extern size_t caca_file_read (caca_file_t *, void *, size_t)
Read data from a file handle.
__extern size_t caca_file_write (caca_file_t *, const void *, size_t)
Write data to a file handle.
__extern char * caca_file_gets (caca_file_t *, char *, int)
Read a line from a file handle.
__extern int caca_file_eof (caca_file_t *)
Tell whether a file handle reached end of file.

Detailed Description

These functions allow to read and write files in a platform-independent way.

Function Documentation

__extern caca_file_t* caca_file_open (char const * path, const char * mode)

Create a caca file handle for a file. If the file is zipped, it is decompressed on the fly.

If an error occurs, NULL is returned and errno is set accordingly:

•: ENOSTS Function not implemented.
•: EINVAL File not found or permission denied.

Parameters

: path The file path
mode The file open mode

Returns

: A file handle to path.

Referenced by caca_import_canvas_from_file().

__extern int caca_file_close (caca_file_t * fp)

Close and destroy the resources associated with a caca file handle.

This function is a wrapper for fclose() or, if available, gzclose().

Parameters

: fp The file handle

Returns

: The return value of fclose() or gzclose().

Referenced by caca_import_canvas_from_file().

__extern uint64_t caca_file_tell (caca_file_t * fp)

Return the file handle position, in bytes.

Parameters

: fp The file handle

Returns

: The current offset in the file handle.

__extern size_t caca_file_read (caca_file_t * fp, void * ptr, size_t size)

Read data from a file handle and copy them into the given buffer.

Parameters

: fp The file handle
ptr The destination buffer
size The number of bytes to read

Returns

: The number of bytes read

Referenced by caca_import_canvas_from_file().

__extern size_t caca_file_write (caca_file_t * fp, const void * ptr, size_t size)

Write the contents of the given buffer to the file handle.

Parameters

: fp The file handle
ptr The source buffer
size The number of bytes to write

Returns

: The number of bytes written

__extern char* caca_file_gets (caca_file_t * fp, char * s, int size)

Read one line of data from a file handle, up to one less than the given number of bytes. A trailing zero is appended to the data.

Parameters

: fp The file handle
s The destination buffer
size The maximum number of bytes to read

Returns

: The number of bytes read, including the trailing zero

__extern int caca_file_eof (caca_file_t * fp)

Return the end-of-file status of the file handle.

This function is a wrapper for feof() or, if available, gzeof().

Parameters

: fp The file handle

Returns

: 1 if EOF was reached, 0 otherwise

Referenced by caca_import_canvas_from_file().

Author

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