/** * \file libyasm/file.h * \brief YASM file helpers. * * \rcs * $Id: file.h 2157 2008-10-19 07:29:15Z peter $ * \endrcs * * \license * Copyright (C) 2001-2007 Peter Johnson * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * \endlicense */ #ifndef YASM_FILE_H #define YASM_FILE_H #ifndef YASM_LIB_DECL #define YASM_LIB_DECL #endif /** Re2c scanner state. */ typedef struct yasm_scanner { unsigned char *bot; /**< Bottom of scan buffer */ unsigned char *tok; /**< Start of token */ unsigned char *ptr; /**< Scan marker */ unsigned char *cur; /**< Cursor (1 past end of token) */ unsigned char *lim; /**< Limit of good data */ unsigned char *top; /**< Top of scan buffer */ unsigned char *eof; /**< End of file */ } yasm_scanner; /** Initialize scanner state. * \param scanner Re2c scanner state */ YASM_LIB_DECL void yasm_scanner_initialize(yasm_scanner *scanner); /** Frees any memory used by scanner state; does not free state itself. * \param scanner Re2c scanner state */ YASM_LIB_DECL void yasm_scanner_delete(yasm_scanner *scanner); /** Fill a scanner state structure with data coming from an input function. * \param scanner Re2c scanner state * \param cursor Re2c scan cursor * \param input_func Input function to read data; takes buffer and maximum * number of bytes, returns number of bytes read. * \param input_func_data Data to pass as the first parameter to input_func * \return 1 if this was the first time this function was called on this * scanner state, 0 otherwise. */ YASM_LIB_DECL int yasm_fill_helper (yasm_scanner *scanner, unsigned char **cursor, size_t (*input_func) (void *d, unsigned char *buf, size_t max), void *input_func_data); /** Unescape a string with C-style escapes. Handles b, f, n, r, t, and hex * and octal escapes. String is updated in-place. * Edge cases: * - hex escapes: reads as many hex digits as possible, takes last 2 as value. * - oct escapes: takes up to 3 digits 0-9 and scales appropriately, with * warning. * \param str C-style string (updated in place) * \param len length of string (updated with new length) */ YASM_LIB_DECL void yasm_unescape_cstring(unsigned char *str, size_t *len); /** Split a UNIX pathname into head (directory) and tail (base filename) * portions. * \internal * \param path pathname * \param tail (returned) base filename * \return Length of head (directory). */ YASM_LIB_DECL size_t yasm__splitpath_unix(const char *path, /*@out@*/ const char **tail); /** Split a Windows pathname into head (directory) and tail (base filename) * portions. * \internal * \param path pathname * \param tail (returned) base filename * \return Length of head (directory). */ YASM_LIB_DECL size_t yasm__splitpath_win(const char *path, /*@out@*/ const char **tail); /** Split a pathname into head (directory) and tail (base filename) portions. * Unless otherwise defined, defaults to yasm__splitpath_unix(). * \internal * \param path pathname * \param tail (returned) base filename * \return Length of head (directory). */ #ifndef yasm__splitpath # if defined (_WIN32) || defined (WIN32) || defined (__MSDOS__) || \ defined (__DJGPP__) || defined (__OS2__) # define yasm__splitpath(path, tail) yasm__splitpath_win(path, tail) # else # define yasm__splitpath(path, tail) yasm__splitpath_unix(path, tail) # endif #endif /** Get the current working directory. * \internal * \return Current working directory pathname (newly allocated). */ YASM_LIB_DECL /*@only@*/ char *yasm__getcwd(void); /** Convert a relative or absolute pathname into an absolute pathname. * \internal * \param path pathname * \return Absolute version of path (newly allocated). */ YASM_LIB_DECL /*@only@*/ char *yasm__abspath(const char *path); /** Build a UNIX pathname that is equivalent to accessing the "to" pathname * when you're in the directory containing "from". Result is relative if both * from and to are relative. * \internal * \param from from pathname * \param to to pathname * \return Combined path (newly allocated). */ YASM_LIB_DECL char *yasm__combpath_unix(const char *from, const char *to); /** Build a Windows pathname that is equivalent to accessing the "to" pathname * when you're in the directory containing "from". Result is relative if both * from and to are relative. * \internal * \param from from pathname * \param to to pathname * \return Combined path (newly allocated). */ YASM_LIB_DECL char *yasm__combpath_win(const char *from, const char *to); /** Build a pathname that is equivalent to accessing the "to" pathname * when you're in the