88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
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/* See COPYING.txt for the full license governing this code. */
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/**
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* \file rwhelper.c
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*
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* Header file with some helper functions for working with SDL_RWops.
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*/
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#include <SDL_rwops.h>
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#ifndef SDL_visualtest_rwhelper_h_
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#define SDL_visualtest_rwhelper_h_
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/** Length of the buffer in SDLVisualTest_RWHelperBuffer */
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#define RWOPS_BUFFER_LEN 256
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Struct that is used as a buffer by the RW helper functions. Should be initialized by calling
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* SDLVisualTest_RWHelperResetBuffer() before being used.
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*/
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typedef struct SDLVisualTest_RWHelperBuffer
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{
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/*! Character buffer that data is read into */
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char buffer[RWOPS_BUFFER_LEN];
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/*! buffer[buffer_pos] is the next character to be read from the buffer */
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int buffer_pos;
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/*! Number of character read into the buffer */
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int buffer_width;
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} SDLVisualTest_RWHelperBuffer;
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/**
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* Resets the buffer pointed to by \c buffer used by some of the helper functions.
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* This function should be called when you're using one of the helper functions
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* with a new SDL_RWops object.
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*/
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void SDLVisualTest_RWHelperResetBuffer(SDLVisualTest_RWHelperBuffer* buffer);
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/**
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* Reads a single character using the SDL_RWops object pointed to by \c rw.
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* This function reads data in blocks and stores them in the buffer pointed to by
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* \c buffer, so other SDL_RWops functions should not be used in conjunction
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* with this function.
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*
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* \return The character that was read.
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*/
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char SDLVisualTest_RWHelperReadChar(SDL_RWops* rw,
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SDLVisualTest_RWHelperBuffer* buffer);
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/**
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* Reads characters using the SDL_RWops object pointed to by \c rw into the
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* character array pointed to by \c str (of size \c size) until either the
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* array is full or a new line is encountered. If \c comment_char is encountered,
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* all characters from that position till the end of the line are ignored. The new line
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* is not included as part of the buffer. Lines with only whitespace and comments
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* are ignored. This function reads data in blocks and stores them in the buffer
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* pointed to by \c buffer, so other SDL_RWops functions should not be used in
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* conjunction with this function.
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*
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* \return pointer to the string on success, NULL on failure or EOF.
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*/
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char* SDLVisualTest_RWHelperReadLine(SDL_RWops* rw, char* str, int size,
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SDLVisualTest_RWHelperBuffer* buffer,
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char comment_char);
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/**
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* Counts the number of lines that are not all whitespace and comments using the
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* SDL_RWops object pointed to by \c rw. \c comment_char indicates the character
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* used for comments. Uses the buffer pointed to by \c buffer to read data in blocks.
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*
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* \return Number of lines on success, -1 on failure.
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*/
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int SDLVisualTest_RWHelperCountNonEmptyLines(SDL_RWops* rw,
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SDLVisualTest_RWHelperBuffer* buffer,
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char comment_char);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#endif /* SDL_visualtest_rwhelper_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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