/* +----------------------------------------------------------------------+ | PHP Version 4 | +----------------------------------------------------------------------+ | Copyright (c) 1997-2007 The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | http://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Author: Stig Sæther Bakken <ssb@php.net> | +----------------------------------------------------------------------+ */ /* $Id: snprintf.h,v 1.18.4.7.2.2 2007/01/01 09:46:50 sebastian Exp $ */ /* Comparing: sprintf, snprintf, spprintf sprintf offers the ability to make a lot of failures since it does not know the size of the buffer it uses. Therefore usage of sprintf often results in possible entries for buffer overrun attacks. So please use this version only if you are sure the call is safe. sprintf allways terminstes the buffer it writes to. snprintf knows the buffers size and will not write behind it. But you will have to use either a static buffer or allocate a dynamic buffer before beeing able to call the function. In other words you must be sure that you really know the maximum size of the buffer required. A bad thing is having a big maximum while in most cases you would only need a small buffer. If the size of the resulting string is longer or equal to the buffer size than the buffer is not terminated. spprintf is the dynamical version of snprintf. It allocates the buffer in size as needed and allows a maximum setting as snprintf (turn this feature off by setting max_len to 0). spprintf is a little bit slower than snprintf and offers possible memory leakes if you miss freeing the buffer allocated by the function. Therfore this function should be used where either no maximum is known or the maximum is much bigger than normal size required. spprintf allways terminates the buffer. Example: #define MAX 1024 | #define MAX 1024 | #define MAX 1024 char buffer[MAX] | char buffer[MAX] | char *buffer; | | | | // No need to initialize buffer: | | // spprintf ignores value of buffer sprintf(buffer, "test"); | snprintf(buffer, MAX, "test"); | spprintf(&buffer, MAX, "text"); | | if (!buffer) | | return OUT_OF_MEMORY // sprintf allways terminates | // manual termination of | // spprintf allays terminates buffer // buffer | // buffer *IS* required | | buffer[MAX-1] = 0; | action_with_buffer(buffer); | action_with_buffer(buffer); | action_with_buffer(buffer); | | efree(buffer); */ #ifndef SNPRINTF_H #define SNPRINTF_H BEGIN_EXTERN_C() PHPAPI int ap_php_snprintf(char *, size_t, const char *, ...) PHP_ATTRIBUTE_FORMAT(printf, 3, 4); PHPAPI int ap_php_vsnprintf(char *, size_t, const char *, va_list ap) PHP_ATTRIBUTE_FORMAT(printf, 3, 0); PHPAPI int php_sprintf (char* s, const char* format, ...) PHP_ATTRIBUTE_FORMAT(printf, 2, 3); END_EXTERN_C() #ifdef snprintf #undef snprintf #endif #define snprintf ap_php_snprintf #ifdef vsnprintf #undef vsnprintf #endif #define vsnprintf ap_php_vsnprintf #ifdef sprintf #undef sprintf #endif #define sprintf php_sprintf typedef enum { NO = 0, YES = 1 } boolean_e; typedef enum { LM_STD = 0, #if SIZEOF_INTMAX_T LM_INTMAX_T, #endif #if SIZEOF_PTRDIFF_T LM_PTRDIFF_T, #endif #if SIZEOF_LONG_LONG LM_LONG_LONG, #endif LM_SIZE_T, LM_LONG, LM_LONG_DOUBLE } length_modifier_e; extern char * ap_php_cvt(double arg, int ndigits, int *decpt, int *sign, int eflag, char *buf); extern char * ap_php_ecvt(double arg, int ndigits, int *decpt, int *sign, char *buf); extern char * ap_php_fcvt(double arg, int ndigits, int *decpt, int *sign, char *buf); extern char * ap_php_gcvt(double number, int ndigit, char *buf, boolean_e altform); #if SIZEOF_LONG_LONG_INT # define WIDE_INT long long int #elif SIZEOF_LONG_LONG # define WIDE_INT long long #elif _WIN64 # define WIDE_INT __int64 #else # define WIDE_INT long #endif typedef WIDE_INT wide_int; typedef unsigned WIDE_INT u_wide_int; typedef int bool_int; extern char * ap_php_conv_10(register wide_int num, register bool_int is_unsigned, register bool_int * is_negative, char *buf_end, register int *len); extern char * ap_php_conv_fp(register char format, register double num, boolean_e add_dp, int precision, bool_int * is_negative, char *buf, int *len); extern char * ap_php_conv_p2(register u_wide_int num, register int nbits, char format, char *buf_end, register int *len); #endif /* SNPRINTF_H */ /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * End: */