directory containing "from". Result is relative if both * from and to are relative. * Unless otherwise defined, defaults to yasm__combpath_unix(). * \internal * \param from from pathname * \param to to pathname * \return Combined path (newly allocated). */ #ifndef yasm__combpath # if defined (_WIN32) || defined (WIN32) || defined (__MSDOS__) || \ defined (__DJGPP__) || defined (__OS2__) # define yasm__combpath(from, to) yasm__combpath_win(from, to) # else # define yasm__combpath(from, to) yasm__combpath_unix(from, to) # endif #endif /** Try to find and open an include file, searching through include paths. * First iname is looked for relative to the directory containing "from", then * it's looked for relative to each of the include paths. * * All pathnames may be either absolute or relative; from, oname, and * include paths, if relative, are relative from the current working directory. * * First match wins; the full pathname (newly allocated) to the opened file * is saved into oname, and the fopen'ed FILE * is returned. If not found, * NULL is returned. * * \param iname file to include * \param from file doing the including * \param mode fopen mode string * \param oname full pathname of included file (may be relative). NULL * may be passed if this is unwanted. * \return fopen'ed include file, or NULL if not found. */ YASM_LIB_DECL /*@null@*/ FILE *yasm_fopen_include (const char *iname, const char *from, const char *mode, /*@null@*/ /*@out@*/ /*@only@*/ char **oname); /** Delete any stored include paths added by yasm_add_include_path(). */ YASM_LIB_DECL void yasm_delete_include_paths(void); /** Iterate through include paths. */ YASM_LIB_DECL const char * yasm_get_include_dir(void **iter); /** Add an include path for use by yasm_fopen_include(). * If path is relative, it is treated by yasm_fopen_include() as relative to * the current working directory. * * \param path path to add */ YASM_LIB_DECL void yasm_add_include_path(const char *path); /** Write an 8-bit value to a buffer, incrementing buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 8-bit value */ #define YASM_WRITE_8(ptr, val) \ *((ptr)++) = (unsigned char)((val) & 0xFF) /** Write a 16-bit value to a buffer in little endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_WRITE_16_L(ptr, val) \ do { \ *((ptr)++) = (unsigned char)((val) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 8) & 0xFF); \ } while (0) /** Write a 32-bit value to a buffer in little endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_WRITE_32_L(ptr, val) \ do { \ *((ptr)++) = (unsigned char)((val) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 16) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 24) & 0xFF); \ } while (0) /** Write a 16-bit value to a buffer in big endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_WRITE_16_B(ptr, val) \ do { \ *((ptr)++) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)++) = (unsigned char)((val) & 0xFF); \ } while (0) /** Write a 32-bit value to a buffer in big endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_WRITE_32_B(ptr, val) \ do { \ *((ptr)++) = (unsigned char)(((val) >> 24) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 16) & 0xFF); \ *((ptr)++) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)++) = (unsigned char)((val) & 0xFF); \ } while (0) /** Write an 8-bit value to a buffer. Does not increment buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 8-bit value */ #define YASM_SAVE_8(ptr, val) \ *(ptr) = (unsigned char)((val) & 0xFF) /** Write a 16-bit value to a buffer in little endian. Does not increment * buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_SAVE_16_L(ptr, val) \ do { \ *(ptr) = (unsigned char)((val) & 0xFF); \ *((ptr)+1) = (unsigned char)(((val) >> 8) & 0xFF); \ } while (0) /** Write a 32-bit value to a buffer in little endian. Does not increment * buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_SAVE_32_L(ptr, val) \ do { \ *(ptr) = (unsigned char)((val) & 0xFF); \ *((ptr)+1) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)+2) = (unsigned char)(((val) >> 16) & 0xFF); \ *((ptr)+3) = (unsigned char)(((val) >> 24) & 0xFF); \ } while (0) /** Write a 16-bit value to a buffer in big endian. Does not increment buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_SAVE_16_B(ptr, val) \ do { \ *(ptr) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)+1) = (unsigned char)((val) & 0xFF); \ } while (0) /** Write a 32-bit value to a buffer in big endian. Does