1 /* 2 +----------------------------------------------------------------------+ 3 | PHP Version 7 | 4 +----------------------------------------------------------------------+ 5 | Copyright (c) 1997-2017 The PHP Group | 6 +----------------------------------------------------------------------+ 7 | This source file is subject to version 3.01 of the PHP license, | 8 | that is bundled with this package in the file LICENSE, and is | 9 | available through the world-wide-web at the following url: | 10 | http://www.php.net/license/3_01.txt | 11 | If you did not receive a copy of the PHP license and are unable to | 12 | obtain it through the world-wide-web, please send a note to | 13 | license@php.net so we can mail you a copy immediately. | 14 +----------------------------------------------------------------------+ 15 | Author: Stig Sæther Bakken <ssb@php.net> | 16 | Marcus Boerger <helly@php.net> | 17 +----------------------------------------------------------------------+ 18 */ 19 20 /* $Id$ */ 21 22 /* 23 24 Comparing: sprintf, snprintf, slprintf, spprintf 25 26 sprintf offers the ability to make a lot of failures since it does not know 27 the size of the buffer it uses. Therefore usage of sprintf often 28 results in possible entries for buffer overrun attacks. So please 29 use this version only if you are sure the call is safe. sprintf 30 always terminstes the buffer it writes to. 31 32 snprintf knows the buffers size and will not write behind it. But you will 33 have to use either a static buffer or allocate a dynamic buffer 34 before being able to call the function. In other words you must 35 be sure that you really know the maximum size of the buffer required. 36 A bad thing is having a big maximum while in most cases you would 37 only need a small buffer. If the size of the resulting string is 38 longer or equal to the buffer size than the buffer is not terminated. 39 The function also returns the number of chars not including the 40 terminating \0 that were needed to fully comply to the print request. 41 42 slprintf same as snprintf with the difference that it actually returns the 43 length printed not including the terminating \0. 44 45 spprintf is the dynamical version of snprintf. It allocates the buffer in size 46 as needed and allows a maximum setting as snprintf (turn this feature 47 off by setting max_len to 0). spprintf is a little bit slower than 48 snprintf and offers possible memory leakes if you miss freeing the 49 buffer allocated by the function. Therfore this function should be 50 used where either no maximum is known or the maximum is much bigger 51 than normal size required. spprintf always terminates the buffer. 52 53 Example: 54 55 #define MAX 1024 | #define MAX 1024 | #define MAX 1024 56 char buffer[MAX] | char buffer[MAX] | char *buffer; 57 | | 58 | | // No need to initialize buffer: 59 | | // spprintf ignores value of buffer 60 sprintf(buffer, "test"); | snprintf(buffer, MAX, "test"); | spprintf(&buffer, MAX, "text"); 61 | | if (!buffer) 62 | | return OUT_OF_MEMORY 63 // sprintf always terminates | // manual termination of | // spprintf allays terminates buffer 64 // buffer | // buffer *IS* required | 65 | buffer[MAX-1] = 0; | 66 action_with_buffer(buffer); | action_with_buffer(buffer); | action_with_buffer(buffer); 67 | | efree(buffer); 68 */ 69 70 #ifndef SNPRINTF_H 71 #define SNPRINTF_H 72 73 typedef int bool_int; 74 75 typedef enum { 76 NO = 0, YES = 1 77 } boolean_e; 78 79 80 BEGIN_EXTERN_C() 81 PHPAPI int ap_php_slprintf(char *buf, size_t len, const char *format,...); 82 PHPAPI int ap_php_vslprintf(char *buf, size_t len, const char *format, va_list ap); 83 PHPAPI int ap_php_snprintf(char *, size_t, const char *, ...); 84 PHPAPI int ap_php_vsnprintf(char *, size_t, const char *, va_list ap); 85 PHPAPI int ap_php_vasprintf(char **buf, const char *format, va_list ap); 86 PHPAPI int ap_php_asprintf(char **buf, const char *format, ...); 87 PHPAPI int php_sprintf (char* s, const char* format, ...) PHP_ATTRIBUTE_FORMAT(printf, 2, 3); 88 PHPAPI char * php_gcvt(double value, int ndigit, char dec_point, char exponent, char *buf); 89 PHPAPI char * php_conv_fp(register char format, register double num, 90 boolean_e add_dp, int precision, char dec_point, bool_int * is_negative, char *buf, size_t *len); 91 92 END_EXTERN_C() 93 94 #ifdef slprintf 95 #undef slprintf 96 #endif 97 #define slprintf ap_php_slprintf 98 99 #ifdef vslprintf 100 #undef vslprintf 101 #endif 102 #define vslprintf ap_php_vslprintf 103 104 #ifdef snprintf 105 #undef snprintf 106 #endif 107 #define snprintf ap_php_snprintf 108 109 #ifdef vsnprintf 110 #undef vsnprintf 111 #endif 112 #define vsnprintf ap_php_vsnprintf 113 114 #ifndef HAVE_VASPRINTF 115 #define vasprintf ap_php_vasprintf 116 #endif 117 118 #ifndef HAVE_ASPRINTF 119 #define asprintf ap_php_asprintf 120 #endif 121 122 #ifdef sprintf 123 #undef sprintf 124 #endif 125 #define sprintf php_sprintf 126 127 typedef enum { 128 LM_STD = 0, 129 #if SIZEOF_INTMAX_T 130 LM_INTMAX_T, 131 #endif 132 #if SIZEOF_PTRDIFF_T 133 LM_PTRDIFF_T, 134 #endif 135 #if SIZEOF_LONG_LONG 136 LM_LONG_LONG, 137 #endif 138 LM_SIZE_T, 139 LM_LONG, 140 LM_LONG_DOUBLE, 141 LM_PHP_INT_T 142 } length_modifier_e; 143 144 #ifdef PHP_WIN32 145 # define WIDE_INT __int64 146 #elif SIZEOF_LONG_LONG_INT 147 # define WIDE_INT long long int 148 #elif SIZEOF_LONG_LONG 149 # define WIDE_INT long long 150 #else 151 # define WIDE_INT long 152 #endif 153 typedef WIDE_INT wide_int; 154 typedef unsigned WIDE_INT u_wide_int; 155 156 PHPAPI char * ap_php_conv_10(register wide_int num, register bool_int is_unsigned, 157 register bool_int * is_negative, char *buf_end, register size_t *len); 158 159 PHPAPI char * ap_php_conv_p2(register u_wide_int num, register int nbits, 160 char format, char *buf_end, register size_t *len); 161 162 /* The maximum precision that's allowed for float conversion. Does not include 163 * decimal separator, exponent, sign, terminator. Currently does not affect 164 * the modes e/f, only g/k/H, as those have a different limit enforced at 165 * another level (see NDIG in php_conv_fp()). 166 * Applies to the formatting functions of both spprintf.c and snprintf.c, which 167 * use equally sized buffers of MAX_BUF_SIZE = 512 to hold the result of the 168 * call to php_gcvt(). 169 * This should be reasonably smaller than MAX_BUF_SIZE (I think MAX_BUF_SIZE - 9 170 * should be enough, but let's give some more space) */ 171 #define FORMAT_CONV_MAX_PRECISION 500 172 173 #endif /* SNPRINTF_H */ 174 175 /* 176 * Local variables: 177 * tab-width: 4 178 * c-basic-offset: 4 179 * End: 180 */ 181
