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