not increment buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_SAVE_32_B(ptr, val) \ do { \ *(ptr) = (unsigned char)(((val) >> 24) & 0xFF); \ *((ptr)+1) = (unsigned char)(((val) >> 16) & 0xFF); \ *((ptr)+2) = (unsigned char)(((val) >> 8) & 0xFF); \ *((ptr)+3) = (unsigned char)((val) & 0xFF); \ } while (0) /** Direct-to-file version of YASM_SAVE_16_L(). * \note Using the macro multiple times with a single fwrite() call will * probably be faster than calling this function many times. * \param val 16-bit value * \param f file * \return 1 if the write was successful, 0 if not (just like fwrite()). */ YASM_LIB_DECL size_t yasm_fwrite_16_l(unsigned short val, FILE *f); /** Direct-to-file version of YASM_SAVE_32_L(). * \note Using the macro multiple times with a single fwrite() call will * probably be faster than calling this function many times. * \param val 32-bit value * \param f file * \return 1 if the write was successful, 0 if not (just like fwrite()). */ YASM_LIB_DECL size_t yasm_fwrite_32_l(unsigned long val, FILE *f); /** Direct-to-file version of YASM_SAVE_16_B(). * \note Using the macro multiple times with a single fwrite() call will * probably be faster than calling this function many times. * \param val 16-bit value * \param f file * \return 1 if the write was successful, 0 if not (just like fwrite()). */ YASM_LIB_DECL size_t yasm_fwrite_16_b(unsigned short val, FILE *f); /** Direct-to-file version of YASM_SAVE_32_B(). * \note Using the macro multiple times with a single fwrite() call will * probably be faster than calling this function many times. * \param val 32-bit value * \param f file * \return 1 if the write was successful, 0 if not (just like fwrite()). */ YASM_LIB_DECL size_t yasm_fwrite_32_b(unsigned long val, FILE *f); /** Read an 8-bit value from a buffer, incrementing buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 8-bit value */ #define YASM_READ_8(val, ptr) \ (val) = *((ptr)++) & 0xFF /** Read a 16-bit value from a buffer in little endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_READ_16_L(val, ptr) \ do { \ (val) = *((ptr)++) & 0xFF; \ (val) |= (*((ptr)++) & 0xFF) << 8; \ } while (0) /** Read a 32-bit value from a buffer in little endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_READ_32_L(val, ptr) \ do { \ (val) = *((ptr)++) & 0xFF; \ (val) |= (*((ptr)++) & 0xFF) << 8; \ (val) |= (*((ptr)++) & 0xFF) << 16; \ (val) |= (*((ptr)++) & 0xFF) << 24; \ } while (0) /** Read a 16-bit value from a buffer in big endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_READ_16_B(val, ptr) \ do { \ (val) = (*((ptr)++) & 0xFF) << 8; \ (val) |= *((ptr)++) & 0xFF; \ } while (0) /** Read a 32-bit value from a buffer in big endian, incrementing buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_READ_32_B(val, ptr) \ do { \ (val) = (*((ptr)++) & 0xFF) << 24; \ (val) |= (*((ptr)++) & 0xFF) << 16; \ (val) |= (*((ptr)++) & 0xFF) << 8; \ (val) |= *((ptr)++) & 0xFF; \ } while (0) /** Read an 8-bit value from a buffer. Does not increment buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 8-bit value */ #define YASM_LOAD_8(val, ptr) \ (val) = *(ptr) & 0xFF /** Read a 16-bit value from a buffer in little endian. Does not increment * buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_LOAD_16_L(val, ptr) \ do { \ (val) = *(ptr) & 0xFF; \ (val) |= (*((ptr)+1) & 0xFF) << 8; \ } while (0) /** Read a 32-bit value from a buffer in little endian. Does not increment * buffer pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_LOAD_32_L(val, ptr) \ do { \ (val) = (unsigned long)(*(ptr) & 0xFF); \ (val) |= (unsigned long)((*((ptr)+1) & 0xFF) << 8); \ (val) |= (unsigned long)((*((ptr)+2) & 0xFF) << 16); \ (val) |= (unsigned long)((*((ptr)+3) & 0xFF) << 24); \ } while (0) /** Read a 16-bit value from a buffer in big endian. Does not increment buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 16-bit value */ #define YASM_LOAD_16_B(val, ptr) \ do { \ (val) = (*(ptr) & 0xFF) << 8; \ (val) |= *((ptr)+1) & 0xFF; \ } while (0) /** Read a 32-bit value from a buffer in big endian. Does not increment buffer * pointer. * \note Only works properly if ptr is an (unsigned char *). * \param ptr buffer * \param val 32-bit value */ #define YASM_LOAD_32_B(val, ptr) \ do { \ (val) = (unsigned long)((*(ptr) & 0xFF) << 24); \ (val) |= (unsigned long)((*((ptr)+1) & 0xFF) << 16); \ (val) |= (unsigned long)((*((ptr)+2) & 0xFF) << 8); \ (val) |= (unsigned long)(*((ptr)+3) & 0xFF); \ } while (0) #endif